Geohazard Mechanics最新文献

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Influence of cyclic dynamic disturbance on damage evolution and zoning effect of coal-rock under local static load constraint 局部静载荷约束下循环动态扰动对煤岩损伤演变和分带效应的影响
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.10.001
Yihong Liu , Hongbao Zhao , Aiwen Wang , Lianpeng Dai , Yue Li , Hongwei Zhang
{"title":"Influence of cyclic dynamic disturbance on damage evolution and zoning effect of coal-rock under local static load constraint","authors":"Yihong Liu ,&nbsp;Hongbao Zhao ,&nbsp;Aiwen Wang ,&nbsp;Lianpeng Dai ,&nbsp;Yue Li ,&nbsp;Hongwei Zhang","doi":"10.1016/j.ghm.2023.10.001","DOIUrl":"10.1016/j.ghm.2023.10.001","url":null,"abstract":"<div><p>In order to obtain the characteristics of the effects of cyclic impact loading on the damage of coal-rock in the presence of a local static load constraint, the evolution of the damage factor and the fracture rate during the process and incremental cyclic impact on raw coal and briquettes has been studied. Experimental results show that the presence of local static load restraint improves the impact resistance of the coal-rock, and the damage factor of the coal-rock shows obvious zoning characteristics. When the coal-rock is in an elastic state, the partition with a larger static load restraint area has stronger impact resistance, when the coal-rock is in a plastic state, the partition with a larger static load restraint area has a weaker impact resistance. Increasing impulsive cyclic impacts have a higher damage efficiency to coal-rock than constant impulsive cyclic impacts. The difference in rock breaking efficiency between the two cyclic impact methods is mainly reflected in the partition with the largest constrained area. The crack propagation on the coal-rock surface is more consistent with the partition characteristics of the damage factor. When the static load constrained zone is in an elastic state, the static load has an inhibitory effect on the crack growth. When the static load confinement zone is in a plastic state, the cracks mainly propagate in the static load confinement zone, and the constrained zone mainly consists of tensile cracks that grow in the vertical direction, while the cracks in the non-constrained zone mainly grow in an oblique direction. Finally, fracture mechanics was applied to analyze the failure type of the sample.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 263-276"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000468/pdfft?md5=71a9030e21d427c425e086088cc19573&pid=1-s2.0-S2949741823000468-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135762222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Monitoring and evaluation of disaster risk caused by linkage failure and instability of residual coal pillar and rock strata in multi-coal seam mining 多煤层开采中残留煤柱和岩层的连接失效和不稳定造成的灾害风险监测与评估
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.11.001
Qing Ma , Xiaoli Liu , Yunliang Tan , Yurui Wang , Ruosong Wang , Enzhi Wang , Xuesheng Liu , Zenghui Zhao , Darui Ren , Weiqiang Xie , Ruipeng Qian , Nan Hu
{"title":"Monitoring and evaluation of disaster risk caused by linkage failure and instability of residual coal pillar and rock strata in multi-coal seam mining","authors":"Qing Ma ,&nbsp;Xiaoli Liu ,&nbsp;Yunliang Tan ,&nbsp;Yurui Wang ,&nbsp;Ruosong Wang ,&nbsp;Enzhi Wang ,&nbsp;Xuesheng Liu ,&nbsp;Zenghui Zhao ,&nbsp;Darui Ren ,&nbsp;Weiqiang Xie ,&nbsp;Ruipeng Qian ,&nbsp;Nan Hu","doi":"10.1016/j.ghm.2023.11.001","DOIUrl":"10.1016/j.ghm.2023.11.001","url":null,"abstract":"<div><p>Comprehensive research methods such as literature research, theoretical analysis, numerical simulations and field monitoring have been used to analyze the disasters and characteristics caused by the linkage failure and instability of the residual coal pillars-rock strata in multi-seam mining. The effective monitoring area and monitoring design method of linkage instability of residual coal pillar-rock strata in multi-seam mining have been identified. The evaluation index and the risk assessment method of disaster risk have been established and the project cases have been applied and validated. The results show that: ①The coal pillar will not only cause disaster in single-seam mining, but also more easily cause disaster in multi-seam mining. The instability of coal pillars can cause not only dynamical disasters such as rock falls and mine earthquakes, but also cause surface subsidence and other disasters. ②When monitoring the linkage instability of residual coal pillar-rock strata, it is not only necessary to consider the monitoring of the apply load body (key block), the transition body (residual coal pillar) and the carrier body (interlayer rock and working face), but also to strengthen the monitoring of the fracture development height (linkage body). ③According to the principles of objectivity, easy access and quantification, combined with investigation, analysis, and production and geological characteristics of this mining area, the main evaluation indexes of the degree of disaster caused by linkage instability of residual coal pillar-rock strata are determined as: microseismic energy, residual coal pillar damage degree, fracture development height. And the evaluation index classification table was also given. ④According to the measured value of the evaluation index, the fuzzy comprehensive evaluation method was used to calculate the disaster risk degree in the studied mine belongs to class III, that is, medium risk level. The corresponding pressure relief technology was adopted on site, which achieved a good control effect, and also verified the accuracy and effectiveness of the risk evaluation results.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 297-307"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000493/pdfft?md5=9b58f20be27a30871fd33af78df04676&pid=1-s2.0-S2949741823000493-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135325672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A numerical simulation study on the evolutionary characteristics of the damage process of karst soil cavity under positive pressure effect 正压力作用下岩溶土洞破坏过程演变特征的数值模拟研究
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.10.002
Yongyao Wei , Zongchun Li , Bo Chen , Hong Yin , Jianxun Xiao , Jinqi Kong
{"title":"A numerical simulation study on the evolutionary characteristics of the damage process of karst soil cavity under positive pressure effect","authors":"Yongyao Wei ,&nbsp;Zongchun Li ,&nbsp;Bo Chen ,&nbsp;Hong Yin ,&nbsp;Jianxun Xiao ,&nbsp;Jinqi Kong","doi":"10.1016/j.ghm.2023.10.002","DOIUrl":"10.1016/j.ghm.2023.10.002","url":null,"abstract":"<div><p>Positive pressure effect is the result of rapid urban development in recent years, which leads to over-exploitation of karst groundwater, coupled with the emergence of extreme weather (such as heavy rainfall, the increase in the duration of heavy rainfall), leading to the sharp rise of karst water level, the gas in the karst cavity can not be discharged in time to form a high positive pressure in the soil cavity and promote the destruction of the soil layer, which then induces a series of phenomena, such as karst subsidence. As a new collapse mechanism, the positive pressure effect causes geological disasters that seriously affect the safety of people's lives and properties in karst regions. In order to study the damage characteristics and evolution characteristics of karst soil cavities under positive pressure effect, this study is based on the ASCII text provided by FLAC itself, and the orthotropic simulation computation compilation program, which realizes the finite element analysis in FLAC3D, and focuses on the inhomogeneous change of soil displacement, redistribution of stresses, and plastic damage of karst soil cavities in different evolution stages under the action of positive pressure, and summarizes the characteristics and laws of stress, strain and damage in plastic zone of karst soil cave at different stages of evolution. The results will play a positive role in further investigating the potential mechanical effects, development mechanism and critical warning conditions during the evolution of covered karst soil caves, and also have important scientific research value in deepening the theory of prevention and control of collapse disasters in covered karst soil caves.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 288-296"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000481/pdfft?md5=411870a40111f6b921cf722aa75b82dc&pid=1-s2.0-S2949741823000481-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136159599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Risk field assessment of longwall working face by the double-sided roof cutting along the gob 双面顶板沿山坡切割长壁工作面的风险现场评估
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.09.004
Dongyin Li , Pengkun Chen , Jinzhao Liu , Shen Wang , Huawei Xu
{"title":"Risk field assessment of longwall working face by the double-sided roof cutting along the gob","authors":"Dongyin Li ,&nbsp;Pengkun Chen ,&nbsp;Jinzhao Liu ,&nbsp;Shen Wang ,&nbsp;Huawei Xu","doi":"10.1016/j.ghm.2023.09.004","DOIUrl":"10.1016/j.ghm.2023.09.004","url":null,"abstract":"<div><p>In order to study the mechanism of the dual side roof cutting technology on the composite disaster of gas and coal spontaneous combustion in goaf, a model for the evolution of porosity and permeability in the dual side roof cutting working face was constructed. The location of the occurrence of the compound disaster of gas explosion and coal spontaneous combustion under the double-sided roof cutting mode was studied, and the sensitivity of the evolution pattern of the compound disaster area to the amount of air supply and gas gush was summarized. The results indicate that the top cutting pressure relief technology significantly reduces the permeability of porous media, and the sensitivity of the goaf on the intake side to airflow disturbances is significantly reduced. As the volume of air supply increases, the distance between the gas explosion risk area and the coal spontaneous combustion risk area gradually decreases, and the probability of composite disaster areas is 0. The increase of air supply and gas emission makes the gas concentration in the middle and deep goaf increase in an exponential function, and the width of the gas explosion risk area increases gradually. When the outflow reaches 40 ​m<sup>3</sup>/min, there is no composite disaster zone, indicating that the rapid increase in outflow inhibits the occurrence of composite disasters.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 277-287"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S294974182300047X/pdfft?md5=d86aaf955f72ffb9679d779774e44741&pid=1-s2.0-S294974182300047X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135809438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stability analysis and grouting treatment of inclined shaft lining structure in water-rich strata: A case study 富水地层中斜井衬砌结构的稳定性分析和灌浆处理:案例研究
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.11.002
Zhaopeng Ren , Cun Zhang , Yongle Wang , Shiyong Lan , Shiqi Liu
{"title":"Stability analysis and grouting treatment of inclined shaft lining structure in water-rich strata: A case study","authors":"Zhaopeng Ren ,&nbsp;Cun Zhang ,&nbsp;Yongle Wang ,&nbsp;Shiyong Lan ,&nbsp;Shiqi Liu","doi":"10.1016/j.ghm.2023.11.002","DOIUrl":"10.1016/j.ghm.2023.11.002","url":null,"abstract":"<div><p>The stability of inclined shaft lining structure (ISLS) in complex water-rich strata is affected by many factors, such as water pressure, joint, soft rock, lining corrosion and so on. The instability of the ISLS will affect the safe and efficient coal mine production. Bathe sed on the geological conditions of the Xiaobaodang coal mine, this paper tested the evolution characteristics of concrete composition in long-term water seepage areas and revealed the influence mechanism of corrosion weakening of shaft lining (SL) in water-rich strata. Meanwhile, transient electromagnetic, ground penetrating radar, and infrared monitoring are used to detect the water-rich zones, and damage zones of surrounding rock and lining water seepage zones, and a three-level safety evaluation model for the instability risk of ISLS is constructed. Water abundance of the surrounding rock, surrounding rock deterioration, and shaft lining seepage were the specific indicators in the model. The main inclined shaft (MIS) in the studied coal mine is divided into three levels: non instability risk zone, potential instability risk zone, and high instability risk zone. According to the evaluation results, comprehensive prevention and control measures of “hydrophobic hole drainage” and “back-lining grouting” are adopted for the water inrush source and the surrounding rock micro-crack water channel. The precise prevention and control of ISLS is realized. The research results also provide a reference for the stability evaluation of ISLS and the accurate prevention and control under similar conditions.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 308-318"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S294974182300050X/pdfft?md5=8f0ff2c66aab6a47a7a22334f1573fe3&pid=1-s2.0-S294974182300050X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135763488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Coal and gas outburst prediction model based on principal component analysis and improved support vector machine 基于主成分分析和改进型支持向量机的煤与瓦斯突出预测模型
Geohazard Mechanics Pub Date : 2023-12-01 DOI: 10.1016/j.ghm.2023.11.003
Chaojun Fan, Xinfeng Lai, Haiou Wen, Lei Yang
{"title":"Coal and gas outburst prediction model based on principal component analysis and improved support vector machine","authors":"Chaojun Fan,&nbsp;Xinfeng Lai,&nbsp;Haiou Wen,&nbsp;Lei Yang","doi":"10.1016/j.ghm.2023.11.003","DOIUrl":"https://doi.org/10.1016/j.ghm.2023.11.003","url":null,"abstract":"<div><p>In order to predict the coal outburst risk quickly and accurately, a PCA-FA-SVM based coal and gas outburst risk prediction model was designed. Principal component analysis (PCA) was used to pre-process the original data samples, extract the principal components of the samples, use firefly algorithm (FA) to improve the support vector machine model, and compare and analyze the prediction results of PCA-FA-SVM model with BP model, FA-SVM model, FA-BP model and SVM model. Accuracy rate, recall rate, Macro-F1 and model prediction time were used as evaluation indexes. The results show that: Principal component analysis improves the prediction efficiency and accuracy of FA-SVM model. The accuracy rate of PCA-FA-SVM model predicting coal and gas outburst risk is 0.962, recall rate is 0.955, Macro-F1 is 0.957, and model prediction time is 0.312s. Compared with other models, The comprehensive performance of PCA-FA-SVM model is better.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 4","pages":"Pages 319-324"},"PeriodicalIF":0.0,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000511/pdfft?md5=0fb77e0793c95100bee9d8a88442af37&pid=1-s2.0-S2949741823000511-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138582237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of a damage constitutive model for water-bearing coal measures sedimentary rock with nonlinear deformation during compaction stage 含水煤系沉积岩压实阶段非线性变形损伤本构模型研究
Geohazard Mechanics Pub Date : 2023-09-01 DOI: 10.1016/j.ghm.2023.09.002
Weinan Wang , Qiangling Yao , Aiwen Wang , Karen A. Hudson-Edwards , Chuangkai Zheng , Lun Yan , Lianpeng Dai , Yihong Liu
{"title":"Study of a damage constitutive model for water-bearing coal measures sedimentary rock with nonlinear deformation during compaction stage","authors":"Weinan Wang ,&nbsp;Qiangling Yao ,&nbsp;Aiwen Wang ,&nbsp;Karen A. Hudson-Edwards ,&nbsp;Chuangkai Zheng ,&nbsp;Lun Yan ,&nbsp;Lianpeng Dai ,&nbsp;Yihong Liu","doi":"10.1016/j.ghm.2023.09.002","DOIUrl":"10.1016/j.ghm.2023.09.002","url":null,"abstract":"<div><p>The problem of repeated immersion-induced fatigue damage in engineering coal measures sedimentary rock, including coal-rock pillars, reservoir bank slopes, and water-rich tunnels at the boundary of coal mine underground reservoirs, has profound implications for their stability, safety, and operation, and can even lead to geological disasters. To address this issue, this paper aims to construct a constitutive model that accurately captures the comprehensive process of deformation and failure in water-bearing coal measures sedimentary rock. It explores the deformation characteristics of these formations and provides a theoretical foundation for numerical simulations of geological disasters induced by water-rock interaction. This study integrates the deformation mechanisms of void and matrix deformation in coal seam sedimentary rocks, while considering the influence of immersion cycles. Subsequently, it formulates a segmented constitutive model to depict the entire process of deformation and failure in cyclically immersed water-bearing coal measures sedimentary rock under uniaxial compression. The proposed model's accuracy and rationality are validated through comparisons with experimental research findings and existing theoretical curves from similar models. The results demonstrate the model's effectiveness in describing the deformation behavior of non-dense water-bearing coal measures sedimentary rock under uniaxial compression or low confining pressure before reaching peak stress, although further refinements may be necessary to precisely capture post-peak deformation characteristics. Model parameters, including the deformation caused by voids (<em>γ</em><sub>0</sub>) between voids, increase exponentially with immersion times, while the elastic modulus (<em>E</em><sub><em>v</em></sub>) of voids and the parameter (<em>F</em><sub>0</sub>) related to the average strength of microelements decrease exponentially. The homogeneity degree (<em>m</em>) exhibits no discernible pattern. These research outcomes provide valuable insights for the stability control of engineering coal measures sedimentary rock under water-rock interaction and the mitigation of related geological disasters.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 3","pages":"Pages 244-254"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000365/pdfft?md5=1845fc9c7de02b25f88b5c8be36133df&pid=1-s2.0-S2949741823000365-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135705754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unloading-slippage mechanism of coal bump in gateroad of longwall 长壁巷道煤堆卸滑机理研究
Geohazard Mechanics Pub Date : 2023-09-01 DOI: 10.1016/j.ghm.2023.06.003
Jun Han , Dongxu Jia , Qianjia Hui , Luyu Cui , Zhijie Zhu , Chen Cao
{"title":"Unloading-slippage mechanism of coal bump in gateroad of longwall","authors":"Jun Han ,&nbsp;Dongxu Jia ,&nbsp;Qianjia Hui ,&nbsp;Luyu Cui ,&nbsp;Zhijie Zhu ,&nbsp;Chen Cao","doi":"10.1016/j.ghm.2023.06.003","DOIUrl":"10.1016/j.ghm.2023.06.003","url":null,"abstract":"<div><p>Coal bump seriously threatens the safe and efficient mining of coal, and the research on the occurrence mechanism of coal bump is of great significance. The roadway coal bump accounts for 86.8% of the total. The occurrence of coal bump in gateroad is summarized. It is considered that hard roof and hard coal are the geological characteristics of coal bump, and the sliding instability of rib coal mass is the failure characteristics of coal bump. Based on the elastic foundation theory, the upward deflection characteristics of the front and lateral roof of the working face under the condition of hard roof are analyzed, and compared with the engineering practice of roof rebounding. Taking the roadway coal mass as the research object, the unloading sliding mechanical model of roof-coal-floor composite structure is established. By analyzing the relationship between horizontal ground stress of coal mass, frictional force of coal-roof and coal-floor and tensile resistance of coal mass, the critical equation of coal bump is established. It is proposed that the vertical pressure of coal seam is reduced due to the upward deflection of the roof, and the coal mass loses its clamping and moves into the roadway after overcoming the friction between roof and floor and the tensile strength of coal mass under the action of horizontal ground stress, that is, the unloading and slippage mechanism of coal bump in hard roof mining roadway. The model reasonably explains the causality of coal bump in hard roof mining roadway. Based on the unloading-slippage model, the principle of influencing factors of coal bump, includes the buried depth, roof strength, roof elastic modulus and roof thickness, coal mass strength and elastic modulus. Finally, two coal bump events, ''8.2'' coal bump in Tangshan coal mine and ''11.11'' coal bump in Hongyang mine are analyzed and the unloading-slippage mechanism are the reasoning of two events.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 3","pages":"Pages 208-217"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S294974182300033X/pdfft?md5=8b6e18a5c56d0f056c71a10734a143f9&pid=1-s2.0-S294974182300033X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75919503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Characterization and impact analysis of freezing and expansion disease of roadbed in seasonal freezing zone: A case of heavy railroads 季节性冻土区路基冻胀病特征及影响分析——以重型铁路为例
Geohazard Mechanics Pub Date : 2023-09-01 DOI: 10.1016/j.ghm.2023.09.003
Pei Li , Yaqian Dong
{"title":"Characterization and impact analysis of freezing and expansion disease of roadbed in seasonal freezing zone: A case of heavy railroads","authors":"Pei Li ,&nbsp;Yaqian Dong","doi":"10.1016/j.ghm.2023.09.003","DOIUrl":"10.1016/j.ghm.2023.09.003","url":null,"abstract":"<div><p>The freezing and expansion diseases of railroad roadbeds are prevalent in areas that experience seasonal freezing. This study aims to investigate the features of the freezing and expansion mechanism of seasonal frozen railroad roadbeds and the effects of the freezing and expansion diseases on the roadbeds. This article presents a study of the Shuo-Huang Heavy Duty Railway. Initially, on-site monitoring tests were conducted to analyze the roadbed temperature, water content and deformations due to freezing. Through these tests, the pattern of development of the roadbed freezing and swelling was understood, and the effect of this on the vibration response of the roadbed was investigated. Subsequently, load-free freezing tests were performed to investigate the freezing and expansion features of the roadbed. Through on-site monitoring, it has been determined that the seasonal freezing layer is approximately 0.5 ​m deep. The depth of the frozen expansion on both sides of the road shows clear differences. The frozen and expansion disease significantly amplifies the vibration acceleration of the roadbed, with a tendency towards low-frequency and high-amplitude vibrations. Through indoor testing, we compared the deformation of frozen specimens and their final freeze and expansion rates at different cold-end temperatures and various initial moisture content levels. We find that the initial moisture content has a greater impact on specimen freezing and expansion. The findings in this paper can be used as a reference for researching and addressing roadbed freezing and expansion problems.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 3","pages":"Pages 218-230"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000377/pdfft?md5=d87cc755df32d513c663a98b064e2c63&pid=1-s2.0-S2949741823000377-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134994747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Simulation of electromagnetic high-frequency wave propagation processes in multilayer geo-structures 多层大地构造中高频电磁波传播过程的模拟
Geohazard Mechanics Pub Date : 2023-09-01 DOI: 10.1016/j.ghm.2023.04.001
A.P. Khmelinin, A.I. Konurin, E.V. Denisova
{"title":"Simulation of electromagnetic high-frequency wave propagation processes in multilayer geo-structures","authors":"A.P. Khmelinin,&nbsp;A.I. Konurin,&nbsp;E.V. Denisova","doi":"10.1016/j.ghm.2023.04.001","DOIUrl":"10.1016/j.ghm.2023.04.001","url":null,"abstract":"<div><p>The paper describes the research findings on georadar detection of hydraulic fractures in hydrocarbon reservoirs. Numerical and physical modeling enables studying effect exerted by the electromagnetic properties of the created fracture fill and by the properties of the enclosing formation on the coefficient of high-frequency EM wave reflection from the interface.</p></div>","PeriodicalId":100580,"journal":{"name":"Geohazard Mechanics","volume":"1 3","pages":"Pages 203-207"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949741823000171/pdfft?md5=1ba1230e037894c433b1f5a11383062f&pid=1-s2.0-S2949741823000171-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88230768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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