Geomechanics and Engineering最新文献_第4页

Effects of water saturation time on energy dissipation and burst propensity of coal specimens 含水饱和时间对煤样能量耗散和爆裂倾向的影响

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.3.205

Xiaohan Yang, T. Ren, Lihai Tan, A. Remennikov

{"title":"Effects of water saturation time on energy dissipation and burst propensity of coal specimens","authors":"Xiaohan Yang, T. Ren, Lihai Tan, A. Remennikov","doi":"10.12989/GAE.2021.24.3.205","DOIUrl":"https://doi.org/10.12989/GAE.2021.24.3.205","url":null,"abstract":"Water infusion has long been taken as an effective way to eliminate coal burst risk as coal properties can be loosen and soften by water infusion. However, not all industrial trials of water infusion for coal burst prevention have been necessarily effective in all situations as the effectiveness of this method can be affected by water infusion time, coal properties and the parameters of water injection. Hence, some fundamental issues including the effects of water infusion time on burst propensity and energy evolution need to be further discussed. In this paper, four groups of coal specimens with 0 day, 5 days, 10 days, and 15 days water saturation time are tested under uniaxial compression load with the application of AE monitoring. To comprehensively compare the burst behavior of coal specimens under different water saturation time, stress-strain curves, AE counts, fragmentation characteristics and burst propensity of these groups are analyzed. It was found by this research that sufficient water saturation can mitigate the burst behavior of coal samples while insufficient water infusion might cannot reach the burst mitigation aims.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66472248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design charts for consolidation settlement of marine clays using finite strain consolidation theory 用有限应变固结理论设计海相粘土固结沉降图

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.3.295

Sanghyun Jun, Jong-Ho Lee, Byung-Soo Park, H. Kwon

{"title":"Design charts for consolidation settlement of marine clays using finite strain consolidation theory","authors":"Sanghyun Jun, Jong-Ho Lee, Byung-Soo Park, H. Kwon","doi":"10.12989/GAE.2021.24.3.295","DOIUrl":"https://doi.org/10.12989/GAE.2021.24.3.295","url":null,"abstract":"In this study, design charts for estimating consolidation settlement are proposed according to finite strain consolidation theory using a nonlinear constitutive relationship equation. Results of parametric sensitivity analysis shows that the final settlement, initial height, and initial void ratio exerted the greatest effect, and the coefficients of the void ratio–effective-stress. Proposed design charts were analyzed for three regions using a representative constitutive relationship equation that enables major dredged-reclaimed construction sites in Korea. The regional design charts can be calculated accurately for the final settlement because it is applied directly to the numerical analysis results, except for reading errors. A general design chart applicable to all marine clays is proposed through correlation analysis of the main parameters. A final self-weight consolidation settlement with various initial void ratios and initial height conditions should be estimated easily using the general design chart and constitutive relationship. The estimated final settlement using the general design chart is similar to the results of numerical analysis obtained using finite strain consolidation theory. Under an overburden pressure condition, design charts for estimating consolidation settlement are proposed for three regions in Korea.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66472507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Probabilistic tunnel face stability analysis: A comparison between LEM and LAM 隧道工作面稳定性概率分析:LEM与LAM的比较

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.4.399

Q. Pan, Zhiyu Chen, Yimin Wu, D. Dias, P. Oreste

引用次数: 0

Centrifuge modelling of rock-socketed drilled shafts under uplift load 抬升荷载作用下嵌岩钻杆的离心模拟

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.5.431

Sunjin Park, Jae‐Hyun Kim, S. Kim, J. H. Park, K. Kwak, Dong‐Soo Kim

{"title":"Centrifuge modelling of rock-socketed drilled shafts under uplift load","authors":"Sunjin Park, Jae‐Hyun Kim, S. Kim, J. H. Park, K. Kwak, Dong‐Soo Kim","doi":"10.12989/GAE.2021.24.5.431","DOIUrl":"https://doi.org/10.12989/GAE.2021.24.5.431","url":null,"abstract":"Rock-socketed drilled shafts are widely used to transfer the heavy loads from the superstructure especially in mountainous area. Extensive research has been done on the behavior of rock-socketed drilled shafts under compressive load. However, little attention has been paid to uplift behavior of drilled shaft in rock, which govern the overall behavior of the foundation system. In this paper, a series of centrifuge tests have been performed to investigate the uplift response of rock-socketed drilled shafts. The pull-out tests of drilled shafts installed in layered rocks having various strengths were conducted. The load-displacement response, axial load distributions in the shaft and the unit skin friction distribution under pull-out loads were investigated. The effects of the strength of rock socket on the initial stiffness, ultimate capacity and mobilization of friction of the foundation, were also examined. The results indicated that characteristics of rock-socket has a significant influence on the uplift behavior of drilled shaft. Most of the applied uplift load were carried by socketed rock when the drilled shaft was installed in the sand over rock layer, whereas substantial load was carried by both upper and lower rock layers when the drilled shaft was completely socketed into layered rock. The pattern of mobilized shaft friction and point where the maximum unit shaft friction occurred were also found to be affected by the socket condition surrounding the drilled shaft.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66474990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation of geocell reinforced slopes behaviorby considering geocell geometry effect 考虑土工格室几何效应的土工格室加筋边坡性能数值研究

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.6.589

A. Ardakani, A. Namaei

引用次数: 6

Vertical load on a conduit buried under a sloping ground 埋在倾斜地面下的管道的垂直荷载

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.24.6.599

Muhammad Umer Arif Khan, S. Shukla

{"title":"Vertical load on a conduit buried under a sloping ground","authors":"Muhammad Umer Arif Khan, S. Shukla","doi":"10.12989/GAE.2021.24.6.599","DOIUrl":"https://doi.org/10.12989/GAE.2021.24.6.599","url":null,"abstract":"Conduits are commonly installed below the ground for utility conveyance around the world. Vertical load on a buried conduit is an important parameter that needs to be known to ensure its safe design and installation. Consideration of soil arching in load calculations helps achieve a more realistic and efficient design. In the past, considering the arching effect, the design charts have been presented for use by practicing engineers to calculate the vertical load on the conduit buried below the level ground. There are currently no design charts for calculating the vertical load on the conduit buried under a sloping ground. In this paper, an attempt has been made to present the derivation of a generalized analytical expression considering that the soil mass overlying the conduit has a sloping face and the arching phenomenon takes place. The developed generalized expression has been used to present some design charts considering specific values of slope geometry, soil properties and burial depths. Furthermore, analytical results for specific soil parameters have been compared with the results extracted from a commercial software PLAXIS 2D, for a developed numerical model and an independent study.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66475887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Cluster and information entropy analysis of acoustic emission during rock failure process 岩石破坏过程声发射的聚类与信息熵分析

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.25.2.135

Zhenghu Zhang, L. Hu, Tiexin Liu, Hongchun Zheng, Chun’an Tang

{"title":"Cluster and information entropy analysis of acoustic emission during rock failure process","authors":"Zhenghu Zhang, L. Hu, Tiexin Liu, Hongchun Zheng, Chun’an Tang","doi":"10.12989/GAE.2021.25.2.135","DOIUrl":"https://doi.org/10.12989/GAE.2021.25.2.135","url":null,"abstract":"This study provided a new research perspective for processing and analyzing AE data to evaluate rock failure. Cluster method and information entropy theory were introduced to investigate temporal and spatial correlation of acoustic emission (AE) events during the rock failure process. Laboratory experiments of granite subjected to compression were carried out, accompanied by real-time acoustic emission monitoring. The cumulative length and dip angle curves of single links were fitted by different distribution models and distribution functions of link length and directionality were determined. Spatial scale and directionality of AE event distribution, which are characterized by two parameters, i.e., spatial correlation length and spatial correlation directionality, were studied with the normalized applied stress. The entropies of link length and link directionality were also discussed. The results show that the distribution of accumulative link length and directionality obeys Weibull distribution. Spatial correlation length shows an upward trend preceding rock failure, while there are no remarkable upward or downward trends in spatial correlation directionality. There are obvious downward trends in entropies of link length and directionality. This research could enrich mathematical methods for processing AE data and facilitate the early-warning of rock failure-related geological disasters.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66476207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on bearing characteristic of rock mass with different structures: Physical modeling 不同结构岩体承载特性研究:物理模拟

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.25.3.179

Z. Zhao, H. Jing, Xinshuai Shi, Lijun Yang, Q. Yin, Yuan Gao

{"title":"Study on bearing characteristic of rock mass with different structures: Physical modeling","authors":"Z. Zhao, H. Jing, Xinshuai Shi, Lijun Yang, Q. Yin, Yuan Gao","doi":"10.12989/GAE.2021.25.3.179","DOIUrl":"https://doi.org/10.12989/GAE.2021.25.3.179","url":null,"abstract":"In this paper, to study the stability of surrounding rock during roadway excavation in different rock mass structures, the physical model test for roadway excavation process in three types of intact rock mass, layered rock mass and massive rock mass were carried out by using the self-developed two-dimensional simulation testing system of complex underground engineering. Firstly, based on the engineering background of a deep mine in eastern China, the similar materials of the most appropriate ratio in line with the similarity theory were tested, compared and determined. Then, the physical models of four different schemes with 1000 mm (height) x1000 mm (length)x 250 mm (width) were constructed. Finally, the roadway excavation was carried out after applying boundary conditions to the physical model by the simulation testing system. The results indicate that the supporting effect of rockbolts has a great influence on the shallow surrounding rock, and the rock mass structure can affect the overall stability of the surrounding rock. Furthermore, the failure mechanism and bearing capacity of surrounding rock were further discussed from the comparison of stress evolution characteristics, distribution of stress arch, and failure modes in different schemes.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66476406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Ageing effect on compressibility, permeability and shear strength of clayey soils exposed to salt solutions 老化对盐溶液下粘性土压缩性、渗透性和抗剪强度的影响

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.25.3.245

Emel Çakar, Y. Yukselen-Aksoy

{"title":"Ageing effect on compressibility, permeability and shear strength of clayey soils exposed to salt solutions","authors":"Emel Çakar, Y. Yukselen-Aksoy","doi":"10.12989/GAE.2021.25.3.245","DOIUrl":"https://doi.org/10.12989/GAE.2021.25.3.245","url":null,"abstract":"The present study investigated the ageing effect on compressibility, permeability and shear strength behavior of kaolin and bentonite samples in the presence of NaCl and CaCl2 solutions. The compressibility, permeability and shear strength parameters were determined on the 60, 190, and 250 days cured samples. The results have shown that, the kaolin sample becomes more compressible in the presence Ca2+ ions with ageing. Generally, the normalized compression index values of bentonite samples increased at the end of 60 days and 250 days curing time periods. The normalized permeability value of kaolin decreased by ageing in the presence of Na+ ions almost twofold. The permeability values of bentonite increased both in NaCl and CaCl2 solutions during ageing. In the presence of Na+ ions kaolin had higher max. shear stress value than Ca2+ ions. When the max. shear stress values of 0, 60 and 190 days samples were compared, it was seen that NaCl solution had no significant effect on the shear strength of kaolin sample. However, the shear strength of kaolin increased in the CaCl2 solution during ageing. In the presence of Ca2+ ions the max. shear stress value of bentonite was higher. The results of this study have shown that ageing has significant effects on the compressibility, permeability and shear strength of kaolinitic and bentonitic clayey soils.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66476515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Shear behavior of EPS geofoam reinforced with polypropylene fiber 聚丙烯纤维增强EPS土工泡沫塑料的剪切性能

IF 3.2 3区工程技术

Geomechanics and Engineering Pub Date : 2021-01-01 DOI: 10.12989/GAE.2021.25.5.347

M. R. Arvin, Gholam Reza Ghafary, N. Hataf, A. Ghafary

{"title":"Shear behavior of EPS geofoam reinforced with polypropylene fiber","authors":"M. R. Arvin, Gholam Reza Ghafary, N. Hataf, A. Ghafary","doi":"10.12989/GAE.2021.25.5.347","DOIUrl":"https://doi.org/10.12989/GAE.2021.25.5.347","url":null,"abstract":"The EPS geofoam as a lightweight material has been widely used in recent years to boost the performance of geotechnical structures. Both the internal and external stability of the fills made by the EPS blocks should be met. Overlying concrete slabs and thick pavements or applying denser EPS blocks provide internal stability of EPS geofoam lightweight fills by reducing the internal vertical stress within the EPS blocks. As an alternative way, in this study, new composite material is introduced by using the polypropylene fiber to reinforce the EPS geofoam in the factory as an attempt to improve the mechanical properties of the EPS geofoam. The composite material was fabricated in different fiber contents by solidifying the mixture of fiber and geofoam beads using controlled heat and temperature. Then, the behavior of the composite was studied using a series of direct shear tests. The results show that including fiber leads to a rise in the shear strength and a significant decline in the compressibility of the reinforced EPS geofoam. For the geofoam reinforced with 80% fiber content, up to 23.3% increase in the shear strength and 57.6% reduction in the vertical displacement (Δz) were observed in the laboratory. In addition, while the change in the composite's cohesion is largely decreased, the friction angle of the composite shows an increasing trend with fiber content increase. A maximum of 12.6% reduction in the cohesion and 100% increase in the internal friction angle of the reinforced material were observed in the laboratory.","PeriodicalId":12602,"journal":{"name":"Geomechanics and Engineering","volume":null,"pages":null},"PeriodicalIF":3.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66476550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3