Bulletin of Engineering Geology and the Environment最新文献_第3页

Assessment of geomorphological, hydrometeorological and geological trigger conditions of debris flows in northern Patagonia Andes

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-05 DOI: 10.1007/s10064-024-04004-1

Gonzalo Maragaño-Carmona, Ivo Fustos-Toribio, Pablo Moreno-Yaeger, Elisa Ramirez, Daniel Basualto, Wen Nie, Pierre-Yves Descote, Luis F. Robledo

{"title":"Assessment of geomorphological, hydrometeorological and geological trigger conditions of debris flows in northern Patagonia Andes","authors":"Gonzalo Maragaño-Carmona, Ivo Fustos-Toribio, Pablo Moreno-Yaeger, Elisa Ramirez, Daniel Basualto, Wen Nie, Pierre-Yves Descote, Luis F. Robledo","doi":"10.1007/s10064-024-04004-1","DOIUrl":"10.1007/s10064-024-04004-1","url":null,"abstract":"<div><p>Debris flows represent significant threats in the Northern Andes of Patagonia (NAP). On May 1, 2019, during the winter season, an extreme hydrometeorological event of 122 mm accumulated in 24 h triggered debris flows in the Chaiguaco sector (42.1°S/72.4°W), cutting off different sections of the interregional highway with their deposits, leading southern Patagonia with no connection to the rest of Chile. The Chaiguaco debris flow represents the largest event generated at 1,240 m a.s.l. in an area heavily affected by faults. In this study, we conducted a comprehensive assessment of the factors influencing the generation of debris flows in the area, integrating field and laboratory analyses based on this representative event. The study explores three main aspects. The study explores a comprehensive interconnection of geomorphological, hydrometeorological, geotechnical, lithological, structural and mineralogical analysis, emphasizing the initiation of mass movements that can evolve into debris flows. We conclude that the Chaiguaco event represents a typical case of the NAP where an extreme hydrometeorological event in an environment where multiple factors interact triggers debris flows. We suggest addressing future studies from an interdisciplinary perspective, which can serve as baseline inputs for decision-making entities within the framework of the civil protection system of the NAP.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142778466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Investigation of tensile strength and deformation behaviors of basalt fiber-reinforced loess subjected to dry-wet cycles

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-04 DOI: 10.1007/s10064-024-04028-7

Zhipeng Wu, Jian Xu, Henghui Fan, Liang Li, Guochen Wang, Songhe Wang

{"title":"Investigation of tensile strength and deformation behaviors of basalt fiber-reinforced loess subjected to dry-wet cycles","authors":"Zhipeng Wu, Jian Xu, Henghui Fan, Liang Li, Guochen Wang, Songhe Wang","doi":"10.1007/s10064-024-04028-7","DOIUrl":"10.1007/s10064-024-04028-7","url":null,"abstract":"<div><p>The frequent occurrence of geological disasters in the Loess Plateau is related to the low tensile strength of the loess. Previous studies on fiber-reinforced loess mainly focused on compressive properties, and there have been fewer studies on tensile behaviors, especially when subjected to dry-wet cycles. In this paper, the tensile strength and deformation behaviors of basalt fiber-reinforced loess in the range of 0 to 10 dry-wet cycles were studied by uniaxial tensile test combining digital image correlation (DIC) technology. The results reveal that the unreinforced loess has no visible post-peak curve and brittle fracture occurs, while the reinforced loess has a residual strength and shows distinct ductile failure. The uniaxial tensile strength (UTS) of reinforced loess decreases with dry-wet cycles, but the decay rate decreases. The resistance of reinforced loess to dry-wet action is better than loess, with an optimal fiber content of 0.6%. The variation of failure strain of reinforced loess is consistent with UTS with a linear correlation between the two, indicating that the strength is directly related to its deformation resistance. The maximum axial strain in the surface strain field of reinforced loess shows an increasing trend with dry-wet cycles and a decreasing and then increasing trend with fiber content, which is opposite to UTS and failure strain. Fiber reinforcement improves the plastic properties of loess, and the deformation of reinforced loess is more uniform. This study reveals the deterioration law of reinforced loess under dry-wet cycles, providing theoretical support for engineering construction in loess areas.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Intelligent prediction of tunnel surrounding rock advance classification in high altitude and high seismic intensity area and its engineering application

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-04 DOI: 10.1007/s10064-024-04024-x

Ruijie Zhao, Shaoshuai Shi, Shucai Li, Jie Lu, Yang Xue, Tao Zhang

{"title":"Intelligent prediction of tunnel surrounding rock advance classification in high altitude and high seismic intensity area and its engineering application","authors":"Ruijie Zhao, Shaoshuai Shi, Shucai Li, Jie Lu, Yang Xue, Tao Zhang","doi":"10.1007/s10064-024-04024-x","DOIUrl":"10.1007/s10064-024-04024-x","url":null,"abstract":"<div><p>In order to improve and optimize the advance classification and prediction method of tunnel surrounding rock, a prediction method based on Tunnel Seismic Prediction (TSP) and Probabilistic Neural Network (PNN) is proposed. Based on the characteristics of science, maneuverability and representativeness, several factors that greatly affect rock mass classification are selected as evaluation indices based on analysis of numerous TSP data, establishing an advance classification index system for surrounding rock, and designing the “Advance classification and prediction system for surrounding rock” to predict the classification. Engineering application of Jinpingyan Tunnel of Chenglan Railway in high altitude and high intensity area of China is taken as a case study, and proved that the evaluation indices are easy to obtain and the evaluation results are accurate and reliable, and compared with Back Propagation (BP) neural network prediction results, the results show that PNN has some advantages in predicting the calculation speed of surrounding rock classification, the ability to add samples and the classification accuracy in practical engineering applications. The PNN-TSP method can be further used for other tunnel engineering.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"84 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Blastability evaluation for rock mass: review and new tendency

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-02 DOI: 10.1007/s10064-024-04021-0

Zilong Zhou, Cuigang Chen, Xin Cai, Peiyu Wang

{"title":"Blastability evaluation for rock mass: review and new tendency","authors":"Zilong Zhou, Cuigang Chen, Xin Cai, Peiyu Wang","doi":"10.1007/s10064-024-04021-0","DOIUrl":"10.1007/s10064-024-04021-0","url":null,"abstract":"<div><p>Accurately estimating the blastability of rock mass is crucial for precise blasting design, enhancing blasting efficiency, and minimizing unnecessary damage to the rock mass. Despite the development of various methods for blastability evaluation, none has gained wide acceptance due to the complexity of rock masses. This paper aims to systematically review the development of blastability evaluation research to enhance understanding in this area. Firstly, factors affecting the blastability of rock mass were summarized and classified. Based on this, blastability evaluation indexes were categorized into four classes: characteristic parameters of rock, structural parameters of rock mass, blasting parameters, and external factors. The selection principles of blastability evaluation indexes were discussed. Secondly, the methods of blastability evaluation including single index empirical criterion method, multiple indexes aggregation method, comprehensive evaluation method, and machine learning method, were summarized. The applicability and advantages of each evaluation method were introduced. Finally, trends in blastability evaluation of rock mass were proposed, including the intelligent acquisition of rock mass parameters, three-dimensional blastability evaluation, broadening the scope of evaluation, and widespread application.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Thermally induced degradation of Westerly granite microstructure documented by dynamic elastic properties and pore space and damage characteristics

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-02 DOI: 10.1007/s10064-024-04011-2

Daniela Řimnáčová, Vendula Natherová, Tomáš Lokajíček, Matěj Petružálek, Ali Aminzadeh, Martin Racek, Richard Přikryl

{"title":"Thermally induced degradation of Westerly granite microstructure documented by dynamic elastic properties and pore space and damage characteristics","authors":"Daniela Řimnáčová, Vendula Natherová, Tomáš Lokajíček, Matěj Petružálek, Ali Aminzadeh, Martin Racek, Richard Přikryl","doi":"10.1007/s10064-024-04011-2","DOIUrl":"10.1007/s10064-024-04011-2","url":null,"abstract":"<div><p>Ultrasonic sounding, petrographic image analysis, and mercury intrusion porosimetry was performed on 52 Westerly granite (Rhode Island, USA) specimens exposed to controlled heating from 100 °C to 800 °C. Elastic wave velocities, dynamic elastic moduli, and amplitudes decreased quasilinearly by more than 65% (P-wave), 75% (S-wave), and over 90% (elastic moduli). Damage evaluation by using two crack density parameters proved similar behavior. Direct and indirect evaluation of thermal treatment related microcracks by means of petrographic image analysis and mercury intrusion porosimetry revealed exponential character of porosity evolution, being accelerated above the <span>(alpha -beta)</span> quartz phase transition. Discrepancy between thermal treatment and profoundly non-linear increase in porosity and microcrack density can be satisfactorily explained from direct microscopic observation which revealed formation of crushed/powdered minerals within newly formed microcracks in 650‒800 °C range being related to tension-shearing along grain boundaries of phases with contrasting linear thermal expansion coefficients. This damage phenomenon, resulting in the so-called “clogged” porosity evidently overvalued measured elastic wave velocities. Current results thus underline importance of application of various methods / techniques during examination of changes in rock microfabric from decay processes because none of the methods is capable to cover all important factors alone.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Employing frictional parameters in estimating the Hoek-Brown constant mi for intact rocks

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-12-02 DOI: 10.1007/s10064-024-04013-0

Anastasios Tsikrikis, Vassilis Marinos, Theodosios Papaliangas

{"title":"Employing frictional parameters in estimating the Hoek-Brown constant mi for intact rocks","authors":"Anastasios Tsikrikis, Vassilis Marinos, Theodosios Papaliangas","doi":"10.1007/s10064-024-04013-0","DOIUrl":"10.1007/s10064-024-04013-0","url":null,"abstract":"<div><p>An important parameter of the Hoek-Brown failure criterion for intact rock materials is <i>m</i><sub><i>i</i></sub>, a dimensionless material constant that depends on the frictional characteristics of the component minerals. In this study a laboratory testing program was carried out in order to experimentally study the correlations between <i>m</i><sub><i>i</i></sub> and two frictional parameters: (a) the sliding friction angle which is determined from direct shear tests on pre-fractured rock specimens and (b) the Mohr-Coulomb internal friction angle which is determined from triaxial compression strength tests conducted at low confining stresses. We carried out direct shear tests on rough tension joints of ten fresh, low porosity (< 5%) natural rocks, including two igneous, three sedimentary and five metamorphic under normal stresses ranged from 0 to 2 MPa and determined the sliding friction angle φ<sub><i>nd</i></sub> using peak shear stress and dilation measurements. An independent series of triaxial compression tests was conducted on intact cylindrical specimens of the same rocks at various confining pressures up to 70 MPa and the values of the internal friction angle <i>φ</i><sub><i>i0</i></sub> at low confining stresses were determined as well as the values of <i>m</i><sub><i>i</i></sub>, <i>σ</i><sub><i>ci</i></sub> and the principal stresses at the brittle-ductile transition. Our experimental results show that, within the used range of values of the parameters <i>m</i><sub><i>i</i></sub>, <i>φ</i><sub><i>nd</i></sub> and <i>φ</i><sub><i>i0</i></sub>, <i>m</i><sub><i>i</i></sub> increases linearly with decreasing sliding friction angle and increasing internal friction angle. Both correlations were found to be statistically significant at a significance level of 0.001.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Fault quasi-static and dynamic ruptures in deep coal mining: impacts on working faces

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-30 DOI: 10.1007/s10064-024-04017-w

Yatao Li

{"title":"Fault quasi-static and dynamic ruptures in deep coal mining: impacts on working faces","authors":"Yatao Li","doi":"10.1007/s10064-024-04017-w","DOIUrl":"10.1007/s10064-024-04017-w","url":null,"abstract":"<div><p>This study analyzes static and dynamic ruptures in deep coal mining and their impacts on working faces. Using a 2-D numerical model with PyLith, we evaluate the energy, stress disturbances, and seismic wave effects induced by a nearby reverse fault. By pioneering PyLith in induced seismicity research, we provide critical insights into the interactions between mining operations and geological structures. The model simulates fault slip processes and their effects on the working face, focusing on stress changes, energy concentration, peak particle velocity (PPV), and peak particle acceleration (PPA) under varying conditions of mining-induced seismicity. Static deformation due to fault slip caused significant stress changes on both the ceiling and floor of the working face, with stress values ranging from 0.9 MPa to 39 MPa in σ<sub>xx</sub>, 0.6 MPa to 14.7 MPa in σ<sub>xy</sub>, and 1.1 MPa to 22 MPa in σ<sub>yy</sub>. Energy concentration was observed at the corners of the working face near the fault. Dynamic analysis revealed rupture durations ranging from 250 ms to 670 ms, with rupture velocities decreasing from 1.25 km/s to 0.62 km/s as the characteristic slip distance (<i>D</i><sub>c</sub>) increased. Seismic waves showed that both PPV and PPA decreased with increasing <i>D</i><sub>c</sub>. Our findings highlight the necessity of advanced numerical modeling to predict and manage hazards associated with mining-induced seismic events. Additionally, the study emphasizes the importance of designing robust support systems and implementing safety measures to ensure the stability and safety of mining operations under seismic conditions.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effects of particle breakage on rockslide deposition formations: insights from rigid finite element modelling

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-30 DOI: 10.1007/s10064-024-04023-y

Hui Jiang, Jing-Jing Zhu, Wen-Jie Zhang, Jin-Ting Wang, Yuan-De Zhou, Xiu-Li Du

{"title":"Effects of particle breakage on rockslide deposition formations: insights from rigid finite element modelling","authors":"Hui Jiang, Jing-Jing Zhu, Wen-Jie Zhang, Jin-Ting Wang, Yuan-De Zhou, Xiu-Li Du","doi":"10.1007/s10064-024-04023-y","DOIUrl":"10.1007/s10064-024-04023-y","url":null,"abstract":"<div><p>This paper aims to investigate the influence of particle breakage on the dynamics and deposition of rockslides. A rigid-body finite element formulation incorporating bond beam element is proposed to model rock breakage behaviors. This approach enables simulations of particle fragment rolling, collisions between adjacent pieces, and impacts of pieces with the bedrock. Numerical analyses were conducted considering the variations in volumes, breakage modes, breakage efficiency, and the friction coefficient of bedrock surfaces. Simulation results demonstrate a negative linear correlation between the runout distance and the volume of rock blocks. Incorporating fragmentation effects, this study reveals that the breakage efficiency of maternal rock blocks significantly influences the energy dissipation process and the downslope movement of rockslides. Despite variations in breakage modes leading to distinct deposit configurations, run-out distances remain basically consistent. Analysis of block contributions from various source locations indicates that the longitudinal spreading of the deposit primarily depends on blocks distributed on the periphery of the rock mass.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Evaluation of surrounding rock stability by optimizing Hoek-Brown criterion parameters under blasting loads

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-30 DOI: 10.1007/s10064-024-04007-y

Xiaokun Xie, Shaoshuai Shi, Jie Hu, Weidong Guo, Ruijie Zhao

{"title":"Evaluation of surrounding rock stability by optimizing Hoek-Brown criterion parameters under blasting loads","authors":"Xiaokun Xie, Shaoshuai Shi, Jie Hu, Weidong Guo, Ruijie Zhao","doi":"10.1007/s10064-024-04007-y","DOIUrl":"10.1007/s10064-024-04007-y","url":null,"abstract":"<div><p>Dynamic loads due to blasting will affect the mechanical properties of rock masses and form an excavation damage zone (EDZ). The rock mass properties within the EDZ are obtained by the geological strength index (GSI) and disturbance factor (D) in the Hoek-Brown criterion. In order to avoid the subjectivity of GSI evaluation, a stochastic-deterministic 3D discrete fracture network (DFN) is constructed to quantify the GSI. The D value is considered to be a value that varies with depth within the EDZ, rather than a fixed value. Quantitative blasting vibration data is used to determine the disturbance factor rather than qualitatively estimated values. When the disturbance factor decreases linearly within the EDZ, the mechanical properties of the rock mass increase linearly to the undamaged value. Numerical simulation is used to analyze the influence of linear decrease of the rock mass properties on the stability evaluation of the tunnel. The results show that different rock mass parameters have a great influence on tunnel convergence and settlement values. The method described in this paper helps to evaluate the stability of surrounding rock more objectively and accurately.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142753924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Effects of fine content on the mechanical properties and breakage behavior of gap-graded coral sand 细粒含量对间隙级配珊瑚砂机械性能和破损行为的影响

IF 3.7 2区工程技术

Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-29 DOI: 10.1007/s10064-024-04016-x

Jigang Jiang, Yang Yang, Wuwei Mao

{"title":"Effects of fine content on the mechanical properties and breakage behavior of gap-graded coral sand","authors":"Jigang Jiang, Yang Yang, Wuwei Mao","doi":"10.1007/s10064-024-04016-x","DOIUrl":"10.1007/s10064-024-04016-x","url":null,"abstract":"<div><p>Hydraulically filled coral sand foundations are susceptible to various challenges within intricate marine environment. The friability of coral sand results in the production of large amounts of sub-graded fine particles under external stress. Meanwhile, the continual influence of oceanic forces leads to a gradual erosion of these fine particles from soil. The interaction between these two long-term effects plays a crucial role in particle breakage and soil mechanics of coral sand. To address this issue, consolidated drained triaxial tests and sieving analysis were conducted on the gap-graded coral sand with various fine contents. Three unique test methodologies are devised to alter the fine content, including hydraulic scouring, particle removal and particle replacement. The experimental results revealed that a specific amount of fine particle loss can significantly deteriorate the mechanical properties of dense coral sand. By replacing coarse particles with fine particles, larger strength parameters and less dilation were observed, yet there existed a critical threshold of 60% fine content, beyond which further substitution did not yield additional improvement in soil strength. Particle crushing was primarily concentrated in the middle layer of the specimen, influenced by the development of the shear band. Furthermore, the amount of newly generated finer particles exhibited a positive correlation with the increase in fine content in the initial gap-graded soil. These findings could enhance the understanding of the role that fines plays in determining the mechanical characteristics and particle breakage behavior of coral sand, and thus aid in more accurate assessments and designs of engineering applications involving coral sand.</p></div>","PeriodicalId":500,"journal":{"name":"Bulletin of Engineering Geology and the Environment","volume":"83 12","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142737258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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