DEM investigation of weathered rocks using a novel bond contact model  

作　　者：Zhenming Shi Tao Jiang Mingjing Jiang Fang Liu Ning Zhang 

机构地区：[1]Department of Geotechnical Engineering, College of Civil Engineering, Tongji University [2]Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University [3]State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2015年第3期327-336,共10页岩石力学与岩土工程学报（英文版）

基　　金：funded by the National Basic Research Programs of China(Grant Nos.2011CB013504 and 2014CB046901);the National Funds for Distinguished Young Scientists of China(Grant No.51025932);the National Nature Science Foundation of China(Grant No.41372272)

摘　　要：The distinct element method（DEM） incorporated with a novel bond contact model was applied in this paper to shed light on the microscopic physical origin of macroscopic behaviors of weathered rock, and to achieve the changing laws of microscopic parameters from observed decaying properties of rocks during weathering. The changing laws of macroscopic mechanical properties of typical rocks were summarized based on the existing research achievements. Parametric simulations were then conducted to analyze the relationships between macroscopic and microscopic parameters, and to derive the changing laws of microscopic parameters for the DEM model. Equipped with the microscopic weathering laws, a series of DEM simulations of basic laboratory tests on weathered rock samples was performed in comparison with analytical solutions. The results reveal that the relationships between macroscopic and microscopic parameters of rocks against the weathering period can be successfully attained by parametric simulations. In addition, weathering has a significant impact on both stressestrain relationship and failure pattern of rocks.The distinct element method（DEM） incorporated with a novel bond contact model was applied in this paper to shed light on the microscopic physical origin of macroscopic behaviors of weathered rock, and to achieve the changing laws of microscopic parameters from observed decaying properties of rocks during weathering. The changing laws of macroscopic mechanical properties of typical rocks were summarized based on the existing research achievements. Parametric simulations were then conducted to analyze the relationships between macroscopic and microscopic parameters, and to derive the changing laws of microscopic parameters for the DEM model. Equipped with the microscopic weathering laws, a series of DEM simulations of basic laboratory tests on weathered rock samples was performed in comparison with analytical solutions. The results reveal that the relationships between macroscopic and microscopic parameters of rocks against the weathering period can be successfully attained by parametric simulations. In addition, weathering has a significant impact on both stressestrain relationship and failure pattern of rocks.

关 键 词：Distinct element method（DEM） Bond contact model Rock weathering Weathering law Microscopic parameter 

分 类 号：TU45[建筑科学—岩土工程]