Coal Geology & Exploration


Red silty mudstone and argillaceous siltstone are the representatives of special rock and soil in Badong Formation, are easy to disintegrate when encountering water. According to the uniaxial compression test of rock samples, a numerical model of medium and soft rock uniaxial compression test was established based on PFC2D program. With the characteristics of stress-strain curve, subsection quantitative parameter calibration method was used to calibrate the microscopic parameters of soft rock samples. The adjustment method and the ratio of tangential bond strength(σcc) control specimen under uniaxial compression failure mode. The uniaxial compression test of silty mudstone and argillaceous siltstone with different weathering degree under saturated and natural state was simulated. The distribution and evolution of meso-fabric parameters such as normal contact force, tangential contact force, coordination number and porosity were analyzed. The results show that the numerical method can well simulate the uniaxial compression test process of medium hard rock and soft rock. Except for medium weathered silty mudstone, weathering degree and water immersion condition can only affect the size of the contact force of sample particles in the statistical angle range, but cannot affect the distribution form. At the same time, weathering degree and water immersion condition prolonged the loading time of significantly decreased coordination number, which decreased with the increase of the number of cracks. Flooding condition and weathering degree have great influence on the porosity evolution of argillaceous siltstone. The degree of weathering has a great influence on the porosity evolution of silty mudstone, but the condition of flooding has little influence.


Badong Formation, silty mudstone, argillaceous siltstone, discrete element, bond strength, coordination number




[1] 余宏明,胡艳欣,唐辉明. 红色泥岩风化含砾粘土的抗剪强度参数与物理性质相关性研究[J]. 地质科技情报,2002,21(4):93-95. YU Hongming,HU Yanxin,TANG Huiming. Research on the relativity between the strength of red mudstone weathered pebble soil and physical characters[J]. Geological Science and Technology Information,2002,21(4):93-95.

[2] 余宏明,胡艳欣,张纯根. 三峡库区巴东地区紫红色泥岩的崩解特性研究[J]. 地质科技情报,2002,21(4):77-80. YU Hongming,HU Yanxin,ZHANG Chungen. Research on disintegration characters of red mudstone of xirang poin Badong area of the reservior of Three Gorge project[J]. Geological Science and Technology Information,2002,21(4):77-80.

[3] 殷跃平,胡瑞林. 三峡库区巴东组(T2b)紫红色泥岩工程地质特征研究[J]. 工程地质学报,2004,12(2):124-135. YIN Yueping,HU Ruilin. Engineering geological characteristics of purplish-red mudstone of middle tertiary formation at the Three Gorges Reservoir[J]. Journal of Engineering Geology,2004,12(2):124-135.

[4] 柴波,殷坤龙. 三峡库区巴东新城区库岸三叠系巴东组层间软弱带[J]. 工程地质学报,2009,17(6):809-816. CHAI Bo,YIN Kunlong. Interlayer weakness zones in Badong Formation of middle Triassic forming bank slopes of Three Gorges Reservoir in new Badong County[J]. Journal of Engineering Geology,2009,17(6):809-816.

[5] 唐辉明,马淑芝,刘佑荣,等. 三峡工程库区巴东县赵树岭滑坡稳定性与防治对策研究[J]. 地球科学,2002,27(5):621-625. TANG Huiming,MA Shuzhi,L IU Yourong,et al. Stability and control measures of Zhaoshuling landslide Badong County,Three Gorges Reservoir[J]. Earth Science-Journal of China University of Geosciences,2002,27(5):621-625.

[6] 卢海峰,陈从新,沈强,等. 鄂西南巴东组红层边坡夹层成因及特性[J]. 水文地质工程地质,2010,37(1):54-61. LU Haifeng,CHEN Congxin,SHEN Qiang,et al. Genesis and characteristic of weak intercalation existed in the red-bed slope[J]. Hydrogeology & Engineering Geology,2010,37(1):54-61.

[7] 蒋明镜,张鹏,廖兆文. 考虑水软化一化学风化作用的岩石单轴压缩试验离散元模拟[J]. 中国水利水电科学研究院学报,2017,15(2):89-95. JIANG Mingjing,ZHANG Peng,LIAO Zhaowen. DEM numerical simulation of rock under the influence of water softening and chemical weathering and chemical weathering in uniaxial compression test[J]. Journal of China Institute of Water Resources and Hydropower Research,2017,15(2):89-95.

[8] 王培涛,杨天鸿,于庆磊,等. 含层理构造黑云变粒岩单轴压缩试验及数值模拟[J]. 东北大学学报(自然科学版),2015,36(11):1633-1637. WANG Peitao,YANG Tianhong,YU Qinglei,et al. Uniaxial compression test and numerical simulation of stratified biotite granulite[J]. Journal of Northeastern University(Natural Science),2015,36(11):1633-1637.

[9] 李术才,张宁,吕爱钟,等. 单轴拉伸条件下断续节理岩体锚固效应试验研究[J]. 岩石力学与工程学报,2011,30(8):1579-1586. LI Shucai,ZHANG Ning,LYU Aizhong,et al. Experimental study of anchoring effect of discontinuous jointed rock mass under uniaxial tension[J]. Chinese Journal of Rock Mechanics and Engineering,2011,30(8):1579-1586.

[10] 陈卫忠,李术才,朱维申,等. 岩石裂纹扩展的试验与数值分析研究[J]. 岩石力学与工程学报,2003,22(1):18-23. CHEN Weizhong,LI Shucai,ZHU Weishen,et al. Experimental and numerical research on crack propagation in rock under compression[J]. Chinese Journal of Rock Mechanics and Engineering,2003,22(1):18-23.

[11] JIANG M J,KONRAD J M,LEROUEIL S. An efficient technique for generating homogeneous specimens for DEM studies[J]. Computers & Geotechnics,2003,30(7):579-597.

[12] CIANTIA M O,CASTELLANZA R,DIPRISCO C. Experimental study on the water-induced weakening of calcar-enites[J]. Rock Mechanics and Rock Engineering,2014:1-21.

[13] HAZZARD F J,YOUNG P R,MAXWELL S C. Microme-chanical modeling of cracking and failure in brittle rocks[J]. Journal of Geophysical Research Solid Earth,2000,105(B7):16683-16697.

[14] 余华中,阮怀宁,褚卫江. 大理岩脆-延-塑转换特性的细观模拟研究[J]. 岩石力学与工程学报,2013,32(1):55-64. YU Huazhong,RUAN Huaining,CHU Weijiang. Mesoscopic simulation study of brittle-ductile-plastic transition character of marble[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(1):55-64.

[15] 周杰,汪永雄,周元辅. 基于颗粒流的砂岩三轴破裂演化宏-细观机理[J]. 煤炭学报,2017,42(增刊1):76-82. ZHOU Jie,WANG Yongxiong,ZHOU Yuanfu. Macro-micro evolution mechanism on sandstone failure in triaxial compression test based on PFC2D.[J]. Journal of China Coal Society,2017,42(S1):76-82.

[16] 李守巨,李德,于申. 压头作用下岩石破碎过程的细观模拟[J]. 西安科技大学学报,2016,36(6):769-774. LI Shouju,LI De,YU Shen. Meso-simulation for fracturing process of rock specimen under action of indenter[J]. Journal of Xi'an University of Science and Technology,2016,36(6):769-774.



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