| 巴东组典型红层软岩单轴压缩试验细观组构特征 |
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| 引用本文： | 肖尊群, 王鑫, 汤东桑, 董琼英, 姜亦男, 杨凯, 曹童童, 邓震. 巴东组典型红层软岩单轴压缩试验细观组构特征[J]. 煤田地质与勘探, 2019, 47(6): 103-114. DOI: 10.3969/j.issn.1001-1986.2019.06.017 |
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| 作者姓名： | 肖尊群 王鑫 汤东桑 董琼英 姜亦男 杨凯 曹童童 邓震 |
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| 作者单位： | 1.1. 武汉工程大学兴发矿业学院，湖北 武汉 430000 |
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| 基金项目： | 国家自然科学基金项目（51804222） |
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| 摘 要： | 红色粉砂质泥岩和泥质粉砂岩是巴东组特殊性岩土的代表，具有遇水易崩解特性。根据岩样单轴压缩试验，基于PFC2D程序，建立中硬岩、软岩单轴压缩试验数值模型；模型选用平行黏结颗粒接触模型。根据应力-应变曲线特征，采用分段定量参数标定法对软岩试样的细观参数进行标定；且通过调整法向和切向黏结强度比值
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| 关 键 词： | 巴东组 粉砂质泥岩 泥质粉砂岩 离散元 黏结强度 配位数 |
| 收稿时间： | 2019-03-07 |
Microscopic fabric characteristics of typical red soft rock in Badong Formation under uniaxial compression test |
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| XIAO Zunqun, WANG Xin, TANG Dongsang, DONG Qiongying, JIANG Yinan, YANG Kai, CAO Tongtong, DENG Zhen. Microscopic fabric characteristics of typical red soft rock in Badong Formation under uniaxial compression test[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(6): 103-114. DOI: 10.3969/j.issn.1001-1986.2019.06.017 |
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| Authors: | XIAO Zunqun WANG Xin TANG Dongsang DONG Qiongying JIANG Yinan YANG Kai CAO Tongtong DENG Zhen |
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| Affiliation: | 1.1. Xingfa School of Mining Engineering, Wuhan Institute of Technology, Wuhan 430000, China |
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| Abstract: | 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(σc/τc) 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. |
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| Keywords: | Badong Formation silty mudstone argillaceous siltstone discrete element bond strength coordination number |
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