| 基于MatDEM的砂土侧限压缩试验离散元模拟研究 |
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| 引用本文： | 秦岩,刘春,张晓宇,邓尚.基于MatDEM的砂土侧限压缩试验离散元模拟研究[J].地质力学学报,2018,24(5):676-681. |
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| 作者姓名： | 秦岩 刘春 张晓宇 邓尚 |
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| 作者单位： | 1.南京大学地球科学与工程学院, 江苏 南京 210023 |
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| 基金项目： | 国家自然科学基金（41761134089）；江苏省自然科学基金青年项目（BK20170393）；青岛海洋科学与技术国家实验室开放基金项目（QNLM2016ORP0110） |
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| 摘 要： | 离散元法基于非连续介质力学理论，尤其适用于砂土等离散介质体的数值模拟研究。利用岩土体离散元模拟软件MatDEM的二次开发功能，研发了砂土侧限压缩试验三维离散元模拟器。对三个不同级配砂土试样进行了侧限压缩试验，并且进行了与之相对应的数值模拟，通过分析对比试验结果与数值模拟结果验证了所开发模拟器的有效性。模拟结果表明:离散元法可以很好地反应砂土压缩过程中的配位数变化；每个模拟样品中，粒径较小的单元受到较大的平均压力，导致平均位移较大；数值计算结果的主要误差是由离散元颗粒自身的泊松比引起的。研究突破了常规土力学研究方法的局限性，为今后岩土工程离散元模拟研究提供了参考。
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| 关 键 词： | 砂土 侧限压缩试验 离散元法 数值模拟 误差分析 |
| 收稿时间： | 2018/6/1 0:00:00 |
| 修稿时间： | 2018/8/15 0:00:00 |
DISCRETE ELEMENT SIMULATION OF SAND CONFINED COMPRESSION TEST BASED ON MatDEM |
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| QIN Yan,LIU Chun,ZHANG Xiaoyu and DENG Shang.DISCRETE ELEMENT SIMULATION OF SAND CONFINED COMPRESSION TEST BASED ON MatDEM[J].Journal of Geomechanics,2018,24(5):676-681. |
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| Authors: | QIN Yan LIU Chun ZHANG Xiaoyu and DENG Shang |
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| Institution: | 1.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, Jiangsu, China2.Nanjing University(Suzhou) High-Tech Institute, Suzhou 215123, Jingsu, China |
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| Abstract: | Discrete element method is suitable for numerical simulation of discrete mesoporous media such as sand,because discrete element method is based on discontinuous medium mechanics theory. A 3D discrete element simulator for sand confined compression test was developed by the discrete element simulation software MatDEM. Confined compression tests for 3 different graded sands were carried out, and the numerical simulation matched with the test was carried out. The validity of the developed simulator was verified by the comparison between the test and numerical simulation results. The results show that DEM can well reflect the change of the coordination number in the compression process of sand; in each sample, the elements with smaller size are subjected to greater average pressure, which leads to a larger average displacement; the main error of numerical simulation was caused by the Poisson''s ratio of the discrete element particle. This study overcomes the limitations of the conventional soil mechanics research methods, and provides a reference for the study of the discrete element simulation of geotechnical engineering in the future. |
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| Keywords: | sand confined compression test DEM numerical simulation error analysis |
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