| 颗粒形态对砂土抗剪强度影响的试验和离散元数值模拟 |
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| 引用本文： | 朱遥,刘春,刘辉,黄靥欢,秦岩,邓尚.颗粒形态对砂土抗剪强度影响的试验和离散元数值模拟[J].工程地质学报(英文版),2020,28(3):490-499. |
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| 作者姓名： | 朱遥 刘春 刘辉 黄靥欢 秦岩 邓尚 |
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| 作者单位： | ①.南京大学地球科学与工程学院，南京 210046，中国 |
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| 基金项目： | 国家自然科学基金项目41761134089国家自然科学基金项目41977218江苏省自然科学基金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： | 为研究颗粒形态对砂土抗剪强度的影响,制备了5组不同粒径的球形石英砂和颗粒形态不规则的实验室标准砂,并进行一系列的直剪试验;离散元法能有效地模拟砂土的离散性和不均匀性,基于高性能离散元分析软件MatDEM,通过二次开发,建立直剪试验三维模拟器,对直剪试验过程进行了数值模拟,并对比分析了试验和数值模拟结果。数据表明:(1)石英砂试样的自然休止角与其抗剪强度有着正相关性;(2)球形石英砂较实验室标准砂能更快达到峰值强度,但其值相对较低;标准砂存在着一定的黏聚力;(3)在直剪过程中,直剪盒中部颗粒的位移较周围颗粒不同,形成了明显的剪切带,并且球形石英砂试样的剪切带内颗粒的位移更小;(4)砂土直剪试验中配位数与剪应力有着良好的正相关性。本文结果表明,在相同的荷载条件下不规则颗粒形态的石英砂的抗剪强度要明显大于球形石英砂。
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| 关 键 词： | 砂土 颗粒形态 直剪试验 离散元法 数值模拟 |
| 收稿时间： | 2019-07-03 |
EXPERIMENT AND DISCRETE ELEMENT NUMERICAL SIMULATION FOR INFLUENCE OF PARTICLE MORPHOLOGY ON SHEAR STRENGTH OF SAND |
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| ZHU Yao,LIU Chun,LIU Hui,HUANG Yanhuan,QIN Yan,DENG Shang.EXPERIMENT AND DISCRETE ELEMENT NUMERICAL SIMULATION FOR INFLUENCE OF PARTICLE MORPHOLOGY ON SHEAR STRENGTH OF SAND[J].Journal of Engineering Geology,2020,28(3):490-499. |
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| Authors: | ZHU Yao LIU Chun LIU Hui HUANG Yanhuan QIN Yan DENG Shang |
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| Institution: | ①.School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China②.High-Tech Research Institute(Suzhou) of Nanjing University, Suzhou 215123, China |
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| Abstract: | This paper investigates the effect of particle morphology on the shear strength of sand. We prepared five sets of spherical quartz sand and laboratory standard sand with different particle sizes. Based on the high-performance DEM analysis software MatDEM, we established a three-dimensional direct shear test simulator through deeper development. We compared test data with simulated data. The results are summarized as follows. (1)The natural repose angle of quartz sand has a good positive correlation with its shear strength. (2)Spherical quartz sand can reach the peak strength faster than the laboratory standard sand, but its value is relatively low. Standard sand has a certain cohesion. (3)In the direct shearing process, the displacement of the particles in the middle of the shear box is different from that of the surrounding particles, forming a distinct shear band. The displacement of the particles in the shear band of the spherical quartz sand sample is smaller. (4)The coordination number and shear stress have a good positive correlation. The results of this paper show that under the same conditions, the shear strength of quartz sand with irregular particle morphology is significantly greater than that of spherical quartz sand. |
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| Keywords: | Sand Particle morphology Direct shear test DEM Numerical simulation |
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