| 高应力下剪切速率对砂土抗剪强度影响研究 |
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| 引用本文： | 周杰,周国庆,赵光思,徐宾宾,李晓俊.高应力下剪切速率对砂土抗剪强度影响研究[J].岩土力学,2010,31(9):2805-2810. |
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| 作者姓名： | 周杰 周国庆 赵光思 徐宾宾 李晓俊 |
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| 作者单位： | 1. 中国矿业大学,深部岩土力学与地下工程国家重点实验室,江苏,徐州221008;中国矿业大学,建筑工程学院,江苏,徐州221008
2. 中国矿业大学,深部岩土力学与地下工程国家重点实验室,江苏,徐州221008 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目，国家自然科学基金重点项目 |
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| 摘 要： | 应用DRS-1型高压直剪仪,进行了16组法向应力水平、5种剪切速率条件下福建标准砂的抗剪强度试验,试验结果表明,高应力下砂土的抗剪强度受法向应力和剪切速率的共同影响。法向应力和剪切速率通过影响颗粒破碎和颗粒重排列程度等试样的细观参数,决定了砂土宏观上抗剪强度的发挥。当法向应力较小时,砂土抗剪强度与剪切速率基本无关;但是当法向应力较大时,较快剪切速率条件下的砂土抗剪强度变小,且其摩尔强度包线出现了"下弯-上扬"循环波动,因此不可以忽略剪切速率对砂土抗剪强度的影响。
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| 关 键 词： | 高应力 砂土 抗剪强度 剪切速率 颗粒破碎 |
| 收稿时间： | 2008-12-29 |
Analysis of influence of shear rate on shear strength of sand under high stress |
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| ZHOU Jie,ZHOU Guo-qing,ZHAO Guang-si,XU Bin-bin,LI Xiao-jun.Analysis of influence of shear rate on shear strength of sand under high stress[J].Rock and Soil Mechanics,2010,31(9):2805-2810. |
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| Authors: | ZHOU Jie ZHOU Guo-qing ZHAO Guang-si XU Bin-bin LI Xiao-jun |
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| Institution: | 1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China; 2. School of Architecture and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China |
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| Abstract: | The direct shear strength tests of Fujian standard sand with 16 normal stress levels and 5 series of shear rate were carried out by using the super-high-pressure direct and residual shear testing system DRS1. The test results indicate that the shear strength of sand is influenced by both normal stress level and shear rate; and it has a close relation with particle crushing degree and particle rearrangement/reorientation state after particle crushing (coordinate number Nc). Shear rate has no influence on shear strength of sand under small normal stress; and the Mohr failure envelops are almost same to each other. But when normal stress is relatively large, the shear strength with faster shear rate become smaller; and the Mohr failure envelops show “deflexibility-rise” fluctuation cycle; so the shear rate should be considered in the strength analysis of sand under high normal stress condition. |
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| Keywords: | high stress level sand shear strength shear rate particle crushing |
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