颗粒粒径对格栅-土界面静、动力直剪特性的影响

发布时间：2018-06-29 03:25

本文选题：筋-土界面 + 颗粒粒径　；参考：《岩土力学》2017年01期

【摘要】：为研究颗粒粒径对格栅-粗粒土界面单调直剪和循环剪切特性的影响,利用大型直剪仪进行了一系列室内大型单调直剪试验、循环直剪试验和循环后单调直剪试验,并将单调直剪试验与循环后单调直剪试验的结果进行了对比分析,研究了循环剪切应力历史对界面直剪强度特性的影响。结果表明:单调直剪试验中,随着粗粒土粒径的增加,界面似黏聚力和内摩擦角增加;循环剪切中界面抗剪强度发生硬化,同一循环位移幅值下颗粒粒径越小,界面在循环剪切过程中的硬化速度越快;遭受循环剪切后界面残余应力比降低,峰值似黏聚力显著增长。
[Abstract]:In order to study the effect of particle size on the monotonic direct shear and cyclic shear characteristics of the interface between grille and coarse grained soil, a series of indoor large scale direct shear tests, cyclic direct shear tests and cyclic monotonic direct shear tests were carried out by using a large direct shear apparatus. The results of the monotone direct shear test and the cyclic direct shear test are compared and analyzed, and the influence of cyclic shear stress history on the interface direct shear strength is studied. The results show that the cohesive force and the angle of internal friction increase with the increase of the particle size of coarse grained soil in the monotone direct shear test, and the shear strength of the interface harms in cyclic shear, and the smaller the particle size is under the same cyclic displacement amplitude. The hardening rate of the interface during cyclic shear is faster, and the ratio of residual stress at the interface decreases after cyclic shear, and the peak cohesive force increases significantly.
【作者单位】：上海大学土木工程系;温州大学建筑与土木工程学院;
【基金】：国家自然科学基金资助项目(No.51478255,No.51678352,No.51622810) 上海市自然科学基金资助项目(No.14ZR1416100)~~
【分类号】：TU411

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