不同剪切速率下格栅–土界面循环剪切及其后直剪特性

doi:10.13722/j.cnki.jrme.2014.1711

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摘要为了研究剪切速率对砂土与土工格栅界面剪切特性的影响，采用室内大型直剪仪对土工格栅加筋砂土试样分别进行不同剪切速率下的单调直剪试验、循环直剪试验，并在循环直剪试验结束后接着对试样进行单调直剪试验，研究了剪切速率对筋土界面剪切应力、剪切体变的影响，对比分析不同剪切速率下单调直剪试验的结果与经受过循环剪切后的单调直剪试验结果的差异。试验表明：剪切速率对单调直剪条件下筋土界面的剪切特性影响不大；循环剪切过程中，低剪切速率和高剪切速率下分别发生循环剪切软化和循环剪切硬化现象；剪切速率对循环剪切后的筋土界面直剪特性影响较明显，受循环剪切后筋土界面的抗剪强度比不受循环剪切作用的要低。

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关键词 ：土力学, 筋土界面, 剪切速率, 循环剪切, 单调直剪

Abstract：In order to investigate the influence of shear rate on cyclic and post-cyclic shear behavior of sand-geogrid interface，a series of large scale direct shear，cyclic shear and post-cyclic direct shear tests were performed. The effect of shear rate on shear stress and volumetric strain at interface was studied. Moreover，comparison was made between the direct shear and post-direct shear test results. The results showed that the shear rate had little effect on shear behavior of interface in direct shear tests. On contrary，the cyclic shear stress softening and hardening were observed in the cases of low shear rate and high shear rate respectively. The interface behavior was significantly affected by the shear rate in cyclic shear tests and the shear strength of interface was impaired by cyclic loading. Overall，the influence of shear rate in post-cyclic direct shear tests was evident.

Key words： soil mechanics soil/geogrid interface shear rate cyclic shear monotonic direct shear

引用本文:

刘飞禹1，王攀1，王军2，蔡袁强2. 不同剪切速率下格栅–土界面循环剪切及其后直剪特性[J]. 岩石力学与工程学报, 2016, 35(2): 387-395.
LIU Feiyu1，WANG Pan1，WANG Jun2，CAI Yuanqiang2. Cyclic and post-cyclic shear behavior of sand-geogrid interface under different shear rates . , 2016, 35(2): 387-395.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1711 或 http://www.rockmech.org/CN/Y2016/V35/I2/387

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