王玢佳, 王涛, 孙进忠, 石菊松. 2017: 基于环剪试验的湟水河流域大型泥岩滑坡滑带剪切特征初探. 工程地质学报, 25(1): 123-131. DOI: 10.13544/j.cnki.jeg.2017.01.017
    引用本文: 王玢佳, 王涛, 孙进忠, 石菊松. 2017: 基于环剪试验的湟水河流域大型泥岩滑坡滑带剪切特征初探. 工程地质学报, 25(1): 123-131. DOI: 10.13544/j.cnki.jeg.2017.01.017
    WANG Binjia, WANG Tao, SUN Jinzhong, SHI Jusong. 2017: SHEARING CHARACTERISTIC OF SLIDING ZONE SOIL FROM RING SHEAR TESTS FOR LARGE SCALE MUDSTONE LANDSLIDES IN HUANGSHUI RIVER BASIN. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 123-131. DOI: 10.13544/j.cnki.jeg.2017.01.017
    Citation: WANG Binjia, WANG Tao, SUN Jinzhong, SHI Jusong. 2017: SHEARING CHARACTERISTIC OF SLIDING ZONE SOIL FROM RING SHEAR TESTS FOR LARGE SCALE MUDSTONE LANDSLIDES IN HUANGSHUI RIVER BASIN. JOURNAL OF ENGINEERING GEOLOGY, 25(1): 123-131. DOI: 10.13544/j.cnki.jeg.2017.01.017

    基于环剪试验的湟水河流域大型泥岩滑坡滑带剪切特征初探

    SHEARING CHARACTERISTIC OF SLIDING ZONE SOIL FROM RING SHEAR TESTS FOR LARGE SCALE MUDSTONE LANDSLIDES IN HUANGSHUI RIVER BASIN

    • 摘要: 大型泥岩滑坡是青海湟水河流域最主要的地质灾害类型之一。为了揭示此类滑坡运动过程中的滑带土动态剪切特征,本文以湟水河流域两处典型泥岩滑坡滑带土为例,首先通过基本物理性质测试,判定该泥岩滑带土具有中膨胀性;然后利用环剪试验方法,得到了不同含水率的滑带土在不同剪切速率的环剪作用下的剪切特征曲线。结果显示:剪切过程表现出明显的应变软化特性,试样从峰值应力到残余应力有快速明显的应力降(降幅多介于30%~40%之间);试样的剪切速率和含水率与剪切强度呈反相关关系,残余应力对上述因素的响应小于峰值应力;剪切速率(含水率)变化条件相同时,含水率(剪切速率)越大,剪切应力和剪切强度的变化越大。上述结论为湟水河流域大型泥岩滑坡的成因机理分析和稳定性研究提供了参考。

       

      Abstract: Large mudstone landslides are one of the main geological disasters in Huangshui River Basin in Qinghai Province. In the paper, the sliding zones of two typical large mudstone landslides in the area are taken as examples. Ring shear tests with different shear rates are conducted on the soils. The dynamic shear characteristics of the soils with different moisture contents in the sliding zones are revealed. The test results show that the soils in the sliding zones are expansive mudstone, and have obvious strain softening characteristics. The stress rapidly and significantly dropped from the peak stress to the residual stress (stress drop rang focused on 30%~40%). The shear strength has a negative relation with shear rate and moisture content. The response of the residual stress to these factors is less than the peak stress. The greater the moisture content (shear rate), the greater the change extent of shear stress and shear strength. The findings provide reasonable evidence for mechanism analysis and stability evaluation of landslide deformation in Huangshui River Basin.

       

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