| 黄土-基岩滑坡滑带土特性及其演化过程 |
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| 引用本文： | 吴博,赵法锁,王雷,吴韶艳,贺子光.黄土-基岩滑坡滑带土特性及其演化过程[J].煤田地质与勘探,2018,46(4):129. |
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| 作者姓名： | 吴博 赵法锁 王雷 吴韶艳 贺子光 |
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| 作者单位： | 长安大学地质工程与测绘学院;黄淮学院建筑工程学院 |
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| 基金项目： | 中央高校基本科研业务费专项资金（310826171011）；河南省科技攻关项目（182102310773） |
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| 摘 要： | 滑坡的演化过程伴随着滑带的形成，故滑带土的物理力学特性在一定程度上决定着滑坡的形成机理和活动趋势。选取延安丁家沟滑坡滑带土为研究对象，通过X射线衍射、电镜扫描、室内实验等手段，对其矿物成分、微观结构、物理特性和力学特性进行研究。结果表明:不同部位滑带土的性质差异明显，前缘滑带土的含水率、天然密度、干密度、黏土矿物、界限含水率以及粒径分布分维值均明显高于后部滑带土；前缘滑带土在任一法向应力作用下均表现为应变软化的剪切特性，而后缘滑带土在低法向应力水平下表现为弱应变软化，在高应力水平下表现为应变稳定。通过前后缘滑带土物理力学特性差异，总结出此类滑坡演化阶段为后缘剪切面形成→剪切面扩展→滑带贯通。
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| 关 键 词： | 滑带土 物理力学性质 X射线衍射 直剪试验 演化过程 |
| 收稿时间： | 2018-01-15 |
Physical and mechanical properties of slip zone soil in loess-bedrock landslides and its evolutionary process |
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| Abstract: | The evolution process of landslide is accompanied by the formation of sliding zone, so the physical and mechanical properties of sliding zone soil determine to a certain extent the formation mechanism and activity trend of landslide. The selected sliding zone soil of Dingjiagou landslide in Yan'an as the research object, through X-ray diffraction, electron microscope scanning and the laboratory tests, the physical properties, mineral composition, microstructure and mechanical properties were studied. Results show that the properties of the different parts of the sliding zone are different apparently. The water content, natural density, dry density, clay minerals, boundary moisture content, and fractal dimension of the particle size distribution of the leading edge sliding zone soil are significantly higher than that of the rear sliding zone soil; The shear curve of the leading edge slide soil shows strain softening under vertical stress. The trailing edge slide soil shows weak strain softening under low vertical stress and stable strain under high vertical stress. Based on the differences in physical and mechanical properties between the front and rear edges of the sliding zone, it is concluded that the evolution stages of this type of landslide is formation of the shear plane of the trailing edge→extension of the shear plane→penetration of the sliding zone. |
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