| 牵引式滑坡渐进形成历程试验研究 |
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| 引用本文： | 孙立娟,杨涛,成启航,吴丁丁.牵引式滑坡渐进形成历程试验研究[J].西南交通大学学报,2018,53(4):762-771. |
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| 作者姓名： | 孙立娟 杨涛 成启航 吴丁丁 |
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| 作者单位： | 西南交通大学土木工程学院;西南交通大学交通隧道工程教育部重点实验室 |
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| 基金项目： | 国家自然科学基金资助项目51178402国家重点研发计划重点专项资助项目2016YFC0802200 |
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| 摘 要： | 为深入研究牵引式滑坡渐进失稳机理，研发了能够模拟滑坡体分段失稳滑动的试验装置.装置主体由若干渗透盒组成，能够构成各种几何形状的分段式滑面；通过向不同分段组合的渗透盒注水，可使滑带分阶段饱水软化，滑带土抗剪强度降低，引发滑体分级失稳滑动，从而实现牵引式滑坡渐进破坏过程的模拟.共设计12种试验方案，模拟了不同几何特性的滑面和坡面线以及多种坡体材料；从前至后分段软化滑带，形成分级失稳滑块，观测滑坡体变形特征及后缘破裂面形态.研究结果表明:各级失稳滑带分别对应1条主裂缝，滑体性质和坡面形态对滑坡体破坏趋势影响较大，两段线坡面形态的坡体变形最为显著；后缘面破裂倾角一般为陡倾角，其中77.42%的倾角值集中在58°~88°范围内，失稳的第1级滑带越短或坡面形态和滑面形态越陡，后缘面破裂倾角越大.
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| 关 键 词： | 牵引式滑坡 模型试验 分段式滑面 渐进演化过程 影响因素 |
| 收稿时间： | 2017-06-21 |
Experimental Study on Couse of Progressive Formation of Retrogressive Landslide |
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| SUN Lijuan,YANG Tao,CHENG Qihang,WU Dingding.Experimental Study on Couse of Progressive Formation of Retrogressive Landslide[J].Journal of Southwest Jiaotong University,2018,53(4):762-771. |
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| Authors: | SUN Lijuan YANG Tao CHENG Qihang WU Dingding |
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| Abstract: | To study the progressive failure mechanism of retrogressive landslides, a test device was developed to simulate the sectional unstable sliding of landslide mass. The main body of the device was composed of several permeable boxes, and could simulate sectional sliding surfaces with different geometric shapes. The sliding zone could be softened in multiple stages by the injection of water into different permeable boxes. This caused a reduction in the shear strength of the soil in the sliding zone, which led to graded instability sliding of the landslide mass. In this manner, the progressive failure process of the retrogressive landslide could be simulated. Twelve types of test schemes were designed, and sliding surfaces and slope lines of different shapes, as well as various slope materials, were used in the simulations. The sliding zone was softened gradually from the front to the rear, forming unstable sliding sections, and then the deformation characteristics of the landslide and the shapes of the trailing-edge fractures were observed. The results show that the unstable slip section at every level corresponds to one main fracture. The properties of the sliding mass and the shapes of the slope have a significant influence on the progressive failure mechanism of the landslide. The slops in a two-section slope shape the most obvious slope deformation. The inclinations of the trailing edge are generally steep dip angles, and 77.42%of the dip angles are in the rang of 58°-88°. The inclination of the trailing edge increases as the length of the first unstable sliding zone decreases or the slope shape and sliding surface are steeper. |
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