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| Research on failure mode of slope dump on soft layer by model test#br# |
| CHEN Chong1，LV Huayong2，GAO Hainan3，LI Shijun4，WEI Zhen1，CHANG Maomao2，WANG Wei4 |
(1. Department of Engineering Physics，Tsinghua University，Beijing 100084，China；2. School of Resources and Safety Engineering，China University of Mining and Technology(Beijing)，Beijing 100083，China；3. School of Mechanics and Civil Engineering，
China University of Mining and Technology(Beijing)，Beijing 100083，China；4. School of Civil Engineering，
Tsinghua University，Beijing 100084，China) |
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Abstract In order to predict the potential failure mode and the entire process of progressive failure of dump slope，a non-contact measurement system developed for model testing is presented. The image acquisition subsystem collects the high resolution photographs during the test. The measurement and analysis subsystem obtains the surface displacement of model and the time curve of displacement at marked points with the speckle technique and tracking technology. With the non-contact measurement system，a series of model tests studying the bottom friction of slope dump on soft layer were performed. The test results show that the failure of slope dump on soft layer is progressive. The failure begins in the toe of the slope and expands gradually towards the deep part of the slope along the weak layer. A through sliding surface is finally formed in the rear part of the slope，then the entire slope slides. The failure cracks can be divided into two types：dislocation cracks with mainly the dislocation deformation and accompanied by horizontal separation，are mainly distributed in the interior of the slope；tension cracks with mainly horizontal separation and accompanied by the dislocation deformation，are mainly distributed in the rear part of slope.
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2018, Vol. 37 
