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| Research on the Treatment and Monitoring of Soft Soil Landslide in Piedmont Coal Measure Stratum Slope |
| CHEN Haijun1, WANG Zhimeng1, HE Jianping2, QIU Yongping1 |
1. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, Sichuan 610031, China;
2. Dalian University of Technology, Dalian, Liaoning 116024, China |
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Abstract Research purposes: The slope soft soil of piedmont coal measure strata has the related characteristics of general soft soil, still disadvantages gathering like the accumulation of surface water and groundwater caused by slope topography converge, the composition of soft soil layer, and the inclination of underlying bedrock surface. So the self-stability of slope soft soil is worse than that of conventional sedimentary soft soil. When high-speed railway passes through the soft soil area of piedmont coal measure stratum slope, it is easy to cause slope collapse and landslide. Through a typical case, this paper studies and analyzes the comprehensive treatments of the slope soft soil landslide in the piedmont coal measure strata, and explores how to reduce or even avoid the related diseases.
Research conclusions: (1) After the soil cover sealing layer on the slope surface is damaged, the surface water quickly infiltrates into the slope stratum dominated by the completely weathered layer of carbonaceous shale and doped with more hard debris and block stones, resulting in the water absorption saturation softening of carbon shale components, rapid reduction of strength, and the formation of piedmont slope soft soil. (2) The geological characteristics of the slope soft soil formed by the softening of carbonaceous shale and the inclined bedrock surface are the internal causes of landslide formation; Rainfall recharge to groundwater is the external cause; The external force disturbance such as slope loading and toe unloading is the direct cause of landslide formation. (3) When there are environmental sensitive sources in the upper and lower reaches of the landslide, the design method of anti-sliding by sections for the sensitive sources and subgrade is more effective. (4) Systematic whole process deformation monitoring is necessary and effective. (5) The research results can provide reference for the cause research and control technology of slope soft soil landslide in piedmont coal measure strata.
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Received: 21 January 2022
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2022, Vol. 39 
