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| Research on Mechanism of Landslide of Nearly Horizontal Soft Rock Slope Caused by Wedge—-shape Cracking Expansionary Force |
| WANG Zi一jiang，WANG Chong一gen，WANG Ke，HU Hui |
| China Railway Eryuan Engineering Group Co．Ltd，Chengdu，Sichuan 610031，China |
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Abstract Research purposes:In the area of nearly horizontal unexpansive soft rock mass，the landslide often happens to harm the engineering and human activities. Combined with the survey for the sliding of D1 K641 cutting slope of the Lanzhou一Chongqing Railway，the research was done on the mechanism of the reason for producing the crack of unexpansive rock mass caused by water and the mechanic mechanism of the deformation destruction of nearly horizontal soft rock slope based on doing the performance tests of soft rock mass. This research is crucial to prevention of the deformation destruction of nearly horizontal soft rock slope.
Research conclusions:(1)If the soft rock mass meets water, the wedge一shape cracking disintegration will happen to the soft rock mass under the effect of the wedge一shape cracking expansionary force and the strength of soft rock mass decreases obviously.(2)The mechanism of the deformation destruction of the nearly horizontal soft rock mass slope is as fellows:When meeting water, the nearly horizontal soft rock mass engenders vertical wedge shape cracking and the crack develops deeply under the effect of the wedge一shape cracking expansionary force. When meeting the special layer，the nearly horizontal soft rock mass produces the shear fracture destruction along the layer to cause the rock mass unstable and moving along the hollow surface to produce landsliding under the comprehensive effects of wedge一shape cracking expansionary force，hydrostatic一pressure，gravity and uplifting pressure and less strength.(3)The wedge一shape cracking expansionary force plays a key role in the course of deformation and destruction of slope.
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Received: 27 April 2012
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2012, Vol. 29 
