A simulating method of the potential sliding surface of slope
LI Ning1，2，GUO Shuangfeng1，YAO Xianchun1
(1. Institute of Geotechnical Engineering，Xi'an University of Technology，Xi'an，Shaanxi 710048，China；2. College of Civil Engineering，Lanzhou Jiaotong University，Lanzhou，Gansu 730070，China)
Abstract：Both the determination and simulation of the sliding surface of slopes are the key problems in the stability analysis and design of slopes. The determination of the sliding surface is affected by many factors. The sliding surface of the heterogeneous rock slope needs to be investigated by the combination of geological and theoretical methods. At present，the commonly used simulation models of the sliding surface are the non-slip surface model，the thin layer solid element model and the interface element model. It was found out that the sliding mechanism for the instability processes of a landslide could not be simulated by the non-slip surface method. In the method of thin-layer solid element，the continuous deformation of rock mass elements is used to simulate the discontinuous deformation of structure surface. As to the joint element of Goodman，it is difficult to obtain the normal stiffness Kn and the tangential stiffness Ks，and the element embedding and overlapping are produced in the finite element analysis. Nevertheless，in the Katona internal interface element or the friction-contacting interface element，the strength parameters of joints or faults can be directly adopted without the need to determine the Kn，Ks parameters. Further more，the state of sliding，opening and closing of the contact surfaces can be well simulated with the friction-contacting interface element. The element type proposed was applied to a typical engineering case in order to verify the effectiveness of the method. The friction-contacting interface element was demonstrated to be reasonable by comparing with the results from field measurements.
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2016, Vol. 35 
