Vehicle Loads, Including Holes In Rock Salt Roadbed Stability Of Meshless Analysis

The mechanics property and stability of the rock-salt is the common problem that is always encountered in the highway base engineering of salt lake area and the mining of salt mine. In the highway of salt lake area, the load is mostly produced by vehicles transporting salt products. The intensity of continuous rock-salt can satisfy the need of engineering only from the angle of mechanics. The particularity of rock-salt is that cavities will be formed when the dissolvable salt dissolve. Some cavities (named as evident cavities) appear on the earth surface. While other cavities(named as blind cavities) hide themselves in the inside of rock-salt and therefore cannot be found by routine inspect. Because the connection of rock-salt crystal is comparatively weak, the roadbed will cave in if the thickness of the salt bed in front of the blind cavities reduced to a certain extent. So the stability of the rock-salt with cavities (especially blind cavities) becomes the key that will determine the stability of the rock-salt roadbed. The rules of the distortion and instability of rock-salt will become the basis for evaluating the stability and reinforcement of the roadbed in salt lake area. Till present, no special research is developed about the stability of rock-salt roadbed with cavities. In this paper, we try to use Element-free Galerkin method(EFGM) to analysis the stability of the rock-salt with cavities.Element-free Galerkin method(EFGM) , is a new numerical method developed recently. It is based on Moving Least Square(MLS) and is not constrained by the connectivity between nodes and elements in the finite element method. Only nodal data are necessary in this method and there is no need to join nodes into elements. Another merit is that high accuracy can be achieved and the post-process is easy.In this paper, we first adequately prove the efficiency of EFGM in solving stress intensity problem.Then, we study the stability of the rock-salt roadbed with cavities as a planar questionrwe calculate the model with single cavity and the model with two cavities respectively.And we get the critical loads for the different depth of the cavities and analysis the influence to the stability of many factors such as the magnitude of the loads, the depth of the cavities, the shape of the cavities, etc..We analysis the stability of the rock-salt roadbed in 3-D model with one spherical cavity. And the stability is distinguished by different rules to which we obtain the corresponding curve for the critical loads.The research result will produce important applied value for evaluating the stability and reinforcement of the roadbed in salt lake area.At the same time, the calculation to the semi-plane plate and the semi-space body with cavities in this paper will give reference to kindred questions.Otherwise. we summarize the experience in the implementation of EFGM and make some attempts in improving the method. All of this will be beneficial to the development of EFGM.