Stability Analysis And Comprehensive Treatment Of Highway Slope

With the fast development of domestic investment in capital construction and the western China exploitation in these years, the stability problem of slope in highway is increasing accordingly especially in the construction of various level highway. Actually, during the process of highway construction and running, sliding accidents tend to happen more often and bring about catastrophic result in life and property. Therefore, how to simulate the highway slopes' excavating process, analyze the stability and make out safe and effective defending and harnessing measures is becoming a problem worthy of important theoretical and engineering significance.An in-depth and extensive survey about the stability problem of highway slopes was first carried out in this paper. Based on the collected relative literature at home and abroad, various stability analysis methods and calculation theory of highway slopes were discussed. Then, as the common limit equilibrium methods can't consider the nonlinear stress-strain relation of the rock or soil, the elasto-plastic finite element method was introduced to analyze the slope stability. With the inner stress and deformation distribution and the yielding state determined by the present elasto-plastic finite element method, an intensity-converted method (i.e., using reduced intensive parameters) was provided to calculate the safety coefficient Furthermore, a series of comprehensive treatment techniques were advised to defend the stability and safety of highway slopes. Finally, in order to verify and apply the present methods, two typical slopes located at K19 and K23 of the first class highway in PingXi of Shenzhen were studied by using the two-dimensional elasto-plastic finite element program (i.e., GEOEPL2D) without considering the influence of construction and rock joint. And the adopted key geotechnical mechanics parameters of rock or soil were obtained from site and indoor test data after appropriate optimization by empirical formula. During the calculation, the deformation, stress distribution and yielding state in the excavation process were analyzed respectively. The integral safety coefficient of the slope was obtained by using intensity-converted method and in light of the yielding rate of elements and displacement variation of key parts. The result shows that, the analysis methods and prevention and cure measures for highway slopes are feasible.