边坡加固的抗震性能参数分析

Analysis of Seismic Performance Parameters for Slope Reinforcement

摘要:

传统基于瑞典法的边坡加固抗震性能参数分析，通过建立强度参数与临界滑动面对应关系完成推导，由于因荷载过大，边坡建筑物抗震性能降低，准确率不高等问题，提出新的边坡加固抗震性能参数分析方法，对边坡加固的抗震性能参数进行分析，更好地通过加固提高其抗震性能。运用新型边坡加固抗震性能参数分析方法，采用基于极向条分的极限分析上限法和非线性Mohr-Coulomb破坏准则，分析边坡加固措施对边坡抗震性能的影响，通过对比有、无加固措施状态下不同能量功率的运算确定边坡抗震性能，利用MATLAB软件获取边坡加固抗震性能参数的最优解。经实验证明，边坡潜在破坏范围受边坡坡顶受荷和边坡加固情况的作用较大，地震荷载系数及非线性系数越大，土体强度非线性越小，边坡抗震性能受地震荷载的作用也越大。边坡抗滑桩最优抗震支护方位位于X_F/L_x=0.7处，在地震荷载从0上升至0.2的情况下，非线性系数为1.2、1.4、1.6以及2.0时的边坡抗震性能分别下降了40.1%、46.8%、57.5%以及61.5%。新型的抗震性能参数分析方法有效地提高了结果准确率，对边坡加固的抗震性能能达到准确分析。

Abstract:

The relationship between strength parameters and critical sliding surface is established to complete derivation in the analysis of seismic performance parameters of slope reinforcement based on the traditional Swedish method. In this work, a novel method for the analysis of the seismic performance parameters of slope reinforcements is proposed to improve the seismic performance of slope reinforcements. The upper-bound limit analysis method based on polar slice and nonlinear Mohr-Coulomb failure criterion is used to analyze the influence of slope reinforcement measurements on slope seismic performance. Slope seismic behavior is determined through the calculation of different energy powers in the presence and absence of reinforcement measures, and the optimal solution for the seismic performance parameters of slope reinforcement is obtained by using MATLAB software. Experiments prove that the potential failure range of the slope is greatly affected by loading on the top of the slope and the reinforcement of the slope. High seismic load coefficients and nonlinear coefficient are associated with the low nonlinear strength of soil and the intense effect of seismic load on slope seismic performance. The optimal seismic support orientation of slope antislide pile is located at X_F/L_x=0.7. When the seismic load increases from 0 to 0.2 with the nonlinear coefficients of 1.2, 1.4, 1.6, and 2.0, the seismic performance of the slope decreases by 40.1%, 46.8%, 57.5%, and 61.5%, respectively. The new seismic performance parameter analysis method can effectively improve the accuracy of results, and the seismic performance of slope reinforcement can be accurately analyzed.