基于数值应力场的加固边坡临界滑动场

Critical Slip Field of Stabilized Slopes Based on Numerical Stress Field

传统的极限平衡法广泛用于边坡稳定性,计算出的边坡安全系数在工程界普遍接受。但边坡加固后的受力较为复杂,由于极限平衡法假设条件较多,加上计算加固边坡安全系数的合理性受到质疑,所以较多地采用数值分析方法,但数值分析法不易获取工程意义上的安全系数。为此,利用数值分析法计算加固边坡应力分布,再利用临界滑动场理论搜索基于数值应力的临界滑面和计算最小安全系数。通过两种常用边坡加固方式(锚杆框格梁加固和抗滑桩加固)的分析,说明本方法在加固边坡分析中的优势和适用性。

The conventional limit equilibrium methods are widely used in slope stability, and the computed safety of slopes are generally accepted in engineering. However the numerical methods are gradually accepted, because as the force condition of the stabilized slopes is much complicated and too many assumptions are required in limit equilibrium methods and moreover the rationality of safety factors of stabilized slopes are controversial, but it is not easy to obtain satisfactory safety factors of slopes in engineering meaning. Using numerical method to compute stresses distribution of stabilized slopes in this paper, searching of critical slip surfaces based on numerical stres- ses field and computing minimal safety factors are obtained by using the theory of critical slip field. The results of analysis of the two commonly methods of slopes stabilization such as ground anchoring frames and piles showed the applicability and advantages of the method in analysis of stabilized slopes.