抗滑桩桩间土体稳定的可靠性分析

Study on the Reliability of Soil Stability Between Anti-slide Piles

岩土参数的变异性对抗滑桩的稳定性有重要影响,可靠性分析是抗滑桩设计的发展方向。基于"土拱效应"建立了抗滑桩桩间土体稳定的极限状态方程,采用Rosenblueth法进行可靠度计算,结合工程实例进行了抗滑桩桩后土体稳定的可靠性分析,并讨论了岩土抗剪强度变化、设桩间距对桩间土体稳定可靠性的影响。研究表明,采用抛物线性的土拱建立桩间土体稳定的极限状态方程更符合实际,桩间土体的稳定性随岩土体抗剪强度的增加而增大,随设桩间距的增大而减小,存在一个合理的设桩间距。

There are important effects of soil parameters variation on the stability of slide pile, re- liability analysis is the development direction of the anti-slide pile design. Based on the ＂ soil arching effect ＂ , the stability limit state equation the soil between anti-slide piles was established, the Rosen- blueth method was adopted to calculate the reliability, combined with engineering example the stability reliability of the soil between anti-sliding piles was analyzed, and the influence of rock and soil shear strength change, pile spacing on the reliability of soil stability between piles were discussed. Research shows that, using the parabolic arch to establish the limit state equation of soil between piles is more practical, with the rock and soil resistance increase the shear strength increases, while it decreases with pile spacing increasing, and there is reasonable pile spacing.