堆积层滑坡防治工程中抗滑桩合理桩间距探讨

A Study of Suitable Anti-Sliding Piles Spacing in the Project of Preventing and Controlling Colluvial Landslide

土拱效应是安全经济地发挥抗滑桩等非连续支挡结构的支护功能的重要前提,桩间距与成拱作用密切相关.在对滑坡工程中抗滑桩桩间土拱效应的力学模型进行分析的基础上,提出桩间距与桩后土体粘聚力c及其内摩擦角Φ的关系式,利用抗滑桩桩间形成土拱的条件来控制抗滑桩的最大桩间距,并确定出几种情况下最大桩间距的求解公式,最后以实际工程的优化设计来验证其合理性.

Soil arching effect is an important precondition for bringing into play the role of adjacent pertaining of anti-sliding piles safely and economically. And the spacing between adjacent piles is related to arching effect. Based on the analysis of the soil arch effect between adjacent anti-sliding piles in some slope projects,it is proposed that the relation between the piles spacing and the cohesive force c as well as the internal friction angle of the soil behind piles can be found, and the suitable spacing can be controlled by using adjacent anti-sliding piles to form soil arch. Then, solution formula of the best piles spacing is determined in several conditions. At last, its rationality can be validated by the optimization design of an actual project.