某边坡抗滑桩失效机理研究

采用二维有限元强度折减法,分析了基坑开挖、抗滑桩桩径、桩长和强降雨等因素对某边坡稳定安全系数、最大剪切应变和抗滑桩最大弯矩的影响.通过类比分析表明,该边坡抗滑桩失效原因是由基坑开挖、抗滑桩桩长太短和强降雨等因素共同促成;在此边坡工程岩层情况下,当抗滑桩桩长达到18 m以上时,最大剪切应变可以控制发生在中风化泥岩以下,而且不会对上部坡体产生较大剪切变形;采用有限元强度折减法计算出来的抗滑桩弯矩图和传统的悬臂桩法计算的结果接近,且和工程上采用经验法计算出的抗滑桩弯矩图近似.本文的分析方法和分析结果可以为以后边坡抗滑桩设计提供一定借鉴意义,也为基坑开挖后果的预测提供可行的研究方法.

Failure mechanism of a slope anti-sliding pile

Analysis hows the excavation,the diameter of anti-slide pile,the pile＇s length and the heavy rainfall factors affect the stability and security factor of the slope, the naaxinmna shear strain and anti-slide pile naaxinmna bending naonaent by the dimensional finite dement strength reduction method. Through the analogy analysis shows that the slope anti-pile＇s failure was caused by foundation excavation,length of anti-spile is too short and heavy rainfall;in the case of this slope engineering rock,when the anti-pile＇s length reach more than 18 m,the maximum shear strain can be controlled below in middle weathered mudstone and does not have a greater shear deformation to the upper slope. Diagram of anti-slide pile bending moment calculated by using the finite dement strength reduction is dosed to both of that calculated by using the empirical method and cantilever piles. The analytical method and results of this article can provide a certain reference for designing of later slope anti-pile, and provide a feasible method for the prediction of foundation excavation＇s consequences.