基于非侵入式方法的抗滑桩加固边坡最优桩位确定  

The determination of optimal pile location for pile-reinforced slope stability using non-intrusive method

作　　者：蔡凤珍 文嘉辉 李亮[1] 王超 李辉 李堂飞 于广明[1] CAI Fengzhen;WEN Jiahui;LI Liang;WANG Chao;LI Hui;LI Tangfei;YU Guangming(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China;Qingjian Group Co.,Ltd.,Qingdao 266071,China;Qingdao Xinhuayou Construction Engineering Group Co.,Ltd.,Qingdao 266101,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266525 [2]青建集团股份公司,青岛266071 [3]青岛新华友建工集团股份有限公司,青岛266101

出　　处：《青岛理工大学学报》2025年第2期49-57,共9页Journal of Qingdao University of Technology

基　　金：国家自然科学基金(52171264)。

摘　　要：为合理确定抗滑桩加固边坡中的最优桩位,在PLAXIS-2D中建立抗滑桩加固边坡模型,利用Python编程实现了PLAXIS-2D模型的非侵入式调用,基于提出的非侵入式方法,构建了不同桩位与嵌固比下加固边坡安全系数与土体参数之间的二次多项式函数响应面,最终提出了基于非侵入式方法与响应面相结合的抗滑桩加固边坡可靠度分析方法。所提方法在某均质土质边坡中进行了应用。分析了不同桩位与嵌固比下,加固边坡可靠度指标的变化规律。研究结果表明:在某一桩位下,随嵌固比的增加,加固边坡可靠度指标β呈现先增大后略微减小的趋势,最高β所对应的嵌固比介于0.6~0.8。不考虑桩长因素时,P=0.5(抗滑桩位于边坡中部)时,加固效果最优(β最大)。考虑桩长因素时,当目标β较小(≤1.75)时,最优桩位在P=0.3(抗滑桩位于边坡中下部);当目标β较大(≥2.0)时,最优桩位在P=0.5(抗滑桩位于边坡中部);随坡顶荷载增加,最优桩位向坡顶靠近。该方法对抗滑桩加固边坡优化设计具有较强的指导意义。In order to reasonably determine the optimal pile location for pile-reinforced slope.A pile-reinforced slope model is established in PLAXIS-2D,and the non-intrusive implementation of the PLAXIS-2D model is realized by Python programming.Based on the proposed non-intrusive method,the quadratic polynomial response surface functions are constructed to simulate the relationships between the safety factors and the soil parameters of the reinforced slope under different pile locations and embedded ratios.Finally,an analysis method of the pile-reinforced slope reliability is proposed by combining the non-intrusive method with the response surface.The proposed method is then applied to a homogeneous soil slope and the variation trends of the reliability index of the reinforced slope are analyzed under different pile locations and embedded ratios.The results show that under a specific pile location,the reliability index β of the reinforced slope increases at first and then decreases slightly with the increase of the embedded ratio.The embedded ratio corresponding to the highest β is between 0.6 and 0.8.Neglecting the factor of pile length,the optimal reinforcement(leading to maximum β)is achieved when the pile is located in the middle of the slope(i.e.,P=0.5).Considering the factor of pile length,when the target β is smaller(≤1.75),the optimal pile location is P=0.3(i.e.,the pile is located in the middle and lower part of the slope).When the target β is larger(≥2.0),the optimal pile location is P=0.5(i.e.,the pile is located in the middle of the slope).The optimal pile location exhibits an up-toward trend as the surcharge loading at the slope top increases.The method could act as an effective tool for the analysis and optimal design of pile-reinforced slop stability.

关 键 词：边坡稳定 抗滑桩 强度折减 响应面 蒙特卡罗法 

分 类 号：TU473[建筑科学—结构工程]