复合多层地层边坡组合式圆截面抗滑桩受力变形特征及其应用研究  

Deformation,Force Characteristics and Application of Combined Stabilizing Piles with Circular Cross-section in Multi-strata Slopes

作　　者：罗晓娟 宋成彬 姚文敏 寇桓嘉 贺鑫 LUO Xiaojuan;SONG Chengbin;YAO Wenmin;KOU Huanjia;HE Xin(Zhejiang Highway&Water Transportation Engineering Co.,Ltd.,Hangzhou 310006,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]浙江公路水运工程咨询有限责任公司,浙江杭州310006 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]郑州大学土木工程学院,河南郑州450001

出　　处：《安全与环境工程》2023年第4期120-130,140,共12页Safety and Environmental Engineering

基　　金：国家自然科学基金优秀青年科学基金项目(41922055);国家自然科学基金项目(42107181);浙江省交通运输厅科技计划项目(2021023);中国博士后科学基金资助项目(2021M702932)。

摘　　要：组合式抗滑桩在各类大型、复杂地层结构边坡防护工程中得到了广泛应用,但复合多层地层边坡中组合式抗滑桩加固机理的研究仍有待深入。基于统一强度理论建立了复合多层地层边坡组合式圆截面抗滑桩群地质力学模型,提出了一种适用于复合多层地层边坡组合式圆截面抗滑桩变形与内力计算的有限差分方法。以提出概化的复合多层地层边坡模型为算例,通过对综合传统等效m法与有限差分数值模拟结果进行对比,研究了复合多层地层边坡组合式圆截面抗滑桩受力变形特征,并进一步结合浙江梅店公路边坡开展了工程应用研究。结果表明:相较传统等效m法,改进算法所得桩顶水平位移、最大正值弯矩和最大负值弯矩均有所增加,其计算结果更接近于数值模拟结果,计算结果更准确;组合式抗滑桩前、后排桩桩顶水平位移相等,受连系梁的影响,最大正值弯矩出现在滑动面以上;采用组合式圆截面抗滑桩支护的浙江梅店公路边坡的稳定性系数从1.05提升至1.83,公路边坡稳定性提升显著。研究成果可为组合式抗滑桩加固设计提供依据。Combined stabilizing piles are widely used in reinforcement of slopes with large scale and multiple strata.However,the understandings of reinforcement mechanisms of combined stabilizing piles in multi-strata slopes are still limited.In this study,based on the unified strength theory,the geomechanical model of stabilizing piles in slopes with multiple strata was constructed,and a new finite difference method for evaluating the deformation and force of combined stabilizing piles with circular cross-section in multi-strata slopes were proposed.Using a generalized slope model with multiple strata as an example,the conventional equivalent method and the finite difference-based numerical simulation method were used to validate the proposed method and to obtain comparative characterization of the deformation and force of combined stabilizing piles with circular cross-section in multi-strata slopes.The Meidian highway slope in Zhejiang Province was then adopted for further studies of engineering application.The results indicate that compared with the equivalent method,the displacement at the head of the piles and the maximum positive and negative bending moment of the piles calculated by the proposed method are greater;the results of the proposed method are more accurate as they are closer to those of numerical simulation.The displacement at the head of the fore-and rear-piles are the same.Controlled by the beam,the position with the maximum positive bending moment is above the sliding surface.The stability coefficient of the Meidian highway slope reinforced by combined stabilizing piles with circular cross-section is increased from 1.05 to 1.83,which can effectively treat highway slope.The results of the study can provide basis for the reinforcement design of combined stabilizing piles.

关 键 词：复合多层地层边坡 组合式圆截面抗滑桩 统一强度理论 有限差分法 传统等效m法 

分 类 号：X4[环境科学与工程—灾害防治] TU473.1[建筑科学—结构工程]