长板-短桩工法处理吹填土地基承载性能研究  

Study on Bearing Capacity of Dredger Fill Foundation Treated by D-M Method

作　　者：董必昌[1] 张明轩 张鹏飞 田智睿 DONG Bichang;ZHANG Mingxuan;ZHANG Pengfei;TIAN Zhirui(School of Transportation,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2021年第2期303-307,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金青年基金项目(51608407)。

摘　　要：吹填土深厚软土地基的加固处理是目前软土地基处理的技术难点之一.文中以温州市瓯江口新区铁路S1线的地基处理工程为依托,使用有限元软件Abaqus对长板-短桩复合地基的沉降特性与承载力性质进行了研究,并与水泥搅拌桩法和排水固结法进行综合对比分析,研究结果表明:①长板-短桩工法最终沉降小于排水固结法所得沉降,而固结速度高于水泥拌桩法固结速度;②通过引入桩体等效压缩模量、等效渗透系数以及土体等效渗透系数等参数,可将三维问题转化为二维问题,最终长板-短桩复合地基承载力与规范计算方法所得结果相近,因此该模拟方法具有可行性;③与水泥搅拌桩法复合地基相比,长板-短桩复合地基的承载力提高了10%以上,证明了该工法的优越性.The reinforcement of deep soft soil foundation with dredger fill is one of the technical difficulties in soft soil foundation treatment.Based on the foundation treatment engineering of the S1 line of the Lanzhoukou New District Railway in Wenzhou City,the settlement characteristics and bearing capacity of D-M composite foundation were studied by using the finite element software Abaqus,and compared with cement mixing pile method and drainage consolidation method..The results show that:①The final settlement of D-M method is less than that of drainage consolidation method,while the consolidation speed is higher than that of cement-mixed pile method.②By introducing parameters such as pile equivalent compression modulus,equivalent permeability coefficient and soil equivalent permeability coefficient,the three-dimensional problem can be transformed into two-dimensional problem.Finally,the bearing capacity of D-M composite foundation is similar to that of the code calculation method,so the simulation method is feasible.③Compared with cement mixing pile composite foundation,the bearing capacity of D-M composite foundation is improved by more than 10%,which proves the superiority of this method.

关 键 词：吹填土 长板短桩 沉降特性 复合地基承载力 水泥搅拌桩 

分 类 号：U416[交通运输工程—道路与铁道工程]