低强高压旋喷桩复合地基承载的影响因素  

Influence factors of bearing characteristics for high-pressure jet grouting piles composite foundation with low intensity

作　　者：冯国俊 刘诗净 王荣 

机构地区：[1]北京科技大学,北京100083 [2]强震区轨道交通工程抗震研究北京市国际科技合作基地,北京100083 [3]中国港湾工程有限责任公司,北京100027

出　　处：《水运工程》2017年第12期185-191,203,共8页Port & Waterway Engineering

基　　金：国家自然科学基金资助项目(No.51178045);教育部海外名师资助项目(MS2011BJKJ005);2016年北京科技大学-台北科技大学专题联合研究计划项目(TW201601)

摘　　要：基于高压旋喷桩复合地基有限元模型,研究低强高压旋喷桩正三角形布置和正四边形布置时,桩体弹性模量、桩长、土体内摩擦角对复合地基承载特性的影响,并分析高压旋喷桩的有效桩长。结果表明:正四边形布置时土体的最大竖向沉降量是正三角形布置时的93%,桩体最大竖向应力值是正三角形布置时的97%,采用正四边形布置要优于正三角形布置;随着高压旋喷桩弹性模量的减小,土体最大沉降量增大,桩体最大竖向应力减小;随着土内摩擦角的增大,土体最大沉降量减小,桩体最大竖向应力减小;当采用正三角形或正四边形布置时桩长超过10 m时桩体最大竖向应力基本不变,因此低强度高压旋喷桩有效桩长约为10 m,与文献计算结果和设计取值基本一致。Based on the finite element model of high-pressure jet grouting piles composite foundation,when the arrangement forms of high pressure jet grouting pile with low intensity are equilateral triangle and equilateral quadrilateral,we study the influences of elastic modulus of pile,internal friction angle of soil,and length of pile on the bearing characteristics of composite foundation, and analyze the effective length of high-pressure jet grouting pile.The results show that the maximum vertical settlement value of soil with the arrangement form of equilateral quadrilateral is 93% of it with the arrangement form of equilateral triangle,the maximum vertical stress value of pile is 97% of it with the arrangement form of equilateral triangle arrangement,and the arrangement form of equilateral quadrilateral for high pressure jet grouting pile is better than the arrangement form of equilateral triangle for it.With the decrease of the elastic modulus of high pressure jet grouting pile, the maximum settlement value of soil increases,and the maximum vertical stress value of pile decreases.With the increase of the friction angle of soil,the maximum settlement of soil decreases,and the maximum vertical stress value of pile also decreases. The maximum vertical stress vertical of pile with the arrangement form of equilateral quadrilateral and equilateral triangle is basically unchanged when the length of pile is more than 10 m,so the effective length of high-pressure jet grouting piles with low intensity is about 10 m,and it is consistent with the results of the literature and the design values.

关 键 词：复合地基 高压旋喷 低强度 布置形式 有效桩长 

分 类 号：TU47[建筑科学—结构工程] U655.55[建筑科学—土工工程]