柔性基础下水泥搅拌桩复合地基桩土应力比分析  

Analysis on Pile -soil Stress Ratio of Composite Foundation of Cement -soil Mixing Pile Under Flexible Foundation

作　　者：杨晓蓉[1] 李海超[2] 张镭于[1] 张跃 

机构地区：[1]军事交通学院基础部,天津300161 [2]军事交通学院军事交通系,天津300161 [3]空军第一防空工程处,北京100076

出　　处：《军事交通学院学报》2012年第1期81-86,共6页Journal of Military Transportation University

摘　　要：为了分析柔性基础下水泥搅拌桩复合地基桩土应力比的特性，提出纯摩擦桩位移模式；根据纯摩擦桩变形特点，确定复合地基中性点的位置；根据柔性基础下桩体复合地基的变形协调条件，确定柔性基础下桩体复合地基桩土应力比的表达式。实例计算表明，计算结果与实测值比较接近，柔性基础下水泥搅拌桩复合地基桩土应力比值一般在2～4，当其他条件不变时，桩土应力比随垫层模量、桩土模量比增大而增大，随垫层厚度增加而减小，且垫层模量对桩土应力比的影响较大。In order to analyze the characteristics of pile - soil stress ratio of the composite foundation of cement - soil mixing pile under flexible foundation, the displacement mode of friction pile was pointed out, according to the deformation charac- teristic of friction pile, the neutral point of composite foundation was ascertained. And the exact formula about length - stress ratio which addresses the problem of soft soil foundation according to the deformation co - ordination conditions of the pile composite foundation was also derived. The calculation of actual example proves that the formula about pile - soil stress ratio is in accordance with actual measurement number. The pile - soil stress ratio which addresses the problem of soft soil foundation is generally between 2 - 4. If other conditions keep invariable, pile - soil stress ratio become big when cushion modulus become big. And pile - soil stress ratios become small when cushion become deep, cushion modulus effect the length -stress ratio greatly.

关 键 词：柔性基础 水泥搅拌桩 纯摩擦桩 位移模式 桩土应力比 

分 类 号：TU431[建筑科学—岩土工程]