摘要
通过对某工程水泥搅拌桩复合地基试验 ,分析室内水泥土强度随龄期、掺入比、含水量及外掺剂等变化的发展规律 ,探讨复合地基桩土共同作用下的承载情况和地基对承台的反力模式 .分析表明 ,不同水泥土随掺入比和龄期的变化 ,其强度差异较大 ;水泥土破坏应变仅为 1%～ 2 %,基本属脆性破坏 ;复合地基的承载力基本值随确定方法的不同而有不同结果 ;桩顶存在较大的集中反力 ,桩土应力分担比在不同荷重下有很大的变化 ,在上部荷重为 12 0～ 380kPa时应力分担比在 10左右 .
A test on the composite foundation improved with cement mixing piles in a practical engineering project is performed. The regularity of variation of the laboratory cement soil strength with its age, cement ratio, water content, and additive is analyzed. The bearing capacity and reaction pattern of the foundation on the bearing cap under the pile-soil interaction are studied. It is indicated that the cement soil strength is evidently influenced by the cement ratio and the age. The strain of cement soil at failure is 1%～2%, showing that the cement soil is in a brittle failure state. The basic value of the bearing capacity of the composite foundation varies with the method with which the capacity is determined. There is a large concentrated reacting force on the top of the pile, and the stress ratio of pile and soil is remarkably influenced by the load. If the load is 120～380kPa, the stress ratio is about 10.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2001年第6期73-78,共6页
Journal of Hohai University(Natural Sciences)
