地表硬壳层对柔性基础下复合地基受力特性的影响分析  

Impacting analysis of dry crust on composite ground under flexible foundation

作　　者：俞建霖[1] 张甲林[1] 李坚卿 龚晓南[1] 

机构地区：[1]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [2]杭州坤博岩土工程科技有限公司,浙江杭州310058

出　　处：《中南大学学报（自然科学版）》2015年第4期1504-1510,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51378467)~~

摘　　要：在已有柔性基础复合地基解析法的基础上,考虑地表硬壳层存在对复合地基体系受力特性的影响,建立能够考虑硬壳层作用的解析方程,并利用上下层土体的变形协调条件对方程进行求解,分析硬壳层存在对软土复合地基体系力学性状的影响。通过算例分析研究不同硬壳层厚度、模量和抗剪强度对复合地基工作状态的影响。研究结果表明:硬壳层的存在会影响复合地基中性面位置、桩顶刺入量、等沉面高度等,合理利用硬壳层可以改善复合地基体系的受力状态,减小桩土应力比和桩土差异沉降。Analytic equations were established, based on analytical method of composite foundation have been established, to study the influence of the dry crust on the stress distribution of composite foundation. The results of the case analysis of different thickness, modulus and shear strength of the dry crust show that the existence of the dry crust affects the position of the neutral surface, the piercing amount of the pile and the settlement of the cushion. Hence reasonable use of dry crust can not only improve the load capacity of the composite foundation system, control, but also reduce stress ratio between pile and soil and uneven settlement.

关 键 词：硬壳层 复合地基 解析法 应力扩散 

分 类 号：TU443[建筑科学—岩土工程]