非饱和土地基沉降计算参数试验研究

研究目的:提出非饱和土地基沉降计算参数确定的有效试验方法,可使地基沉降计算参数选择更加合理,对于以地基沉降为主要控制因素的高速铁路客运专线建设具有重要意义.研究结论:针对胶济客专非饱和粉质黏土、粉土开展了室内固结试验及多种现场原位试验,经过综合分析得出:胶济客专非饱和粉质黏土、粉土饱和度一般在46％ ～ 80％之间；建议采用室内固结试验、静力触探试验及标贯试验综合确定非饱和粉质黏土、粉土沉降计算压缩模量参数；可按《建筑地基基础设计规范》计算当量模量对应的经验系数进行计算沉降修正.

Testing Study on Design Parameter of Settlement for Unsaturated Soil Foundation

Research purposes: To propose an effective test method to get suitable Settlement calculation parameter for unsaturated soil,it is very practical to high-speed rail passenger line with strict settlement demand. Research conclusions:Based on the unsaturated silty clay and floury soil of Qingdao-Ji’nan passenger special line,carried by the consolidation test and in-situ tests,the results show that the unsaturated silty clay and floury soil’s saturation is between 46%~80%,the compression modulus of which to calculate settlement can be comprehensively obtained through the consolidation test,cone penetration test and standard penetration test;and the calculating settlement of which can be revised according to the empirical coefficient of the Code for design of building.