摘要
研究目的:高速铁路对路基工程工后沉降控制十分严格,路基工程工后沉降主要为铁路铺轨完成后地基的残余沉降。为满足高速铁路路基工后沉降控制要求,需选择合适的地基沉降计算方法,并根据沉降计算结果选取合理的地基加固措施。研究结论:软土、松软土等高压缩性地基和中等压缩性黏性土地基压缩层计算厚度按附加应力等于0.1倍自重应力确定;非黏性土地基和低压缩性黏性土地基压缩层计算厚度按附加应力等于0.2倍自重应力确定。CFG桩复合地基加固范围的沉降按土体复合压缩模量法计算,下卧层沉降按等效实体法计算时,计算结果与实测沉降较接近。钻孔灌注桩桩板结构地基加固范围沉降按桩基理论计算,下卧层沉降按应力扩散法计算时,计算结果与实测沉降较接近。
Research purposes： The high -speed railway has a very strict requirement on the post -construction settlement of the foundation and the post - construction settlement of the foundation belongs to the residual settlement after rail laying. The appropriate calculation method for the foundation settlement should be chosen to satisfy the requirement of the post - construction settlement of high - speed railway, and the appropriate measures should be taken according to the calculation result of the settlement.
Research conclusions： The calculation thicknesses of the compression layer of the soft - soil high - compression foundation and the medium -compression clay foundation should be determined according to that the additional stress is equal to the 0.1 time of its stress. The calculation thicknesses of the compression layer of the non - clay foundation and the low - compression clay foundation should be determined according to that the additional stress is equal to the 0.2 time of its stress. The settlement in the reinforced range of the CFG pile composite foundation should be calculated by using the soil composite compression modulus method. When the settlement of the subjacent bed is calculated by using the equivalent entity method, its calculation result is rather closed to the real settlement. When the settlement in the reinforced range of the bored cast - in - place pile structure foundation is calculated with the pile theory and the settlement of the subjacent bed is calculated by using the stress diffusion method, their calculation results are rather closed to the measured settlement.
出处
《铁道工程学报》
EI
北大核心
2013年第3期11-15,共5页
Journal of Railway Engineering Society
关键词
高速铁路
工后沉降
沉降控制
地基处理
沉降监测
high - speed railway
post - construction settlement
deformation control
foundation treatment
settlement observation
