武广客运专线红粘土地基固结变形特性研究  

Study on consolidation deformation characteristics of red clay foundation along Wuhan-Guangzhou Passenger Line

作　　者：王亮亮[1] 杨果林[1] 

机构地区：[1]中南大学土木建筑学院,长沙410075

出　　处：《工程勘察》2010年第3期1-5,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金资助项目(50778180);铁道部科技研究开发计划项目(2005K002-B-2-1)

摘　　要：客运专线对地基变形要求非常严格,需要对红粘土地基的固结变形进行深入研究。选取一线路横断面并在不同深度埋设了3个单点沉降计,监测红粘土地基不同深度的沉降,在监测断面附近不同深度钻孔取样,进行室内固结及膨胀性实验,根据现场监测数据和室内试验结果,研究了红粘土地基的变形特性。研究表明:红粘土从表层到底层压缩性逐渐增大;中层土体的回弹性、粘滞性均比上下层大;红粘土的膨胀性对地基的变形规律影响较大,修建在红粘土地基上的客运专线路基必须有足够的换填高度,以抵制地基的膨胀压力;在修筑上部结构前应放置足够长的时间,使地基土体内部应力或变形能够充分调整完成,从而减少工后变形。Passenger Transport line has strict requirement about foundation deformation, so the law of red clay foundation consolidation deformation needs to be further researched. Embed three single-point settlement sensors at different depths to measure amount of deformation, combined with consolidation and swell-shrinking test result, system analysis of red clay foundation deformation characteristics has been conducted. Research results indicate that the compressibility increases with depth increasingly; the capability of elastic resilience and viscosity of the middle part soil is stronger than other parts; the expansibility has significantly influence with the deformation characteristics; the subgrade of Passenger Transport line must have enough height to restrain the foundation expansion; the subgrade needs standing time to allow the foundation to finish stress and deformation adjustment.

关 键 词：客运专线 红粘土 固结变形 

分 类 号：TU446[建筑科学—岩土工程]