中文摘要：

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。

英文摘要：

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.