湿陷性黄土区客运专线长短桩复合地基的沉降观测与预测分析

On the basis of collapsible loess subgrade experiment engineering along one passenger dedicated line，the subgrade settlement deformation is observed and predicted in the article. Also，the author studies the settlement deformation characteristics and effect of settlement controlling with long-short-pile composite foundation under high-speed railway technology conditions. The results show that foundation settlement is main component of subgrade settlement，and it mainly manifested in substratum settlement under the depth of foundation treatment. It's a reasonable way that subgrade final settlement is predicted by the hyperbolic method，three-point method and Asaoka method. Residual settlement meet the controlling requirements of laying unballasted track for subgrade settlement after construction. It's a rational and effective way to adopt long-short-pile composite foundation in foundation treatment on collapsible loess ground.