砾石桩复合地基桩土作用性状分析

为了探究盐渍土地区砾石桩复合地基桩土作用性状，结合西北地区某盐渍化软土地基处治试验段，运用有限元软件建立砾石桩复合地基数值分析模型，考虑砾石桩复合地基在施工期和运营期排水固结的前提下，对上部路基荷载作用下砾石桩复合地基桩土的承载性状、沉降性状、应力分担等作用性状进行分析。结果表明:路基填土高度对砾石桩复合地基桩土作用性状产生了较大的影响；路基填筑期至运营期，桩土应力比呈现先增大后减小，直至趋于稳定的变化规律。

Behavior Analysis of Pile-soil Interaction in Gravel Pile Composite Foundation

In order to explore the behavior of pile-soil interaction in gravel pile composite foundation in saline soil area, herein based on the test section for treatment of a salinized soft soil foundation in the northwest, a numerical analysis model was established with finite element software. Considering that the gravel pile composite foundation is subject to drainage consolidation during construction and operation, the behavior of bearing, settling and stress sharing of the foundation under the action of upper subgrade load were analyzed. The results show that, the filling height of subgrade has great influence on the behavior of pile-soil interaction in gravel pile composite foundation; from the filling period to the operation period, the pile-soil stress ratio presents a variation law of first increase then decrease till it becomes stable.