某港区后方交通联络线浅埋基岩复合地基沉降特性研究

以某码头交通联络线的CFG桩复合地基为工程背景,开展浅埋基岩复合地基的加固机理研究,采用ABAQUS软件分析CFG桩端距基岩距离、嵌岩深度和下伏岩性等不同工况对浅埋基岩复合地基的承载效果。结果表明,浅埋基岩的CFG桩复合地基的承载主要由桩体承担,但桩间土也能承担部分荷载;距基岩距离越小,桩顶处出现的沉降量越小,桩顶处桩土应力比越大;嵌岩深度越大,沉降量也越小,而桩顶处桩土应力比越大;下部基岩弹性模量越大,沉降量越小,桩顶处的桩土应力越大。

Study on Settlement Characteristics of Composite Foundation in Shallow Bedrock of Linking-up Road near a Harbor

Based on the CFG pile composite foundation of a harbor linking-up road,the reinforcement mechanism of composite foundation in shallow bedrock is conducted. With ABAQUS software,the effects of the distance between CFG pile and the bedrock,the rock-socket depth and different lithologies on the bearing capacity of shallow bedrock foundation are analyzed. The results show that the bearing capacity of shallow base rock CFG pile composite foundation in contributed mainly by the piles,but the soil between piles can also bear part of the load. The smaller the distance from the bedrock,the less settlement at the top of the pile and the pile soil stress ratio increases. The greater rock- socket depth,the smaller the settlement and the pile soil stress ratio increases.