复杂环境下异形黄土深基坑开挖分段支护技术

Sectional Supporting Technique in Deep Special-shaped Loess Foundation Excavation in Complex Environment

以黄土地区某复杂环境下异形深基坑工程为背景,介绍了该基坑分段支护体系,详细阐述了基坑开挖过程中降水、土钉墙施工、护坡桩施工及锚索施工等环节所采取的措施和基本要求,并通过水位、基坑水平变形、地表沉降及临近建筑沉降监测结果证明了该基坑开挖支护技术的科学性。分析表明:复杂环境条件下黄土深基坑开挖采用桩锚复合支护结构分段支护既能够保证基坑安全,而且能大量节约成本。

Based on a deep special-shaped loess foundation excavation project, this paper introduces the sectional supporting technique of the project and elaborates the measures and basic requirements of dewatering, soil nailing wall construction, retaining pile construction and anchor construction. The technique is also proved to be scientific by the monitoring results of water level, horizontal displacement of the foundation excavation, ground settlement, settlement of buildings nearby. The analysis indicates that it can not only guarantee the foundation excavation safety, but also can reduce the cost.