悬臂式支护结构中几种控制变形的方法

悬臂式支护结构是基坑工程中常用的支护形式，多以排桩、地下连续墙、工法桩、钢板桩等形式出现。基坑工程中在条件受限的情况下，无法做内撑，但周边部分建（构）筑物对基坑变形很敏感，需要采取一些辅助措施来控制基坑的变形。结合工程实例介绍了悬臂式支护结构中常用的几种控制变形的方法，包括双排桩外拉、锚杆（索）加固、基坑内斜撑、基坑内土加固、坑内预留反压土等，并对这几种方法的适用范围、技术要求等进行了分析，为今后类似工程的设计施工提供借鉴。

Deformation Control Methods in Cantilever Retaining Structure

Cantilever retaining structure is a commonly-used retaining form in excavation engineering, which comes in forms of row piles, diaphragm wall, SMW pile and steel sheet pile. The internal bracing is impossible under the confined conditions of excavation engineering, but parts of the peripheral buildings (structures) are sensitive to the excavation deformation. In this case, some auxiliary measures should be taken for excavation deformation. The paper introduces several commonly-used methods of deformation control in cantilever retaining structure with engineering examples, including two-row piles bracing, reinforcement by bolt (cable), inclined brace in foundation pit, soil consolidation in foundation pit and soil reserving for piles stability. Analysis is made on these methods about the application scope and technical requirements to provide the reference for the design and construction of similar engineering.