软土地区影响锁口管顶拔的因素及控制措施

Factors and Control Measures on Uprooting Locked Port Tube in Soft Soil Area

软土地区地下连续墙施工过程中,锁口管接头易出现顶拔困难,导致埋管及异型幅导墙压溃破坏等问题。以软土地区某明挖地铁区间地下连续墙施工为例,结合一典型事故案例,通过计算分析以及室内模型试验相结合的方法,探讨了软土地区地下连续墙锁口管顶拔施工存在的问题和优化措施。结果表明:锁口管变形、混凝土温度、顶拔时机等因素对锁口管起拔阻力均有较大影响。为此,应采取减少槽段超挖与单元槽段槽壁坍塌、调整异型幅连续墙施工顺序等措施来解决锁口管顶拔困难的问题。

Based on thc construction background of diaphragm wall of an open trench subway tunnel in soft soil area and a typical accident in the construction, this paper analyzes the optimum measures of uprooting locked port tube of diaphragm wall in soft soil area, from the angles of engineering practice, detection, simulation and model test. It is shown that, horizontal deformation of locked port tube, concrete temperature and uprooting moment all have influence on the resistance of locked port tube. In order to ensure the uprooting of locked port tube, measures to reduce the overbreaking and collapsing of grooves, to adjust the construction sequence shall be adopted.