基于深基坑工程测斜监测曲线的地下连续墙弯矩估算方法研究

Research on approximate method of calculating bending moment based on lateral deformation of diaphragm walls

在深基坑工程中,为了保护基坑的安全,需对地下连续墙的弯矩承载力发挥情况做到心中有数,但就目前的工程现状来看,直接得到地下连续墙的真实弯矩很困难。为此本文作者根据深基坑工程中常规监测得到的地下连续墙的测斜曲线,建立了一种在不需要知道钢筋应力情况下就能估算地墙弯矩的简便方法,能够直接为广大工程人员掌握。这种估算方法的应用,可以节约深基坑工程中的监测费用,让工程师们及时了解地下连续墙承载力发挥情况,提前采取措施避免由于地下连续墙设计不合理引起的工程事故的发生。

Based on the beam theory, the relation between the bending moment and the measured lateral deformation of diaphragm walls could be established. The author introduced the detailed procedure to calculate bending moment by this method. With this method the engineers could know the bending moment during the pit excavation and take measures to avoid the diaphragm wall rupture if the bending moment achieved to the limit value. More, with the application of this method in deep foundation pit, the field measurements of stress of reinforcement could be canceled and the total expense would be reduced.