地下连续墙泥浆槽的稳定性分析

本文论述泥浆槽(Slurry Trenches)在短槽挖掘时的稳定性问题。文中叙述了四个泥浆槽挖掘的典型实例,其中包括两个塌槽的例子,并用土拱理论进行了分析。当前的某些关于槽稳定性分析的方法,在预测土压力方面显得较为保守。本文重点讨论了泥浆槽在附加荷载(如产生于邻接基础和邻近基础的作用)很大的情况下的稳定性问题。针对这种荷载条件,提出了一种设计步骤,通过考虑在挖掘处邻近土壤中由于附加荷载引起的应力的重分布,以及建筑结构中的应力重分布,可避免在设计中出现过分保守的现象。

The Analysis of Stability of Diaphragm Wall Slurry Trench

The mechanics of stability aspects of slurry trenches excavated in short panels for diaphragm wall is presented. Four case histories in short trench excavation including two failures are described and analyzed by arching theory. Existing analytical methods for trench stability are found to be relatively conservative in predicting earth pressures particularly for slurry trenches subjected to heavy surcharge load as from adjoining foundations. A design procedure is proposed for such loading conditions without undue conser-vativeness by considering the redistribution of surcharge load to soil adjacent to the excavation and the redistribution of stresses in building structures.