地下连续墙泥浆槽壁稳定的三维分析

3-D STABILITY ANALYSIS OF SLURRY TRENCHES

为了防止地下连续墙泥浆槽壁的倒塌或剥落，需要确定合理的泥浆重度。本文介绍采用槽壁破坏体为一具有倾斜滑动面的抛物线柱体的假设，根据受力最不利的原则，从破坏体高度、厚度、滑动面倾角三个方向搜索最危险破坏面的三维分析法。文中引用了两个算例数据分别采用槽壁稳定分析的抛物线法，半圆柱法以及本文的三维分析法进行了对比计算，同时还用三维分析法对影响泥浆槽壁稳定的主要因素进行了研究，得到了各种因素的影响规律。分析结果表明，抛物线法和半圆柱法得到的最小泥浆重度只是局部极大值，三维分析法计算结果更可靠。

To prevent slurry -wall from collapsing, the slurry density must be designed properiy. This paper deals with the 3-D stability analysis method which assumes that the collapse shape is parabolic and the collapsing plane is determined by searching on 3 dimensions. Two examples are given, they show the different results derived from parabola model, cylinder model and 3 -D model. The effects of different factors on the stability of trenches are given by the 3-D model. Based on the analysis, it is concluded tha both parabola model and cylinder model trend to show lower slurry density, the 3-D stability analysis method discussed in this paper proves more reliable results.