气举反循环清理地下连续墙槽底沉渣数值分析

Numerical Analysis on Slag Removal of Diaphragm Wall Groove Bottom by Air-lift Reverse Circulation

摘要:

为了深入研究用气举反循环清除地下连续墙槽底沉渣的效果，采用Fluent软件，运用模拟数值分析的方法，建立二维模型，并以气举混合器安置深度、空压机清槽压力、沉渣直径为研究对象，得出了如下结论：气举反循环技术能够有效地将沉渣从连续墙基坑底部返出，沉渣的出口速度范围在0.014～1.098 m/s，粘粒的逃逸速度比其它粒径的逃逸速度大；沉渣厚度越大，沉渣清理出来越难。

Abstract:

In order to study the application effect of air-lift reverse circulation in slag removal of diaphragm wall groove bottom, Fluent software was used to establish a two-dimensional model by means of simulated numerical analysis method. The placement depth of air-lift mixer, slag cleaning pressure of air compressor and slag diameter are taken as the research objects. It is concluded that the air-lift reverse circulation technology can effectively remove slag from the foundation pit bottom of diaphragm wall. The velocity of slag flowing out is 0.014～1.098m/s, the escape velocity of clay particles is faster than that of slag with other sizes; and the thicker the slag is, the more difficult the slag removal is.