具有多道支撑的深基坑开挖离心模拟试验方法

Centrifuge Model Test Method of Deep Foundation Pit Excavation with Multi-layer Props

动态离心模型试验可用来模拟具有多道支撑的深基坑开挖过程。在该试验中,通过分时排放规定高度的代土液体来模拟土体分层开挖,通过支撑杆对开挖面的连续墙进行适时支撑,以模拟基坑开挖到一定高度后的支撑施工,并通过模型中的传感器监测离心模型受力和变形情况。本文使用研制的深基坑开挖离心模拟试验装置,采用铝板制作地下连续墙,采用水玻璃作为代土液体,进行了多组重复试验,其结果表明,该离心试验能较好模拟真实深基坑开挖过程。

An in-flight centrifuge model test is designed to simulate the deep foundation pit excavation with multi-layer props.In the test,the excavation is simulated by time sharing discharging certain liquid equivalent to soil,in a settled height,and then the diaphragm wall is supported by rods simultaneously.The sensor fixed on the centrifuge model can monitor the deformation and stress of the centrifuge model.Plenty group of tests are repeated using the developed centrifuge facility for deep foundation pit excavation,adopting aluminous sheet as underground diaphragm wall,water-glass as certain liquid equivalent to soil.The result of the subsequent test shows that the centrifuge model test can simulate the deep foundation pit excavation well.