淤泥区狭长基坑抗隆起稳定性分析

摘要:

针对珠三角某综合管廊工程坑底土层为深厚淤泥的情况,采用有限元软件进行数值模拟,基于强度折减法对基坑破坏模式进行分析。计算结果表明：狭长类基坑破坏时,依旧表现为坑底产生较大的隆起变形,但呈现的滑动面会受到对侧支护桩约束影响,计算得到安全系数明显高于半无限体假定下的圆弧滑动结果,也更符合实际情况。本文进一步分析了坑底加固深度、基坑宽度等对深厚淤泥类软土中狭长基坑坑底抗隆起稳定性的影响,研究结果可为类似工程提供参考。

Abstract:

Strength reduction method is used to analysis the basal heave failure of a utility tunnel foundation pit in deep silt area. The analyzed results show that, the displacement at bottom is greater when this foundation pit collapses, the circle arc slide plane of narrow-deep foundation pit is affected by the opposite side fender post, and the safety factor result is significantly higher than of the semi-infinite body assumption. This article uses the simulation method to further analyze the influence of the thickness of soil reinforcement and the width of foundation pit on the basal stability of narrow-deep foundation pit in silt area.