武汉某基坑喷锚网支护稳定性分析

Stability analysis of shotcrete-bolting-mesh support of a foundation pit in Wuhan

本文介绍了武汉某基坑工程成功采用喷锚网支护的实例。文章以基坑的Ⅶ区为例,对内部和外部稳定性进行了验算,在内部整体稳定性验算中采用了圆弧瑞典条分法,可得整体稳定性安全系数为8.9;各锚杆的抗拔安全系数分别为5.40、2.57、1.55;在外部稳定性分析中,抗滑动稳定安全系数为1.4,抗倾覆安全系数为12.3,安全性均满足要求。验算结果证明采用该支护方式可以确保基坑在开挖过程中的安全性,该工程的成功经验对武汉地区深基坑开挖支护与施工等具有一定的参考价值。

This paper introduces an example of a foundation pit engineering in Wuhan using shotcrete-bolting-mesh support. Taking the district Ⅶ as example, the internal and external stabilities of the pit are calculated. Swedish slices method is used to calculate the integral stability of the pit, and the results are that the integral stability coefficient is 8.9, the anti-pulling safety factors of bolts are 5.40, 2.57 and 1.55, the stability coefficient against sliding is 1.4 and the anti-toppling safety factor is 12.3, all of which meet the safety need. In a word, the engineering proves to be successful through the checking calculations. The research provides very useful and beneficial experiences for the design and construction of deep foundation pit in Wuhan.