盾构施工开挖面稳定分析研究

Stability analysis for excavated section of shield tunnel

以西安地铁盾构施工为背景,研究了盾构施工时开挖面的稳定性,借鉴粘性土坡稳定分析方法中的费连纽斯条分法的基本原理,推导出了三维情况下无限条分法计算开挖面稳定性的解析公式,并通过算例,引用生物遗传进化法的思想,搜索出了最危险滑裂面,确定了保证开挖面稳定的盾构施工最小支护力。

This paper, based on the shield construction of Xi＇an Subway, mainly studies the stability of the tunnel face in the shield construction. Making use of the fundamental principle of the Fellenius method of slices in the slope stability analysis, the author develops an analytic formula for the stability of the tunnel face with the infinite slice method under the 3 D condition. In addition, by using the biological genetic evolution approach, the author also finds the most dangerous slip surfaces and works out the minimal supporting load for the stability of the tunnel face in the shield construction.