Numerical method of tunnel face pressure estimation considering progressive failure due to excavation
Numerical method of tunnel face pressure estimation considering progressive failure due to excavation
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DOI：
10.1088/1755-1315/833/1/012157
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
Y. Togashi;I. Shota;M. Osada;R. Kawanoue
中科院分区：
文献类型：
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作者：
Y. Togashi;I. Shota;M. Osada;R. Kawanoue
隧道工作面的稳定是隧道施工的重中之重。工作面前方土压力的估算是工作面稳定性评价的关键，为了解工作面稳定性特征，开展了大量的模型试验。另一方面，在许多情况下，利用Terzaghi导出的松动土压力作为边界条件，假设一个恒定的滑移区，通过极限分析来评价巷道工作面稳定性，但实际的滑移区并不总是恒定的，而是随着工作面的坍塌而逐渐扩大的。过去很少有研究考虑到这一现象。本文提出了一种考虑工作面坍塌过程的巷道工作面压力估算方法。所提出的方法是一种极限平衡法。假设有一条具有相同中心和不同半径的两个椭圆的滑移线，从周向的无限小单元平衡出发，计算了巷道工作面方向的一阶线性土压力微分方程。
The stability of the tunnel face is a top priority in a tunnel construction. The estimation of the earth pressure acting in front of the face is essential for the stability evaluation of the face, and many model experiments have been conducted to understand the characteristics of face stability. On the other hand, there are many cases in which the stability of the tunnel face is evaluated by limiting analysis assuming a constant slip region by applying the loosening earth pressure derived by Terzaghi as a boundary condition, but the actual slip region is not always constant and expanded progressively accompanying by the collapse of the face. There are few past studies that have considered this phenomenon. In this study, a estimation method of the tunnel face pressure are developed in consideration of the progress of face collapse. The proposed method is a kind of limit equilibrium method. Assuming a slip line with two ellipses with the same center and different radii, the first-order linear differential equation of earth pressure in the tunnel face direction is calculated from the equilibrium for infinitesimal elements in the circumferential direction.