Abstract Based on a typical failure mode of shallow tunnels in sloping areas, the combined limit analysis upper bound method and the nonlinear failure criterion of the tangent method were used to derive the surrounding rock pressure formula of a shallow tunnel in a sloping area with consideration given to the slope crest load. MATLAB software was used to program the optimization solution, which analyzed the impact of the slope- top load and burial depth ratio on the surrounding rock pressure of the shallow tunnel and failure mode. The results show that the surrounding rock pressure of the shallow tunnel increases with an increase of the ground nonlinear coefficient and a decrease of the counter-force ratio of the horizontal-to-vertical support; both the increase of the slope crest load and burial depth ratio will reduce the surrounding rock stability of the shallow tunnel; and with the increase of the slope crest load and burial depth ratio, the failure of the shallow tunnel deflects to the side of the slope, where it is relatively shallow.
Abstract：
Based on a typical failure mode of shallow tunnels in sloping areas, the combined limit analysis upper bound method and the nonlinear failure criterion of the tangent method were used to derive the surrounding rock pressure formula of a shallow tunnel in a sloping area with consideration given to the slope crest load. MATLAB software was used to program the optimization solution, which analyzed the impact of the slope- top load and burial depth ratio on the surrounding rock pressure of the shallow tunnel and failure mode. The results show that the surrounding rock pressure of the shallow tunnel increases with an increase of the ground nonlinear coefficient and a decrease of the counter-force ratio of the horizontal-to-vertical support; both the increase of the slope crest load and burial depth ratio will reduce the surrounding rock stability of the shallow tunnel; and with the increase of the slope crest load and burial depth ratio, the failure of the shallow tunnel deflects to the side of the slope, where it is relatively shallow.
LUO Wei- 1,
2 Zeng-Run-Zhong- 2 Rong- Yao- 1 Geng-Da-Xin- 2 Shi-Yu-Feng- 2
.Stability Analysis of the Surrounding Rock of Shallow Bias Tunnels under a Slope Crest Load[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(5): 56-62
2016, Vol. 53 