Reliability Analysis of Inclined Shield Tunnel Face Considering Pore Water Pressure
To study the stability of inclined tunnel face under the action of pore water,the pore water is introduced to the calculation model of inclined tunnel excavation face as an external force,and the analytical solution of the support force under the action of pore water is solved by using limit analysis method,and the upper limit solution of the support force is obtained by solving the Sequence Quadratic Program(SQP)algorithm.According to the reliability theory,the limit state equation of inclined tunnel excavation face is established,and the influence of tunnel inclination Angle,pore water pressure coefficient,water level height and Hoek-Brown parameters on the failure probability of tunnel excavation face,and the reasonable range of support force under different safety grades are analyzed.Pore water and tunnel inclination angle have significant effects on tunnel stability.The failure probability of tunnel excavation face increases with the increase of pore water coefficient.It has provided theoretical support for inclined tunnel support under the action of pore water.
pore pressure effectinclined tunnellimit analysis methodfailure probability
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