隧底隆起偏压浅埋矩形隧道围岩应力上限分析

摘要

Based on the upper limit analysis method, bias shallow rectangular tunnel rock stress analytical formula considering uplift at the end of tunnel is derived, and the tunnel surrounding rock stress under different deep rock mass ratio and shear strength parameters are studied. The results show that the shallow tunnel surrounding rock limit pressure increases with increasing of tunnel depth and the section size. However, the shallow tunnel surrounding rock limit pressure reduces with increasing of geotechnical cohesion and internal friction angle.%基于极限分析上限法，给出了考虑隧底隆起偏压浅埋矩形隧道围岩应力的解析解表达式，并对不同深埋比和岩土体抗剪强度参数对隧道围岩应力的影响进行了研究。研究结果表明：随着浅埋隧道的埋深及断面尺寸的增大，浅埋隧道极限围岩压力也将增大；浅埋隧道极限围岩压力随着岩土黏聚力和内摩擦角的增大而显著减小。