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基于极限分析上限定理和空间离散技术,构建了适用于在饱和土体中掘进的盾构隧道开挖面上限破坏机制。在此基础上,将孔隙水压力做的功率作为一个外力功率引入上限定理的虚功率方程,通过优化计算,得到了孔隙水压力作用下盾构隧道开挖面支护力的上限解。为了证明上限解的有效性,基于数值模拟技术计算了孔隙水压力作用下隧道开挖面极限支护力的数值解,并将得到的数值解和上限解进行了对比分析,结果表明,上限解和数值解非常接近。最后,分析了参数变化对开挖面支护力和破坏面的影响,分析结果表明:孔隙水压力对支护力上限解影响明显而对开挖面破坏范围的影响不大。
Based on the upper bound theorem of limit analysis and spatial discretization, the upper limit failure mechanism of shield tunneling face suitable for tunneling in saturated soils is constructed. Based on this, the power of pore water pressure is introduced into the virtual power equation of upper bound theorem as external force, and the upper bound solution of shield tunneling supporting force under pore water pressure is obtained through optimization calculation. In order to prove the validity of the upper bound solution, the numerical solution of the limit supporting force of tunnel excavation face under pore water pressure was calculated based on numerical simulation. The numerical solution and the upper bound solution were compared and analyzed. The results show that the upper bound solution And the numerical solution is very close. Finally, the influence of the parameter variation on the supporting force and failure surface of the excavation face is analyzed. The analysis results show that the influence of the pore water pressure on the upper limit solution of support force is obvious and the influence on the failure range of the excavation face is not significant.