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文章通过数值分析对上部隧道施工造成下部隧道内力及位移发生变化的规律进行了全过程仿真模拟。从分析结果来看,下部左隧道受力最不利为上部右隧道施工完成后;而下部右隧道受力最不利为上部左隧道施工完成后,右隧道施工前;从隧道开挖过程中位移变化来看,量值总体较小,基本控制在安全基准范围内,下部左、右隧道的内力满足衬砌受力要求,该交叉隧道处于安全状态。
Through numerical analysis, the whole process simulation of the variation of the internal force and displacement of the lower tunnel caused by the construction of the upper tunnel has been carried out. From the analysis results, the lower left tunnel is the most unfavorable for the construction of the upper right tunnel after the completion of the construction; while the lower right tunnel is the most unfavorable for the construction of the upper left tunnel after the completion of the right tunnel before construction; from the tunnel during excavation displacement changes In general, the values are generally small within the safety benchmark, and the internal forces of the lower left and right tunnels satisfy the requirements for lining force. The cross-tunnel is in a safe state.