地下水位对某地下综合管廊稳定性影响研究

基于Midas软件,采用有限元分析方法开展数值模拟,分析了不同标高地下水位条件下,地下综合管廊的变形、内力和某一截面的安全系数。并将不同条件下的各项力学指标进行对比分析发现,随着地下水位不断上升,地下综合管廊主体结构最大弯矩由66.4 kN·m变为106.4 kN·m,最大剪力由134.7 kN变为224.3 kN,出现位置也从中间转变为腋角,同时最大水平位移大幅增加,由0.22 mm变为1.71 mm。某一截面安全系数由8.12降低到7.1,地下综合管廊主体结构虽仍处于安全的稳定状态,但稳定性不断下降。本文综合分析了地下水位升高对地下综合管廊稳定性的影响,为实际工程中不同地下水位条件下地下综合管廊保持稳定提供参考。

Study on the Stability of Underground Pipe Gallery under Different Groundwater Levels

Based on Midas software, the finite element method was used to analyze the deformation, internal force and safety factor of a section of underground pipe gallery under different elevation groundwater conditions. Comparing and analyzing the indicators under different conditions, it is found that with the rising groundwater level, the maximum bending moment of the main structure of the underground pipe gallery changes from 66.4 kN·m to 106.3 kN·m, and the maximum shear force changes from 134.7 kN to 224.3 kN, their position also changes from the middle to the corner of the main body of underground pipe gallery, and the maximum horizontal displacement also increases greatly from 0.22 mm to 1.71 mm. The safety factor of a section was reduced from 8.12 to 7.1. The main structure of the underground pipe gallery is still in a safe and stable state, but the stability is declining. The influence of groundwater level rise on the stability of the underground pipe gallery was comprehensively analyzed, and all of these provide theoretical guidance for the design of the main structure of the underground pipe gallery.