The invention provides a goaf tunnel lining structure safety evaluation method and
system under heavy rainfall, and relates to the technical field of underground and
tunnel engineering.The method comprises the steps that a tunnel evaluation index is generated by obtaining rainfall intensity, rainfall duration, geological characteristics, soil permeability and other data; the method comprises the following steps: analyzing interaction of rainfall
moisture on lining
water pressure and surrounding soil deformation, calculating surrounding rock stress, calculating
water pressure generated after rainfall
permeation, quantifying dynamic influence of the
water pressure on the lining water pressure, and calculating a
safety coefficient of a lining structure by integrating a tunnel evaluation index, the surrounding rock stress and the water pressure after
permeation. And obtaining lining displacement, crack development speed and
water flow permeation data, generating a risk coefficient, comparing the risk coefficient with a
safety coefficient, and judging whether to give out early warning or not. According to the method, related data of the tunnel lining are comprehensively analyzed, a
tunnel safety evaluation and early warning mechanism is established, and the safety of the goaf tunnel lining structure under the heavy rainfall condition is ensured.