盾构隧道局部不同部位漏水对隧道和地表沉降的影响

Influence of different leakage positions of partial tunnel on tunnel deformation and surface settlement

针对富水地区中隧道管片局部在隧道不同区域发生漏水灾害情况,建立三维流固耦合模型,对比分析了不同位置发生漏水以及在不同漏水量下地表沉降、隧道变形规律。研究表明隧道漏水位置越靠近隧道底部时,地表沉降最大值越小,沉降槽呈现宽而浅,漏水量越大,沉降越明显;隧道局部漏水会使隧道纵向沉降不均匀,使得隧道环缝张开,漏水位置越靠近隧道底部,环缝张开量越大,张开量与流量之间成正比,从而验证了隧道漏水与隧道变形耦合发展的机理。

Considering the disaster caused by leakage in different regions of local segment of the tunnel in water-rich area, we set up 3-dimensional fluid-solid coupling model to compare and analyze the ground surface settlement and tunnel deformation under different leakage positions and different leakage amount. The results indicate that the lower leakage position causes the smaller of maximum surface settlement, and the wider and shallower surface settlement troughs. With the increase of leakage,the surface settlement becomes obvious. Local tunnel leakage will lead the tunnel longitudinal uneven settlement, enlarging the joint opening of the adjacent segments. The lower leakage position, the greater the joint opening, the open quantity is proportional to the flow. As a result, the mechanism of coupled development between leakage and deformation of tunnel is verified.