摘要 ：研究目的 ：近年来，水压力作用下隧道底部结构裂损病害时有出现，严重影响隧道运营安全。本文以水 压力作用下某仰拱填充结构开裂病害隧道为例，采用数值模拟和现场实测的方法，研究案例隧道仰拱填充结 构开裂机理，并提出该类隧道病害的整治措施。研究结论 ：(1)水压力作用下，仰拱填充结构裂缝上宽下窄，呈“V”字型，仰拱填充面出现中间上抬、两侧 下沉现象，裂缝主要出现在仰拱填充面隧道中心线附近，沿隧道中心线分布，在边墙附近未见裂缝；（2)该隧 道仰拱水压力最大值，数值计算和现场测试结果分别为0. 213 MPa、0. 2 MPa;(3)若只考虑围岩压力，不会导 致仰拱填充结构出现裂缝;若考虑围岩压力与水压力共同作用，最大主应力极值出现在填充结构上部靠近隧 道轴线位置，为拉应力，且最大主应力极值会大于素混凝土的极限抗拉强度，会产生拉裂缝；（4)在既有隧道 仰拱水压力较大段落，可采取在仰拱及填充结构中配筋、刚性袖阀管注浆加固基底，并对隧底地下水进行排导 的综合整治措施；（5)该案例隧道仰拱填充结构开裂病害经整治后，由近几年的情况来看，本文提出的整治措 施效果良好，可供类似的病害隧道整治参考。

Abstract ： Research purposes ： In recent years，the cracks in the Yottomof the tunnel under the action of water pressure frequently appear，which seriously affect tlie safety of tunnel operation. In this paper，taking a tunnel as an example， the cracking mechanism of invert filling structure of tunnel is studied by numerical simulation and field measurement， and the corresponding measures of disease controlling are put forward. Research conclusions ：( 1) Under the action of water pressure， the filling structure cracks are 11 V" shape， and the cracks mainly appear in the center line of the tunnel， there is no crack near the side wall. (2) The numerical calculation and field test results of the maximum water pressure of the tunnel invert water pressure are 0. 213 MPa and 0. 2 MPa respectively. (3) If only the surrounding rock pressure is considered，the crack will not appear in the invert filling structure. Considering the interaction of surrounding rock pressure and water pressure， the maximum principal stress values will appear in the upper of invert filling structure，and the maximum principal stress values will be greater than the ultimate tensile strengtli of plain concrete, which will produce tensile cracks. (4) In the regulation of similar diseases in tunnel engineering, following measures can be taken： in the fill and the invert filling structure reinforced， rigid sleeve valve pipe grouting improve basement, between invert and surrounding rock setting groundwater drainage system and so on. (5) After several years of observation，the results of the regulation measures proposed in this paper are good and can provide reference for similar tunnel diseases.