中文摘要：

在采空区上方修建铁路隧道时,隧道围岩的稳定性与地下采空区必然产生相互影响。针对某铁路隧道下伏采空区的实际情况,采用FLAC3D数值分析平台,对隧道围岩变形和采空区治理措施进行模拟分析。模拟结果表明,与无下伏采空区情况相比,下伏采空区的存在对隧道拱顶部位围岩沉降量及水平应力影响较大,大小分别由18.00 mm、3.50 MPa增大到30.75 mm和4.00 MPa,增幅分别约为71%和15%,模拟得到的结果与工程中实际存在的情况基本吻合;同时提出的采空区隧道综合治理方案是可行的,可以取得良好的治理效果,位移沉降量降幅达到了40%,可为类似工程提供参考。

英文摘要：

The stability of surrounding rocks and the underground goafs will be inevitably influenced by each other when railway tunnels locate above goafs. Based on the numerical analysis platform FLAC3 D,a tunnel model with lower stratum of goaf and its treatment were simulated and analyzed,respectively. The simulation results show that the goaf has a large influence on the deformation stability and horizontal stresses of the tunnel＇s top arch surrounding rocks,which increases their values from 15 mm and 3. 50 MPa to 30. 75 mm and 4. 00 MPa with the amplitudes of 71 percent and 15 percent,respectively. And the simulation results are basically identical to the measured results.Furthermore,the simulation results also show that the comprehensive treatment proposed is feasibleto the tunnel and a good treatment effect can be obtained,and that the settlement displacement decreases 40 percent,which provides a valuable reference for later similar engineering.