黄土地区盾构隧道下穿高铁路基掘进参数优化研究

Study on Optimization of Tunneling Parameters of Shield Tunneling Undercrossing High-Speed Railway Subgrade in Loess Area

为研究黄土地区盾构隧道下穿高铁路基掘进参数对地层的影响,依托西安地铁1号线盾构隧道工程,进行数值模拟分析,研究黄土地区盾构隧道下穿高铁路基施工中盾构土仓压力、注浆压力、注浆量和掘进速度对地层的影响。结果表明:土仓压力增大,地层的竖向位移减小;注浆压力与注浆量的增加会减少地层的沉降变形,但影响较小;盾构掘进速度越大,地层扰动越大,地层沉降越大。本文所研究的盾构掘进参数优化可为黄土地区类似施工提供参考。

In order to study the influence of the excavation parameters of the shield tunneling undercrossing the high-speed railway subgrade in the loess area on the stratum, the numerical simulation analysis is carried out based on the shield tunneling project of Xi’an Metro Line 1 to study the influence of the shield tunneling undercrossing the high-speed railway subgrade in the loess area on the stratum due to the shield tunneling pressure of soil warehouse, grouting pressure, grouting amount and tunneling speed. The numerical results show that the vertical displacement of the stratum decreases with the increase of the silo pressure;the increase of grouting pressure and grouting amount will reduce the settlement deformation of the stratum, but the influence is small;the greater the shield tunneling speed is, the greater the stratum disturbance is, and the greater the stratum settlement is. The optimization of shield tunneling parameters studied in this paper can provide a reference for similar construction in the loess areas.