某地铁区间隧道冻结施工冻胀效应随机预测分析

Stochastic Prediction for Frost Heave Effect of a Subway Tunnel

土层冻结引发冻胀,引起地面上升和变形,过量的不均匀沉降或变形可能危及周围地面建筑.南京地铁某区间隧道穿过地层为软-流塑状淤泥质粉质粘土,拟采用人工冻结法作为辅助施工方法穿越该不良地段.为对地面建筑物进行变形控制,需要对冻结法施工冻胀效应进行预测.采用随机介质理论对该工程冻结施工的冻胀效应进行预测,介绍了冻胀效应分析的基本过程,编制了计算分析程序,分析了水平冻胀引起的地面隆起、曲率变形规律.结果表明:水平冻胀引起的地面变形均满足地面变形控制要求.

Horizontal freezing induces ground frost heave and ground displacement.Excessive uneven displacement or deformation may damage the surrounding building.The stratum that a Nanjing subway tunnel will traverse through is of soft and silt clay.The artificial freezing construction method is proposed to help the tunnel to traverse through the worse stratum.To control the ground building deformation and displacement due to the ground frost heave,the frost heave effect for the artificial freezing construction shoul...