基床变形是运营铁路的一项严重的病害。它直接威胁行车安全。这种病害多起因于地表和地下水的排水不良,结合基床的自然条件与列车的荷载作用综合形成的。由于成因复杂,相应的整治方法也较多。封闭法即是其中的一种,封闭法的作用主要是隔离地表水和封闭地下水,以求稳固路基。1978年我段孝北堡路基工区,在咸铜线K120+830～K120+850及 Deformation of the bed is a serious disease in running the railway. It is a direct threat to driving safety. This disease is mostly caused by poor drainage of surface and groundwater, combined with the natural conditions of the bed and train load formed by the integrated. Due to complex causes, the corresponding remediation methods are more. The law of closure is one of them. The function of the law of closure is mainly to isolate the surface water and close the groundwater in order to stabilize the roadbed. In 1978, I section Xiaobo Fort embankment work area, salt and copper line K120 +830 ~ K120 +850 and