This article introduces the construction of main shaft freezing methods in Jixi,which takes some measurements and gains better results in order to pass the deep clay layers safely.

Seismic safety evaluation prescribes three patterns of input surfaces for deep soft sites in the work of II.

Discussion on permeability of deep clayey soil;

Numerical simulation on vertical stability critical height of variable cross section drilling shaft in deep alluvium;

Experimental study on high strength composite shaft lining in deep alluvium;

Through the construction example, the paper introduces lectotype problems of underpinning in the pile foundation reinforcement under geological conditions of deep soft soil layer and briefly states the method for correcting a deviation in the frame structure.