Abstract: Based on the investigation for more than one hundred shaft walls built in the thick overburden layer in Huanghuai region, the following conclusions have been obtained. Deep-thick bedded clay is the position that frozen-tube and sidewall outside the shaft is easy to fracture during the construction of the frozen shaft wall. However, after the wall has been built, the thick-bedded clay results in enhancement of the strength of shaft wall, and the development of the lateral friction resistance during consolidation of the clay layer too. A great deal of evidence has indicated that deep-thick bedded clay has engineering properties which are high earth pressure, non-frozen, distinct plastic deformation, great lateral resistance.