Engineering geological properties of deep-thick bedded clay around the shaft wall

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.