Based on the actual monitoring data of the diaphragm wall support structure in circular deep foundation pit,authors analyze the change law and the deformation mechanism of the lateral displacement of diaphragm wall during excavation.

Numerical simulation of constructing the huge deep foundation pit by artificially frozen ground method;

This paper introduced practical construction of retaining and protecting engineering of super deep circle-foundation pit using compound reverse construction method,make use of drilled pile,rock bolt and chemical churning pile to retain and protect,make use of controlled blasting method to cut rock in the pit.