The essay introduces construction method of anchor-plate retaining combining deep well water-descent in protection around foundation pit of floor underground engineering and steps of rushing to deal with emergency of foundation pit in complex condition.

The meaning and formation of dike piping were explained,the occurrence,development and leakage mechanism of dike piping dangerous condition were analyzed importantly,and reasonable and feasible rescue principle and general rescue measurement were provided,so as to control the piping dangerous condition of dike immediately,ensure the safety of dike engineering.

Consideration and construction of emergency construction of Hongshihe Landslide Dam In Qingchuan County;

This paper discusses the lithology formation of dike and foundation, basing on this, it analyzes the danger causation element of critical engineering,weakly section and puts forward the prevention and danger removement measure.

Against the background of a case study on large diameter slurry shield s break- out around Shanghai area,this paper introduces ground inprovement method around shaft eye,its effects or others,risk prevention measures during shield break-in/-out,as well as option sort-out of ground improvement around launch shaft eye during slurry shield boring of the Changjiang Tunnel in Shanghai.