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.

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.

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.

Analyzed coal-bed gas hosting features in Zhongling mine through coalfield geological exploration data,summarized practice and application of both walls of roadway drainage technique,affirmed this technique as effective outburst eliminating measure during anthracite roadway advancing.