This paper analyzes the bursting reasons of temporary cofferdam in the cases of typhoon and spring tide from the following aspects, including design of temporary cofferdam, checking calculation after bursting, as well as revised design of sections, and puts forward effective resolution measures, through which, some experience is achieved.

Analyzed the accident phe- nomenon of AHD,reason of the accident and what disposure should we take.

It has analyzed the accident phenomenon of scraper conveyor,reason of the accident and what improvement should we take.

The article introduces the accident course of the surface cracking, sinking and cracks on some walls of a building caused under the pile foundation construction of the deep pit used for a building of Baoji City, analyzes the accident reasons from the aspects of design and construction, and discusses the treatment methods and reasons.

This paper analyses accident reasons from statistical data on the basis of massive deep excavation and slope engineering accident examples,and gets some useful conclutions.

Gray relationship analysis between highway traffic accidents dangerous degree and accident causes;