The anti-slippery function contrastable examination of more than 300 kiiometerses demonstrates that there is good relativity between the method of laser cross section instrument and the method of handmade spreading.

This paper introduces the operation principle, hardware and software of a new portable laser measuring instrument of tunnel section developed using a phillips 87C552 single chip microcomputer.

Taking for example of the excavation Pansteel Baima iron ore mine,the construction method and precautions for large section tunnel in fracture weak strata were introduced.

This paper is based on the construction of linjiangmen station tunnel of the Chongqing Jiaoxin Light Railway, the demolition shock absorption applied to urban shallow covered large section tunnel in hard rocks under complicated conditions is introduced.

The numerical simulation of constructional mechanical responses of highway tunnel with large cross section;