At present, with the constant growth of the underground construction in our country, we should deal with the surveying of tunnel contour in the control of railway, pavement, water conservancy, water and electricity, mine.

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.

This paper describes an application of the TM tunnel section measurement system as an advanced tunnel section measurement system,in the No.

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;