It is studied that the value of syndrome heat consumption on the wide sectional tunnel kiln relates to the kiln structure and made from materials,and fuel,and the firing curve,combining the prototype with the theoretical calculation.

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;

The development of road needs large-section tunnel badly.

In order to master the mechanical behavior of surrounding rock and lining support in shallow-depth large-section tunnel when tunneling, and provide scientific laws for safty construct in shallow-depth large -section tunnel.

Consequently,the optimum bolts layout scheme of large-section tunnel in weak rock can be obtained at certain class of surrounding rock from the foregoing calculation results.