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| Exploration on Control Method for Deformation of Stressed Highland Weak Surrounding Rock |
| WANG Bing-di |
| Wushaoling Tunnel Project Headquarter of the Fifth Engineering Bureau of Chinese Railway Gulang, Gansu 733100, China |
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Abstract Research purposes: The purposes were to make exploration on control method for big deformation of stressed highland weak surrounding rock and to monitor measure and demonstrate the method on site through concrete construction practice.
Research methods: The brief analysis of distance relation between critical failure spot of support, quality of surrounding rock, allowable amount of deformation, deformation rate working procedure of transportation way was made according to the geological characteristics and its deformation characteristics of stressed highland weak surrounding rock at the largest fault P7 of Wushaoling Tunnel. Concretely speaking, the exploration was made on three aspects of geologic advance forecast, tunnel support structure and construction method.
Research results: The basic method for defining the distance between support parameters and working procedure, experience parameters and basic requirement for tunnel construction were obtained under condition of stressed highland weak surrounding rock, and the suggestions and measures were put forward to the points for attention in tunnel construction.
Research conclusions: The support parameters and construction method should be adjusted on time according to the changeable situation of surrounding rock on working face when construction was conducted under condition of stressed weak surrounding rock. In this way, the deformation could be controlled effectively.
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Received: 28 November 2005
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2006, Vol. 23 
