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| Exploration on the Modification of Grades of Surrounding Rock of a Railway Tunnel with Highland Stress and High Water Pressure |
| GAN Kun-rong |
| Science and Technology Research Institute, China Railway Tunnel Group Co., Ltd., Luoyang, Henan 471009, China |
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Abstract Research purposes: A large number of large deep-buried tunnels are to be built for construction of high-speed railways. It is necessary to modify the original grades of some surround rock in the detailed grade determination of the surrounding rock during the construction: The modification of the highland stress and high water pressure is the dominant content of the modification.
Research results: The basic grades of surrounding rock under high water pressures can be modified by adopting [Q]=[BQ] Jw(Jw=0.1~0.05). Serious grade differences may occur near the standard values in the determination of the grades of the ground stresses on the basis of TB method. Doing researches on the in-situ ground stress assessment and in-situ acquisition technology are an effective means for the modification of the ground stress in the grade determination of the surrounding rock in the construction.
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Received: 17 October 2007
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2008, Vol. 25 
