期刊
ROCK MECHANICS AND ROCK ENGINEERING
卷 47, 期 6, 页码 2211-2223出版社
SPRINGER WIEN
DOI: 10.1007/s00603-014-0599-4
关键词
Underground group cavities; High stress; Brittle rock mass; Splitting criterion; Opening displacement; Displacement forecasting
资金
- National Natural Science Foundation of China [41372294, 41002098, 41102184]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT13075]
- Shandong Province Transportation Science and Technology Project [2008Y002]
- China Scholarship Council
Splitting failure, which is recognized as a special engineering geology phenomenon, occurs continually in the brittle rock mass of caverns during underground excavation. In this paper, a splitting model of linear slippage crack groups is built with fracture mechanics, energy analysis, and crack extension theories. Considering intrinsic cracks in rock mass and change of outer stress, intrinsic cracks propagate into macroscopical splitting cracks that are approximately parallel to the side wall of caverns. The splitting criterion of cavern rock mass and the method for predicting displacement in view of splitting opening displacement are proposed. In the end, the forecasting method is applied to the Jinping-I Hydropower Station, underground caverns engineering in China, the splitting failure zone and forecasting displacement are accordant with the monitoring data. The new forecasting displacement method is proven to contribute to the construction of similar underground caverns.
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