科研之友
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摘要
Unloading is a quite common phenomenon in the excavation process of large underground caverns, but the formed unloading region in the surrounding rock will bring an extremely adverse effect on the system stability. At present, correlation studies mainly focus on the distribution of the stress field and the displacement field after the excavation completed. However, studies that specifically test the fracturing process with the rock properties weakening during the excavation process are rare. Considering the above reasons and based on the damage mechanics theory, this paper established a numerical model used to analyse the damage-fracturing process of surrounding rock mass, with the nonuniformity properties of rock materials explicitly considered. Taking the underground caverns of Jinping Hydropower Station as the study object, the evolution of the unloading region was simulated dynamically during the excavation process, and good simulating results were presented. In sum, the study findings point out that the developed numerical model is not only applicable to the study of the fracturing mechanism of surrounding rock mass, but also can be used as a new method to analyse problems related to underground caverns excavation.
- 出版日期2013-10-1
- 单位河海大学
