Application of key block theory and DDA to the stability analysis of Underground Powerhouseof Jinping Hydropower Station I
The underground powerhouse of Jinping Hydropower Station I is large in scale and deeply buried in green marble and green schist with high in situ stress. The surrounding rock mainly belongs to Ⅲ 1 and it has 4 groups of fissures and 2 sets of faults. The severely disked rock cores and rib-spallings in drilling hole indicate the plant is in high in situ stress area. In this paper, the key block theory and DDA are adopted for the stability analysis of the underground powerhouse of Jinping Hydropower Station I . At first, the key blocks and its influence to the stability of the cavity are identified by key block theory. Then the displacement and the damage condition are examined by DDA. The calculation results show that the key blocks mainly lay on the roof in huge volume. They are dense in upstream side in small volume and bare in downstream side, and there just a few lying on the middle of the downstream wall. After excavation the roof collapsed seriously, and the wall on both sides damaged, especially in the downstream. After installation of bolt reinforcement, the number of falling blocks reduced significantly. The result shows that applying key block theory and DDA together is helpful to understand the damage mechanism of the underground rock wall and check the validity of the reinforcement.
Key Block Theory DDA Underground powerhouse High stress Stability analysis
CHEN WEN DENG JIAN-HUI
Sichuan University, P.R.CHINA
国际会议
北京
英文
243-247
2007-08-14（万方平台首次上网日期，不代表论文的发表时间）