SHENG Qian, HUANG Zheng-jia, WU Ai-qing. Stability analysis for random key block of underground
power house of Three Gorges Project[J]. 2002, 23(6).DOI:
With the block theory and orthogonal design method
the type and geometrical characterstics and stability of random key block in underground power house of the Three Gorges project are analysed. It is showed that the depth of key block in rockmass is possible to have 7-8 m although the stability of random key block in the underground power house is better; and that the embedded length of system bolts shall be greater than 7 m so as to guarantee the stability of rockmass.