Abstract：Anchor cables supporting is one of the most leading measures for underground caverns，and it is fundamental to ensure the stability of surrounding rock mass. According to the practice of rock anchor cable to support side walls of underground powerhouse at Jinping I hydropower station，the design of anchor cables supporting and the statistical results on overloading of anchor cables are introduced，and the factors to cause this phenomenon as well as the measures to reduce the load are studied. The formulas to verify design proposal are also given，and the formula to compute stress of unbounded prestressed anchor cables of pressure dispersion style with more anchor heads is derived. These formulas and measures are used to verify design proposal，and evaluate safety of overloading cables.
周 钟，汤雪峰，廖成刚，等. 锦屏一级水电站地下厂房洞室群围岩变形破坏机制及加固措施研究专题报告[R]. 成都：中国水电工程顾问集团公司成都勘测设计研究院，2009.(ZHOU Zhong，TANG Xuefeng，LIAO Chenggang，et al. Report on surrounding rock mass deformation and support research of the underground powerhouse caverns of Jinping I hydropower station[R]. Chengdu：HydrChina Chengdu Engineering Corporation，2009.(in Chinese))
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2012, Vol. 31 
