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.
中华人民共和国国家能源局. DL-T5057—2009 水工混凝土结构设计规范[S]. 北京：中国电力出版社，2009.(National Energy Administration of People?s Republic of China. DL-T5057—2009 Design specification for hydraulic concrete structures[R]. Beijing：China Electric Power Press，2009.(in Chinese))
<body>Your browse does not support frame!</body>
2012, Vol. 31 
