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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.
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Received: 29 November 2011
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2012, Vol. 31 
