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| ON FRACTURE STRENGTH OF ROCKS WITH CRACKS UNDER WATER PRESSURE AND CHEMICAL DAMAGE |
| Tang Liansheng',Zhang Pengchen2,Wang Yang3 |
| ('Department of Earth Sciences,Zhongshan Universiy, Guangzhou 510275 China) (Guangzhou Urban Plamning Design and Survey Research Insitute,Guangzhou 510060 China) (China Univerity oMining andTechnology, Beijing 100083 China) |
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Abstract Based on analysis on the effects of water pressure and chemical damage on the stress intensity factor of crack in rocks, a new fracture strength criterion is put forward for the rocks with cracks under water pressure and chemical damage. This new criterion can quantitatively reflect the effects of static water pressure, dynamic water pressure or hydraulic gradient and water chemical damage. The effects ofwater on the fracture strength criterion of rocks with cracks result not only from static or dynamic water pressure of crack in rocks, but also from chemical damage of water on the intemal friction and coherence of crack in rocks. Thus theexpressed formulas in the new fracture strength criterion of rocks correspondto the different cases ofthe crack in rocks with or without closing.
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Received: 22 November 2002
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2003, Vol. 22 
