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Abstract Based on the theory of fracture mechanics，influence law of rock strength with single fracture，a set of fracture and multiple sets of fractures under the action of temperature stress caused by the temperature field higher than room temperature field is presented quantitatively. In the view of theoretical point，starting from elasticity mechanics，using the analytical method such as equivalent load method and principle of superposition，the thermal stress expression of a single fracture is added to the structural load expression of a single expression in representative volume element(REV). The micro-fracture strength expression of intermittent fractured media，of which crack tip of rock fracture is affected by certain temperature stress，is deduced. The microscale such as fracture length and fracture direction and so on is combined effectively and organically with the macroconditions such as temperature and strength. The strength expression of fractured rock at this stage has been improved. A exploration of new idea which could demonstrate the macro-，micro-levels and consider temperature factor fully and describe rock stability comprehensively is elicited. At last，the relevant experimental results show that the formula established has high reliability.
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Received: 17 June 2011
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2013, Vol. 32 
