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Energy analysis for damage and catastrophic failure of rocks

Science china(Technological Sciences) 2011年第S1期54卷 199-209页

作者： xie heping 1,2.li liyun 2.1,ju yang 2.peng ruidong 2.& yang yongming 2.1 sichuan university,chengdu 610065,china 2 State Key Laboratory of Coal Resources and Safe Mining,Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete,china university of Mining and Technology,Beijing 100083,china sichuan university Chengdu China State Key Laboratory of Coal Resources and Safe Mining Beijing Key Laboratory of Fracture and Damage Mechanics of Rock and Concrete China University of Mining and Technology Beijing China

The development history and current state of studies on the characteristics and mechanisms of deformation and failure of rock materials were briefly reviewed from the viewpoint of *** main scope and the achievable objectives of the energy-based research system were *** was validated by experiments that the damage process of rocks can be well described by the rock damage evolution equation established based on energy *** was found from the uniaxial compression and biaxial compression tests that only a small proportion of the total input energy in hard rocks is dissipated before peak load and a large proportion in soft rocks is dissipated before peak *** both hard and soft rocks,the energy dissipated after peak load accounts for a greater *** energy would be required for rock failure under equal biaxial compression than under unequal biaxial *** total absorbed energy is different for rock failure under high-rate loading and low-rate *** fragmented failure pattern usually corresponds to higher energy *** mesoscopic analysis on the damage and failure of bedded salt rocks showed that the energy dissipation is prominent and the total absorbed energy for rock failure is low when cracks propagate in the weak mud interlayer while it is contrary when cracks propagate in the salt *** energy accumulation,transfer,dissipation and release during the failure process of tunnel with impending failure under disturbance were analyzed theoretically based on the elastoplastic mechanics ***,the spatial distribution of energy dissipation and energy release of fractured rocks under unloading was simulated *** was demonstrated that energy is likely to be released from the weakest surface under compression,which triggers the global failure of rocks.

关键词： rock deformation failure energy accumulation energy dissipation energy release

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Energy analysis and criteria for structural failure of rocks

引用

Journal of Rock Mechanics and Geotechnical Engineering 2009年第1期1卷 11-20页

作者： heping xie liyun li ruidong peng yang ju sichuan university Chengdu 610065 China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Teehnology Beijing 100083 China

The intrinsic relationships between energy dissipation,energy release,strength and abrupt structural failure are key to understanding the evolution of deformational processes in *** and experimental studies confirm that energy plays an important role in rock deformation and *** energy from external forces produces damage and irreversible deformation within rock and decreases rock strength over *** failure of rocks is caused by an abrupt release of strain energy that manifests as a catastrophic breakdown of the rock under certain *** strain energy released in the rock volume plays a pivotal role in generating this abrupt structural failure in the *** this paper,we propose criteria governing（1） the deterioration of rock strength based on energy dissipation and（2） the abrupt structural failure of rocks based on energy *** critical stresses at the time of abrupt structural failure under various stress states can be determined by these *** an example,the criteria have been used to analyze the failure conditions of surrounding rock of a circular tunnel.

关键词： energy dissipation energy release strength deterioration structural failure breakage size

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