STRENGTH DETERIORATION STUDY OF COAL AND ROCK MASS AFFECTED BY COUPLED-CRACK
CUI Feng1，2，LAI Xingping1，2，CAO Jiantao1，2，SHAN Pengfei1，2
(1. Energy School，Xian University of Science and Technology，Xian，Shaanxi 710054，China；2. Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education，Xian，Shaanxi 710054，China)
To establish therelationship between the scheme of coupled-crack and strength deterioration for the coal and rock mass as the target，the interaction of injection watermeasureand blasting measure are definedas coupled-crack，and the coupled-crack mechanism is analyzed，giving the crack propagation criterion for the implementation of coupled-crack technology. Strength deterioration analysis method of fluid-solid coupling model affected by explosion is put forward. By using numerical simulation method，we establish the modelsfor injecting water and obtaining explosion load，axially load is applied afterfinishing explosion loading，the strength degradation degree of overall model at different coupled-crack schemes is analyzed. The results show that: the essence of coupled-crack is that detonation gas and shock waveformed by explosion spreads in softened coal and rock mass，coupled-crack effect is greater than the simple superposition of basting and injection water；Improve water pressure can increase the strength degradation rate of coal and rock mass，model strengthhas a significantly decreased with the increase of drill diameter(explosion). The relationship between the coupled-crack parameters and strength deterioration degree of f is obtained，the damage degree of coal body caused by injection water pressure of explosiveconsumption is quantitatively evaluated. In engineering practice，the strength of coal mass from steeply dipping extra-thick coal seam after coupled-crackis 5.48 MPa，whichhas a decreased by 40.07%compared with the implementation of injection water. The working face recoveryrate meets the requirements of national standards for thick coal seam，which realizes the objective of improving the top coal recoveryrate，providing experiment method andbasis for the quantitative evaluation of coupled-crack effect.
崔 峰1，2，来兴平1，2，曹建涛1，2，单鹏飞1，2. 煤岩体耦合致裂作用下的强度劣化研究[J]. 岩石力学与工程学报, 2015, 34(S2): 3633-3641.
CUI Feng1，2，LAI Xingping1，2，CAO Jiantao1，2，SHAN Pengfei1，2. STRENGTH DETERIORATION STUDY OF COAL AND ROCK MASS AFFECTED BY COUPLED-CRACK. , 2015, 34(S2): 3633-3641.
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2015, Vol. 34 
