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| STUDY OF DYNAMIC PROPERTIES OF SILTSTONE UNDER COUPLING EFFECTS OF TEMPERATURE AND PRESSURE |
| (1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；2. Hunan Provincial Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines，Changsha，Hunan 410083，China) |
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Abstract With the self-developed dynamic disturbance test system coupling with temperature and pressure，laboratory experiments were conducted to investigate the dynamic strength of siltstone under temperatures from 20℃ to 300 ℃ and different axial pressures. The effects of temperature and pressure on the dynamic strength of siltstone are discussed. The results show that：(1) When the temperature is 20 ℃–100 ℃，the dynamic peak strength of siltstone increases with the increase of temperature. However，the strength of siltstone decreases with the increase of temperature during the temperature over 100 ℃. (2) At the same temperature and different axial pressures，the dynamic strength of siltstone increases rapidly with the increase of axial pressure initially. When the axial pressure is up to 45 MPa，the dynamic strength decreases with the increase of axial pressure. And the higher the axial pressure is，the larger impact failure strength decrease is.
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Received: 01 July 2010
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2010, Vol. 29 
