温压耦合作用下的粉砂岩动态力学特性试验研究

采用自行研制的温压耦合及动力扰动试验系统,对20℃～300℃和不同轴向静压作用下粉砂岩的动态强度进行室内试验研究,讨论温度和压力对岩石动态强度变化规律的影响。研究结果表明:(1)在20℃～100℃范围内粉砂岩动态峰值强度随温度升高而上升,当温度超过100℃后,随温度升高而下降;(2)当温度相同时,对岩石施加不同轴向静压,粉砂岩的冲击破坏强度首先随轴向静压增大而迅速提高,但当轴向静应力达到约45MPa后,冲击破坏强度反而随轴向静压上升而下降,且轴向静压越大岩石冲击破坏强度降低幅度越大。

STUDY OF DYNAMIC PROPERTIES OF SILTSTONE UNDER COUPLING EFFECTS OF TEMPERATURE AND PRESSURE

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.