高温与冻融共同作用后类岩石力学性能的试验研究

EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES OF ROCK LIKE AFTER INTERACTION OF HIGH TEMPERATURE AND FREEZE-THAW

为了研究高温和冻融共同作用下对岩石力学特性的影响,对类岩石试件进行高温和冻融作用,然后对试件进行单轴压缩试验,研究高温和冻融作用的先后顺序对试件的抗压强度、峰值应变的影响。结果表明:(1)试件经历各种温度高温作用后,再进行冻融循环作用,随着循环次数的逐渐增加,试件的抗压强度也逐渐降低,试件的峰值应变基本呈逐渐增加的趋势。(2)试件经历冻融循环后、再经高温作用,强度均随着高温温度的增加而逐渐降低,峰值应变随着高温温度的增加基本呈逐渐增加的趋势。(3)先经冻融循环25次、再经高温作用的强度,比先经高温作用、再经冻融循环25次作用的强度高。

In order to study the influence of high temperature and freeze-thaw on the mechanical properties of rock, the rock-like specimens were subjected to high temperature and freeze-thaw, then the specimens were subjected to uniaxial compression test, and the effects of the sequence of high temperature and freeze-thaw cycles on the compressive strength and peak strain of specimens were studied. The results show that:(1) After the specimens are subjected to various high temperature and the freeze-thaw cycles, as the number of freeze-thaw cycles increases, the compressive strength of the specimen gradually decreases, and the peak strain of the specimen gradually increases.(2) After the specimen undergoes the freeze-thaw cycle and then the high temperature, the strength gradually decreases with the increase of the high temperature, and the peak strain gradually increases with the increase of the high temperature.(3) The compressive strength of the specimen after the 25 times cycle freeze-thaw and then the high temperature is higher than that after the high temperature and then the 25 times cycle freeze-thaw.