CAJ | 학술논문

岩石内部结构随温度升高的变化会导致其物理力学性质的改变.利用 MTS 伺服试验机和高温炉进行常温至800℃花岗岩物理力学参数随温度变化特征试验.研究结果表明:(1)岩石物理力学性质随温度变化可划分常温~100℃和100℃~300℃,300℃~500℃,500℃~600℃,600℃~800℃五个阶段;前3个阶段的温度范围分别对应岩石内附着水、结合水和结构水汽化逸出的温度区间.(2)岩石物理力学性质(抗压/抗拉强度,渗透率,波速等)在400℃~600℃的温度范围内会有显著变化;受石英由α相变为β相的影响,岩石体积增大,微裂隙大量增加,在573℃附近存在强度和波速下降的加速点.(3)温度大于600℃后,岩石强度和波速会继续降低,其与固体矿物膨胀和金属键断裂引起矿物熔融破裂及相变有关.
암석내부결구수온도승고적변화회도치기물리역학성질적개변.이용 MTS 사복시험궤화고온로진행상온지800℃화강암물리역학삼수수온도변화특정시험.연구결과표명:(1)암석물리역학성질수온도변화가화분상온~100℃화100℃~300℃,300℃~500℃,500℃~600℃,600℃~800℃오개계단;전3개계단적온도범위분별대응암석내부착수、결합수화결구수기화일출적온도구간.(2)암석물리역학성질(항압/항랍강도,삼투솔,파속등)재400℃~600℃적온도범위내회유현저변화;수석영유α상변위β상적영향,암석체적증대,미렬극대량증가,재573℃부근존재강도화파속하강적가속점.(3)온도대우600℃후,암석강도화파속회계속강저,기여고체광물팽창화금속건단렬인기광물용융파렬급상변유관.
The change of rock internal microstructure along with temperature increasing leads to the variation of physico-mechanical properties. The experiments on physico-mechanical properties evolution of granite were carried out at temperature ranging from room temperature to 800 ℃ by using MTS servo-controlled testing machine and heating furnace. The research results indicate that:(1) The rock physico-mechanical properties change with temperature can be divided into five stages:i.e. room temperature to 100 ℃,100 ℃ to 300 ℃, 300 ℃ to 500 ℃,500 ℃ to 600 ℃ and 600 ℃ to 800 ℃. The first three stages of temperature range correspond to the vaporization escaping interval of adhered water,and bound water and structural water. (2) The phsyico-mechanical parameters of rock have larger changes in temperature between 400 ℃ to 600 ℃,specially at the temperature of 573 ℃,where quartz has a phase transformation,fromαphase toβphase. In this process, it is leaded to the increase of rock internal microcracks,which can be described as increasing of volume,reducing of bearing capacity,increasing of permeability,and the mutation of wave velocity. (3) After the temperature higher than 600 ℃,rock strength and wave velocity continue to reduce,which is influenced by solid mineral inflation and fracture of metallic bonding.