冻融循环条件下英安岩的物理力学特性试验研究

通过模拟高寒地区自然条件,对西藏某电站坝址英安岩进行饱水条件下冻融循环试验、电镜扫描试验和单轴、三轴抗压强度试验。通过对冻融循环条件下英安岩的物理特性(质量变化、声波变化、微观裂隙发展)和力学特性的研究,发现冻融循环作用会导致岩石内部裂隙扩展和颗粒析出,且后者劣化程度明显弱于前者,但最终均趋于稳定;同时,随冻融循环次数的增加,岩石强度参数值逐渐减小、抗冻性减弱,而围压的增加却能够弱化冻融循环对英安岩的损伤。

Experimental study on physical and mechanical properties of rock under the condition of freeze-thaw cycles

By simulating the natural condition of the alpine region, a power station in Tibet dam dacite were saturated under freeze-thaw cycle test and SEM test and uniaxial compressive strength test, three axis. The physical characteristics of the freeze-thaw cycle under the condition of dacite (mass change, sound change, research and development of micro cracks) mechanical properties, found that freeze-thaw cycles will lead to internal rock expansion and particle precipitation, and the degree of degradation was significantly weaker than the former, but eventually tends to be stable; at the same time, with the increase in the number of freeze-thaw cycles, the rock strength parameters decrease, frost resistance decreased, while the increase in confining pressure can weaken the freeze-thaw cycle of dacite damage.