温度-应力耦合作用对花岗岩渗透性的影响

Effect of Temperature-Stress Coupling on Granite Permeability

为了研究高温热处理对花岗岩渗透性的影响,文章对巴西劈裂试验后的花岗岩试样进行渗透性试验。研究结果表明:高温处理后经过巴西劈裂试验的花岗岩试样渗透率呈大幅度减小趋势,25℃时花岗岩渗透率最大,高温导致花岗岩内部绝对孔隙压缩,内部结构致密度增大,600℃时花岗岩渗透率最小,在渗透压从2MPa加载至10MPa时花岗岩渗透率降低速率最快,当渗透压由10MPa加载至50MPa之后,各温度阶段花岗岩渗透率降低速率均减小,不同温度对花岗岩的渗透性有着不同程度的劣化作用,为实际工程概况提供参考。

In order to study the effect of high temperature heat treatment on the permeability of granite,this paper conducts permeability tests on granite samples after Brazil splitting test.The research results show that the permeability of the granite samples subjected to the Brazilian split test after high temperature treatment shows a significant decrease trend.The permeability of granite is the largest at 25℃.The high temperature causes the absolute pore compression in the granite and the density of the internal structure increases,the permeability of granite is the smallest at 600℃,the permeability of granite decreases fastest when the seepage pressure is loaded from 2MPa to 10MPa.When the seepage pressure is loaded from 10MPa to 50MPa,the permeability of granite decreases at each temperature stage.Different temperatures have different degrees of deterioration of the permeability of granite,which provides a reference for the actual project overview.