三轴压应力–化学溶液渗透作用下单裂隙花岗岩裂隙开度演化

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Abstract To study the aperture evolution of single fracture in granite under stresses and chemical solution seepage，seepage tests using different chemical solutions were carried out on granite with a single fracture under constant triaxial compressive stress. Ion concentrations of solutions were measured during the seepage tests. Analysis results show that under compression，three processes have effects on the evolution of fracture aperture，i.e. mineral dissolution at fracture contact area，mineral dissolution on free surface and mineral precipitation. The relationship between aperture evolution and contact area ratio was obtained using the 3D scanning data of fracture surface. Based on this，the aperture evolution model of granite with a single fracture under both acid and alkaline solutions seepage was established. Simulation results show good accordance with testing results. The established model can well describe the fracture aperture evolution under chemical solution seepage and stress. It shows that under acid solution seepage，the process of mineral dissolution at fracture contact area dominates aperture evolution；while under alkaline solution，the mineral precipitation also plays an important role.

Key words： rock mechanics fracture aperture compressive stress-chemistry-seepage coupling process fracture topography chemical dissolution precipitation rock with a single fracture

Received: 08 March 2012

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/I9/1869

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