中文摘要：

为研究单裂隙花岗岩在应力–化学溶液渗透条件下的开度演化规律,开展单裂隙花岗岩在恒定三轴压应力及化学溶液渗透作用下的试验。对试验过程中渗透溶液离子浓度进行分析,结果表明,压应力作用下,裂隙接触面矿物溶解、自由面矿物溶解以及矿物沉淀3个过程影响裂隙开度的演化规律。通过裂隙面三维扫描数据获取裂隙开度变化与接触面积率的关系,并基于此在已有研究基础上分别建立酸性溶液和碱性溶液渗透作用下花岗岩裂隙开度演化模型。模拟结果表明,模型计算结果与试验结果符合较好,能够很好地描述裂隙在化学溶液渗透和应力作用下的演化规律;酸性溶液渗透作用下,接触面矿物溶解过程的强弱控制着裂隙开度的演化,而碱性溶液渗透作用下,矿物的沉淀过程也发挥着重要作用。

英文摘要：

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.