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在施加围压的条件下对7种不同类型的岩石试样进行室内水压致裂实验,测量其破裂压力值。实验采用的岩样为带中空孔的圆柱型试样(试样直径为40mm和62mm)。通过向孔内注水压或在孔内放置可膨胀聚合物套管的方式施加孔压。由胡克围压舱施加围压,围压值控制在45MPa。本文最后对实验所得的破裂压力值与用线弹性断裂力学数值模型计算的理论破裂压力值进行了对比。
Under the confining pressure conditions, seven different types of rock samples were subjected to an in-house hydraulic fracturing test to measure the rupture pressure value. The rock samples used in the experiment were cylindrical specimens with hollow holes (sample diameters of 40 mm and 62 mm). Pore pressure is applied by injecting water into the hole or placing an expandable polymer sleeve in the hole. Suppression confining pressure by the Hoo Wai enclosure, confining pressure control at 45MPa. At the end of this paper, the experimental values of fracture pressure were compared with those of theoretical fracture pressure calculated by linear elastic fracture mechanics numerical model.