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选取PKN模型进行岩体裂隙地热水对流换热量的研究,计算了地热水在裂隙内的对流换热量,通过将裂隙截面展开求解对流换热面积,根据牛顿冷却定律计算得出对流换热量;由裂隙张开度的变化量计算岩体裂隙的渗流量,结果表明,在三维应力一定的条件下,岩体裂隙内地热水的渗流量随裂隙倾角变化而变化。从矿山中选取典型岩样进行加工,使之成为200 mm×100 mm×200 mm的标准岩样。试验结果表明,在裂隙倾角α=0°的情况下,裂缝的渗流量随β增加逐渐减小,并且在随β增加到90°的过程中趋于稳定,表明岩体裂缝为水平裂缝时渗流量最小,维持在一个稳定值;在α=90°的情况下,裂缝的渗流量随β增加逐渐增大,在β增加到90°的过程中,裂缝慢慢变为垂直裂缝,渗流量的变化也趋于缓和,增加到一个稳定值。
The PKN model was used to study the convective heat transfer of geothermal water in rock fissures. The convective heat transfer of geothermal water in the fissures was calculated. The convection heat transfer area was solved by expanding the cross-section of fissures and convection was calculated according to Newton’s cooling law The results show that the seepage flux of hot water in rock mass fissures changes with the change of fissure angle under certain three-dimensional stress. Select typical rock samples from the mine for processing to make it a standard sample of 200 mm × 100 mm × 200 mm. The experimental results show that the seepage flux of fractures decreases gradually with the increase of β at the crack inclination of α = 0 ° and stabilizes with the increase of β to 90 °, indicating that when the fractures of rock mass are horizontal fractures At the condition of α = 90 °, the seepage flux of fractures gradually increases with the increase of β, and gradually increases to 90 °, the fractures gradually become vertical fractures, and the seepage flux Changes also tend to ease, adding to a stable value.