To investigate the effects of the different conditions of water cooling at high temperature on the tensile strength and split surface roughness characteristics of hot dry rock in the Songliao Basin, the physical characteristics, tensile strength, and split surface roughness of granite under different conditions of water cooling at high temperature were studied. In addition, the relationship between tensile strength and split surface roughness under different conditions of water cooling at high temperature was established. The results showed the following: (1) as the rock temperature increased, the number of water injection cycles increased or the water injection temperature decreased, the mechanical properties of the specimen weakened, and the roughness of the split surface increased. The threshold for the effect of the rock temperature on the split surface roughness of granite was 300°C. At 400°C, the tensile strength greatly decreased. At 600°C, the tensile strength, height mean square error (MSE), fluctuation difference, roughness coefficient, and roughness profile index of the specimen were 0.21, 2.51, 2.57, 8.92, and 1.06 times those at 100°C, respectively. After five heating-cooling cycles, the tensile strength, height MSE, fluctuation difference, roughness coefficient, and roughness profile index of the specimen were 0.57, 1.33, 1.49, 1.29, and 1.01 times those after one cycle, respectively. (2) The roughness angle calculated using the root mean square of the first derivative of the profile was always greater than that derived using the roughness profile index. In addition, the higher the temperature, the lower the water temperature, the more high-temperature-water cooling cycles, the greater the difference between the above two calculations. (3) When the tensile strength varies, the factors affecting the variation in the height MSE and surface roughness were in the following descending order: rock temperature, number of heating-cooling cycles, and water temperature. In addition, the higher the tensile strength, the lower the roughness coefficient. This study is expected to provide a reference for the selection of different conditions of water cooling at high temperature for thermal recovery in the Songliao Basin.

中文翻译：

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不同高温水冷条件对干岩热拉伸强度和劈裂表面粗糙度特性的影响

研究不同温度下水冷条件对松辽盆地干热岩抗张强度和裂隙表面粗糙度特征的影响，以及不同水条件下花岗岩的物理特性，抗张强度和裂隙表面粗糙度的影响。研究了高温下的冷却。此外，建立了在高温水冷条件下，拉伸强度与开裂表面粗糙度之间的关系。结果表明：（1）随着岩石温度的升高，注水循环次数增加或注水温度降低，试样的力学性能减弱，劈裂面粗糙度增大。岩石温度对花岗岩劈裂表面粗糙度影响的阈值为300°C。在400℃下，抗张强度大大降低。在600°C时，样品的拉伸强度，高度均方误差（MSE），波动差异，粗糙度系数和粗糙度轮廓指数分别是100°C时的0.21、2.51、2.57、8.92和1.06倍。经过五个加热-冷却循环，样品的抗张强度，高度MSE，波动差异，粗糙度系数和粗糙度轮廓指数分别是一个循环后的0.57倍，1.33倍，1.49倍，1.29倍和1.01倍。（2）使用轮廓一阶均方根计算的粗糙度角始终大于使用粗糙度轮廓指数得出的粗糙度角。另外，温度越高，水温越低，高温水冷却循环越多，上述两种计算之间的差异就越大。（3）当拉伸强度变化时，影响高度MSE和表面粗糙度变化的因素按以下降序排列：岩石温度，加热-冷却循环次数和水温。另外，抗拉强度越高，粗糙度系数越低。这项研究有望为选择松辽盆地热采的高温水冷不同条件提供参考。影响高度MSE和表面粗糙度变化的因素按以下降序排列：岩石温度，加热-冷却循环次数和水温。另外，抗拉强度越高，粗糙度系数越低。这项研究有望为选择松辽盆地热采的高温水冷不同条件提供参考。影响高度MSE和表面粗糙度变化的因素按以下降序排列：岩石温度，加热-冷却循环次数和水温。另外，抗拉强度越高，粗糙度系数越低。这项研究有望为选择松辽盆地热采的高温水冷不同条件提供参考。