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花岗岩在高温高压环境下会产生热破裂,强度减小,断裂韧度降低。研究不同温度条件下冲击回转凿岩规律具有重要意义,可以为设计地热开采的新型钻探方法提供理论依据。利用中国矿业大学的“20 MN伺服控制高温高压岩体三轴试验机”、大尺寸(φ200 mm×400 mm)花岗岩试样研究了花岗岩在高温高压状态下的冲击旋转破岩规律。得出以下结论:①在高围压状态下,随着温度升高,花岗岩的强度逐渐降低,冲击旋转钻进速度随之逐渐增大;②在高围压状态,冲击旋转破岩的单位破岩能耗随着温度升高而降低,凿岩效率明显提高;③在高温高压环境下,在一定钻压和冲击功率范围内,凿岩速度随着钻压或冲击功率的增大而增大,单位破岩能耗基本随着钻压的增大而减小。
Granite in the high temperature and pressure environment will produce thermal cracking, strength decreases, fracture toughness decreased. It is of great significance to study the rule of impact rotary rock drilling under different temperature conditions and provide a theoretical basis for designing a new type of drilling method for geothermal mining. Using the “20 MN servo controlled high temperature and high pressure rock mass triaxial testing machine” of China University of Mining and Technology, large-size (φ200 mm × 400 mm) granite samples were used to study the impact-breaking and breaking laws of granite under high temperature and high pressure. The conclusions are as follows: ①When the confining pressure is high, the strength of granite gradually decreases with the increase of temperature, and the rate of impact rotation drilling increases with the increase of temperature; ②Under high confining pressure, The rock energy consumption decreases with the increase of temperature and the efficiency of rock drilling obviously increases; ③ The rock drilling speed increases with the increase of weight-on-bit or impact under certain conditions of weight-on-bit and impact at high temperature and high pressure, , Unit rock breaking energy consumption decreases with the increase of bit weight.