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为了探索水力压裂半径的有效考察手段,进行了小尺度煤岩体水力压裂过程视电阻率响应实验。分析了水力压裂过程视电阻率响应原理,建立了水力压裂视电阻率响应实验系统,在此基础上,研究了水力压裂过程煤岩体视电阻率的响应特征规律。研究表明,由于压力水的参与以及煤岩体自身结构的破坏能够引起内部电流场分布状态的改变,引起了煤岩体视电阻率的变化;水力压裂实验中,煤岩体视电阻率具有较好的响应,水力压裂影响区域煤岩体视电阻率会出现显著变小的现象;视电阻率在空间上的分布不是均匀的,试样不同位置的视电阻率在时间上的演化也不是同步的,视电阻率的响应与煤岩体内部裂隙及压力水的分布及演化密切相关。
In order to explore effective means of hydraulic fracturing radius, the experiment of apparent resistivity of hydraulic fracturing in small-scale coal and rock mass was carried out. Based on the principle of apparent resistivity response of hydraulic fracturing, the experimental system of hydraulic resistivity response of hydraulic fracturing is established. On the basis of this, the response law of apparent resistivity of coal and rock mass during hydraulic fracturing is studied. The results show that the change of apparent resistivity of coal and rock mass is caused by the pressure water and the destruction of the self-structure of coal and rock mass. The apparent resistivity of coal and rock mass in hydraulic fracturing experiment has The better response is, the apparent resistivity of coal and rock mass in the affected area of hydraulic fracturing will be significantly smaller; the apparent resistivity in space is not uniform, and the apparent resistivity at different positions of the sample evolves in time The response of apparent resistivity is closely related to the distribution and evolution of internal fractures and pressure water in coal and rock mass.