含瓦斯煤体水力压裂过程中声发射损伤效应的数值模拟研究
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摘要
为了研究煤体水力压裂过程中声发射特征并分析其演化规律,利用具有固液耦合分析功能的有限元软件RFPA2D,创建渗流-应力-损伤耦合模型,对含瓦斯煤体水力压裂过程进行了数值模拟,结果表明:在水力压裂过程中,煤体内部出现声发射现象,声发射事件与煤体内部损伤破坏直接相关,声发射累积量可以反映煤体损伤破坏程度与煤体渗透性变化。通过实时监测水力压裂过程中声发射事件、累积量的演化特征,从整体上反映煤体内部渗透性变化与损伤破坏情况,为声发射监测技术在煤体水力压裂效果评价应用方面提供一定指导。
In order to study the characteristics of acoustic emission in the process of hydraulic fracturing of coal and analyze its evolution law, the finite element software RFPA2 Dwith solid-liquid coupling analysis is used to create the seepage-stress-damage coupling model and the numerical simulation of hydraulic fracturing process of gas-bearing coal is carried out. The results show that the acoustic emission phenomenon and the acoustic emission event are directly related to the internal damage damage in the coal during the hydraulic fracturing process. The acoustic emission accumulation can reflect the damage degree of the coal body and the permeability of the coal variety. Through the real-time monitoring of the characteristics of acoustic emission events and accumulation in the process of hydraulic fracturing, the permeability variation and damage damage of the coal body are reflected as a whole, and the acoustic emission monitoring technology is used to evaluate the hydraulic fracturing effect guiding.
In order to study the characteristics of acoustic emission in the process of hydraulic fracturing of coal and analyze its evolution law, the finite element software RFPA2 Dwith solid-liquid coupling analysis is used to create the seepage-stress-damage coupling model and the numerical simulation of hydraulic fracturing process of gas-bearing coal is carried out. The results show that the acoustic emission phenomenon and the acoustic emission event are directly related to the internal damage damage in the coal during the hydraulic fracturing process. The acoustic emission accumulation can reflect the damage degree of the coal body and the permeability of the coal variety. Through the real-time monitoring of the characteristics of acoustic emission events and accumulation in the process of hydraulic fracturing, the permeability variation and damage damage of the coal body are reflected as a whole, and the acoustic emission monitoring technology is used to evaluate the hydraulic fracturing effect guiding.
引文
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