Research Progress on Shear Mechanical Properties of Deep High−temperature and High−pressure Rock Mass
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摘要:
深部干热岩地热资源是地热领域发电的清洁可再生主导资源，是一种高温高压、低孔低渗等特性，需要通过热储水压致裂技术进行增渗开采。水压致裂建储过程中，低压注水诱导裂隙网络或原生裂隙发生剪切滑移，促使裂隙在其粗糙面下实现错动支撑是热储增透的主要技术手段之一，其理论基础主要为高温高压岩体剪切力学特性。为阐明高温高压岩体剪切力学行为研究进展，总结了高温高压岩体剪切理论模型研究现状，评述了高温高压岩体剪切物理力学特性和变形破坏规律，讨论了热应力及热冲击效应对岩石微观结构的影响机制，提出了目前高温高压岩体剪切力学特性研究存在的不足，展望了未来对于高温高压岩体剪切物理力学参数温度效应的研究方向，以期国内同行对其有全面的了解和认识。
Abstract:As a clean and renewable dominant resource for power generation in the geothermal field, deep dry hot rock is a premium−quality geothermal rock mass with high−temperature and high−pressure, low porosity and low permeability, it is necessary to carry out seepage−increasing mining through thermal storage water fracturing technology. In the process of hydraulic fracturing and reservoir construction, low−pressure water injection induces shear slip of fracture network or primary fracture, which promotes the fracture to realize dislocation support under its rough surface. It is one of the main technical methods of thermal reservoir permeability enhancement. Its theoretical basis is the shear mechanical properties of high−temperature and high−pressure rock mass. In order to spectify the research progress of shear mechanical behavior of high−temperature and high−pressure rock mass, based on the conventional shear mechanics theory and laboratory test methods, we generalize the research status of shear theoretical model of high temperature and pressure rock mass, introduce the progress of shear test equipment of high temperature and pressure rock mass, comprehensively review the shear physical and mechanical propertie, deformation and failure laws of high−temperature and high−pressure rock mass, summarize and discusse the influence mechanism of thermal stress and thermal shock effect on rock microstructure.
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