等幅循环荷载下页岩的变形特性及能量演化机制研究

doi:10.13722/j.cnki.jrme.2020.0451

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摘要在页岩气田开发过程中，围岩总是处于三向高压应力状态，经过水力压裂技术改造完井之后，随高压压裂液的回排，缝内页岩气压力和压裂液压力随之降低，整个过程页岩储层长期遭受循环荷载的影响。对此，为了探究循环荷载下页岩的力学性质，运用RLW–2000型微机伺服岩石三轴试验机，对天然状态页岩在不同围压下进行三轴变上下限等幅循环加卸载实验，分析讨论页岩的变形特性、能量演化机制及阻尼特性。实验结果表明：临近破坏前几个循环，变形模量和泊松比均发生剧烈波动，预示页岩即将失稳破坏；变上下限等幅循环荷载下低围压达到能量弱化阶段的应力比较高围压小，低围压达到能量强化阶段的应力比较高围压大，应力比可作为试件能量转化和分配的阀值点来预判试件变形破坏中的能量强化和弱化过程；最后，阐明了页岩在变上下限等幅循环荷载作用下累积水平能量与应力比关系，揭示了阻尼比随应力比和循环次数变化而演化的规律。

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	蒋长宝1
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	魏财1
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	庄万军3
	段敏克2
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	陈昱霏1
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	余塘1
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关键词 ：岩石力学, 页岩, 变形模量, 泊松比, 能量, 阻尼比

Abstract：During the development of shale gas fields，the surrounding rock is always in a three-way high-pressure state. After the completion of hydraulic fracturing，the pressures of the shale gas in the fracture and the fracturing fluid will decrease along with the backflow of the high-pressure fracturing fluid. The shale reservoir suffers long-term cyclic loading in the whole process. In order to explore the mechanical properties of shale under cyclic loading，triaxial variable upper and lower limit constant amplitude cyclic loading and unloading experiments on natural shale were performed under different confining pressures by using the RLW–2000 microcomputer servo rock triaxial testing machine，and the deformation characteristics，energy evolution mechanism and damping characteristics of shale were analyzed. The experimental results show that the deformation modulus and the Poisson¢s ratio fluctuate drastically in the few cycles near failure，indicating that the shale is about to fail. Under variable upper and lower limit constant amplitude cyclic loads，the stress reaching the stage of energy weakening at a low confining pressure is smaller than that at a high confining pressure，while the stress at the energy-strengthening stage does the opposite. The stress ratio can be used as the threshold point for energy conversion and distribution of the specimen to predict the energy strengthening and weakening process in the deformation and failure of the specimen. Finally，the relationship between the cumulative horizontal energy and the stress ratio of shale under variable upper and lower limit constant amplitude cyclic loads was clarified，and the evolution law of the damping ratio with the stress ratio and the number of cycles was revealed.

Key words： rock mechanics shale deformation modulus Poisson¢ s ratio energy damping ratio

引用本文:

蒋长宝1，2，魏财1，2，庄万军3，段敏克2，4，陈昱霏1，2，余塘1，2. 等幅循环荷载下页岩的变形特性及能量演化机制研究[J]. 岩石力学与工程学报, 2020, 39(12): 2416-2428.
JIANG Changbao1，2，WEI Cai1，2，ZHUANG Wanjun3，DUAN Minke2，4，CHEN Yufei1，2，YU Tang1，2. Research on deformation characteristics and energy evolution mechanisms of shale under constant amplitude cyclic loading. , 2020, 39(12): 2416-2428.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0451 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I12/2416

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