杜瑞锋, 裴向军, 张晓超, 贾俊, 陈俊宇. 2019: 泥质砂岩在循环荷载作用下能量响应规律的试验研究. 工程地质学报, 27(3): 505-515. DOI: 10.13544/j.cnki.jeg.2018-261
    引用本文: 杜瑞锋, 裴向军, 张晓超, 贾俊, 陈俊宇. 2019: 泥质砂岩在循环荷载作用下能量响应规律的试验研究. 工程地质学报, 27(3): 505-515. DOI: 10.13544/j.cnki.jeg.2018-261
    DU Ruifeng, PEI Xiangjun, ZHANG Xiaochao, JIA Jun, CHEN Junyu. 2019: EXPERIMENTAL STUDY ON ENERGY RESPONSE OF ARGILLACEOUS SANDSTONE UNDER CYCLIC LOADING. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 505-515. DOI: 10.13544/j.cnki.jeg.2018-261
    Citation: DU Ruifeng, PEI Xiangjun, ZHANG Xiaochao, JIA Jun, CHEN Junyu. 2019: EXPERIMENTAL STUDY ON ENERGY RESPONSE OF ARGILLACEOUS SANDSTONE UNDER CYCLIC LOADING. JOURNAL OF ENGINEERING GEOLOGY, 27(3): 505-515. DOI: 10.13544/j.cnki.jeg.2018-261

    泥质砂岩在循环荷载作用下能量响应规律的试验研究

    EXPERIMENTAL STUDY ON ENERGY RESPONSE OF ARGILLACEOUS SANDSTONE UNDER CYCLIC LOADING

    • 摘要: 目前应用能量原理研究岩体结构的破坏、变形及稳定性是岩石力学领域研究的重点。为了研究泥质砂岩在循环荷载作用下3类能量——单位体积能、单位体积弹性能和单位体积耗散能的响应规律,开展了考虑动应力频率、围压和动应力幅值影响的循环加卸载试验。试验结果表明,3类能量在同一频率、不同围压下具有相同的能量响应规律。随着频率的增加,单位体积能、单位体积弹性能和单位体积耗散能随循环次数的响应规律呈现出有规律的波动性;累计单位体积能和单位体积弹性能随循环次数近似线性发展,而累计耗散能呈现出更强的非线性特点。采用了能量速率指标来衡量3类能量的变化程度,频率越高,3类能量的变化速率越大。在能量速率-时间曲线中存在明显的突变点,初步分析为岩样内部或表面裂缝发展的阈值点。通过对影响耗散能的因素分析可知,耗散能与围压、动应力频率和动应力幅值之间均为正增长趋势。结合相关文献的分析结果,综合分析了从循环开始到岩石最终破坏之间全部周期内的3类能量的响应规律,阐明了岩样在循环荷载作用下的能量响应规律,有助于深化对泥质砂岩能量响应规律、损伤及破坏的认识,为应用能量原理分析岩体工程的稳定性提供试验依据和应用指导。

       

      Abstract: At present, the application of energy principle to study the failure, deformation and stability of rock mass is the focus of rock mechanics research. This paper aims to study the response laws of three kinds of energy of argillaceous sandstone. They are the volumetric energy per unit, the volumetric elastic energy per unit and the volumetric dissipated energy per unit under cyclic loading. The loading and unloading test is carried out considering different frequencies, confining pressures and stress amplitudes. The test results show that the three kinds of energy response to number of cycles have the same performance with different pressures and same frequency. With the increase of frequency, the three kinds of energy response laws to number of cycles show regular volatility. Performance among accumulated volumetric energy, accumulated volumetric elastic energy and number of cycles is approximately linear. The accumulated volumetric dissipated energy is strongly characterized by nonlinearity. The energy rate index is used to measure the degree of energy change. The higher the frequency, the greater the change of the energy rate. There are sudden change points in the curve of volumetric dissipated energy rate versus time, preliminary speculated to be the threshold point for the development of cracks in the inner or surface of the rock sample. Through the analysis of the factors affecting dissipated energy, we can find that the positive increasing trends are shown among confining pressure, frequency, dynamic stress amplitude and dissipated energy respectively. Based on the analysis results of relevant literatures, three kinds of energy response laws are comprehensively analyzed from the beginning of the cycle to the final failure of the rock. The energy response laws of the rock sample under cyclic loading are clarified. It is helpful to deepen the understanding of the energy response law, damage and failure of argillaceous sandstone, and provide experimental basis and application guidance for analyzing the stability of rock mass engineering using energy principle.

       

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