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三轴低频循环荷载下盐岩体积应变特性研究

许宏发, 王晨, 马林建, 董璐

许宏发, 王晨, 马林建, 董璐. 三轴低频循环荷载下盐岩体积应变特性研究[J]. 岩土工程学报, 2015, 37(4): 741-746. DOI: 10.11779/CJGE201504021
引用本文: 许宏发, 王晨, 马林建, 董璐. 三轴低频循环荷载下盐岩体积应变特性研究[J]. 岩土工程学报, 2015, 37(4): 741-746. DOI: 10.11779/CJGE201504021
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XU Hong-fa, WANG Chen, MA Lin-jian, DONG Lu. Volumetric strain of rock salt under triaxial low-frequency cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 741-746. DOI: 10.11779/CJGE201504021
Citation: XU Hong-fa, WANG Chen, MA Lin-jian, DONG Lu. Volumetric strain of rock salt under triaxial low-frequency cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(4): 741-746. DOI: 10.11779/CJGE201504021
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三轴低频循环荷载下盐岩体积应变特性研究  English Version

  • 1. 解放军理工大学国防工程学院爆炸冲击防灾减灾国家重点试验室,江苏 南京 210007; 2. 中国矿业大学深部岩土力学与地下工程国家重点试验室,江苏 徐州 221116）项目（BK20130065）;中国矿业大学深部岩土大学与地下工程国家重

基金项目: 国家青年科学基金项目（51309234）; 江苏省青年科学基金; 点实验开放基金项目（SKLGDUEK1403）
详细信息
    作者简介:

    许宏发（1964- ）,男,江苏泰州人,博士,教授,博士生导师,主要从事岩土工程和地下防护工程方面的教学与研究工作。E-mail: xuhongfa@163.com。

Volumetric strain of rock salt under triaxial low-frequency cyclic loading

  • 1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Institute of National Defense Engineering, PLA University of Science and Technology, Nanjing 210007, China; 2. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

摘要

    摘要
  • 摘要: 地下储气库围岩长期处于复杂疲劳应力状态下,盐岩三轴循环荷载下的变形规律对储气库稳定性分析有参考价值。对8个盐岩试块进行了不同围压、不同应力水平和不同频率条件下的循环荷载试验。对每一试块施加恒定围压和轴向低频循环荷载。对试验参数进行了无量纲处理,分析了应力比强度（广义剪应力强度与球应力的比值）、应力比振幅、上限应力水平、荷载频率、循环次数（N）等对体积应变（εv）的影响。利用函数εv=λlgN+εv0,对每一试块的体积应变-循环次数曲线进行了拟合分析,获得了参数λ和εv0随应力比振幅、上限应力水平和频率变化的数学表达式。标准化回归系数分析表明,上限应力水平是影响盐岩体积变形的主要因素,其次是应力比振幅。在高上限应力水平三轴状态下,盐岩主要表现出体积扩大现象。
    Abstract: The surrounding rock salt of underground gas storage cavern is subjected to long-term triaxial fatigue stress. The deformation property of rock salt under triaxial cyclic loading is of great importance to the stability of the rock salt cavity. A series of laboratory tests are performed to explore the deformation behavior of eight rock salt specimens under various confining pressures, stress levels and loading frequencies. The axial low-frequency cyclic stress is applied on each salt specimen while the confining pressure is kept steady. The test parameters are processed by the dimensionless method. The effects of the strength of stress ratio (ratio of generalized shear strength to spherical stress), amplitude of stress ratio, level of the maximum stress, loading frequency and loading cycles (N) on the volumetric strain (εv) of rock salt are analyzed. The nonlinear curve fitting is carried out using the function εv =λlgN+εv0 for a curve of each specimen on the volumetric strain with the cycles. Further, the expressions for the parameters λ and εv0 with the amplitude of stress ratio, the maximum stress and loading frequency are obtained, respectively. The analysis of standardization regression coefficient indicates that the maximum stress is the key factor that influences the volumetric deformation of rock salt, and the stress amplitude ratio comes the second. It is noted that the rock salt exhibits dilatancy under high maximum stress.
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    • 参考文献(17)
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  • 收稿日期:  2014-01-12
  • 发布日期:  2015-05-05

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