二水石膏围压下轴向加载速率效应及能量耗散机制#br#

doi:10.13722/j.cnki.jrme.2020.0031

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摘要开展不同加载速率下石膏力学特性演化试验研究，对探讨石膏矿山采空区失稳破坏和精细化处理有着重要理论研究意义。在围压10 MPa下，进行不同加载速率的三轴压缩试验，研究不同加载速率下对二水石膏物理力学性质影响，深入分析加载速率对能量积累的影响及能量演化规律。结果表明：石膏试样破坏形式为剪切破坏，随着加载速率的增加，石膏试样的峰值强度和弹性模量都呈增大趋势；试样在加载后期并没有发生明显应力跌落现象，而是保持一定应力值不变；当加载速率大于0.04 mm/min时，到达峰值出现应力屈服，应力表现出增–减–稳的变化趋势，说明石膏试样在高加载速率下通过内部结构调整，释放应变能，试样内部的损伤加剧；塑性阶段，石膏试样耗散能逐渐超过弹性能，峰值过后，耗散能迅速增加，总能量主要转化为耗散能成为主要分配方式，峰值后压力机产生的总能量主要被试样剪切面之间的摩擦吸收；轴向应变= 0.01时，随着加载速率的增加总能量和耗散能有增加的趋势，弹性能减小；加载速率越高，石膏试样滑移面的剪切角度越大，破坏程度越高，与其对应的耗散能量呈正相关关系，峰后耗散能大小是决定石膏试样剪切破坏程度的本质因素。

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	李东1
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关键词 ：岩石力学, 石膏, 应力&ndash, 应变, 能量, 储能极限, 剪切破坏

Abstract：Implementing an experimental research on the evolution of gypsum mechanical characteristics at different loading rates has great theoretical research significance for the study of instability and failure of goaf as well as refinement treatment in gypsum mines. At a confining pressure of 10 MPa，triaxial compression tests of gypsum at different loading rates are implemented to study the effects of the loading rate on the physical and mechanical characteristics of dihydrate gypsum as well as energy accumulation，and to deeply analyze the law of energy evolution. The results show that the failure mode of gypsum samples is shear failure. Both the peak strength and the elastic modulus of the gypsum sample increase with increasing the loading rate，and the sample maintains a constant stress value without an obvious stress drop in the late stage of loading. When the loading rate is greater than 0.04 mm/min，the stress yield occurs at the peak value and the stress shows an increasing- decreasing-stabilizing trend，which shows that，at a high loading rate，the gypsum sample adjusts the internal structure to release strain energy and exacerbates the internal damage of the sample. The dissipated energy of the gypsum sample exceeds the elastic energy gradually in the plastic stage. After the peak stress，the dissipated energy increases rapidly，and the total energy is mainly transformed into the dissipated energy which becomes the main distribution mode. The total energy generated by the press machine after the peak value is mainly absorbed by the friction between the shear planes of the sample. When the axial strain is 0.01，the total energy and the dissipated energy tend to increase with increasing the loading rate while the elastic energy decreases. the higher the loading rate is，the larger the shear angle of the sliding surface of the gypsum sample is，and the higher the degree of failure is，which has a positive relation with the corresponding dissipated energy. The dissipation energy after the peak is the essential factor that determines the degree of shear failure of the gypsum sample.

Key words： rock mechanics gypsum stress-strain energy energy storage limitation shear failure

引用本文:

李东1，任高峰1，2，柯波1，2，张聪瑞1，2. 二水石膏围压下轴向加载速率效应及能量耗散机制#br#[J]. 岩石力学与工程学报, 2020, 39(9): 1883-1892.
LI Dong1，REN Gaofeng1，2，KE Bo1，2，ZHANG Congrui1，2. Loading rate effect and energy dissipation mechanism of dihydrate gypsum under confining pressures. , 2020, 39(9): 1883-1892.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0031 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I9/1883

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