单双向约束下加载系统刚度对砂岩峰后破坏行为的影响规律研究

doi:10.13722/j.cnki.jrme.2023.1204

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摘要为研究深部复杂刚度环境差异性对岩体力学行为的影响，利用自主研发的二维可变刚度动力破坏模拟试验系统，结合声发射(AE)监测设备，开展砂岩在不同刚度环境下单双轴压缩试验研究，旨在讨论不同约束条件下加载系统刚度对砂岩的力学响应特性、峰后回弹变形特征及能量演化的影响。结果表明：(1) 砂岩试件应力–应变曲线在峰后阶段受刚度环境的影响显著，在单轴条件下，随着加载系统刚度的减小，呈现出更快的应力下降和更多的宏观裂纹产生，在侧向约束下，加载系统刚度对岩样多次回弹冲击，影响峰后曲线起伏和声发射(AE)事件的波动，呈现出能量的阶梯式增长。(2) 单双向加载下加载系统刚度与试验机框架储存应变能、峰后回弹极值速度和累计最大耗散能均呈负相关性，较低的加载刚度导致更大的能量释放速度，增加岩样宏观裂纹和损伤程度。(3) 在加载系统刚度的控制下，试验机框架储存应变能、峰后瞬时回弹速度和累计耗散能均与侧向约束力呈正相关，侧向约束条件增强了刚度效应，对岩样变形特征产生显著影响。(4) 低刚度环境会对岩体产生动力冲击和能量补给，产生动力破坏，施加约束力，可提高岩体的储能极限，弱化刚度环境中岩体的破坏程度。

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	吴旭坤1
	2
	赵光明1
	2
	孟祥瑞1
	2
	许文松1
	2
	刘崇岩1
	2
	刘之喜1
	2
	张启航1
	2
	高宇1
	2

关键词 ：岩石力学, 单双向加载, 峰后回弹变形, 加载系统刚度, 耗散能, 应变能

Abstract：In order to study the influence of deep complex stiffness environment difference on rock mass mechanical behavior，the two-dimensional variable stiffness dynamic failure simulation test system，combined with acoustic emission(AE) monitoring equipment，was used to carry out experimental research on unilateral and biaxial compression of sandstone in different stiffness environments，aiming to discuss the effects of loading system stiffness on the mechanical response characteristics，post-peak rebound deformation characteristics and energy evolution of sandstone under unilateral and biaxial constraints. The results show that：(1) The stress-strain curve of sandstone specimens is significantly affected by the stiffness environment in the post-peak stage. Under the uniaxial conditions，with the decrease of the stiffness of the loading system，the stress drop is faster and more macroscopic cracks are generated. Under the lateral constraints，the stiffness of the loading system has multiple rebound impacts on the rock samples，affecting the fluctuation of the post-peak curve and the fluctuation of acoustic emission(AE) events. It shows a step increase in energy. (2) The stiffness of the loading system is negatively correlated with the stored strain energy of the testing machine frame，the extreme post-peak rebound velocity and the cumulative maximum dissipated energy under unidirectional and bidirectional loading. Lower loading stiffness leads to greater energy release velocity and increases the macroscopic crack and damage degree of the rock sample. (3) Under the control of the stiffness of the loading system，the stored strain energy，post-peak instantaneous rebound velocity and cumulative dissipated energy of the testing machine frame are positively correlated with the lateral binding force，and the lateral constraint conditions enhance the stiffness effect and have a significant impact on the deformation characteristics of rock samples. (4) The low-stiffness environment will produce dynamic impact and energy supply to the rock mass，resulting in dynamic damage and binding force，which can improve the energy storage limit of the rock mass and weaken the damage degree of the rock mass in the rigidity environment.

Key words： rock mechanics unilateral and biaxial loading post-peak rebound deformation loading system stiffness dissipated energy strain energy

引用本文:

吴旭坤1，2，赵光明1，2，孟祥瑞1，2，许文松1，2，刘崇岩1，2，刘之喜1，2，张启航1，2，高宇1，2. 单双向约束下加载系统刚度对砂岩峰后破坏行为的影响规律研究[J]. 岩石力学与工程学报, 2024, 43(11): 2796-2810.
WU Xukun1，2，ZHAO Guangming1，2，MENG Xiangrui1，2，XU Wensong1，2，LIU Chongyan1，2，LIU Zhixi1，2，ZHANG Qihang1，2，GAO Yu1，2. Study on the influence of loading system stiffness on post-peak failure of sandstone under unilateral and biaxial constraints. , 2024, 43(11): 2796-2810.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1204 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I11/2796

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