动态渗压环境下卸荷岩石循环加卸载变形破坏及能量演化过程分析

doi:10.13722/j.cnki.jrme.2023.1218

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摘要以渗压环境下工程可利用性开挖卸荷岩体为研究对象，开展循环孔隙水压力作用下卸荷岩样的三轴循环加载破坏试验，探究动态循环载荷作用下孔压量级及卸荷量级对岩样强度变形与能量演化特征的影响规律。结果表明：(1) 卸荷岩样的循环加卸载应力–应变曲线形态受孔压及卸荷量级的影响较大；(2) 循环加卸载过程中，卸荷岩样峰值环向应变和体积应变因卸荷量级产生的差异性，随着初始孔压水平的增加，呈现出先增加后减小的变化趋势；(3) 卸荷岩样的特征能量随循环周次增加呈非线性增长趋势，循环孔压环境下卸荷岩样产生的总输入能总体上大于恒定孔压作用下产生的总输入能。

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	陈兴周
	白亚妮
	陈莉丽
	龚盛
	王文瑞
	李针汗
	苏振坤

关键词 ：岩石力学, 循环孔压, 开挖卸荷, 力学特性, 能量分配

Abstract：Taking the excavation and unloading of rock mass under seepage pressure environment as the research object，triaxial cyclic loading failure tests were conducted on unloading rock samples under cyclic pore water pressure to explore the influence of pore pressure level and unloading level on the deformation and energy evolution characteristics of rock samples under dynamic cyclic loading. The results show that：(1) The shape of the stress-strain curve of unloaded rock samples under cyclic loading and unloading is greatly influenced by the pore pressure and the unloading magnitude；(2) During the cyclic loading and unloading process，the difference between the peak circumferential strain and the volumetric strain of unloaded rock samples due to the unloading magnitude shows a trend of first increasing and then decreasing with increasing the initial pore pressure level；(3) The characteristic energy of unloaded rock samples shows a non-linear growth trend with increasing the number of cycles，and the total input energy of unloaded rock samples under the cyclic pore pressure environment is generally than that under the constant pore pressure.

Key words： rock mechanics cyclic pore pressure excavation unloading mechanical properties energy allocation

引用本文:

陈兴周，白亚妮，陈莉丽，龚盛，王文瑞，李针汗，苏振坤. 动态渗压环境下卸荷岩石循环加卸载变形破坏及能量演化过程分析[J]. 岩石力学与工程学报, 2024, 43(10): 2356-2367.
CHEN Xingzhou，BAI Yani，CHEN Lili，GONG Sheng，WANG Wenrui，LI Zhenhan，SU Zhenkun. Analysis of cyclic loading and unloading deformation and energy evolution process of unloaded rocks under dynamic osmotic pressure environment. , 2024, 43(10): 2356-2367.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.1218 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I10/2356

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