干–酸侵蚀下深地白砂岩动静态损伤特性研究

doi:10.13722/j.cnki.jrme.2022.1218

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摘要保证地下开采作业的安全性，事关工程人员生命财产重大问题。以岩体损伤为研究立足点，提出“三试一模”多方位岩体损伤机制研究方法：从干–酸侵蚀、一维冲击、单轴压缩三个试验角度探讨白砂岩损伤过程中岩体的能量、物理力学参数等演化劣化规律，并构建岩体损伤统计本构模型，以进行损伤劣化验证。结果表明：(1) 干–酸侵蚀环境中，岩体损伤率由初期反应平缓到初中期、中后期反应加剧，后期反应逐渐殆尽，损伤反应基本与氢离子浓度指数成正比。(2) 冲击后，岩体的峰值应力、弹性模量随着干–酸侵蚀次数的增加呈降低趋势，整体上损伤表现为软化现象；侵蚀后期2项力学指标整体上的变化速率呈上升趋势，岩体损伤劣化加剧。(3) 单轴压缩下，岩体随着轴向荷载的加重，弹性势能随之增大，其能量增长速率不明显，在轴向荷载80 kN左右处，弹性势能占总能量的比例最小；岩体塑性耗散能呈非线性增长趋势：在早期的3个阶段，塑性耗散能占总能量的比例变小，到后期塑性阶段即临近损伤破坏时，塑性耗散能占比呈增长趋势。(4) 假定白砂岩的岩体强度遵循Weibull分布，构建可较好地反映白砂岩残余强度的岩体损伤统计本构模型，并借助单轴压缩试验结果对该模型的准确性进行有效验证。本研究方法较为系统，研究内容非常丰富，成果极大地提高了岩石深部开采安全性，为地下岩体开采作业的损伤研究提供了新的思路。

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	倪苏黔1
	徐颖1
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	葛进进1
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	王凤瑶3
	谢昊天1
	丁进甫1

关键词 ：岩石力学, 白砂岩, 深地, 损伤机制, 干&ndash, 酸侵蚀, 动静态

Abstract：In order to ensure the safety of underground mining operations，the“three tests and one model”multi-directional rock damage mechanism research method was proposed. The results show that：(1) In the dry-acid erosion environment，the damage rate of the rock mass changes from a slow response at the early stage to an increased response in the middle and late stages. The damage response is gradually exhausted at the late stage and basically proportional to the hydrogen ion concentration index. (2) After the impact，the peak stress and elastic modulus of the rock mass decrease with the increase of the number of dry-acid erosion，and the overall damage shows the softening phenomenon. The damage deterioration of the rock mass increases in the late erosion period. (3) Under uniaxial compression，the elastic potential energy of the rock increases with the increase of axial load，and its energy growth rate is not obvious. The ratio of elastic potential energy to the total energy is the smallest at the axial load of about 80 kN. In the early three stages，the ratio of plastic dissipation energy to the total energy becomes smaller. The percentage of plastic dissipation energy tends to increase in the later plastic phase，i.e.，near damage failure. (4) Assuming that the rock strength of white sandstone follows the Weibull distribution，a statistical damage constitutive model of rock that can better reflect the residual strength of white sandstone is constructed. The accuracy of the model is effectively verified by the results of uniaxial compression tests. This research results greatly improve the safety of deep rock mining and provide a new idea for damage research of underground rock mining operations.

Key words： rock mechanics white sandstone deep-earth damage mechanism dry-acid erosion dynamic-static

引用本文:

倪苏黔1，徐颖1，2，葛进进1，2，王凤瑶3，谢昊天1，丁进甫1. 干–酸侵蚀下深地白砂岩动静态损伤特性研究[J]. 岩石力学与工程学报, 2023, 42(10): 2528-2539.
NI Suqian1，XU Ying1，2，GE Jinjin1，2，WANG Fengyao3，XIE Haotian1，DING Jinfu1. Dynamic and static damage characteristics of deep-earth white sandstone#br# under dry-acid erosion. , 2023, 42(10): 2528-2539.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.1218 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I10/2528

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