煤柱–坝体协同承载体细观裂纹扩展及损伤特征分析

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摘要地下空间封存地质协同承载体自身的安全性，对储能/储碳工程发展至关重要。以煤柱–坝体构建的封存地质协同承载体室内单轴压缩试验为基础，利用离散元颗粒流PFC中的UDTensor绘制应力十字架、UDScalar绘制裂纹热点场及Ball displacement_mag绘制位移场，进而对其受载过程中应力场–裂纹分布–位移场的演化和细观损伤特征进行分析研究。研究结果表明：协同承载体试样整体以斜向剪切破坏为主，破裂面呈倒“V”型，随着岩占比的增大，剪胀特征明显有所减弱；试样裂纹数量整体上呈现出“萌生–缓慢–加速”的变化特征，进入破坏阶段后煤单体、岩单体的剪切、拉伸几乎同时发挥作用，而协同承载体剪切作用强于拉伸；应力的集中和转移(应力十字架长度变化、方向偏转)，形成细观损伤(裂纹萌生、成核)并累积，进而主导宏观破裂(裂纹扩展、贯通)形态，直观地揭示了试样细观损伤累积至宏观破裂的过程。最后，基于裂纹数量(萌生)、裂纹长度(扩展)变化识别岩石试样特征强度是一种较可靠的方法。其中，剪切裂纹数量的变化能更早识别起裂强度，拉伸裂纹长度扩展速率法能更早的识别损伤强度。研究结果为深入认识地下空间封存地质协同承载体细观损伤和安全稳定性监测提供了理论基础。

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	唐一举1
	2
	贾炳1
	郝天轩2
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	娄全1
	刘静1
	卢方超1
	刘升1
	万祥云1
	李超涵1

关键词 ：采矿工程, 地下空间封存, 煤柱–坝体协同承载体, 裂纹扩展, 损伤特征

Abstract：The safety of the underground space storage geologic synergistic carrier is crucial for developing energy/carbon storage engineering. Based on the indoor uniaxial compression test of the sequestered geologic synergistic carrier constructed by coal pillar-dam，the UDTensor，the UDScalar and the Ball displacement_mag in discrete element particle flow PFC are respectively used to map the stress cross，the crack hot spot field and the displacement field，to analyze and study the evolution of the stress field-crack distribution-displacement field and the microscopic damage characteristics of the carrier during the loading process. The results show that the synergistic carrier specimen is mainly damaged by oblique shear，the rupture surface is inverted “V” type，and the shear expansion characteristics are weakened with the increase of the proportion of rock. The number of cracks in the specimen overall shows the change of“emergence-slowly-accelerating”characteristics，and after entering the damage stage，the coal monomer is damaged by the cracks. After entering the destruction stage，the shear and tension of coal monomer and rock monomer almost play a role at the same time，and the shear effect of the synergistic carrier is stronger than the tension；the concentration and transfer of stress(change in the length and direction of the stress cross)，the formation of microscopic damage(crack budding，nucleation) and accumulation，and then dominate the macro rupture(crack expansion，penetration)，which intuitively reveals the process of the accumulation of microscopic damage to macro rupture. The process of the accumulation of microscopic damage to macroscopic rupture is revealed intuitively. Finally，it is a reliable method to recognize the characteristic strength of rock samples based on the changes in crack number(emergence) and crack length(extension). Among them，the change of shear crack number can recognize the initiation strength of the specimen earlier，and the extension rate of tensile crack length can realize the damage strength earlier. The results of the study provide a theoretical basis for a deeper understanding of the microscopic damage and safety and stability monitoring of geologically synergistic bearers sealed in underground space.

Key words： mining engineering underground space sealing coal pillar-dam synergistic carrier crack propagation damage characteristics

引用本文:

唐一举1，2，贾炳1，郝天轩2，3，娄全1，刘静1，卢方超1，刘升1，万祥云1，李超涵1. 煤柱–坝体协同承载体细观裂纹扩展及损伤特征分析[J]. 岩石力学与工程学报, 2024, 43(12): 3081-3095.
TANG Yiju1，2，JIA Bing1，HAO Tianxuan2，3，LOU Quan1，LIU Jing1，LU Fangchao1，LIU Sheng1，WAN Xiangyun1，LI Chaohan1. Characterization of fine-scale crack extension and damage in coal pillar-dam synergistic carrier. , 2024, 43(12): 3081-3095.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I12/3081

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