FRP包裹对煤充结构体劈裂破坏特征的影响

doi:10.13722/j.cnki.jrme.2022.0517

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摘要柱旁充填中煤柱与充填体共同组成具有协同承载作用的煤充结构体，二者之间的界面为煤充结构体薄弱环节。界面失稳会诱发煤充结构体的整体失稳，FRP包裹可以用于增强界面稳定性。本文开展不同界面角度情形下煤充结构体的3组巴西劈裂试验(不进行FRP包裹、FRP包裹1圈和FRP包裹2圈)，结合DIC和声发射监测技术，研究FRP包裹对煤充结构体劈裂破坏特征的影响。结果表明：(1) 煤充结构体界面上所受荷载超过界面抗拉强度或界面抗剪强度时会产生界面裂纹；煤体元件或充填体元件所受荷载超过其抗拉强度时会产生拉伸裂纹；FRP包裹后，煤充结构体能够承受的荷载增加，积聚的能量不能通过界面分离释放，使得煤体元件上出现集中破坏区。(2) 随着界面角度增大，界面裂纹由拉伸裂纹转变为剪切裂纹；FRP包裹后，界面裂纹的发育程度显著降低，且其脆性特征也会减弱。(3) 煤充结构体应变带的扩展方向包括沿着加载方向扩展和沿着界面方向扩展2种；FRP包裹会增大煤充结构体界面的抗拉强度和抗剪强度，使得界面稳定性增强。(4) FRP包裹可以提高煤充结构体试样的AE计数，并削减试样最终发生失稳时的损伤程度。(5) FRP包裹后煤充结构体的AF–RA数据点数量增多，FRP包裹使得试样在失稳前能经历更多的裂纹产生与扩展。该研究成果有望为柱旁充填中煤充结构体的劈裂失稳防控提供理论指导。

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关键词 ：采矿工程, 煤充结构体, FRP包裹, 劈裂破坏, 界面角度, DIC, 声发射

Abstract：The coal pillar-backfilling composite structure jointly bears the stress in the pillar-side backfilling. The interface between the coal pillar and backfilling is the weakest area. The instability of the interface can induce the failure of the composite structure, and fiber-reinforced polymer(FRP) could be applied to enhance interface stability. Three sets of Brazilian splitting laboratory tests were carried out on coal-backfilling composite structures(without FRP wrapping for reinforcement，FRP wrapping for 1 circle and FRP wrapping for 2 circles) with different interface angles. The DIC and acoustic emission monitoring techniques were used to study the characteristics of the specimens. The results show that：(1) When the load on the interface exceeded the interface tensile or shear strength，interface cracks occurred；the load exceeded the tensile strength of the coal or backfilling element，resulting in tensile cracks；after FRP wrapping，the energy accumulated by the increased load on the specimen cannot be released through the interface separation，resulting in a concentrated damage zone on the coal element. (2) As the interface angle in-creased，the interface crack changed from tensile failure to shear failure. After FRP wrapping，the development of interfacial cracks was significantly reduced，and the brittle characteristics of the specimens were reduced. (3) The strain zone of the specimens expanded along the loading or interface direction. FRP wrapping increased the tensile and shear strength of the interface. The stability of the interface increased. (4) FRP wrapping increased the AE counts and reduced the damage degree of the specimens when the specimens were damaged. (5) The number of AF-RA data points for the specimens increased after FRP wrapping. It indicates that the specimens were able to experience more crack generation and expansion before instability. This study is expected to provide theoretical guidance for the prevention of splitting instability in pillar-side backfilling.

Key words： mining engineering coal-backfilling structure FRP restricting splitting failure interface angle DIC acoustic emission

引用本文:

白锦文1，2，3，杨欣宇1，2，史旭东1，2，冯国瑞1，2，崔博强1，2，宋诚1，2，王凯1，2，李剑1，2. FRP包裹对煤充结构体劈裂破坏特征的影响[J]. 岩石力学与工程学报, 2023, 42(S1): 3541-3557.
BAI Jinwen1，2，3，YANG Xinyu1，2，SHI Xudong1，2，FENG Guorui1，2，CUI Boqiang1，2，. Influence of FRP restricting on the splitting failure characteristics of coal-backfilling composite structures. , 2023, 42(S1): 3541-3557.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0517 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS1/3541

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