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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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

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0517 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3541

[1]	冯国瑞，白锦文，史旭东，等. 遗留煤柱群链式失稳的关键柱理论及其应用展望[J]. 煤炭学报，2021，46(1)：164-179.(FENG Guorui，BAI Jinwen，SHI Xudong，et al. Key pillar theory in the chain failure of residual coal pillars and its application prospect[J]. Journal of China Coal Society，2021，46(1)：164-179.(in Chinese))
[2]	王方田，屠世浩，李召鑫，等. 浅埋煤层房式开采遗留煤柱突变失稳机理研究[J]. 采矿与安全工程学报，2012，29(6)：770-775.(WANG Fangtian，TU Shihao，LI Zhaoxin，et al. Mutation Instability mechanism of the room mining residual pillars in the shallow depth seam[J]. Journal of Mining and Safety Engineering，2012，29(6)：770-775.(in Chinese))
[3]	白锦文. 复合残采区遗留群柱失稳致灾机理与防控研究[博士学位论文][D]. 太原：太原理工大学，2019.(BAI Jinwen. Research on the instability mechanism and prevention of residual coal pillars in the composite remining areas[Ph. D. Thesis][D]. Taiyuan：Taiyuan University of Technology，2019.(in Chinese))
[4]	白锦文，崔博强，戚庭野，等. 关键柱柱旁充填岩层控制基础理论[J]. 煤炭学报，2021，46(2)：424-438.(BAI Jinwen，CUI Boqiang，QI Tingye，et al. Fundamental theory for rock strata control of key pillar-side backfilling[J]. Journal of China Coal Society，2021，46(2)：424-438.(in Chinese))
[5]	ZHU W B，XU J M，XU J L，et al. Pier-column backfill mining technology for controlling surface subsidence[J]. International Journal of Rock Mechanics and Mining Sciences，2017，96：58-65.
[6]	TESARIK D R，SEYMOUR J B，YANSKE T R. Long-term stability of a backfilled room-and-pillar test section at the Buick Mine， Missouri，USA[J]. International Journal of Rock Mechanics and Mining Sciences，2009，46(7)：1 182-1 196.
[7]	戴华阳，郭俊廷，阎跃观，等. “采-充-留”协调开采技术原理与应用[J]. 煤炭学报，2014，39(8)：1 602-1 610.(DAI Huayang，GUO Junting，YAN Yueguan，et al. Principle and application of subsidence control technology of mining coordinately mixed with backfilling and keeping[J]. Journal of China Coal Society，2014，39(8)：1 602-1 610.(in Chinese))
[8]	安百富，余伟健，吴根水，等. 固体充填回收房式煤柱塑性区及应力演化特征[J]. 采矿与安全工程学报，2019，36(3)：609-616.(AN Baifu，YU Weijian，WU Genshui，et al. Plastic zone and stress evolution of pillars in working face with solid backfilling mining to recover room coal pillars[J]. Journal of Mining and Safety Engineering，2019，36(3)：609-616.(in Chinese))
[9]	陈绍杰，张俊文，尹大伟，等. 充填墙提升煤柱性能机理与数值模拟研究[J]. 采矿与安全工程学报，2017，34(2)：268-275.(CHEN Shaojie，ZHANG Junwen，YIN Dawei，et al. Mechanism and numerical simulation of filling walls improving performance of coal pillar[J]. Journal of Mining and Safety Engineering，2017，34(2)： 268-275.(in Chinese))
[10]	王方田，李岗，班建光，等. 深部开采充填体与煤柱协同承载效应研究[J]. 采矿与安全工程学报，2020，37(2)：311-318.(WANG Fangtian，LI Gang，BAN Jianguang，et al. Synergistic bearing effect of backfilling body and coal pillar in deep mining[J]. Journal of Mining and Safety Engineering，2020，37(2)：311-318.(in Chinese))
[11]	吴绵拔. 加载速率对岩石抗压和抗拉强度的影响[J]. 岩土工程学报，1982，4(2)：97-106.(WU Mianba. The effect of loading rate on the compressive and tensile strength of rocks[J]. Chinese Journal of Geotechnical Engineering，1982，4(2)：97-106.(in Chinese))
[12]	李夕兵，罗琳，黎崇金. 考虑岩石交界面方向效应的巴西劈裂试验研究[J]. 工程科学学报，2017，39(9)：1 295-1 304.(LI Xibing，LUO Lin，LI Chongjin. Experimental study of directivity effect of rock interface under Brazilian splitting[J]. Chinese Journal of Engineering，2017，39(9)：1 295-1 304.(in Chinese))
[13]	SHEN Y J，WANG Y Z，YANG Y，et al. Influence of surface roughness and hydrophilicity on bonding strength of concrete-rock interface[J]. Construction and Building Materials，2019，213： 156-166.
[14]	CHANG X，LU J，WANG S Y，et al. Mechanical performances of rock-concrete bi-material disks under diametrical compression[J]. International Journal of Rock Mechanics and Mining Sciences，2018，104：71-77.
[15]	李术才，郑卓，刘人太，等. 考虑浆-岩耦合效应的微裂隙注浆扩散机制分析[J]. 岩石力学与工程学报，2017，36(4)：812-820.(LI Shucai，ZHENG Zhuo，LIU Rentai，et al. Analysis on fracture grouting mechanism considering grout-rock coupling effect[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(4)：812-820.(in Chinese))
[16]	郑卓，李术才，刘人太，等. 注浆加固后岩体单一界面抗剪强度[J]. 岩石力学与工程学报，2016，35(增2)：3 915-3 922.(ZHENG Zhuo，LI Shucai，LIU Rentai，et al. Shearing strength of single structural surface of grouted rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(Supp.2)：3 915-3 922.(in Chinese))
[17]	刘泉声，雷广峰，卢超波，等. 注浆加固对岩体裂隙力学性质影响的试验研究[J]. 岩石力学与工程学报，2017，36(增1)：3 140-3 147. (LIU Quansheng，LEI Guangfeng，LU Chaobo，et al. Experimental study of grouting reinforcement influence on mechanical properties of rock fracture[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.1)：3 140-3 147.(in Chinese))
[18]	卢海峰，朱晨东，刘泉声. 不同注浆材料作用下结构面剪切力学特性研究[J]. 岩石力学与工程学报，2021，40(9)：1 803-1 811.(LU Haifeng，ZHU Chendong，LIU Quansheng. Study on shear mechanical properties of structural planes grouted with different materials[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(9)：1 803-1 811.(in Chinese))
[19]	卢海峰，曹爱德，刘泉声，等. 含内缺陷注浆固结体力学特性试验研究[J]. 岩石力学与工程学报，2020，39(8)：1 560-1 571.(LU Haifeng，CAO Aide，LIU Quansheng，et al. Experimental study on mechanical properties of grouting consolidating bodies with inner defects[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(8)：1 560-1 571.(in Chinese))
[20]	韩立军，宗义江，韩贵雷，等. 岩石结构面注浆加固抗剪特性试验研究[J]. 岩土力学，2011，32(9)：2 570-2 576.(HAN Lijun，ZONG Yijiang，HAN Guilei，et al. Study of shear properties of rock structural plane by grouting reinforcement[J]. Rock and Soil Mechanics，2011，32(9)：2 570-2 576.(in Chinese))
[21]	赵军，方越，闫思泉，等. 不同水灰比注浆锯齿结构面剪切力学特性试验研究[J]. 岩石力学与工程学报，2021，40(增1)：2 673-2 680.(ZHAO Jun，FANG Yue，YAN Siquan，et al. Study on shear mechanical properties of sawtooth structure with different water cement ratios grouting[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(Supp.1)：2 673-2 680.(in Chinese))
[22]	陆银龙，贺梦奇，李文帅，等. 岩石结构面注浆加固微观力学机制与浆-岩黏结界面结构优化[J]. 岩石力学与工程学报，2020，39(9)：1 808-1 818.(LU Yinlong，HE Mengqi，LI Wenshuai，et al. Micromechanical mechanisms of grouting reinforcement in rock joints and micro structure optimization of grout-rock bonding interfaces[J]. Chinese Journal of Rock Mechanics and Engineering，2020，39(9)：1 808-1 818.(in Chinese))
[23]	刘泉声，雷广峰，彭星新，等. 白砂岩、大理岩及花岗岩加锚剪切力学特性研究[J]. 岩石力学与工程学报，2018，37(增2)：4 007-4 015.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Study on shear mechanical properties of sandstone，marble and granite after anchoring[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(Supp.2)：4 007-4 015.(in Chinese))
[24]	刘泉声，雷广峰，彭星新，等. 节理岩体中锚杆剪切力学模型研究及试验验证[J]. 岩土工程学报，2018，40(5)：794-801.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Shearing mechanical model and experimental verification of bolts in jointed rock mass[J]. Chinese Journal of Geotechnical Engineering，2018，40(5)：794-801.(in Chinese))
[25]	陶志刚，任树林，何满潮，等. 地下工程微观NPR锚杆钢静力拉伸及锚固抗剪力学特性[J]. 煤炭学报，2022，47(2)：683-694.(TAO Zhigang，REN Shulin，HE Manchao，et al. Static tensile and bolting shear mechanical properties of micro-NPR bolt steel in underground engineering[J]. Journal of China Coal Society，2022，47(2)：683-694.(in Chinese))
[26]	WANG G，ZHANG Y Z，JIANG Y J，et al. Shear behaviour and acoustic emission characteristics of bolted rock joints with different roughnesses[J]. Rock Mechanics and Rock Engineering，2018，51(6)：1 885-1 906.
[27]	张书博，王长盛，王刚，等. BFRP筋锚固节理岩体剪切行为试验研究[J]. 岩石力学与工程学报，2022，41(4)：712-724.(ZHANG Shubo，WANG Changsheng，WANG Gang，et al. Experimental study on the shear behaviors of bolted rock joints reinforced with BFRP bars[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(4)：712-724.(in Chinese))
[28]	赵同彬，邹建超，傅知勇，等. 双节理贯通岩石锚固机理试验研究[J]. 煤炭学报，2020，45(9)：3 065-3 072.(ZHAO Tongbin，ZOU Jianchao，FU Zhiyong，et al. Experimental study on anchoring mechanism of double persistent jointed rock[J]. Journal of China Coal Society，2020，45(9)：3 065-3 072.(in Chinese))
[29]	董志强，吴刚. FRP筋增强混凝土结构耐久性能研究进展[J]. 土木工程学报，2019，52(10)：1-19.(DONG Zhiqiang，WU Gang. Research progress on durability of FRP bars reinforced concrete structures[J]. China Civil Engineering Journal，2019，52(10)：1-19.(in Chinese))
[30]	陆新征. FRP-混凝土界面行为研究[博士学位论文][D]. 北京：清华大学，2005.(LU Xinzheng. Studies on FRP-concrete interface[Ph. D. Thesis][D]. Beijing：Tsinghua University，2005.(in Chinese))
[31]	陆新征，叶列平，滕锦光，等. FRP-混凝土界面粘结滑移本构模型[J]. 建筑结构学报，2005，26(4)：10-18.(LU Xinzheng，YE Lieping，TENG Jinguang，et al. Bond-slip model for FRP-to-concrete interface[J]. Journal of Building Structures，2005，26(4)：10-18.(in Chinese))
[32]	王洋，冯君，李珈瑶，等. FRP锚杆在岩土锚固中的研究进展[J]. 工程地质学报，2018，26(3)：776-784.(WANG Yang，FENG Jun，LI Jiayao，et al. Advance of FRP anchor bolts in geotechnical an choring[J]. Journal of Engineering Geology，2018，26(3)：776-784.(in Chinese))
[33]	尹世平，华云涛，徐世烺. FRP配筋混凝土结构研究进展及其应用[J]. 建筑结构学报，2021，42(1)：134-150.(YIN Shiping，HUA Yuntao，XU Shilang. A review on research progress and application of concrete structures internally reinforced with FRP bars[J]. Journal of Building Structures，2021，42(1)：134-150.(in Chinese))
[34]	董志强，吴刚. FRP筋增强混凝土结构耐久性能研究进展[J]. 土木工程学报，2019，52(10)：1-19.(DONG Zhiqiang，WU Gang. Research progress on durability of FRP bars reinforced concrete structures[J]. China Civil Engineering Journal，2019，52(10)：1-19.(in Chinese))
[35]	JYOTI D A，KUMAR M P，NATH G C，et al. Extraction of locked-up coal by strengthening of rib pillars with FRP-A comparative study through numerical modelling[J]. International Journal of Mining Science and Technology，2017，27(2)：261-267.
[36]	杨晨. FRP-煤矸石混凝土—薄壁钢双壁实心柱偏压力学性能研究[硕士学位论文][D]. 徐州：中国矿业大学，2021.(YANG Chen. Study on mechanical behavior of double-tube coal gangue concrete columns with an FRP external tube and a thin-walled steel internal tube subjected to eccentric load[M. S. Thesis][D]. Xuzhou：China University of Mining，2021.(in Chinese))
[37]	ZHAO H C，REN T，REMENNIKOV A. Behaviour of FRP-confined coal reject concrete columns under axial compression[J]. Composite Structures，2021，262：113621.
[38]	ZHAO H C，REN T，REMENNIKOV A. Behaviour of FRP-confined coal rejects based backfill material under compression[J]. Construction and Building Materials，2020，268(5)：121171.
[39]	李庆文，胡露露，曹行，等. CFRP布均匀约束煤圆柱轴压性能[J]. 复合材料学报，2019，39(11)：5 611-5 642.(LIQingwen，HU Lulu，CAO Hang，et al. Axial compressive behavior of CFRP uniformly wrapped coal in circular columns[J]. Acta Materiae Compositae Sinica，2019，39(11)：5 611-5 642.(in Chinese))
[40]	ISRM. Suggested methods for determining tensile strength of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1978，15(3)：99-103.
[41]	ZHOU Z L，LU J Y，CAI X，et al. Static and dynamic tensile behavior of rock-concrete bi-material disc with different interface inclinations[J]. Construction and Building Materials，2020，256：119424.
[42]	SHI X D，BAI J W，FENG G R，et al. Crack propagation law at the interface of FRP wrapped coal-backflling composite structure[J]. Construction and Building Materials，2022，344：128229.
[43]	SELCUK L. Experimental investigation of the Rock-Concrete bi materials influence of inclined interface on strength and failure behavior[J]. International Journal of Rock Mechanics and Mining Sciences，2019，123：1-11.
[44]	LIU L W，LI H B，LI X F，et al. Underlying mechanisms of crack initiation for granitic rocks containing a single pre-existing flaw：insights from digital image correlation(DIC) analysis[J]. Rock Mechanics and Rock Engineering，2021，54(2)：857-873.
[45]	杨仁树，李炜煜，方士正，等. 层状复合岩体冲击动力学特性试验研究[J]. 岩石力学与工程学报，2019，38(9)：1 747-1 757.(YANG Renshu，LI Weiyu，FANG Shizheng，et al. Experimental study on impact dynamic characteristics of layered composite rocks[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(9)：1 747- 1 757.(in Chinese))
[46]	齐飞飞，张科，谢建斌. 基于DIC技术的含不同节理密度类岩石试件破裂机制研究[J]. 岩土力学，2021，42(6)：1 669-1 680.(QI Feifei，ZHANG Ke，XIE Jianbin. Fracturing mechanism of rock-like specimens with different joint densities based on DIC technology[J]. Rock and Soil Mechanic，2021，42(6)：1 669-1 680.(in Chinese))
[47]	苗金丽，何满潮，李德建，等. 花岗岩应变岩爆声发射特征及微观断裂机制[J]. 岩石力学与工程学报，2009，28(8)：1 593-1 603. (MIAO Jinli，HE Manchao，LI Dejian，et al. Acoustic emission characteristics of granite under strain rockburst test and its micro-fracture mechanism[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(8)：1 593-1 603.(in Chinese))
[48]	张明，李仲奎，杨强，等. 准脆性材料声发射的损伤模型及统计分析[J]. 岩石力学与工程学报，2006，25(12)：2 493-2 501. (ZHANG Ming，LI Zhongkui，YANG Qiang，et al. A damage model and statistical analysis of acoustic emission for quasi-brittle materials[J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(12)：2 493-2 501.(in Chinese))
[49]	KACHANOV L M. Time of rupture process under creep conditions[J]. Izvestia Akademii Nauk SSSR，Otdelenie Tekhnicheskich Nauk，1958，23(8)：26-31.
[50]	王伟，赵毅鑫，高艺瑞，等. 层理和预制裂纹方向对煤断裂力学性质影响规律试验研究[J]. 岩石力学与工程学报，2022，41(3)：433-445.(WANG Wei，ZHAO Yixin，GAO Yirui，et al. Experimental research of influences of bedding and pre-crack directions on fracture characteristics of coal[J]. Chinese Journal of Rock Mechanics and Engineering，2022，41(3)：433-445.(in Chinese))
[51]	刘斌，赵毅鑫，张汉，等. 单轴压缩及劈裂试验下煤的声发射特征研究[J]. 采矿与安全工程学报，2020，37(3)：613-621.(LIU Bin，ZHAO Yixin，ZHANG Han，et al. Acoustic emission characteristics of coal under uniaxial compression and Brazilian splitting[J]. Journal of Mining and Safety Engineering，2020，37(3)：613-621.(in Chinese))
[52]	甘一雄，吴顺川，任义，等. 基于声发射上升时间/振幅与平均频率值的花岗岩劈裂破坏评价指标研究[J]. 岩土力学，2020，41(7)：2 324-2 332.(GAN Yixiong，WU Shunchuan，REN Yi，et al. Evaluation indexes of granite splitting failure based on RA and AF of AE parameters[J]. Rock and Soil Mechanic，2020，41(7)：2 324- 2 332.(in Chinese))
[53]	AGGELIS D G. Classification of cracking mode in concrete by acoustic emission parameters[J]. Mechanics Research Communications，2011，38(3)：153-157.