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| Experimental study on the shear behaviors of bolted rock joints reinforced with BFRP bars#br# |
| ZHANG Shubo1，2，WANG Changsheng1，2，WANG Gang1，2，WU Xuezhen3，ZHENG Xin1，2，HE Peng1，2，XU Feng1，2 |
(1. College of Civil Engineering，Shandong University of Science and Technology，Qingdao，Shandong 266590，China；
2. Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation，Shandong University
of Science and Technology，Qingdao，Shandong 266590，China；3. College of Civil Engineering，Fuzhou
University，Fuzhou，Fujian 350108，China) |
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Abstract Basalt Fiber Reinforced Polymer(BFRP) is gradually used as bolts in underground engineering. In order to study the shear characteristics of jointed rocks reinforced with BFRP bars，laboratory shear tests were carried out to comparatively analyze the shear properties of bolted joint rocks with BFRP bars and steel bars，including shear strength-displacement curve，shear strength，bolt failure characteristics and internal force changes in the bolts，and the influence factors such as roughness，bolt inclination and normal strength were also considered. The results show that，compared with the steel bolts，the BFRP bolted specimens have a lower shear stiffness，a larger peak shear displacement and a higher residual shear strength. The BFRP bolted specimens absorb more energy before the shear peak than the steel bar bolted specimens，although both them absorb the same total energy and exhibit toughness in the shear process. The shear strength of the BFRP bar bolted joint rocks is greatly affected by the inclination angle with a lower shear strength when the inclination angle is equal to 90°. When the inclination angle is reduced to less than 60°，the BFRP bolted specimens have a higher shear strength than the steel bar bolted specimens. The shear failure characteristics of BFRP bolted joint rocks can be categorized as：resin matrix fracture，shearing of both resin matrix and fibers，and fracturing of resin matrix and surrounding rock. When the BFRP bars fail，there is no obvious plastic yield. The resin matrix frequently breaks under a small shear displacement，while the fiber is able to resist a large joint dislocation which improves the contribution of the normal stress to the shear strength. Based on the strain monitoring data，the contribution rates of the axial force and shear force from the BFRP bars and the steel bars to the shear strength were quantitatively analyzed at an inclination angle of 60°. It was found that，compared with the steel bars，the axial force of the BFRP bolts increases faster under the same shear displacement and there was a greater contribution from the axial force to the shear strength.
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[1] 黄志怀，李国维，王思敬，等. 不同围岩条件玻璃纤维增强塑料锚杆结构破坏机制现场试验研究[J]. 岩石力学与工程学报，2008，27(5)：1 008–1 018.(HUANG Zhihuan，LI Guozhi，WANG Sijing，et al. Field test on pullout behaviors of anchorage structures with glass fiber reinforced plastic rods for different surrounding rock masses[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(5)：1 008–1 018.(in Chinese))
[2] 傅宏俊，马崇启，王 瑞. 玄武岩纤维表面处理及其复合材料界面改性研究[J]. 纤维复合材料，2007，(3)：11–13.(FU Hongjun，MA Chongqi，WANG Rui. Investigation on surface treatment of basalt-fiber and interfacial modification of composites[J]. Fiber Composites，2007，(3)：11–13.(in Chinese))
[3] WANG X，WANG Z，WU Z，et al. Shear behavior of basalt fiber reinforced polymer(FRP) and hybrid FRP rods as shear resistance members[J]. Construction and Building Materials，2014，73(30)：781–789.
[4] 曹晓峰，赵 文，谢 强，等. BFRP筋材基本力学性能试验研究[J]. 公路工程，2016，41(5)：215–217.(CAO Xiaofeng，ZHAO Wen，XIE Qiang，et al. Experimental study on mechanical properties of basalt fiber reinforced plastic rebar[J]. Highway Engineering，2016，41(5)：215–217.(in Chinese))
[5] 冯 君，王 洋，张俞峰，等. 玄武岩纤维与钢筋锚杆锚固性能现场对比试验研究[J]. 岩土力学，2019，40(11)：4 185–4 193.(FENG Jun，WANG Yang，ZHANG Yufeng，et al. Experimental comparison of anchorage performance between basalt fiber and steel bars[J]. Rock and Soil Mechanics，2019，40(11)：4 185–4 193.(in Chinese))
[6] 赖天文，雷 浩，武志信，等. 玄武岩纤维增强复合材料在高边坡防护中的振动台试验研究[J]. 岩土力学，2021，42(2)：390–400. (LAI Tianwen，LEI Hao，WU Zhixin，et al. Shaking table test study on basalt fiber reinforcedplastics in high slope protection[J]. Rock and Soil Mechanics，2021，42(2)：390–400.(in Chinese))
[7] 刘泉声，雷广峰，彭星新，等. 锚杆锚固对节理岩体剪切性能影响试验研究及机制分析[J]. 岩土力学，2017，38(增1)：27–35.(LIU Quansheng，LEI Guangfeng，PENG Xingxin，et al. Experimental study and mechanism analysis of influence of bolt anchoring on shear properties of jointed rock mass[J]. Rock and Soil Mechanics，2018，38(Supp.1)：27–35.(in Chinese))
[8] B. LUDVIG. Shear tests on rock bolts[C]// Proceedings of the International Symposium on Rock Bolting. Abisko：[s. n.]，1983：193–203.
[9] SPANG K，EGGER P. Action of fully-grouted bolts in jointed rock and factors of influence[J]. Rock Mechanics and Rock Engineering，1990，23：201–229.
[10] FERRERO A M. The shear strength of reinforced rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(6)：595–605.
[11] 张 波，李术才，杨学英，等. 含交叉裂隙节理岩体锚固效应及破坏模式[J].岩石力学与工程学报，2014，33(5)：996–1 003.(ZHANG Bo，LI Shucai，YANG Xueying，et al. Bolting effect and failure modes of jointed rock masses with cross-cracks[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(5)：996–1 003.(in Chinese))
[12] HE L，AN X M，ZHAO Z Y. Fully grouted rock bolts：an analytical investigation[J]. Rock Mechanics and Rock Engineering，2014，48：1 181–1 196.
[13] SIGNER S P，LEWIS J L. A case study of bolt performance in a two–entry gateroad[C]// Proceeding 17th International Conference on Ground Control in Mining. Morgantown：[s. n.]，1998：249–259.
[14] HAILE A T. Observations of the dynamic performance of South African tunnel support systems[C]// Proceedings Rock Support and Reinforcement Practice in Mining. Kalgoorlie，Australia：[s. n.]，1999：335–341.
[15] SIMSER B P. The weakest link–ground support observations at some Canadian Shield hard rock mines[C]// Deep Mining 07–Proceedings of the 4th International Seminar on Deep and High Stress Mining. [S. l.]：[s. n.]，2007：335–348.
[16] 李育宗，刘才华. 拉剪作用下节理岩体锚固力学分析模型[J]. 岩石力学与工程学报，2016，35(12)：2 471–2 478.(LI Yuzong，LIU Caihua. An analytical model of jointed rock bolts under the combinationof tensile and shear loads[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(12)：2 471–2 478.(in Chinese))
[17] 赖 冰. BFRP 土层锚杆界面力学行为研究[硕士学位论文][D]. 成都：西南交通大学，2019.(LAI Bing. Study on the interfacial mechanical behavior of BFRP soil anchor bolt[M. S. Thesis][D]. Chengdu：Southwest Jiaotong University，2019.(in Chinese))
[18] 赵 文，王 浩，陈 云，等. BFRP筋锚杆土质边坡支护应用研究[J]. 工程地质学报，2016，24(5)：1 008–1 015.(ZHAO Wen，WANG Hao，CHEN YUN，et al. Laboratory and field tests use of BFRP anchor bolt in supporting soil slope[J]. Journal of Engineering Geology，2016，24(5)：1 008–1 015.(in Chinese))
[19] 朱 虹，董志强，吴 刚，等. FRP筋混凝土梁的刚度试验研究和理论计算[J]. 土木工程学报，2015，48(11)：44–53.(ZHU Hong，DONG Zhiqiang，WU Gang，et al. Experimental study and theoretical calculation on the flexural stiffness of concrete beams reinforced with FRP bars[J]. China Civil Engineering Journal，2015，48(11)：44–53. (in Chinese))
[20] 朱海堂，程晟钊，高丹盈，等. 玄武岩纤维增强聚合物筋钢纤维高强混凝土梁受弯试验及裂缝宽度计算方法研究[J]. 建筑结构学报，2020，41(6)：133–142.(ZHU Haitang，CHENG Shengzhao，GAO Danying，et al. Bending experimental study and crack width calculation method of high-strength concrete beams reinforce with BFRP bars and steel fiber[J]. Journal of Building Structures，2020，41(6)：133–142.(in Chinese))
[21] CHEN Y，LI C C. Performance of fully encapsulated rebar bolts and D-Bolts under combined pull-and-shear loading[J]. Tunnelling and Underground Space Technology，2015，45：99–106.
[22] MILLER S M，WARD D C. Evaluation of pullout resistance and direct–shear strength of grouted fiberglass cable bolts[J]. International Journal of Rock Mechanics and Mining Sciences，1998，35(4)：400–400.
[23] 王海刚，白晓宇，张明义，等. 玄武岩纤维增强聚合物锚杆在岩土锚固中的研究进展[J]. 复合材料科学与工程，2020，(8)：113–122. (WANG Haigang，BAI Xiaoyu，ZHANG Mingyi，et al. Research progress of basalt fiber reinforced polymer bolt in geotechnical anchorage[J]. Chinese Journal of Composite Materials Science and Engineering，2020，(8)：113–122.(in Chinese))
[24] CUI G J，ZHANG C Q，CHEN J L，et al. Effect of bolt inclination angle on shear behavior of bolted joints under CNL and CNS conditions[J]. Journal of Central South University，2020，27(3)：937–950.
[25] BJURSTROM S. Shear strength of hard rock joints reinforced by grouted untensioned bolts[C]// 3rd ISRM Congress. Denver，USA：[s. n.]，1974：1 194–1 199.
[26] 中华人民共和国国家标准编写组. GB/T 228.1—2010金属材料拉伸试验，第一部分：室温实验方法[S]. 北京：中国标准出版社，2010.(The National Standards Compilation Group of People¢s Republic of China. GB/T 228.1—2010 Metallic materials—tensile testing—Part 1：Method of test at room temperature[S]. Beijing：Standards Press of China，2010.(in Chinese))
[27] 中华人民共和国行业标准编写组. JG/T 406—2013 土木工程用玻璃纤维增强筋[S]. 北京：中国标准出版社，2013.(The Professional Standards Compilation Group of People¢s Republic of China. JG/T 406—2013 Glass fiber reinforced polymer rebar for civil engineering[S]. Beijing：Standards Press of China，2013.(in Chinese))
[28] 肖同亮，邱洪兴. 孙兰香. 钢–玄武岩纤维复合筋拉压力学性能试验研究[J]. 东南大学学报：自然科学版，2014，44(4)：805– 810.(XIAO Tongliang，QIU Hongxing，SUN Lanxiang. Experimental and theory study on tensile and compression mechanical properties of steel-basalt fiber composite bars[J]. Journal of Southeast university：Natural Science，2014，44(4)：805–810.(in Chinese))
[29] 蒋宇静，张孙豪，栾恒杰，等. 恒定法向刚度边界条件下锚固节理岩体剪切特性试验研究[J]. 岩石力学与工程学报，2021，40(4)：663–675.(JIANG Yujing，ZHANG Shuhao，LUAN Hengjie，et al. Experimental study on shear characteristics of bolted rock joints under constant normal stiffness boundary conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(4)：663–675.(in Chinese))
[30] WU X，JIANG Y，GONG B，et al. Behaviour of rock joint reinforced by energy-absorbing rock bolt under cyclic shear loading condition[J]. International Journal of Rock Mechanics and Mining Sciences，2018，110：88–96.
[31] JING L，STEPHANSSON O，NORDLUND E. Study of rock joints under cyclic loading conditions[J]. Rock Mechanics and Rock Engineering，1993，26(3)：215–232.
[32] LI Y Z，LIU C H. Experimental study on the shear behavior of fully grouted bolts[J]. Construction and Building Materials，2019，223：1 123–1 134
[33] GRASSELLI G. 3D Behaviour of bolted rock joints：experimental and numerical study[J]. International Journal of Rock Mechanics and Mining Sciences，2004，42(1)：13–24.
[34] GOODMAN R E. The deformability of joints. determination of the in situ modulus of deformation of rock[M]. Philadelphia：American Society for Testing and Materials，1970：174–196.
[35] 杜修力，王作虎，詹界东. 预应力FRP筋混凝土梁的抗震性能试验研究[J]. 土木工程学报，2012，45(2)：43–50.(DU Xiuli，WANG Zuohu，ZHAN Jiedong. Experimental studies on the seismic performance of concrete beams prestressed with FRP tendons[J]. China Civil Engineering Journal，2012，45(2)：43–50.(in Chinese))
[36] DSAB C，MING L，JKA B，et al. Experimental studies on the seismic behavior of reinforced concrete beam-column joints strengthened with basalt fiber-reinforced polymer sheets[J]. Construction and Building Materials，2021，287(14)：122901.
[37] ASTM. Standard test method for flexural toughness andfirst-crack strength of fiber reinforced concrete：ASTM 1018[S]. West Conshohocken：ASTM International，1997.
[38] 邓明科，刘华政，马福栋，等. 聚乙烯醇纤维改性高延性混凝土双面剪切试验及剪切韧性评价方法[J]. 复合材料学报，2020，37(2)：231–241.(DENG Mingke LIU Huazheng，MA Fudong，et al. Double shear experiment of highly ductile concrete modified by polyvingl alcohol and shear toughness evaluation method[J]. Acta Materiae Compositae Sinica，2020，37(2)：231–241.(in Chinese))
[39] LI X，AZIZ N，MIRZAGHORBANALI A，et al. Behavior of fiber glass bolts，rock bolts and cable bolts in shear[J]. Rock Mechanics and Rock Engineering，2016，49(7)：2 723–2 735.
[40] FERRERO A M. The shear strength of reinforced rock joints[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1995，32(6)：595–605.
[41] PELLET F，EGGER P. Analytical model for the mechanical behaviour of bolted rock joints subjected to shearing[J]. Rock Mechanics and Rock Engineering，1996，29(2)：73–97.
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2022, Vol. 41 
