Experiment on Reinforcement of Jointed Rock Mass by Carbon Fiber Cement-based Composite Material

DENG Hua-feng1 XIAO Yao1 XU Tao1 ZHI Yong-yan1 DUAN Ling-ling1 PAN Deng1

(1.Hubei Key Laboratory of Disaster Prevention and Mitigation, China Three Gorges University, Yichang, Hubei, China 443002)

【Abstract】In order to investigate the reinforcement effect, mechanism, and the optimum carbon fiber content of carbon fiber cement-based composite material for jointed rock mass, taking 0, 0.25%, 0.50%, 0.75%, 1.00% as five different kinds of carbon fiber content into consideration, we conducted the direct shear tests on the rock specimens before and after reinforcement by dint of the ultrafine cement, fly ash, mineral powder, silica fume, and other repair materials. The results showed that the shear stress-shear displacement curves of the jointed rock specimens before and after reinforcement were obviously changed, which were transformed from the absence of peak intensity to peak intensity curves. There were significant strain-softening stages and residual strength stages. With the carbon fiber content increased from 0 to 1.00%, the peak shear strength and residual shear strength of jointed rock specimens under five kinds of normal stress cases increased by 13.0%–54.1% and 0.61%–44.7%, respectively. The shear stiffness increased from 32.4% to 216.8%. The cohesion and friction angle of the shear strength parameters increased by 3.4%–20.4% and 127.3%–266.5%, respectively. In comparison, when the carbon fiber content was 0.75%, the comprehensive enhancement effect of the shear resistance after reinforcement was most obvious. According to the morphological features of joints and shear failure characteristics after reinforcement, it is found that the cement composite material had a good filling and cementation effect on the joint surfaces. When the carbon fibers were incorporated into the cement-based composite material, on the one hand, it is similar to “reinforcement” material, and the strength and integrity of the slurry can be further enhanced on the basis of the pure cement slurry to limit the development of micro-cracks during the shear process of the joint surface. On the other hand, carbon fiber provided a good “anchorage” effect on the sheared slurry, which can further increase the cementing property of the slurry and the joint surfaces to significantly increase the shear resistance of the slurry itself and the cementation surface. Hence, after reinforcement, the comprehensive shear resistance of the jointed rock mass can be improved significantly.

【Keywords】 road engineering; reinforcement mechanism; direct shear test; jointed rock mass; carbon fiber;


【Funds】 Hubei Provincial Natural Science Foundation of Key Projects (2015CFA140) National Natural Science Foundation of China (51679127, 51439003) Open Research Foundation of Hubei Key Laboratory of Disaster Prevention and Mitigation in China Three Gorges University (016KJZ12) Three Gorges University 2015 Master’s Degree Thesis Excellent Fund (2017YPY016)

Download this article


    [1] SHEN Ming-rong, CHEN Jian-feng. Rock Mechanics [M]. 2nd ed. Shanghai: Tongji University Press, 2015 (in Chinese).

    [2] ZHANG Guang-dou. Lessons from the Failure of Malpassit Arch Dam [J]. Journal of Hydroelectric Engineering, 1998 (4) : 96–98 (in Chinese).

    [3] ZHONG Li-xun. Enlightenments from the Accident of Vaiont Landslide in Italy [J]. The Chinese Journal of Geological Hazard and Control, 1994, 5 (2): 77–84 (in Chinese).

    [4] DU Bo-hui. Tangyanguang Landslide of Zhexi Reservoir: The First Large-scale Landslide Occurred at Early Stage of Impoundment in China [C]//Editorial Committee of the Proceedings of the Second Session of the National Geological and Engineering Academic Convention. Proceedings of the Second Session of the National Geological and Engineering Academic Convention (Volume One). Beijing: Science Press, 2006: 918–922 (in Chinese).

    [5] LIU Chuan-zheng. Mechanism Analysis on the Jiweishan Rockfall Disaster Happened in Wulong, Chongqing, June 5, 2009 [J]. Journal of Engineering Geology, 2010, 18 (3) : 297–304 (in Chinese).

    [6] CHAI Xin-jun, QIAN Qi-hu, LUO Si-hai, et al. Historical Earthen Kiln Reinforcement with Micro-soil Nailing and Mini-chemical Grouting Techniques [J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27 (2): 347–353 (in Chinese).

    [7] XU Hong-fa, GENG Han-sheng, LI Chao-fu, et al. Estimating Strength of Grouting Reinforced Bodies in Broken Rock Mass [J]. Chinese Journal of Geotechnical Engineering, 2013, 35 (11) : 2018–2022 (in Chinese).

    [8] ZHANG Zhi-pei, LIU Xu, XU Han-min, et al. Experimental Studies on Grouting Quality Examination of Gob of Coalmine [J]. Chinese Journal of Geotechnical Engineering, 2005, 27 (5) : 604–606 (in Chinese).

    [9] DING Yue-jun. Reinforcement Treatment of Curtain Grouting in Sodium Ditch Rock [J]. Yunnan Water Power, 2015, 31 (3) : 78–79, 87 (in Chinese).

    [10] LIU Jian, HU Nan-qi, XU Bao-jun, et al. Study on Cement-based Seepage Grouting Materials for Earthrock Dam [J]. Journal of Shandong University: Engineering Science, 2017, 47 (6) : 9–15 (in Chinese).

    [11] LI Sen-sen. Property Optimization Test of New Cement-based Grouting Material [J]. Coal Technology, 2017, 36 (8) : 169–170 (in Chinese).

    [12] WANG Gang, PEI Xiang-jun, YANG Ke. An Experimental Study on Carbon Fiber Reinforced Grouting Material [J]. Journal of Geological Hazards and Environment Preservation, 2013, 24 (3) : 109–112 (in Chinese).

    [13] LOU T, LOPES S M R, LOPES A V. Time-dependent Behavior of Concrete Beams Prestressed with Bonded AFRP Tendons [J]. Composites Part B, 2016, 97: 1–8.

    [14] KWON M, SEO H, KIM J. Seismic Performance of RC-frame Structures with GFRP Infill Panels [J]. Composite Structures, 2017, 160: 722–733.

    [15] MOSTOFINEJAD D, HOSSEINI S A, RAZAVI S B. Influence of Different Bonding and Wrapping Techniques on Performance of Beams Strengthened in Shear Using CFRP Reinforcement [J]. Construction and Building Materials, 2016, 116: 310–320.

    [16] ZHANG Yun-hua, YAO Li-ping, NONG Chang-fa, et al. Mechanical Properties of Bamboo Charcoal Fiber Reinforced Cement-based Composite [J]. Journal of Civil Engineering and Management, 2017, 34 (2): 91–94 (in Chinese).

    [17] SHI Jian-li, TIAN Li, ZHAO Tie-jun, et al. Experimental Study on the Tensile Properties of Natural Fiber Reinforced Cement-based Materials [J]. China Concrete and Cement Products, 2015 (3): 55–57 (in Chinese).

    [18] LEI J S, ZHOU Z P, SUN Z T. Research on Steel Fiber Reinforced Concrete Mix Proportion Based on the Theory of the Orthogonal Experiment [J]. International Journal of Engineering Practical Research, 2015, 4 (1) : 18–21.

    [19] WANG Jian-hui, ZHANG Hao-bo, SANG Guo-chen. Research on Concrete Crack Repair Material [J]. New Building Materials, 2012 (5): 32–35 (in Chinese).

    [20] ZHU Hua, CHEN Xiao-long, ZHANG Xiao-hua, et al. Development and Application of Concrete Crack Repair Agent [J]. China Concrete and Cement Products, 2015 (4): 25–28 (in Chinese).

    [21] LI Y, BAI W L, SHI T F. A Study of the Bonding Performance of Magnesium Phosphate Cement on Mortar and Concrete [J]. Construction and Building Materials, 2017, 142: 459–468.

    [22] GAO Hong-xia, NI Xiu-quan. Talking About Crack Repair Method of Concrete Structure [J]. Sichuan Architecture, 2008, 28 (6): 183–184 (in Chinese).

    [23] JIA Xing-wen, SI Duan-ke, ZHANG Xin, et al. Mechanical Properties of Carbon Fiber Reinforced Magnesium Phosphate Cement Mortar [J]. Materials Review, 2016, 30 (11): 138–142 (in Chinese).

    [24] XIA Cai-chu, SONG Ying-long, TANG Zhi-cheng, et al. Shear Strength and Morphology Characteristic Evolution of Joint Surface Under Cyclic Loads [J]. Journal of Central South University: Science and Technology, 2012, 43 (9): 3589–3594 (in Chinese).

    [25] YANG Li-juan. Study on the Self-penetration Repairing Material of Concrete Crack [D]. Yangzhou: Yangzhou University, 2012 (in Chinese).

    [26] LI Bing-liang, PENG Lei, WANG Xiao-yan. Study on the Mechanical Properties of Carbon Fiber Reinforced Cement Mortar [J]. Sichuan Building Materials, 2015, 41 (5) : 31–32 (in Chinese).

This Article


CN: 61-1313/U

Vol 31, No. 02, Pages 242-251

February 2018


Article Outline


  • 0 Introduction
  • 1 Design of test plan
  • 2 Analysis of reinforcement effect of jointed rock mass
  • 3 Analysis of reinforcement mechanism of jointed rock mass
  • 4 Conclusions
  • References