The experimental instrumented bolt with fibre bragg grating force sensors

• Autorzy: Wang Tuo , Chang Jucai , Gong Peng , Shi Wenbao , Li Ning , Cheng Shixing

Identyfikatory

DOI

10.24425/ams.2020.132714

• Języki publikacji: EN

Abstrakty

EN

Monitoring the stress change of bolt and knowing the anchoring condition in a reasonable and effective way, accurately, can effectively prevent tunnel accident from breaking out. The stress of rock mass around the roadway is usually transferred to the anchor rod in the form of axial load, so it is of great significance to study the axial load of the bolt. In this paper, a full size anchoring and drawing experiment system was designed and established, innovatively, which realized the pull-out test of 2.5 m prestressed end Anchorage and the full-length Anchorage by using the new resin anchorage agent under vertical and horizontal loads. Through the application of fiber Bragg grating (FBG) sensing technology to the test of full-scale anchor rod, the axial force distribution characteristics of the end Anchorage and the full-length Anchorage anchor rod were obtained under the action of pre-tightening torque and confining rock pressure. The comparison indicates that the proportion of high stress range accounts for only 17.5% and the main bearing range is near the thread end of anchor rod, the proportion of main bearing range of end Anchorage is 83.3%, and the feasibility of FBG force-measuring anchor rod is verified in the field. The research results have certain reference value.

Słowa kluczowe

EN

fiber Bragg grating; pullout testing; anchorage systems; pre-tightening torque; bolt support

PL

siatka światłowodowa; system kotwienia; wspornik śruby

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2020
• Tom: Vol. 65, no. 1
• Strony: 179--194
• Opis fizyczny: Bibliogr. 26 poz., fot., rys., tab., wykr.

Twórcy

autor

Wang Tuo

• China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou 221116, China

autor

Chang Jucai

• Anhui University of Science and Technology, School of Energy and Safety Engineering, Key Laboratory of Safety and High-Efficiency Coal Mining, Ministry of Education

autor

Gong Peng

• China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou 221116, China

autor

Shi Wenbao

• Anhui University of Science and Technology, School of Energy and Safety Engineering, Key Laboratory of Safety and High-Efficiency Coal Mining, Ministry of Education

autor

Li Ning

• China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou 221116, China

autor

Cheng Shixing

• China University of Mining and Technology, State Key Laboratory for Geomechanics and Deep Underground Engineering, Xuzhou 221116, China

Bibliografia

• [1] Stillborg B., 1984. Experimental investigation of steel cables for rock reinforcement in hard rock. PhD thesis (Unpublished) Lulea University, Lulea.
• [2] Benmokrane B., Chennouf H.S., 1995. MitriLaboratory evaluation of cement-based grouts and grouted rock anchors. Int. J. Rock Mech. Min. Sci . 32 , 7 , 633-642.
• [3] Chen J., Hagan P.C., Saydam S., 2016. Load transfer behaviour of fully grouted cable bolts reinforced in weak rocks under tensile loading conditions. Geotech. Test. J. 39, 2, 252-263.
• [4] Chen J., Hagan P.C., Saydam S., 2017. Sample diameter effect on bonding capacity of fully grouted cable bolts. Tunn Undergr Space Technol. 68, 238-243.
• [5] C.R. Windsor, A.G., 1993. ThompsonRock reinforcement-technology, testing, design and evaluation JA Hudson (Ed.). Comprehensive rock engineering, Pergamon Press, Oxford, p. 451-484.
• [6] Cai Y., Esaki T., Jiang Y., 2004. An analytical model to predict axial load in grouted rock bolt for soft rock tunnelling. Tunn. Undergr. Space Technol. 19 , 6 , 607-618.
• [7] Chen J., Hagan P.C., Saydam S., 2016. Load transfer behaviour of fully grouted cable bolts reinforced in weak rocks under tensile loading conditions. Geotech. Test J . 39 , 2 , 252-263.
• [8] Chai Jing, Zhao W.H. et al., 2012. Pull out tests of figer Bragg grating sensor fitted bolts. Journal of China University of Mining and Technology 41, 5, 719-724.
• [9] Ren F.F., Yang Z.J., Chen J.F., Chen W.W., 2010. An analytical analysis of the full-range behaviour of grouted rockbolts based on a tri-linear bond-slip model. Constr. Build. Mater. 24, 361-370.
• [10] Forbes B., Vlachopoulos N., Hyett Andrew J., Diederichs Mark S., 2017. A new optical sensing technique for monitoring shear of rock bolts. Tunn. Undergr. Space Technol. 66, 34-46.
• [11] Gao F., Kang H., 2008. Effect of pre-tensioned rock bolts on stress redistribution around a roadway – insight from numerical modeling. J. China Univ. Min. Technol. 18 , 509-515.
• [12] Hillyer J., 2012. Influence of installation method and resin properties on rock bolt erformance in underground coal mines. Undergraduate thesis. UOW , p. 1109.
• [13] Kang Hongpu, Wang Jinhua, Lin Jian, 2010. Case studies of rock bolting in coal mine roadways. Journal of Rock Mechanics and Engineering 29 , 04, 649-664.
• [14] Kang H., Lin J., Wu Y., 2009. Development of high pretensioned and intensive supporting system and its application in coal mine roadways. Proc. Earth Planet. Sci . 1, 479-485.
• [15] Li CC., 2007. A Practical problem with threaded rebar bolts in reinforcing largely deformed rock masses. Rock Mechanics and Rock Engineering 40 , 5 , 519-24.
• [16] Li L., Hagan, P.C., Saydam, S., Hebblewhite, B., 2016. Shear resistance contribution of support systems in double shear tests. Tun. Undergr. Space Technol. 56, 168-175.
• [17] Li Chong, XU Jin-Hai., 2013. The mechanical characteristics analysis of fully anchored pre-stressed bolts in coal mines. Journal of Mining and Safety Engineering 30 , 2 , 188-224.
• [18] López-Higuera J.M., Cobo L.R., Incera A.Q., Cobo A., 2011. Fiber optic sensors in structural health monitoring. Journal of Lightwave Technolog 29, 4, 587-608.
• [19] Li Shucai, Wang Hongtao, Wang Qi et al., 2014. Limit analysis of failuremechanism of prestressed anchor cable based on Hoek-Brown fail-ure criterion. Rock and Soil Mechanics 35, 2, 466-473.
• [20] Vlachopoulos N. et al., 2018. Utilizing a novel fiber optic technology to capture the axial responses of fully grouted rock bolts. Journal of Rock Mechanics and Geotechnical Engineering 10, 02, 222-235.
• [21] Patrick H.J., 2000. Self aligning bipolar bend transducer based on long period grating written in core fiber. Electronics Lett. 36, 21, 1763-1764.
• [22] Phillips S.H.E., 1970. Factors affecting the design of anchorages in rock. London: Cementation Research Ltd.
• [23] Stillborg B., 1986. Professional Users Handbook for Rock Bolting. Clausthal-Zellerfeld, Germany: Trans Tech Publications.
• [24] Wang Tuo, Chang Jucai etc., 2016. Research on bolt-mesh-anchor support technology in deep mine with hard roof. Coal Engineering 48, 07, 50-52.
• [25] Habel W.R., Krebber K., 2011. Fiber-optic sensor applications in civil and geotechnical engineering Photon. Sens. 1, 3, 268-280.
• [26] Zhang Guihua, Chai Jing et al., 2014. Study on stress distribution of bolt in pullout test based on FBG. Journal of Mining and Safety Engineering 31, 04, 635-639.

Uwagi

PL

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)