Experimental Study on Dynamic Mechanical Properties of Sprayed Concrete-Surrounding Rock Combined Body
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摘要
To investigate the dynamic response problem of the double medium formed by the adherence of sprayed concrete and surrounding rock in the tunnel,a split Hopkinson pressure bar of 75 mm in diameter was adopted at the ages of 3,7 and 10 d. Experimental results showed that dynamic compressive strength and dynamic increase factors( DIF) of the combined bodies increase with the strain rate. With the growth of strain rate,the critical strain of the combined bodies first increases,then deceases. Furthermore,the combined bodies of 3 d reveal the plastic property and brittle property for 7 d and 10 d when the strain rate is over 80/s.The failure characteristic of the sprayed concrete changes from tearing strain damage to crushing damage as the growth of strain rate,and the failure characteristic of rock presents the tensile failure mode as demonstrated by the scanning electron microscope( SEM).
To investigate the dynamic response problem of the double medium formed by the adherence of sprayed concrete and surrounding rock in the tunnel,a split Hopkinson pressure bar of 75 mm in diameter was adopted at the ages of 3,7 and 10 d. Experimental results showed that dynamic compressive strength and dynamic increase factors( DIF) of the combined bodies increase with the strain rate. With the growth of strain rate,the critical strain of the combined bodies first increases,then deceases. Furthermore,the combined bodies of 3 d reveal the plastic property and brittle property for 7 d and 10 d when the strain rate is over 80/s.The failure characteristic of the sprayed concrete changes from tearing strain damage to crushing damage as the growth of strain rate,and the failure characteristic of rock presents the tensile failure mode as demonstrated by the scanning electron microscope( SEM).
To investigate the dynamic response problem of the double medium formed by the adherence of sprayed concrete and surrounding rock in the tunnel,a split Hopkinson pressure bar of 75 mm in diameter was adopted at the ages of 3,7 and 10 d. Experimental results showed that dynamic compressive strength and dynamic increase factors( DIF) of the combined bodies increase with the strain rate. With the growth of strain rate,the critical strain of the combined bodies first increases,then deceases. Furthermore,the combined bodies of 3 d reveal the plastic property and brittle property for 7 d and 10 d when the strain rate is over 80/s.The failure characteristic of the sprayed concrete changes from tearing strain damage to crushing damage as the growth of strain rate,and the failure characteristic of rock presents the tensile failure mode as demonstrated by the scanning electron microscope( SEM).
引文
[1]Abrams D A.Effect of rate of application of load on the compressive strength of concrete[C]∥Proceedings of ASTM,1917,17:364-377.
[2]Jones P G,Richart F E.The effect of testing speed on strength and elastic properties of concrete[C]∥Proceedings of ASTM,1936,36(Part II):380-392.
[3]Friedman M,Perkins R D,Greens J.Observation of brittle-deformation features at the maximum stress of Westerly granite and Solenhofen limestone[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1970,7(3):297-302.
[4]Ross C A,Tedesco J W,Kuennen S T.Effects of strain rate on concrete strength[J].Materials Journal,1995,92(1):37-47.
[5]Li X B,Wang S M,Gong F Q,et al.Experimental study of damage properties of different ages concrete under multiple impact loads[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(12):2465-2472.
[6]Li Xibing,Wang Shiming,Zhou Tao,et al.Mechanical properties of early ages concrete under different impact loading conditions[J].The Chinese Journal of Nonferrous Metals,2015,25(6):1672-1677.
[7]Wang Shiming,Li Xibing,Gong Fengqiang,et al.Experimental study on mechanical properties of different ages concrete under static and dynamic load[J].Engineering Mechanics,2013,30(2):143-149.(in Chinese)
[8]Wang Shiming.Experimental study on the mechanical properties and damage performance of early concrete under dynamic loading[D].Changsha:Central South University,2014.(in Chinese)
[9]Hong Liang,Li Xibing,Ma Chunde,et al.Study on size effect of rock dynamic strength and strain rate sensitivity[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):526-533.(in Chinese)
[10]Gong Fengqiang.Experimental study of rock mechanical properties under coupled static-dynamic loads and dynamic strength criterion[D].Changsha:Central South U-niversity,2010.(in Chinese)
[11]You Yechao,Li Erbing,Tan Yuehu,et al.Analysis on dynamic properties and failure characteristics of salt rock based on energy dissipation principle[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(4):843-851.(in Chinese)
[12]Kolsky H.An investigation of the mechanical properties of materials at very high rates of loading[J].Proceedings of the Physical Society,Section B,1949,62(11):676.
[13]Hong L.Size effect on strength and energy dissipation in fracture of rock under impact loads[D].Changsha:Central South University,2008.(in Chinese)
[14]Li X B,Wang S M,Weng L,et al.Damage constitutive model of different age concretes under impact load[J].Journal of Central South University,2015,22(2):693-700.
[15]Grote D L,Park S W,Zhou M.Dynamic behavior of concrete at high strain rates and pressures:I.Experimental characterization[J].International Journal of Impact Engineering,2001,25(9):869-886.
[16]Li H B,Zhao J,Li J R,et al.Experimental studies on the strength of different rock types under dynamic compression[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(S1):68-73.
[17]Ross C A,Tedesco J W,Kuennen S T.Effects of strain rate on concrete strength[J].Materials Journal,1995,92(1):37-47.
[18]Li Q M,Meng H.About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test[J].International Journal of Solids and Structures,2003,40(2):343-360.
[19]Guo Y B,Gao G F,Jing L,et al.Response of highstrength concrete to dynamic compressive loading[J].International Journal of Impact Engineering,2017,108:114-135.
[20]Zhang M,Wu H J,Li Q M,et al.Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests.Part I:Experiments[J].International Journal of Impact Engineering,2009,36(12):1327-1334.
[21]Flores-Johnson E A,Li Q M.Structural effects on compressive strength enhancement of concrete-like materials in a split Hopkinson pressure bar test[J].International Journal of Impact Engineering,2017,109:408-418.
[22]Forrestal M J,Wright T W,Chen W.The effect of radial inertia on brittle samples during the split Hopkinson pressure bar test[J].International Journal of Impact Engineering,2007,34(3):405-411.
[23]Hartley R S,Cloete T J,Nurick G N.An experimental assessment of friction effects in the split Hopkinson pressure bar using the ring compression test[J].International Journal of Impact Engineering,2007,34(10):1705-1728.
[24]Wang Shiming,Li Xibing,Gong Fengqiang,et al.Experimental study on mechanical properties of different ages concrete under static and dynamic load[J].Engineering Mechanics,2013,30(2):143-149.(in Chinese)
[25]Xie H P.Tensile failure of local damage of rock material[J].Chinese Journal of Rock Mechanics and Engineering,1988,7(2):147-154.(in Chinese)
[26]Xie H P,Chen Z D.Analysis of rock fracture micromechanism[J].Journal of China Coal Society,1989(2):57-67.(in Chinese)
[27]Liu X M,Lee C F.Micro-failure mechanism analysis and test study for rock failure surface[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(6):509-513.(in Chinese)(Wang)
[2]Jones P G,Richart F E.The effect of testing speed on strength and elastic properties of concrete[C]∥Proceedings of ASTM,1936,36(Part II):380-392.
[3]Friedman M,Perkins R D,Greens J.Observation of brittle-deformation features at the maximum stress of Westerly granite and Solenhofen limestone[J].International Journal of Rock Mechanics and Mining Sciences&Geomechanics Abstracts,1970,7(3):297-302.
[4]Ross C A,Tedesco J W,Kuennen S T.Effects of strain rate on concrete strength[J].Materials Journal,1995,92(1):37-47.
[5]Li X B,Wang S M,Gong F Q,et al.Experimental study of damage properties of different ages concrete under multiple impact loads[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(12):2465-2472.
[6]Li Xibing,Wang Shiming,Zhou Tao,et al.Mechanical properties of early ages concrete under different impact loading conditions[J].The Chinese Journal of Nonferrous Metals,2015,25(6):1672-1677.
[7]Wang Shiming,Li Xibing,Gong Fengqiang,et al.Experimental study on mechanical properties of different ages concrete under static and dynamic load[J].Engineering Mechanics,2013,30(2):143-149.(in Chinese)
[8]Wang Shiming.Experimental study on the mechanical properties and damage performance of early concrete under dynamic loading[D].Changsha:Central South University,2014.(in Chinese)
[9]Hong Liang,Li Xibing,Ma Chunde,et al.Study on size effect of rock dynamic strength and strain rate sensitivity[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(3):526-533.(in Chinese)
[10]Gong Fengqiang.Experimental study of rock mechanical properties under coupled static-dynamic loads and dynamic strength criterion[D].Changsha:Central South U-niversity,2010.(in Chinese)
[11]You Yechao,Li Erbing,Tan Yuehu,et al.Analysis on dynamic properties and failure characteristics of salt rock based on energy dissipation principle[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(4):843-851.(in Chinese)
[12]Kolsky H.An investigation of the mechanical properties of materials at very high rates of loading[J].Proceedings of the Physical Society,Section B,1949,62(11):676.
[13]Hong L.Size effect on strength and energy dissipation in fracture of rock under impact loads[D].Changsha:Central South University,2008.(in Chinese)
[14]Li X B,Wang S M,Weng L,et al.Damage constitutive model of different age concretes under impact load[J].Journal of Central South University,2015,22(2):693-700.
[15]Grote D L,Park S W,Zhou M.Dynamic behavior of concrete at high strain rates and pressures:I.Experimental characterization[J].International Journal of Impact Engineering,2001,25(9):869-886.
[16]Li H B,Zhao J,Li J R,et al.Experimental studies on the strength of different rock types under dynamic compression[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(S1):68-73.
[17]Ross C A,Tedesco J W,Kuennen S T.Effects of strain rate on concrete strength[J].Materials Journal,1995,92(1):37-47.
[18]Li Q M,Meng H.About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test[J].International Journal of Solids and Structures,2003,40(2):343-360.
[19]Guo Y B,Gao G F,Jing L,et al.Response of highstrength concrete to dynamic compressive loading[J].International Journal of Impact Engineering,2017,108:114-135.
[20]Zhang M,Wu H J,Li Q M,et al.Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests.Part I:Experiments[J].International Journal of Impact Engineering,2009,36(12):1327-1334.
[21]Flores-Johnson E A,Li Q M.Structural effects on compressive strength enhancement of concrete-like materials in a split Hopkinson pressure bar test[J].International Journal of Impact Engineering,2017,109:408-418.
[22]Forrestal M J,Wright T W,Chen W.The effect of radial inertia on brittle samples during the split Hopkinson pressure bar test[J].International Journal of Impact Engineering,2007,34(3):405-411.
[23]Hartley R S,Cloete T J,Nurick G N.An experimental assessment of friction effects in the split Hopkinson pressure bar using the ring compression test[J].International Journal of Impact Engineering,2007,34(10):1705-1728.
[24]Wang Shiming,Li Xibing,Gong Fengqiang,et al.Experimental study on mechanical properties of different ages concrete under static and dynamic load[J].Engineering Mechanics,2013,30(2):143-149.(in Chinese)
[25]Xie H P.Tensile failure of local damage of rock material[J].Chinese Journal of Rock Mechanics and Engineering,1988,7(2):147-154.(in Chinese)
[26]Xie H P,Chen Z D.Analysis of rock fracture micromechanism[J].Journal of China Coal Society,1989(2):57-67.(in Chinese)
[27]Liu X M,Lee C F.Micro-failure mechanism analysis and test study for rock failure surface[J].Chinese Journal of Rock Mechanics and Engineering,1997,16(6):509-513.(in Chinese)(Wang)