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Abstract: Dam structures are prime targets during wars, and a tragedy is likely to happen in a populated area downstream of a dam exposed to explosions. However, experimental investigations of the failure of a concrete gravity dam subjected to underwater explosion (UNDEX) are extremely scarce. In this study, centrifuge tests and numerical simulations were performed to investigate the failure of a concrete gravity dam subjected to a near-field UNDEX. The results revealed the existence of two tensile fractures inside the dam, one in the upper part and the other in the lower part. Due to the narrowness of the upper part, there were coupled effects of bending tensile loads in the upstream face and a reflected tensile stress wave in the downstream face, resulting in severe tensile damage to the upper part in both the upstream and downstream faces. The fracture in the lower part was measured at around one third of the height of the dam. This fracture was produced mainly by the bending tensile loads in the upstream face. Driven by those loads, this fracture started from the upstream face and developed towards the downstream face, with a horizontal angle of about 15°. The underlying mechanisms behind the two tensile fractures were confirmed by recorded strain histories. The dam failures presented in this study are similar to those produced in historical wars, in which dams were under similar attack scenarios.

混凝土重力坝水下爆炸荷载作用下的弯曲破坏

[1]Benson DJ, 1992. Computational methods in Lagrangian and Eulerian hydrocodes. Computer Methods in Applied Mechanics and Engineering, 99(2-3):235-394.

[2]Cadoni E, Labibes K, Berra M, et al., 2000. High-strain-rate tensile behaviour of concrete. Magazine of Concrete Research, 52(5):365-370.

[3]Cadoni E, Labibes K, Albertini C, et al., 2001. Strain-rate effect on the tensile behaviour of concrete at different relative humidity levels. Materials and Structures, 34(1):21-26.

[4]Chen JY, Liu XP, Xu Q, 2017. Numerical simulation analysis of damage mode of concrete gravity dam under close-in explosion. KSCE Journal of Civil Engineering, 21(1):397-407.

[5]Cole RH, Weller R, 1948. Underwater explosions. Physics Today, 1(6):35.

[6]Erzar B, Forquin P, 2011. Free water influence on the dynamic tensile behaviour of concrete. Applied Mechanics and Materials, 82:45-50.

[7]Hallquist JO, 2006. LS-DYNA Theory Manual. Lawrence Livermore National Laboratory, University of California, California, USA.

[8]Hartmann T, Pietzsch A, Gebbeken N, 2010. A hydrocode material model for concrete. International Journal of Protective Structures, 1(4):443-468.

[9]Hu J, Chen ZY, Zhang XD, et al., 2017. Underwater explosion in centrifuge part I: validation and calibration of scaling laws. Science China Technological Sciences, 60(11):1638-1657.

[10]Hu J, Chen ZY, Zhang XD, et al., 2020a. Investigation of a new shock factor to assess an air-backed structure subjected to a spherical wave caused by an underwater explosion. Journal of Structural Engineering, 146(10):04020220.

[11]Hu J, Chen ZY, Zhang XD, et al., 2020b. Modeling bubble motions by underwater explosion in a centrifuge. Journal of Fluids Engineering, 142(4):041401.

[12]Huang XP, Kong XZ, Hu J, et al., 2020a. The influence of free water content on ballistic performances of concrete targets. International Journal of Impact Engineering, 139: 103530.

[13]Huang XP, Kong XZ, Chen ZY, et al., 2020b. Equation of state for saturated concrete: a mesoscopic study. International Journal of Impact Engineering, 144:103669.

[14]Huang XP, Kong XZ, Chen ZY, et al., 2020c. A computational constitutive model for rock in hydrocode. International Journal of Impact Engineering, 145:103687.

[15]Kalateh F, 2019. Dynamic failure analysis of concrete dams under air blast using coupled Euler-Lagrange finite element method. Frontiers of Structural and Civil Engineering, 13(1):15-37.

[16]Kong XZ, Fang Q, Chen L, et al., 2018. A new material model for concrete subjected to intense dynamic loadings. International Journal of Impact Engineering, 120:60-78.

[17]Li Q, Wang GH, Lu WB, et al., 2018. Failure modes and effect analysis of concrete gravity dams subjected to underwater contact explosion considering the hydrostatic pressure. Engineering Failure Analysis, 85:62-76.

[18]Lu L, Li X, Zhou J, 2014. Study of damage to a high concrete dam subjected to underwater shock waves. Earthquake Engineering and Engineering Vibration, 13(2):337-346.

[19]Lu L, Li X, Zhou J, et al., 2016. Numerical simulation of shock response and dynamic fracture of a concrete dam subjected to impact load. Earth Sciences Research Journal, 20(1):M1-M6.

[20]Rajendran R, Lee JM, 2009. Blast loaded plates. Marine Structures, 22(2):99-127.

[21]Ren XD, Shao Y, 2019. Numerical investigation on damage of concrete gravity dam during noncontact underwater explosion. Journal of Performance of Constructed Facilities, 33(6):04019066.

[22]Ross CA, Jerome DM, Tedesco JW, et al., 1996. Moisture and strain rate effects on concrete strength. ACI Materials Journal, 93(3):293-300.

[23]Saadatfar S, Zahmatkesh A, 2018. Evaluation of underwater blast on concrete gravity dams using three-dimensional finite-element model. AUT Journal of Civil Engineering, 2(1):69-78.

[24]Schuler H, Mayrhofer C, Thoma K, 2006. Spall experiments for the measurement of the tensile strength and fracture energy of concrete at high strain rates. International Journal of Impact Engineering, 32(10):1635-1650.

[25]Snay HG, 1962. Underwater Explosion Phenomena: the Parameters of Migrating Bubbles. Technical Report NAVORD 4185, Naval Ordnance Laboratory, White Oak, USA.

[26]Snay HG, Tipton RV, 1963. Charts for the Parameters of Migrating Explosion Bubbles. NOLTR Report 62-184, Naval Ordnance Laboratory, White Oak, USA.

[27]Swisdak Jr MM, 1978. Explosion Effects and Properties: Part II–Explosion Effects in Water. NSWC/WOL TR 76-116, Naval Surface Weapons Center, Silver Spring, USA.

[28]Vanadit-Ellis W, Davis LK, 2010. Physical modeling of concrete gravity dam vulnerability to explosions. Proceedings of the 2010 International WaterSide Security Conference, p.1-11.

[29]Wang GH, Zhang SR, 2014. Damage prediction of concrete gravity dams subjected to underwater explosion shock loading. Engineering Failure Analysis, 39:72-91.

[30]Wang GH, Lu WB, Yang GD, et al., 2020. A state-of-the-art review on blast resistance and protection of high dams to blast loads. International Journal of Impact Engineering, 139:103529.

[31]Xu H, Wen HM, 2013. Semi-empirical equations for the dynamic strength enhancement of concrete-like materials. International Journal of Impact Engineering, 60:76-81.

[32]Xu Q, Chen JY, Li J, et al., 2013. Coupled elasto-plasticity damage constitutive models for concrete. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 14(4):256-267.

[33]Yan DM, Lin G, 2006. Dynamic properties of concrete in direct tension. Cement and Concrete Research, 36(7):1371-1378.

[34]Yang GD, Wang GH, Lu WB, et al., 2018. A SPH-Lagrangian-Eulerian approach for the simulation of concrete gravity dams under combined effects of penetration and explosion. KSCE Journal of Civil Engineering, 22(8):3085-3101.

[35]Zhang SR, Wang GH, Wang C, et al., 2014. Numerical simulation of failure modes of concrete gravity dams subjected to underwater explosion. Engineering Failure Analysis, 36:49-64.

[36]Zheng D, Li QB, 2004. An explanation for rate effect of concrete strength based on fracture toughness including free water viscosity. Engineering Fracture Mechanics, 71(16-17):2319-2327.