Damage characteristics of underwater explosion of concrete gravity dam considering initial stress
WANG Gaohui1, GAO Zheng1, LU Wenbo1, CHEN Yeqing2, L Linmei2
1.State Key Lab of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;
2.Institute of Defense Engineering, Academy of Military Sciences, Beijing 100850, China
Abstract：The underwater explosion shock loading has a short duration and large peak value, and the damage to the dam is often completed in a short time. Therefore, the initial stress of dams has always been ignored in the existing research on dam antiknock protection. In this paper, the explicit-to-implicit conversion is used to realize the smooth transition of initial stress of dams from implicit static analysis to explicit dynamic analysis. The initial stress is taken into consideration in the establishment of concrete gravity dam fully coupled analysis model. The dynamic response characteristics of dams under different initial stress states were analyzed, the effects of gravity and hydrostatic pressure on damage characteristics of concrete gravity dams subjected to underwater explosion were discussed, the failure modes of dams subjected to underwater contact and non-contact explosion were listed. The results show that the initial stress will aggravate the punching damage, while reduce the crushing damage and tension damage.
[ 1 ] Xie L X , Lu W B , Zhang Q B , et al. Damage evolution mechanisms of rock in deep tunnels induced by cut blasting[J]. Tunnelling & Underground Space Technology Incorporating Trenchless Technology Research, 2016, 58(sep.):257-270.
[ 2 ] Yang L , Yang A , Chen S , et al. Model experimental study on the effects of in situ stresses on pre-splitting blasting damage and strain development[J]. International Journal of Rock Mechanics and Mining Sciences, 2021, 138:104587.
[ 3 ] Dong Q , Li X P , Huang J H . Model Test Study on Cylindrical Blasting Stress Wave Propagation across Jointed Rock Mass with Different Initial Stresses[J]. Advances in Civil Engineering, 2020, 2020(8):1-13.
[ 4 ] 陈明,卢文波,周创兵,等.初始地应力对隧洞开挖爆生裂隙区的影响研究[J].岩土力学,2009,30(08):2254-2258.
CHEN Ming, LU Wenbo, ZHOU Chuangbing, et al. Influence of initial in-situ stress on blasting-induced cracking zone in tunnel excavation[J]. Rock and Soil Mechanics, 2009,30(08):2254-2258.
[ 5 ] 方秦,程国亮,陈力.爆炸作用下钢筋混凝土柱非线性动力响应及破坏模式影响因素分析[J].建筑结构学报,2012,33(12):92-98.
FANG Qin, CHENG Guoliang, CHEN Li.Analysis on nonlinear dynamic responses and failure modes of RC columns under blast loads[J].Journal of Building Structures,2012,33(12):92-98.
[ 6 ] 瞿海雁,杜修力,廖维张,等. 轴压对爆炸荷载作用下柱的动力响应的影响分析[A]. 中国岩石力学与工程学会工程安全与防护分会.第一届全国工程安全与防护学术会议论文集[C].中国岩石力学与工程学会工程安全与防护分会:中国岩石力学与工程学会,2008:8.
QU Haiyan, DU Xiuli, LIAO Weizhang, et al. Dynamic response analysis of frame column under axial pressure and blast loading[A]. Engineering Safety and Protection Branch of Chinese Society of Rock Mechanics and Engineering. Proceedings of the First National Engineering Safety and Protection Conference[C]. Engineering Safety and Protection Branch of Chinese Society of Rock Mechanics and Engineering: Chinese Society of Rock Mechanics and Engineering,2008:8.
[ 7 ] 杨立云,杨仁树,许鹏,等.初始压应力场对爆生裂纹行为演化效应的实验研究[J].煤炭学报,2013,38(03):404-410.
YANG Liyun, YANG Renshu, XU Peng, et al.Experimental study on the effect of initial compression stress field on blast-induced crack behaviors[J]. Journal of China Coal Society,2013,38(03):404-410.
[ 8 ] 白羽,朱万成,魏晨慧,等.不同地应力条件下双孔爆破的数值模拟[J].岩土力学,2013,34(S1):466-471.
BAI Yu, ZHU Wancheng, WEI Chenhui, et al. Numberical simulation on two-hole blasting under different in-situ stress conditions[J]. Rock and Soil Mechanics,2013,34(S1):466-471.
[ 9 ] 张社荣,王高辉.混凝土重力坝抗爆性能及抗爆措施研究[J].水利学报,2012,43(10):1202-1213.
ZHANG Sherong, WANG Gaohui. Study on the antiknock performance and measures of concrete gravity dam[J]. Journal of Hydraulic Engineering,2012,43(10):1202-1213.
[ 10 ] 王高辉,张社荣,卢文波,等.水下爆炸冲击荷载下混凝土重力坝的破坏效应[J].水利学报,2015,46(06):723-731.
WANG Gaohui, ZHANG Sherong, LU Wenbo, et al. Damage effects of concrete gravity dams subjected to underwater explosion[J]. Journal of Hydraulic Engineering,2015,46(06):723-731.
[ 11 ] Herbert Linsbauer. Hazard potential of zones of weakness in gravity dams under impact loading conditions[J]. Frontiers of Architecture and Civil Engineering in China,2011,5(1):90-96.
[ 12 ] 李麒,王高辉,卢文波,等.库前水位对混凝土重力坝抗爆安全性能的影响[J].振动与冲击,2016,35(14):19-26.
LI Qi, WANG Gaohui, LU Wenbo, et al. Influence of water level on the antiknock safety performance of concrete gravity dam[J]. Journal of Vibration and Shock,2016,35(14):19-26.
[ 13 ] WANG Gaohui, WANG Yongxiang, LU Wenbo, et al. On the determination of the mesh size for numerical simulations of shock wave propagation in near field underwater explosion[J]. Applied Ocean Research, 2016,59:1-9.
[ 14 ] Riedel W, Thoma K , Hiermaier S, et al. Penetration of reinforced concrete by BETA2B2500 numerical analysis using a new macroscopic concrete model for hyd-rocodes [C]. 9th International Symposium, Interaction of the Effects of Munitions with Structures, Berlin-Strausberg: IBMAC, 1999:315-322.
[ 15 ] Holomquist T J, Johnson G R, Cook W H. A computational constitutive model for concrete subjective to large strains, high strain rates, and high pressures[C]. Jackson N, Dickert S. The 14th International Symposium on Ballistics, USA: American Defense Prepareness Association, 1993:591-600.
[ 16 ] Tu Z , Lu Y . Evaluation of typical concrete material models used in hydrocodes for high dynamic response simulations[J]. International Journal of Impact Engineering, 2009, 36(1):132-146.
[ 17 ] Livermore Software Technology Corporation. LS-DYNA keyword user’s manual[M]. California: Livermore Software Technology Corporation,2006.
