上游坝坡对混凝土重力坝水下接触爆炸毁伤的影响  

Influence of upstream dam slope on damage of concrete gravity dam from underwater contact explosion

作　　者：苏玉肖 王高辉[1] SU Yuxiao;WANG Gaohui(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,Hubei,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水利水电技术（中英文）》2022年第5期73-81,共9页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金重点项目(52179140,51939008);湖北省自然科学基金杰出青年项目(2021CFA093);武汉市应用基础前沿项目(2020020601012282)。

摘　　要：混凝土重力坝上游面可细分为铅直面、斜面或折面,采用不同的上游坝坡设计其抗爆性能存在较大的差异。通过建立考虑初始应力场和高应变率效应的混凝土重力坝水下接触爆炸全耦合模型,研究了水下接触爆炸荷载作用下混凝土重力坝的毁伤发展过程和破坏模式,对比分析了不同上游坝坡比下混凝土重力坝的水下爆炸毁伤形态及动力响应特性,探讨了不同上游坝面坡度对混凝土重力坝抗爆性能的影响。结果表明:混凝土重力坝上游坡度对大坝抗爆性能具有重要的影响,混凝土重力坝上游面采用斜面设计时可以有效减少坝踵部位的破坏,减小坝踵处的开裂破坏长度,小幅减小上游坝面的破坏深度和冲切破坏角度,提高大坝的整体抗爆性能。研究成果可为混凝土重力坝抗爆防护设计提供参考。The upstream face of concrete gravity dam can be subdivided into lead straight face,inclined face or folded face,while great differences are there in their explosion resistance to the adoptions of different upstream dam slope designs.Through establishing an initial stress field and high strain rate effect-considered fully coupled model for underwater contact explosion on concrete gravity dam,both the damage development process and the failure mode of concrete gravity dam under the effect of underwater contact explosion are studied,while the damage pattern and dynamic response characteristics of underwater contact explosion on concrete gravity dam under the condition of different slope ratios of upstream dam face are comparatively analyzed,and then the influences from different slope gradients on the explosion resistance performance of concrete gravity dam are discussed as well.The results show that the upstream slope gradient of concrete gravity dam has an important influence on the explosion resistance performance of the dam.When the upstream face of concrete gravity dam is designed with an inclined face,the damage at dam heel can be effectively reduced along with decrease of the cracking damage length at dam heel and small-amplitude reductions of both the damaged depth and the punch-shearing damaging angle,thus the overall explosion resistance performance of the dam can be enhanced.The study results can provide references for the explosion-proof design of concrete gravity dam.

关 键 词：混凝土重力坝 上游坝坡 水下接触爆炸 毁伤特性 坝踵 

分 类 号：TV312[水利工程—水工结构工程]