远场水下爆炸冲击作用下重力坝动力稳定性的简化时程分析方法  

A SIMPLIFIED TIME-HISTORY ANALYSIS METHOD FOR DYNAMIC STABILITY OF GRAVITY DAM UNDER FAR-FIELD UNDERWATER EXPLOSION IMPACT

作　　者：黄宇峰 卢文波[1,2] 王高辉[1,2] 陈明[1,2] 严鹏[1,2] HUANG Yu-feng;LU Wen-bo;WANG Gao-hui;CHEN Ming;YAN Peng(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan,Hubei 430072,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 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《工程力学》2024年第3期73-81,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51939008,52179140);湖北省自然科学基金杰出青年基金项目(2021CFA093)。

摘　　要：高坝大库的抗爆与防护是国防安全的重要研究课题。该文针对远场水下爆炸冲击作用下混凝土重力坝的稳定安全评价问题,研究了远场水下爆炸冲击波的传播及其与坝体的相互作用过程;基于波动理论和平面波假设,建立了重力坝爆炸动应力场的简化理论计算模型,最终建议了一种远场水下爆炸冲击波作用下重力坝动力稳定性的简化时程分析方法;同时结合工程实际,采用该方法对某混凝土重力坝的动力稳定性进行了分析。结果表明:在远场爆炸冲击荷载作用下,重力坝的稳定安全系数呈现出先增后减再增并最终保持恒定的变化规律;下游坝面反射形成的拉伸波与剪切波的共同作用是导致建基面稳定安全系数降低的主要原因。The antiknock security of high dams with large reservoirs is an important research topic of national defense security.Aiming at the stability and safety evaluation of gravity concrete dams subjected to underwater explosion shock,the propagation of far-field underwater explosion shock wave and its interaction with the dam are studied.Based on the wave theory and plane wave hypothesis,a theoretical calculation model for the explosive dynamic stress field of gravity dams is established.Then,a simplified time-history analysis method is proposed for the dynamic stability of gravity dams under far-field underwater explosion shock wave.Finally,the dynamic stability of a gravity concrete dam with the proposed method is analyzed.The results show that:the stability safety factor of the gravity dam increases firstly,then decreases,and finally increases to a constant under impact loading;the combined action of tensile wave and shear wave,reflected by the downstream dam surface,is the main reason for the reduction of foundation surface stability safety factor.

关 键 词：混凝土重力坝 水下爆炸 坝体动应力 动力稳定性 时程分析 

分 类 号：O383.1[理学—流体力学] TV542.5[理学—力学]