王家店水库混凝土重力坝爆破地震反应分析

EXPLOSION EARTHQUAKE RESPONSE ANALYSIS OF CONCRETE GRAVITY DAM OF WANGJIADIAN RESERVOIR

通过两种途径分析了王家店水库重力坝在爆破时的地震效应。一是利用实测坝基地振动作为地面运动输入,对坝体进行了地震反应和爆破强度分析,包括具体的振动特性和动力反应。二是通过振动速度分析了坝体混凝土可能产生的最大应力,并与极限强度做了比较,给出了该混凝土重力坝爆破振动控制标准。最后讨论了重复爆破时对大坝可解产生的疲劳影响。上述分析结果表明:最大药量控制在300kg范围内,距大坝1700m处的爆破研究所进行的常年爆炸加工生产,对大坝是安全的,由重复爆炸对大坝引起的低周疲劳影响可忽略。

Explosion—generated seismic effects of the gravity dam of Wangjiadian reservoir have been analyzed by two ways. The first way is to measure practically vibration of the dam base as the input of ground motion for the dam body to make analysis of seismic response and explosion intensity, which includes vibration feature and dynamic response of the dam body. The second is to analyse possible generated maximal stress in the dam body by vibration velocity, and to give control standard of explosion vibration of the concrete gravity dam comparing with limit intensity. Finally, for the dam to generate possible fatigue influence is discussed when explosion occur repeatedly.