横缝灌浆高度对重力坝地震反应影响的研究

Influence of the Height of Transverse Joint Grouting on Seismic Response of Gravity Dam

采用动力时程分析法计算了龙开口碾压混凝土重力坝挡水坝段在不同横缝灌浆高度下的动力反应,通过对12种计算工况的地震反应分析,得出了以下结论:随灌浆高度的增加,坝体由横河向振动变为顺河向振动;灌浆达到一定高度时,坝体的基频不再变化;灌浆高度对坝体下部的动力反应影响较大,对上部影响较小;坝踵应力受坝体基频影响较大等,为设计者提供了参考依据。

This paper calculates the dynamic response of the Longkaikou RCC Gravity Dam in different transverse joint grouting heights by using dynamic transient method. To study the seismic response of the gravity dam, twelve cases were calculated. The results show that the transverse joint grouting heights have significant effect on the deformation and stress in gravity dam. The grouting changes dam＇s vibration modes and reduces the dam heel＇s stresses. When the grouting reaches a relevant height, the basic frequency of gravity dam and the stresses in gravity dam do not change. The height of grouting will bring big impact into the dynamic response of lower position of dam body and less impact into its upper position The stresses of dam heel are affected greatly by the basic frequency of dam body. All these provide the reference basis for designers.