横缝灌浆高度对重力坝地震反应影响的研究
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摘要
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.
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.
引文
[1]胡杰安.混凝土拱坝及重力坝接缝设计与构造[M].北京:中国水利水电出版社,1986.
[2]涂劲,侯顺载,陈厚群.纵缝对重力坝地震反应影响的研究[J].水利学报,2000,(12):53-58.
[3]张贵科,徐卫亚.重力坝纵向非连续接触的数值模拟[J].水利学报,2005,(36):982-987.
[4]胡群革.重力坝不灌浆斜缝的工作形态分析[J].大坝观测与土工测试,2001,(25):21-27.
[5]章青,卓家寿,邵国建.混凝土坝横缝接触问题的变分不等式解法[J].水力发电,1998,(11):14-17.
[6]邓良军,张杰,李双宝.金安桥水电站碾压混凝土重力坝抗震研究[J].工程抗震与加固改造,2005,(27):181-185.
[7]祁庆和.水工建筑物[M].北京:中国水利水电出版社,1996.
[8]杨建红.汾河二库坝体横缝的接缝灌浆[J].山西水利科技,2003,(2):51-52.
[9]DL 5073—2000,水工建筑物抗震设计规范[S].
[2]涂劲,侯顺载,陈厚群.纵缝对重力坝地震反应影响的研究[J].水利学报,2000,(12):53-58.
[3]张贵科,徐卫亚.重力坝纵向非连续接触的数值模拟[J].水利学报,2005,(36):982-987.
[4]胡群革.重力坝不灌浆斜缝的工作形态分析[J].大坝观测与土工测试,2001,(25):21-27.
[5]章青,卓家寿,邵国建.混凝土坝横缝接触问题的变分不等式解法[J].水力发电,1998,(11):14-17.
[6]邓良军,张杰,李双宝.金安桥水电站碾压混凝土重力坝抗震研究[J].工程抗震与加固改造,2005,(27):181-185.
[7]祁庆和.水工建筑物[M].北京:中国水利水电出版社,1996.
[8]杨建红.汾河二库坝体横缝的接缝灌浆[J].山西水利科技,2003,(2):51-52.
[9]DL 5073—2000,水工建筑物抗震设计规范[S].
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