长河坝动力离心模型试验研究
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摘要
采用离心机振动台模型试验研究了长河坝在不同地震加速度下的地震加速度反应、坝顶沉降和破坏模式,分析了大坝的极限抗震能力。结果表明:坝体加速度反应随坝高的变化可以分成两个线性变化段,1/2～2/3坝高以下,坝体加速度反应较小;1/2～2/3坝高以上,坝体加速度反应明显增大,越往坝顶加速度放大系数就越大;在100年超越概率1%(峰值加速度4.30 m/s2)地震条件下,地震引起的坝顶沉降约为165～178 cm;地震破坏模式为坝顶局部滑动破坏;地震极限抗震能力5.32 m/s2。试验验证了长河坝的抗震措施是合理、可行的。
The dynamic centrifuge model test was carried out to study the seismic acceleration response,crest settlement and failure mode of Changhe Dam under the conditions of different earthquake accelerations and to analyze the ultimate earthquake resistant capacity of dam.The results showed that the acceleration-height curves of dam can be divided into two linear change sections.Acceleration response of dam body is small under 1/2～2/3 of dam height and obvious increases above 1/ 2～2/3 of dam height.The amplification coefficient of acceleration response of dam body is the largest on the top of dam.The settlement dam crest is about 165～178cm under the conditions of 100-year 1% possibility(peak acceleration of 4.30 m/s2).The mode of failure caused by earthquake is local sliding failure at the top of dam.The ultimate earthquake resistant capacity is 5.32 m/s2.The test demonstrated that the earthquake resistant measures for the Changhe Dam are reasonable and feasible.
The dynamic centrifuge model test was carried out to study the seismic acceleration response,crest settlement and failure mode of Changhe Dam under the conditions of different earthquake accelerations and to analyze the ultimate earthquake resistant capacity of dam.The results showed that the acceleration-height curves of dam can be divided into two linear change sections.Acceleration response of dam body is small under 1/2～2/3 of dam height and obvious increases above 1/ 2～2/3 of dam height.The amplification coefficient of acceleration response of dam body is the largest on the top of dam.The settlement dam crest is about 165～178cm under the conditions of 100-year 1% possibility(peak acceleration of 4.30 m/s2).The mode of failure caused by earthquake is local sliding failure at the top of dam.The ultimate earthquake resistant capacity is 5.32 m/s2.The test demonstrated that the earthquake resistant measures for the Changhe Dam are reasonable and feasible.
引文
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[2]章为民,日下部治.砂性地基地震反应离心模型试验研究[J].岩土工程学报,2001,23(1):28-31.
[3]王年香,章为民.混凝土面板堆石坝动态离心模型试验研究[J].岩土工程学报,2003,25(4):504-507.
[4]陈国兴,谢君斐,张克绪.土坝震害和抗震分析评述[J].世界地震工程,1994,(3):24-33.
[5]常亚屏.高土石坝抗震关键技术研究[J].水力发电,1998,(3):36-40.
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