土石坝坝顶加固的永久变形机理及其离心模型试验验证

Deformation mechanism study of top reinforcement of the earth-rock-fill dam and its verification by the centrifuge model test

摘要: 首先介绍了汶川特大地震中紫坪铺大坝永久变形原型观测的研究结果,根据紫坪铺大坝汶川地震实测结果,发现地震永久变形主要产生于大坝的上部,从地震永久变形的发生机理论证了坝顶加固技术的合理性与科学性.然后介绍了土石坝离心模型动力试验的研究成果,通过离心模型试验验证了坝顶加固的有效性与合理性.通过比较,表明离心模型试验得到的大坝变形分布形态、大坝外形轮廓变化、变形矢量等关键技术特性与墨西哥El Infiernillo土石坝及紫坪铺汶川地震实测结果吻合很好,证实了离心模型试验的技术优势.

Abstract: To deal with the energy crisis,several large earth-rock-fill dams will be constructed in the western area,which is a high risk region of the strong earthquake.The mechanism study on anti-earthquake and disaster reduction is very important.In this paper,based on the monitoring data of Zipingpu concrete face rock-fill dam(CFRD) after Wenchuan earthquake,the permanent deformation mechanism of the top reinforcement of the earth-rock-fill dam is analyzed and the rationality of the top reinforcement technology ha...