高土石坝复合加筋抗震措施大型振动台模型试验与数值模拟  

Large-scale shaking table model tests and numerical simulation for composite reinforcement aseismic measure of high earth rockfill dam

作　　者：杨星 余挺 陈鹏 袁正鑫 YANG Xing;YU Ting;CHEN Peng;YUAN ZhengXin(Power China Chengdu Engineering Corporation Limited,Chengdu 610072,China;Dowell Real Estate Development Corporation Limited,Shanghai 201100,China;Department of Civil and Environmental Engineering,Hong Kong University of Science and Technology,Hong Kong 999077,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,成都610072 [2]东原房地产开发集团有限公司,上海201100 [3]香港科技大学土木及环境工程学系,中国香港999077

出　　处：《中国科学：技术科学》2022年第12期1839-1848,共10页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2016YFC0401907)资助项目。

摘　　要：针对我国西部强震区水电工程建设中高土石坝抗震安全这一突出问题,提出了一种高土石坝复合加筋抗震措施,通过未加筋模型坝和复合加筋模型坝大型振动台对比试验,验证了复合加筋抗震措施的有效性和可靠性,并结合数值模拟探讨了复合加筋抗震措施的加固机制.研究结果表明:相比于未加筋模型坝,复合加筋抗震措施对坝顶加速度响应具有一定的抑制作用,能够有效抑制坝顶堆石松动和滑移,减小坝体地震永久变形.数值模拟分析进一步表明,坝顶复合加筋区域剪应变幅值和分布规律发生了明显的改变,较大的剪应变形成在坝内筋材前端,即潜在滑动面由未加筋的浅层滑动转变为深层滑动,因此,高土石坝复合加筋抗震措施提高了大坝的抗震安全性.研究成果可为强震区高土石坝的抗震设计提供借鉴.The aseismic safety of high earth rockfill dams is an important problem in engineering construction in the intensive earthquake area of West China.A composite reinforcement aseismic measure(CRAM)for high earth rockfill dams was developed.The CRAM’s effectiveness and reliability were validated using comparative model tests on a large-scale shaking table.Numerical simulation was used to examine the CRAM’s reinforcement mechanism.The results demonstrated that the CRAM had an inhibiting effect on the acceleration response;the CRAM can effectively inhibit the loosening and slipping of rockfill at the crest and reduce earthquakeinduced permanent deformation.The numerical simulation also revealed that the shear strain amplitude and distribution were significantly altered.A slightly larger shear strain appeared at the front of the CRAM’s internal reinforcement materials,and the dam slope’s potential sliding surface was transformed from shallow sliding to deep sliding.As a result,the CRAM can improve the high earth rockfill dam’s seismic safety.The research results can provide a reference for the seismic design of the high rockfill dam in the intensive earthquake area.

关 键 词：高土石坝 复合加筋 抗震措施 振动台模型试验 数值模拟 加固机制 

分 类 号：TV312[水利工程—水工结构工程] TV641.1