摘要
西克尔水库在“1.19”震后坝体产生纵向裂缝,通过地质灾害特征、有限元等多种方法对坝体裂缝成因进行综合分析,裂缝成因是由坝基浅表砂层液化产生的轻微液化沉降和地震横波振动产生的拉应力而产生剪切破坏共同形成的。设计采用下游坝坡脚设置排水和盖重的方式防地震液化,并采用坝顶1.8m范围内(1/5坝高)上下游侧现浇钢筋砼板+土工格栅加筋分层填筑的方式,使坝体振动幅度最大区域形成整体以抵抗剪切破坏。结果表明,通过以上工程措施可以大幅提高坝体的抗震能力,可为类似工程设计提供参考。
After the“1.19”earthquake,the dam body of Siker reservoir produced longitudinal cracks.The causes of cracks in the dam body were comprehensively analyzed by using geological hazard characteristics,finite element and other methods.The causes of cracks were formed by the slight liquefaction settlement caused by the liquefaction of the shallow sand layer of the dam foundation and the shear failure caused by the tensile stress caused by seismic shear wave vibration.In the design,drainage and cover weight are set at the downstream dam toe to prevent earthquake liquefaction.The method of cast-in-situ reinforced concrete slab+geogrid reinforcement at the upstream and downstream sides within 1.8m of the dam crest(1/5 dam height)is adopted to form an integral area with the largest vibration amplitude of the dam body to resist shear failure.Through the above engineering measures,the seismic capacity of the dam can be greatly improved,which can provide an important reference for similar engineering design.
作者
陆云才
LU Yun-cai(Xinjiang Investigation and Design Research Institute for Water Resources and Hydropower,Urumqi 830000,China)
出处
《水利科技与经济》
2023年第3期27-34,共8页
Water Conservancy Science and Technology and Economy
基金
新疆水专项(2020.C-004)。
关键词
均质土坝
地震裂缝成因
抗震结构设计
西克尔水库
homogeneous earth dam
causes of seismic cracks
seismic structural design
Siker reservoir
