后龙河水库土坝坝料动力特性试验研究

Experimental Study on Dynamic Behaviors of Material for Earth Dam of Houlonghe Reservoir

后龙河水库坝基为砾质粗砂层，上、下游砂壳为人工堆填的砾质粗砂，结构松散，多数不满足抗震要求。为进行大坝动力安全性分析和液化评判．采用振动三轴仪对坝基和上游砂壳砂层的动力特性进行了试验，分析了其动强度、动力变形、动孔压特性，结果表明：砾质粗砂的振动应力比值随振次的增加而减小，随固结比的增大而增大；弹性模量随应变值的增大而减小，阻尼比随应变的增大而增本.

The earth dam of Houlonghe reservoir are built with gravelly coarse sand bed as dam base, and artificially filled in gravelly coarse sand as upstream and downstream sanded shell with loose structure, which cannot meet the needs of earthquake-resistance. For dam dynamic safety analysis and liquefaction judgment, the experiments of dynamic behaviors are carried out to analyze the dynamic strength, dynamic deformation and dynamic pore pressure behaviors of the dam base and upstream sanded shell. The result has shown that the vibration stress ratio of gravelly coarse sand decreases with the increase of vibration frequency and also increases with the increase of consolidation ratio. The elastic modulus of gravelly coarse sand decreases with the increase of strain, and that the damping ratio of gravelly coarse sand increases with the increase of strain.