Seismic responses of high concrete face rockfill dams:A case study  

作　　者：Sheng-shui Chen Zhong-zhi Fu Kuang-ming Wei Hua-qiang Han 

机构地区：[1]Geotechnical Engineering Department,Nanjing Hydraulic Research Institute [2]Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam,Ministry of Water Resources

出　　处：《Water Science and Engineering》2016年第3期195-204,共10页水科学与水工程（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grants No.91215301 and 51309161);the Scientific Research Fund of the Nanjing Hydraulic Research Institute(Grants No.Y314011 and Y315005)

摘　　要：Seismic responses of the Zipingpu concrete face rockfill dam were analyzed using the finite element method. The dynamic behavior of rockfill materials was modeled with a viscoelastic model and an empirical permanent strain model. The relevant parameters were obtained either by back analysis using the field observations or by reference to parameters of similar rockfill materials. The acceleration responses of the dam,the distribution of earthquake-induced settlement, and the gap propagation under the concrete slabs caused by the settlement of the dam were analyzed and compared with site investigations or relevant studies. The mechanism of failure of horizontal construction joints was also analyzed based on numerical results and site observations. Numerical results show that the input accelerations were considerably amplified near the top of the dam, and the strong shaking resulted in considerable settlement of the rockfill materials, with a maximum value exceeding 90 cm at the crest.As a result of the settlement of rockfill materials, the third-stage concrete slabs were separated from the cushion layer. The rotation of the cantilever slabs about the contacting regions, under the combined action of gravity and seismic inertial forces, led to the failure of the construction joints and tensile cracks appeared above the construction joints. The effectiveness and limitations of the so-called equivalent linear method are also discussed.Seismic responses of the Zipingpu concrete face rockfill dam were analyzed using the finite element method. The dynamic behavior of rockfill materials was modeled with a viscoelastic model and an empirical permanent strain model. The relevant parameters were obtained either by back analysis using the field observations or by reference to parameters of similar rockfill materials. The acceleration responses of the dam, the distribution of earthquake-induced settlement, and the gap propagation under the concrete slabs caused by the settlement of the dam were analyzed and compared with site investigations or relevant studies. The mechanism of failure of horizontal construction joints was also analyzed based on numerical results and site observations. Numerical results show that the input accelerations were considerably amplified near the top of the dam, and the strong shaking resulted in considerable settlement of the rockfill materials, with a maximum value exceeding 90 cm at the crest. As a result of the settlement of rockfill materials, the third-stage concrete slabs were separated from the cushion layer. The rotation of the cantilever slabs about the contacting regions, under the combined action of gravity and seismic inertial forces, led to the failure of the construction joints and tensile cracks appeared above the construction joints. The effectiveness and limitations of the so-called equivalent linear method are also discussed.

关 键 词：Concrete face ROCKFILL DAM (CFRD) SEISMIC response Zipingpu PERMANENT strain Construction joint VISCOELASTIC model Finite element method 

分 类 号：TV312[水利工程—水工结构工程] TV641.43