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Zhang L.-T.,Shijiazhuang University | Zhang L.-T.,Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education
Shuili Xuebao/Journal of Hydraulic Engineering | Year: 2013

The instability characteristics of tailing dam and the routing characteristics of debris flow induced by dam instability are important research directions of the dam-break of tailing pond, which is summarized in this paper. First the instability causes, mechanism and instability model of tailing dam are reviewed, and it is shown that the available results mainly focus on the dam instability model caused by the static stability against sliding and the seismic liquefaction of the tailing pond, but less on the asymptotic failure model caused by the seepage deformation and the dam overtopping. Meanwhile, the instability characteristics of the tailing dam due to the flow-slip deformations induced by seismic liquefaction need further study. Second, a survey of the debris flow characteristics after dam instability is also attempted, including the physical properties, rheological model and flow routing model, and it is found that there are some hypothesis in the existing debris flow routing model for the tailing pond, such as the dam failure processes, the size and shape of dam breach, the region of the tailing-break, which can cause some error to the analysis result of the debris flow routing. In summary, the analysis model for the dam-break of tailing pond is not perfect, which needs further study by the subject cross of the soil mechanics, hydraulics and the sediment dynamics. Source


Shi Y.,Shijiazhuang University | Shi Y.,Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education | Wang J.-W.,Shijiazhuang University | Wang J.-W.,Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

During Wenchuan earthquake, some lateral shear keys of bridges suffered severe damage partially caused by poundings between shear keys and girders. Based on pounding phenomena between shear keys and girders under strong ground motions, a pounding model of a single column considering eccentric distances between shear keys and girders, nonlinear behaviors of bearings and elasto-plastic behaviors of piers was established. With the time history analysis method for nonlinear seismic responses of structues, the effects of many parameters, such as, eccentric distance, pounding stiffness, initial gap between shear key and girder, linear stiffness of pier, mass ratio of uppertructure and bent cap, period ratio of upperstructure and lowerstructure, and elasto-plastic behaviors of piers on the lateral seismic responses of a bridge were analyzed. The results indicated that the poundings considering eccentric distances between shear keys and girders can enhance the non-linearity of the system, ignoring eccentric poundings in an analysis for a lower height girder (e<70cm) can cause nonconservative results, they should be paid to more attention. Source


Li Y.-X.,Shijiazhuang University | Li Y.-X.,Key Laboratory of Roads and Railway Engineering Safety Control of Ministry of Education | Yang Q.-S.,Beijing Jiaotong University | Tian Y.-J.,Beijing Jiaotong University | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

The analysis formulas of wind-induced background response and resonant response considering modal coupling effects and the coupling effect between background response and resonant response for large-span roofs were derived based on the random vibration theory. Furthermore, the theoretical combination formulas of total fluctuating wind-induced response considering modal coupling effects were proposed. On the basis of this, the coupling effect modification coefficient was introduced, and the proposed combination formulas were simplified according to the dynamic characteristics of the roofs and the features of fluctuating wind loads, the corresponding practical combination formulas were obtained to realize the combination of the background response, the resonant response, and their coupling of the large-span roofs efficiently. At last, the effectiveness of the proposed method was verified using the combination computing of fluctuating wind-induced background response and resonant response of the National Stadium main roof structure. Source

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