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为研究地震作用下一般尾矿库的动力特性及破坏规律,探寻坝体加固方法,开展尾矿库概化模型振动台试验。由振动台提供水平动力,利用加速度传感器、激光位移传感器、动态数据采集系统及高速相机等设备获取坝顶加速度、位移及变形数据,分析尾矿库溃坝原因,提出坝体加固方案。试验结果表明,受地震荷载作用的尾矿坝,在坝体坡面2/3处出现“抛掷”现象;加速度放大系数随坝体高程变化不明显,随峰值加速度增加而递减;当峰值加速度达到0.4 g时,尾矿库经历液化、滑移、开裂,最终导致溃坝;溃坝后的泥浆沿下游不断演进直至停滞,堆积形态呈三角形;在坝底打抗滑桩加固能提高坝体的稳定性。
In order to study the dynamic characteristics and failure regularity of general tailing dam under earthquake action, the method of strengthening the dam body is explored and the shaking table test of the generalized model of tailings reservoir is carried out. The horizontal motive force is provided by the vibrating table. The acceleration, displacement and deformation data of the crest are obtained by accelerometer, laser displacement sensor, dynamic data acquisition system and high-speed camera. The reasons for the dam breakage are analyzed. The dam reinforcement plan is proposed. The test results show that the tailings dam affected by seismic load has a “throwing” phenomenon at 2/3 of the slope of the dam; the acceleration amplification factor does not change obviously with the elevation of the dam and decreases with the acceleration of the peak; when the peak value When the acceleration reaches 0.4 g, the tailing pond undergoes liquefaction, slippage and cracking and finally leads to dam break. After the dam break, the mud continuously evolves along the downstream until it stagnates, and the accumulation pattern is triangular; Body stability.