尾矿坝的液化判别研究

Study on Liquefaction Evaluation of Tailing Dam

概述尾矿坝液化试验判别的一般步骤,即根据《建筑抗震设计规范》中的初判条件对尾矿坝土层进行初判,在尾矿坝土层不满足初判的条件下,利用标准贯入试验对尾矿坝是否存在液化危害进行复判。影响尾矿料液化的因素很多,现有的液化判别方法过于繁琐,在综合考虑希德简化法和《构筑物抗震设计规范》提出的简化法的基础上,提出了一种主要考虑地震震级以及尾矿料的中值粒径、相对密度、静应力和尾矿料物理力学指标影响因素,并将其他影响因素综合为一个影响因素的简化判别法。以某个进行了标准贯入试验的尾矿坝为工程实例,采用简化判别法对该尾矿坝进行理论分析计算,并对试验和计算结果进行比较,得出理论分析结果与试验结果一致,表明该方法切实可行,可供类似工程参考。

General procedure for liquation experiment of tailing dams has been generalized, that is, preliminary identification has to be done for tailing dams according to Design Code for seismic building＇s identification conditions. When soil layers of tailing dams do not meet the requirements of preliminary identification conditions, second-identification has to be done to determine if liquefaction exists or not with the help of standard penetration experiment. Considering that there are too many factors influencing liquefaction of tailing mines and the current methods of liquefaction identification are too complicated, a simplified method, which mainly considers the factors of earthquake-resistance, medium grain particle size, relative density, static influence, physical and mechanical parametric of tailing material and the factor amalgamated by the other influencing factors, is presented on the basis of the combination of Chide simplified method and Design Code for seismic building. Taking a project on which standard penetration experiment has been done as an example, this simplified method is employed to theoretically analyze and calculate the tailing dam. Then, a comparison between the result obtained by experiment and the one obtained by calculation is made, it is concluded that the results are in accord with each other, which shows that the simplified method is applicable.