基于三维建模的尾矿库潜在液化区计算  

Calculation of Potential Liquefaction Zone of Tailings Pond Based on Three-dimension Modeling

作　　者：余易豪 YU Yihao(China Building Materials Industry Geologic Exploration Center Liaoning Branch.)

机构地区：[1]中国建筑材料工业地质勘查中心辽宁总队

出　　处：《现代矿业》2024年第7期113-118,共6页Modern Mining

摘　　要：为得到尾矿库运营期间尾砂材料的地震液化稳定性,以地形图为依据,通过建立尾矿库三维模型框架,创建三维点云分布,从而生成尾矿库现状及原状地形的空间曲面,根据钻孔数据确定地质界面分层。采用总应力法计算尾矿库在地震荷载作用下的三维动力响应,从而基于剪应力比对比法确定尾矿库内尾砂的潜在液化区域。以某尾矿库为例,建立三维数值计算模型,得到了在ParkField波作用下的动力响应和尾矿库各点的峰值动剪应力及尾砂的液化分布情况。计算结果表明,该框架可以有效地完成尾矿库三维数值计算模型的建立,并在给定地震波作用下,基于剪应力比对比法实现三维液化区域计算,得到案例尾矿库的液化区域主要分布在尾矿库内,子坝底部水位线以下无液化区。In order to obtain the seismic liquefaction stability of tailings during the operation of tail⁃ings reservoir,this paper establishes a three-dimensional modeling framework for tailings reservoir.This framework creates a three-dimensional point cloud distribution based on topographic maps to generate spa⁃tial surfaces of the current situation and undisturbed terrain of tailings reservoir.The geological interface lay⁃ering is determined based on drilling data.The total stress method is used to calculate the three-dimensional dynamic response of the tailings reservoir under seismic loads,and the potential liquefaction area of tailings inside the tailings pond is determined based on the shear stress ratio comparison method.Taking a tailings reservoir as an example,a three-dimensional numerical calculation model is established to obtain the dy⁃namic response under the action of Park Field waves,the peak dynamic shear stress distribution at various points of the tailings reservoir,and the liquefaction distribution of tailings.The calculation results show that the framework can effectively establish a three-dimensional numerical calculation model for the tailings pond,and achieve three-dimensional liquefaction area calculation based on the shear stress ratio compari⁃son method under the given seismic wave action.The liquefaction area of the case tailings reservoir is mainly distributed inside the tailings pond,and there is no liquefaction area below the water level line at the bottom of the sub dam.

关 键 词：尾矿库 三维建模 动力响应 液化 总应力法 

分 类 号：TD926.4[矿业工程—选矿]