基于三维地质模型的排土场边坡整体稳定性探究  

Researches on general stability for dump slope based on three-dimensional geologic model

作　　者：李跃[1,2] 杨永生[1,2] 毛权生[1,2] 唐恺[1] 

机构地区：[1]中钢集团马鞍山矿山研究院 岩土工程研究所,安徽马鞍山243000 [2]金属矿山安全与健康国家重点实验室,安徽马鞍山243000

出　　处：《岩土力学》2013年第S1期533-539,共7页Rock and Soil Mechanics

摘　　要：目前所广泛采用的平面应变分析手段,针对排土场边坡稳定性评价时有时会出现某剖面安全系数高于设定允许值,实际中却遭破坏的现象,除了常被提及的力学参数、本构模型等因素,排土场凹形夹持效应和凸形发散作用突出以及滑体端部效应的影响,是分析结果不能准确反映实际的根本原因之一。鉴于此,从平面高程数据、地质剖面、钻孔资料等条件,配合插值效果较为稳定的Kriging法对空间数据进行插值,建立排土场三维地质整体模型。然后,采用自编FISH语言接口程序,将地质模型导入FLAC3D中离散化并计算,较为简单、有效地实现三维地质建模、模型可视化、岩土工程计算分析三位一体功能,有效地克服了平面分析无法解决的上述问题。以攀钢兰尖铁矿尖山第7排土场为实,对其整体稳定性进行应力、应变分析,采用三维强度折减法计算排土场三维整体安全系数,与现场调查及平面计算结果较为一致。基于该模型的计算结果可以有效避免排土场空间效应和滑体端部效应,得到的排土场全域应力-应变规律,对露天矿排土场的生产管理,具有一定的指导意义。The plane strain analysis method was widely adopted in evaluation of dump slope stability.It is embarrassed that,dumps sometimes destroyed but the safety factor was go over the allowable value.Regardless of those issues had been mentioned frequently,such as mechanical parameters,constitutive model and so on,the spatial clamp effect of convex and divergent effect of concave and slide-body-end effect are also play vital roles in analysis of slope stability.For those reasons,proceed from conditions of plane elevation data,geological section,drilling data and others,Kriging interpolation method,which can obtained a smooth effect of interpolation,was adopted,and then the three-dimensional(3D) geological model of dump was built.Then an interface program,wrote by FISH,was used to import the 3D-model into FLAC3Dto discretization and calculation.In this way,the issues mentioned above can be figure out efficiently.Trinity function include 3D geological modeling,model visualization,geotechnical analysis was achieved in a simple and highly efficient way.An example of Jianshan seventh dump of Lanjian Iron Mine,Pangang Group co.Ltd.of China,was concerned by previous mean,3D stress-strain analysis was carried out,3D global safety factor was also calculated by 3D strength reduction method.It turned out that the results was accordant to the field investigation and plane strain analysis conclusion.Results calculated by the 3D geological model cannot be affected by dump spatial effect and slide-body-end effect,the general stress-strain pattern,which obtained from the method,can be instructive and meaningful to production management for open-mine dumps.

关 键 词：排土场 三维建模 稳定性 安全系数 KRIGING插值 露天矿 

分 类 号：TU43[建筑科学—岩土工程]