降雨入渗条件下粗粒排土场稳定性分析  

Stability Analysis of Coarse Grain of Dumping Under the Condition of Rainfall

作　　者：李超[1] 马淑芝[1] 贾洪彪[1] 李天慈[1] 

机构地区：[1]中国地质大学工程学院,湖北武汉430074

出　　处：《金属矿山》2015年第9期147-151,共5页Metal Mine

基　　金：国家自然科学基金项目(编号:50908217)

摘　　要：基于饱和-非饱和渗流有限元分析,研究山西某矿区粗粒排土场在降雨条件下的入渗机理与特点。在对不同期矿渣排土体采样筛分的基础上,通过粒径分布曲线推导非饱和渗透系数,结合工程实例,运用Geostudio建立一定降雨强度条件下的边坡岩土体渗流场有限元分析模型,定量分析降雨过程对粗粒排土场稳定性的影响。结果表明:粗粒排土场因其粒径及结构上的特殊性,致使基质吸力随饱和度的变化趋势并不显著。前期排土体具有更好的压实作用,导致降雨入渗在排土体体内主要以渗透系数较大的第三期矿渣排土体为主,同时,排土体中通畅的渗流通道容易引起局部水力梯度值迅速攀升,又因为其排水过程较快,使排土场安全系数的滞后性并不明显,在雨后短时间内有所回升。Based on saturated-unsaturated seepage finite element theory,the infihration mechanism and characteristics of coarse grain of dumping under the condition of rainfall analysis in a mining area in Shanxi were investigated. On basis on the sieving test of slags in different dumping period, the unsaturated permeability coefficient was derived through particle size dis- tribution curve. Combined with an engineering example, and with use of the numerical simulation software Geostudio, the finite element model of slope seepage was established, and quantitative analysis on the effect of rainfall stage on for coarse mine sta- bility was made. Results showed that the particularity size and structure of the coarse grain mine results that the change trend of matric suction along with saturation is not significant. While, the previous dump has a better compactness, and the rainfall seep- age mainly comes to the third period of dumping with a greater hydraulic conductivity. At the same time, the unobstructed seep- age channel in dump can easily cause a local rapid rise in hydraulic gradient, and also because of its fast drainage process, the stability coefficient of coarse mine has a not obvious lagging. But in a short time after the rain,it will have a certain amount of rebound.

关 键 词：排土场 降雨入渗 非饱和理论 边坡稳定 

分 类 号：TD12[矿业工程—矿山地质测量]