毛细上升渗透系数的确定及在离子型稀土毛细上升中的应用  

Determination of the capillary permeability coefficient and its application to capillary rise on ionic rare earth

作　　者：金解放[1] 邱灿[1] 陶伟[1] 郭钟群[1] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000

出　　处：《有色金属科学与工程》2015年第4期104-110,共7页Nonferrous Metals Science and Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA061901);江西省自然科学基金资助项目(20151BAB206025);江西省教育厅科技项目(gjj14462);江西理工大学科研基金项目(nsfj2014-g04)

摘　　要：针对太沙基模型将毛细上升全过程假定为饱和渗透的缺陷,以离子型稀土原地浸矿开采为工程背景,对该模型中关键参数进行重新定义,用修正后的模型确定参数并拟合分析离子型稀土毛细上升试验结果.用毛细渗透系数代替太沙基模型中饱和渗透系数,前者与后者有不同的意义和大小.用土样最大粒径分别为0.3 mm、0.6 mm、1.18 mm和4.75 mm的离子型稀土进行毛细上升试验,用实测相应粒径稀土饱和渗透系数代入太沙基模型,同修正前后模型预测的数据与试验数据比较.结果表明,修正参数后的太沙基模型拟合数据与实际实测试验结果更吻合,其毛细渗透系数与实际一致.利用修正后模型拟合分析离子型稀土毛细上升试验结果.清水在离子型稀土中发生毛细上升时,随土体大颗粒晶体的增加,毛细渗透系数逐渐减小,最大毛细上升高度逐渐增加.对粒径级配相同的稀土土样,毛细渗透系数小于饱和渗透系数.毛细上升速率随时间呈现先快速下降、后缓慢减小的趋势.The Terzaghi model assumes that capillary rise permeability coefficient permeability coefficient, which brings about a great differences between the of soil is always saturated model results and actual measurements. In order to overcome the shortcomings, the key parameter of Terzaghi model was redefined with in-situ leaching of ionic rare earth mining as the engineering background, and the modified parameter was used to analyze the test results of capillary rise of ionic rare earth. The saturated permeability coefficient of Terzaghi model was replaced with the capillary permeability coefficient, and the latter had different values and meanings with the former. Four groups of capillary rise tests on ionic rare earth were carried out, their maximum grain sizes were 0.3ram, 0.6mm, 1.18mm and 4.75mm respectively, the feasibility of modified model was proved with fitting results of the experimental data. Putting measured saturated permeability coefficients of corresponding the estimated rare earth into Terzaghi model, the advancement of modified model was testified by comparing data of Terzaghi model and modified model with test data. The modified model was used to fit and analyze the test results of capillary rise experiment on ionic rare earth. Results show that the modified model is more consistent with reality than the original model, and the value of capillary permeability coefficient is closer to the actual value. Under water capillary rise in ionic rare earth, the values of capillary permeability coefficient decrease and the maximum height of capillary rise increase gradually with increasing the maximum particle size of soils. For the ionic rare earth of the same particle size, the value of capillary permeability coefficient is less than saturated permeability coefficient. Capillary rise velocity takes on a rapid decline at first, and then slowly decreasing trend over time.

关 键 词：离子型稀土 太沙基模型 毛细上升 模型修正 渗透系数 

分 类 号：TD865[矿业工程—金属矿开采] TU411.4[矿业工程—矿山开采]