Grout diffusion characteristics during chemical grouting in a deep water-bearing sand layer  

作　　者：Ali Akbar Daya 

机构地区：[1]Department of Mining Engineering,University of Sistan and Bluchestan,Zahedan 98164-161,lran

出　　处：《International Journal of Mining Science and Technology》2012年第4期573-577,共5页矿业科学技术学报（英文版）

基　　金：the National Natural Science Foundation of China (Nos. 40772192 and 40372123);the Key Laboratory Project of Deep Rock Mechanics (No.PD1011)

摘　　要：This paper is devoted to application of ordinary kriging method in Choghart north anomaly iron ore deposit in Yazd province, Iran. In order to estimate the deposit, 2329 input data gained from 26 boreholes were used. Fe grade was selected as the major regional variable on which the present research has focused. All of the available data were changed to 12.5 m composites so that statistical regularization could be reached. Studies indicated that iron grade input data had single-population characteristics. To carry out ordinary kriging, a spherical model was fitted over empirical variogram. Then the model was verified through cross validation method and proved to be valid with a coherence coefficient of 0.773 between the estimated and real data. Plotting the empirical variogram in different directions showed no geometric anisotropy for the deposit. To estimate the Iron grade, ordinary kriging method was used according to which, all of the exploitable blocks with dimensions 20 m x 20 m x 12.5 m were block esti- mated within the estimation space. Finally tonnage-grade curve has been drawn and reserve classified into measured, indicated and inferred.The deep,loose bottom aquifer of the eastern air shaft in the Xinglongzhuang Coal Mine was used to develop an experimental model of shaft grouting through Model deep soil.Lab experiments using chemical grouting were done to study the grout.The grouted soil shapes and osmotic pressure were measured during the experiments.The tested characteristics of the grouted soil show that the diffusion mode of grout in saturated sandy soil is a combination of split compaction and osmosis.More specifically,the shape of the grouted soil is determined by split compaction while the size of the grouted soil shape is determined by osmosis.Sensor test results indicate that the main reason for the non-uniform grout diffusion is the anisotropic osmotic pressure field surrounding the grouting holes.

关 键 词：Choghart north anomalyOrdinary krigingGeostatisticsOre reserve estimation 

分 类 号：TD861.1[矿业工程—金属矿开采] P618.410.9[矿业工程—矿山开采]