This paper presents the experimental results of the filtration coefficient, samples density and porosity value changes on the basis of concreteferruginous quartzite beneficiation tailings against humidity in the range 1-30%. Specified dependencies are characterized by approximation reliability of 0,87-0,96 and can be used when choosing the ways of directed impact on hydraulic filling mass allowing to change its conditio

Donetsky, S. V.

Ermolovich, E. A.

DSpace at Belgorod State University

BHT 2016 Technische Universitat Bergakademie Freiberg11 Freiberg -  St. Petersburger Kolloquium junger WissenschaftlerRESEARCH ON PHYSICAL CHARACTERISTICS OF HYDRAULIC FILLING MASSDONETSKY S.V., ERMOLOVICH E.A.Belgorod State National Research University, RussiaA b s t r a c tThis paper presents the experimental results of the filtration coefficient, samples density and porosity value changes on the basis of concreteferruginous quartzite beneficiation tailings against humidity in the range 1-30%. Specified dependencies are characterized by approximation reliability of 0,87-0,96 and can be used when choosing the ways of directed impact on hydraulic filling mass allowing to change its condition.K e y w o r d sHydraulic filling, ferruginous quartzite beneficiation tailings, filtration coefficient, humidity, granulometric parameters, pressure gradient, flocculants, strengthening o f mass.1  I n t r o d u c t i o nThe hydraulic filling of developed chambers at the Gubkin mine (OJSC KombinatKMAruda) by the ferruginous quartzite beneficiation tailings solves many environmental problems related to its placement on the surface. However, this non-waste technology has the number o f significant drawbacks. Since the beneficiation tailings are supplied to the underground chamber without binding material, the use of hydraulic filling doesn’t allow mining of the pillars. Besides when mining the chambers placed under stowed excavated space by hydraulic filling, there is a danger o f exploration wells intersection by which hydraulic filling pulp starts to flow into underlying chamber that can lead to an emergency.It is necessary to change the condition of hydraulic filling mass cardinally in order to create environmentally compatible technologies. The choice of ways of directed impact on concrete block allowing to change its condition is caused by its physical characteristics, the most important o f which is water penetration.Water penetration is a capacity of materials to be passed through itself by water at some pressure drop.Water penetration depends on filtration rate equal to an amount o f water flowing through the unit o f cross-sectional area of filtering rock and is characterized by filtration coefficient, i.e. filtration rate at the pressure gradient equal one [1].Consolidation of hydraulic filling mass on the basis of ferruginous quartzite beneficiation tailings of OJSC KombinatKMAruda lasts for up to a year or more [2]. The humidity of concrete block and its physical characteristics are changing as a consequence.2  T h e  d e t e r m i n a t i o n  o f  f i l t r a t i o n  c o e f f i c i e n tThe aim of this study was to investigate the influence of humidity of hydraulic filling mass on the basis of concrete ferruginous quartzite beneficiation tailings on its filtration coefficient. The changes of density and porosity were controlled at the same time.199BHT 2016 Technische Universitat Bergakademie Freiberg11 Freiberg -  St. Petersburger Kolloquium junger WissenschaftlerThe determination of filtration coefficient was carried in compliance with GOST 25584-90 by means of KF-00M device with KF-1 tube (SPETSGEO tube).The tests were conducted at the different conditions of hydraulic filling mass samples -  from air- seasoned in limit loose condition to humid (up to 30%) in maximum pressed condition.The amount of added water to the samples to achieve the humidity needed shall be calculated in accordance with the following formula (GOST 22733-2002):( 1 )where Qadd is the mass of added water, g; Mg is the mass of selected sample, g; W is the humidity of the sample expressed as a decimal fraction; Wh = 0,01 is hygroscopic humidity of the sample expressed as a decimal fraction.Filtration coefficient Kf shall be calculated in accordance with the following formula:_ 364-Qf  F - T - l - t  , (2)where 864 is a conversion coefficient from cm/s to m/day; Q is the volume of filtered water, cm3; F is cross-sectional area of the tube that is 56,5 cm3; T is the time of filtration,s; I is the pressure gradient; t is the temperature correction in order to provide the values of water filtration coefficient at the temperature 10 ° C that shall be defined according to the formula:t  = (0,7 +  0,03 ■ t aj  (3)where ta represents actual water temperature during the test, С  The experimental findings are shown in the Table 1.According to the analysis of table’s data, the values of filtration coefficient increase almost 5,5 times due to changing of humidity of hydraulic filling mass from 30% to 1%.3  T h e  c h a n g e s  o f  d e n s i t y  a n d  p o r o s i t yThe density of the samples shall be calculated in accordance with the following formula:M - M op =  V , (4)where p is the density of the samples, g/cm3; M is the mass of filter tube, filled by the sample, g; М0 is the mass of empty filter tube, g; V is the volume of the filter tube, cm3Changing of sample density of hydraulic filling mass against the humidity is good approximated by third degree polynomial function with reliability R2=0,93:p  =  —0,0002117® +  0,0076117* +  0,0737117 +  1 ,9 1 7 7Figure 1 shows the dependence diagram.The porosity of the samples shall be calculated in accordance with the following formula:Ps ~PdП = ---------A  , (5)where n is the porosity of the sample,%; ps is the density of sample solids of hydraulic filling mass, that is 2,8 g/см3; pd is the density of matrix blend, g/cm3, that is determined in accordance with the following formula:200BHT 2016 Technische Universitat Bergakademie Freiberg11 Freiberg -  St. Petersburger Kolloquium junger Wissenschaftlerwhere p is the density of the sample, g/cm3; W is the humidity of the sample expressed as a decimal fraction.Tablel: Experimental findings of filtration coefficients determinationNo. Humidity,% Volume of filtered water,3cm3Time of filtration,sFiltration coefficient, m/dayof the sample averageW T Kf Kfav1 1(loose)10 9000 0,014 0,0125 3300 0,0195 15420 0,00415 16500 0,01140 32400 0,0152 1(pressed)10 3720 0,034 0,0185 2400 0,02610 13020 0,00910 7260 0,01710 8640 0,01415 16500 0,01120 7800 0,03315 16500 0,0115 8100 0,0073 5(pressed)30 30900 0,012 0,01030 31200 0,01225 30900 0,00925 33480 0,0094 10(pressed)30 30900 0,012 0,01230 31200 0,01230 30900 0,01235 33480 0,0145 15(pressed)15 33840 0,005 0,005712,5 32700 0,004915 32820 0,005915 32700 0,005917,5 33000 0,00866 20(pressed)20 33000 0,0078 0,007310 32820 0,003935 32700 0,013810 33000 0,00397 25(pressed)10 30000 0,0043 0,004512,5 31800 0,00511 31800 0,00448 30(pressed)7,5 31500 0,003 0,00222,5 30300 0,00110 31800 0,0042,5 31800 0,001201BHT 2016 Technische Universitat Bergakademie FreibergChanging of sample porosity of hydraulic fillingmassagainst the humidity is good approximated by third degree polynomial function with reliability R2=0,96:n = 0,QQ5llVa -  0,22351V1 + 1,91151V + 36,222 (7)Figure 2 shows the dependence diagram.11 Freiberg -  St. Petersburger Kolloquium junger WissenschaftlerFig.1: The dependence diagram of samples density of hydraulic filling mass against its humidityFig.2: The dependence diagram of samples porosity of hydraulic filling mass against its humidity4  C o n c l u s i o n sThe obtained dependencies allow to predict the physical properties of hydraulic filling mass and to develop the effective ways of directed impact allowing to change its condition in order to create environmentally compatible technologies of development.202BHT 2016 Technische Universitat Bergakademie FreibergR e f e r e n c e s[1] Kartoziya B.L., Fedunets B.I., Shuplik M.N., Malyshev Y.N., Smirnov V.I., Lerner V.G., Rakhmannikov Y.P., Korchak A.V., Filimonov B.A., Rezunenko V.I., Levitsky A.M. Mine and underground construction: Textbook -  2nd edition, updated and revised: in 2 volumes, Moscow, Izdatel'stvoakademiigornykhnauk, 2001. -Vol.1 -  607 p.[2] Leizerovich S. G., Pomelnikov I. N., Sidorchuk V. V., Tomayev V. K.Resource-producing wastelessgeotechnology of complex development of the field of the Kursk Magnetic Anomaly.- Moscow: Gornayakniga, 2012. -547 p.11 Freiberg -  St. Petersburger Kolloquium junger Wissenschaftler203

Research on physical characteristics of hydraulic filling mass

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Research on physical characteristics of hydraulic filling mass

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