Zhukov A.A.,Galurgia JSC |
Tarasov V.V.,Galurgia JSC |
Prigara A.M.,PPI Geofizika Ltd. |
Tsarev R.I.,PPI Geofizika Ltd.
Gornyi Zhurnal | Year: 2014
The article reveals disadvantageous features of current techniques used in mine shaft lining inspection. The best suitable methods for inspection of potash mine shaft lining and the lining-adjacent rock mass are highlighted. The lining condition is assessed using a package of complementary nondestructive test methods, including geo radio location, thermal imaging and acoustic surveys. Georadar sounding defines thickness of concrete lining and locates heterogeneities in the lining layer and the lining-adjacent rocks. Options of telephotography and acoustic sounding as applied to handling the set problems are considered. It is found that the most efficient is the following sequence of the nondestructive test methods: first, georadar and thermal imaging are implemented as the promptest and real-time methods, then, if necessary, the acoustic sounding is carried out to authenticate detected abnormalities. The integrated analytic survey has identified some zones with probable karst cavities in rock mass adjacent to concrete lining. In the identified areas, verification holes were drilled, which showed that concrete thickness changed in the range from 43 to 97 cm. Correlation of the concrete thickness values obtained from the drilling results and geophysical survey allows connection of the geophysical survey and drilling data. In whole, effect of the nondestructive test methods is considered positive and the mentioned package of the nondestructive test methods is introduced as a promising approach to elimination of visual control shortcomings and for real-time inspection of mine shafts.
Aptukov V.N.,Perm State University |
Konstantinova S.A.,GALURGIA JSC |
Mitin V.Y.,Perm State University |
Skachkov A.P.,Perm State University
Journal of Mining Science | Year: 2012
The paper discusses the indentation testing of sylvite grain using scanning probing microscope Dimension ICON and facility NanotTest-600. The authors present the approximated processing procedure for experimental curves and compare the obtained values of hardness and elastic modulus at different scale levels. © 2012 Pleiades Publishing, Ltd.
Soloviev V.A.,Galurgia JSC |
Aptukov V.N.,Galurgia JSC |
Gornyi Zhurnal | Year: 2015
It is a standard method to reinforce mine shafts in salt rocks using concrete lining or tubing support. From the experience of operating mine shafts, loads on the support grow with time under influence of rock pressure and rheological properties of salt rocks, and the support collapses. Rock pressure in salt rocks grows with the increase in mining depth, enlargement of mine shafts and exposure areas in rocks as well as at junctures of mine shafts and dosing chambers and inlet drivages. Miners know that one of the principles of stable mine support is that the support gives under rock pressure and deforms under critical load with no loss of the load-carrying capacity. This principle is particularly vital for mine workings driven in salt rocks that possess creep. The mentioned method is successfully used in tunneling. A pliable layer is made of cribbing, friction props or tubular members placed between rocks and rigid frame support. The authors suggest making pliable layer of compressible (nondestructive) material-foamed polystyrene-produced in the form of plates and widely used in civil underground construction. The article describes research findings on interaction between concrete lining, pliable layer and salt rock mass, the calculation method and flowchart for two-layer support with a pliable layer in mine shaft construction. The put forward method of mine shaft construction allows eliminating expensive cast iron liner. The method is now in operation at Upper Kama Potash Deposit, in projects of construction of mine shafts in Ust-Yaivinsky and Polovodovsky Mines, shaft no. 4 in Solikamsk Mine-3 and in construction of junctures of mine shafts and drivages at Usolsky Potash Mining-And-Processing Plant.
Solovyev V.A.,Galurgia JSC |
Aptukov V.N.,Galurgia JSC |
Konstantinova S.A.,Galurgia JSC |
Sekuntsov A.I.,Galurgia JSC
Gornyi Zhurnal | Year: 2013
Ground pressure in salt rocks shows by way of high-rate creep, which results in convergence of mine roadway cavity and higher load on mine support. Reinforcement of junctions of shafts and roadways as well as protection of mine shafts often uses monolithic concrete lining. After 15 or 20 years operation of shafts and junctions, the lining may fail, and many failureassociated problems may arise. Aiming to relate quantitatively displacements in walls, floors and roofs of mine roadways, as well as their main causes, monitoring of roadway cavities was carried out. Based on the monitoring data and using mathematical modeling, the influence exerted by various factors on the convergence of walls, floors and roofs in permanent roadways was evaluated. The authors discuss application efficiency of the known junction protection technique based on destressing hole drilling, as well as the new methods of making destressing slots, installing thrust baffles and placing pliant foam polystyrene between monolithic concrete lining and roadway wall rocks. The technology of preparing the pliant foam polystyrene layer during construction of mine junctions is described in the article.