Home – Home – Jornals – Advanced Search

The results of investigation into the effect of static and dynamic stresses on support when sinking the ring drift in the Safyanovsky underground mine are presented. A measurement technique is developed that allows recording the velocity of rock mass displacement at several points using three-component GS-20DX geophones connected to the recording computer by means of seismic streamers. An assessment of the support type of a ring drift is made for compliance with the effective loads, taking into account the influence of blast seismic effect during sinking the drift.

The results of studying gas purification from nitrogen and sulfur oxides by natural zeolites are presented, the corresponding dependences are obtained. It is shown that the most effective sorbent for gas purification is the iron-containing modified zeolite of the Shivyrtuisky deposit. The sorption capacity of natural zeolites is determined, the modification parameters are found.

The publications concerning the development of the Bakcharsky deposit of oolitic iron ores in the Tomsk region are analyzed. It is noted that under relatively simple mining and geological conditions, the deposit has an increased degree of water encroachment, which is one of the decisive factors when selecting a method for its development. According to the preliminary estimates, the deposit is considered as a large promising raw material base for the West Siberian metallurgical complex. It is shown that any possible mining method can be used for ore production, including open-pit, underground methods and their combinations, borehole hydraulic mining that provide an environmental safety.

The structure of a geological section used for drilling degassing wells in coal deposits is given. The advantages of the impact-rotational drilling method are shown. The procedure of core sampling using down-the-hole pneumatic hammer is presented. Annular pneumatic hammer with a central sludge transport is described. Down-the-hole pneumatic hammer of a solid face with an adapter redistributing the movement of drilling mud from the annular space to the central pipe of a double drilling string is considered.

The relevance of using pneumatic impact machines in conditions of confined technological space is justified. Examples of pipe driving into soil by means of small-sized pneumatic impact machines are presented. Vibratory percussive penetration of vertical pipes with different diameter was physically simulated, the results are presented. The effectiveness of using an experimental model of pneumatic impact machine with two controllable chambers for driving pipes in soil is proved.

A procedure for calculating the parameters of a reverse action hydraulic hammer (with an elastic constraint between the striker and the frame) is proposed, which can be used at the stage of its preliminary design. The method is based on the assumption of a constant pressure in the system and linear nature of the constraint between the striker and the frame. This allows obtaining formulas for calculating the dynamics and characteristics of the system using the equations of oscillation theory. Since the problem is iterative in the case of interaction between the striker and outside environment with a non-zero recovery coefficient, recursion is used in the algorithm for calculating the output characteristics of limit cycles. A program is developed and test calculations are performed. The results are compared with similar results obtained using a software for calculating the parameters of hydraulic impact devices based on a system model with a constant flow source. Satisfactory convergence of these results is noted.

Analysis of the existing methods for calculating the coefficients of proportional-integral controller of axial fan performance system in a shallow subway was carried out. The technique of calculating the controller coefficients in the Mathlab (Simulink) environment is presented.

The design features of vibratory transporting devices with elastic actuators, mainly feeders, developed at the Chinakal Institute of Mining SB RAS are described. In order to increase the distance of transportation and the possibility of using such machines in various technologies for processing minerals, it is proposed to use an additional vibration source in their drive. The dynamics of an elastic actuator was investigated during the operation of two vibration exciters in a synchronous mode and a beat mode by physical modeling. The conditions of stability are found and the scope of application of both modes is determined.

The results of studying the nonuniformity effect of air flow velocity field entering the axial fan on aerodynamic parameters of main mine fans of the shafts for different configurations of input elements are presented. A parameter for estimating air velocity nonuniformity at the fan input is introduced. It is shown that dependence of total pressure and total efficiency of the fan system is linear.

As a result of a computational experiment, the parameters of transient air distribution from the piston effect of trains and the structure of air stream at the places of filter installation are determined depending on their locations in a ventilation connection. The dependences of change in air consumption at the station on the coefficient of closing section of ventilation connection are obtained.