Description of conditions and the technology implementing the method
Description of the control and experimental plots and the method of control of their condition
Improving the competitiveness of coal as a primary energy source in Ukraine, due to a decrease of its cost, which make up most of the cost of mining-preparatory work. One way to reduce these costs is the use of systems development with reuse developments. An important issue is to protect the excavation workings in the zone of influence of sewage treatment works. To date, developed a number of ways and means of excavation, but universal, applicable to any geological conditions do not exist. It is therefore necessary to develop new or improve existing means of protection, subject to the conditions in which they apply. Department staff. RRKK IGG DonNTU led by my supervisor was developed to protect the generation,
which includes the installation of security installations along the mine workings, while guarding installations performed in the form of a cuboid with a ratio of length to width of the base box is not less than 2:1, and the length of the foundation box perpendicular to the longitudinal axis of the output, and between the protective structures to create.5 + 2.0 Width of the base box, and the depth of identical length of the base of the box.
Laboratory tests were positive unsolved problems of the region.
At the time of execution of my master's work done enough analysis and laboratory studies the manifestations of rock pressure in the application of this method, however, poorly understood issue is the effectiveness of this method of mining conditions. Despite the complexity and organizational complexity of the field tests, only these methods allow you to accurately and uniquely determine the effectiveness of the proposed activities.
In this regard, the purpose of my master's thesis is to conduct acceptance testing method of making rigid structures with compensatory cavities.
Purpose and scope of the project: Way of making rigid structures with cavities compensation relates to the mining industry and can be used to protect the reservoir excavations at beztselikovoy working out of coal seams.
Writing conditions and the technology implementing the method of making rigid structures with compensatory cavities : Description of conditions and the technology implementing the method of making rigid structures with compensatory cavities: Validation of the developed method were carried out with the protection of the western fifth conveyor drift (Fig. 1) m3 reservoir of mine "Scheglovskaya-Glubokaya", which were followed by lava rocks with podryvkoy roof and the soil layer, fastened metalloarochnoy AP-5/18 lining, 3 of the SVP-33 with the holders of 1.4 m and a spacing of 4 x 0 , 5m +1 x 0,8 m section Ssv. = 20.9 m2, Spr. = 28.6 m2, with reinforced concrete bowstring roof bowstring sides of a metal grid. Removable reservoir thickness 1.37 - 1.52 m, the angle of incidence from 7 to 12 °, the strength of coal in uniaxial compression - 15 MPa, bulk density - 1.32 t/m3. Layer located above the false roof and provided with broken shale interbedded veins or texture of coal, ranging from 0.1 to 0.5 m.The immediate roof was represented by shale ranging from 3.5 to 4.0 m. The stability of the species are classified as B3, in areas of bearing pressure - B2. The main roof was represented by the upper part of the layer of shale, sandy shale and sandstone, with a total capacity of 28.0 m to 42.0 m. Shale with uniaxial compression strength of 40 MPa at the top of the layer passed in flint capacity 3.7 m with a strength in uniaxial compression of 75 to 95 MPa. Breeds on the main roof obrushaemosti classified as A2.
Direct soil was represented by sandy shale capacity of 0.80 m, with strength in uniaxial compression of 20 to 30 MPa. The main soil - sandy shale, with the strength to uniaxial compression of 61 to 75 MPa. The soil is classified as P2 - P3.
Changes in technology relating to the protection of conveyor drift (Fig. 2 animation) The protection of production carried out as follows: the top side of the conveyor roadway supported kosovichnik width 3.5 m in the direction of dip. On the underside of the kosovich for legs metalloarochnoy lining the roadway is arranged an escape route from the lava in the light of at least 1.5 m 2 (according to BP), which every 2,2 - 4,0 m from the face roadway laid semiblocks the entire height of developed space with intervals of 1.5 m (ielength 1.5 m, void, following 1.5 m - laying rock on with laying strips of semiblocks)
Above the emergency exit down the strip laid out on the entire height of the mined-out space, 2.0 m wide at the clay-brick dressings to the scheme in masonry walls, the size of semiblocks 0,3 x 0,15 x 0,09 each. The upper portion of the band width of 0.5 m were laid vsploshnuyu its entire length, while the lower part were laid width of 1.0 m to the abandonment of the cavities is length 1.5 m - the emptiness, the next 1.5 m - is laid out lane on clay.
The control station is equipped with five stations by step outline of the installation of 10 m to 50 m long section (35PK - 40PK).
The experimental site was equipped with five gauging stations in the west of the fifth period of drift set in increments of 10 m to 50 m long section (42 + 5m PC - 47PK 5 m). Metering station layout is shown in Figure 3.
Observations of rock pressure were way, the proposed staff DonNTU, and tested in the third Oriental conveyor drift m3 reservoir of mine "Scheglovskaya-Glubokaya" (Minutes of 30.12.2010 y). According to this method, metering station, shown in Figure 4, consists of a frame and metering points in a controlled frame. A frame is a piece of metal rod of rebar diameter 0.032 m and a length of 0.5 m.
а)
б)
As the metering points during the acceptance tests were selected characteristic points (center of verhnyak, locks, center of the soil, becoming the pipeline, etc.), Elevation and relative displacements of the reference frame determined by laying the leveling of the control point located outside of the displacements (surveying point at the mouth of production) and in intermediate frames of reference with respect - with the water level.
Thus, information was obtained about the spatial displacement metering points at any given time, and after comparing these values with previously measured at baseline were obtained by the absolute value of the displacement of rocks, the degree of growth which can be seen on the marginal increase in the voltage of the array, and this.
1. The process of displacement of the roof and the soil is characterized by two periods - heavy and steady. The first period lasts 25-30 days and is characterized by significant manifestations of rock pressure. The total convergence in the development of the control plot over a period of intense pressure of rock is more than 40% of the total.
2. Displacement of rock soil production at both sites are more active during the period of intense displacement and decay at a distance of 70-100 m after you pass the lava, the displacement of the roof going on in the area of steady rock pressure, and their ultimate value reaches 60-65% of the total convergence in the development of
3. In the control plot during the observation period the average values of the displacement of rocks soil of 0.8 m, the pilot - 0, 55 m. Thus, the displacement of rocks soil generation, using the method of making rigid structures with compensatory cavities were 31% less than in an area where development was guarded by a shaft technology. At the same time and the total convergence generation decreased by 31%.
4. Acceptance testing method of making rigid structures with compensatory cavity in the fifth western pipelined drift is over and gave a positive result.
During the writing of this abstract master's degree work is not yet complete. Final completion: December of 2011. Complete text of work and materials on the topic can be got for an author or his leader after the named date.
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