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On the type to approach the top rate of filling the access method

Filling the law then how high the top rate to achieve? Of more than trying to approach the level of style to the practice of filling method is based. Discussed theoretically, and the majority of my colleagues open to question. 21, then sulfur width, arch height, and air from the relationship between sulfur into the road section is assumed 4m × 4m, high arch were taken 0,50,0.75,1.00,1.25,1.50,1 .75 m and 2m, 2m arch high arch which is half-arch, and the remaining three are all heart arch; air were taken from the top of 0.1,0.2,0.30.4 m and 0.5m. The figure shows the different high arch arc-shaped arch, which can be calculated from a certain air of different Juan's take a hard high arch width and arch must compete with various empty hard top from the width of the access time to calculate the top pick rates, the results are shown in Table 1 (calculations omitted). We can see from the table,[link widoczny dla zalogowanych], when the air from the roof is fixed, then top with the high arch width increases; when the arch height is constant, then from the top width of the roof with the air decreases. Calculation Results 1 capsule is connected Huan Ping Table1Resultsofcalculation top of things. '4 Then the top rate of mining and metallurgy 2 range from the foregoing, the level of approach for the ceremony to filling method, was flat in the state of the roof into the road,[link widoczny dla zalogowanych], due to the inevitable shrinkage Shen filling, filling the top pick is not in theory possible. But in fact the roof is not easy to keep smooth, filling may be irregular bulge in the roof area contact with the roof, which can be called if the top pick, then take the top rate is very low. Only when the roof was vaulted into the road, the filling was easy with the spandrel at the roof contact, then forming part of the roof. Then the top rate with the increase of high arch, with the empty top distance increases. Table 1 shows that in the calculations: When the arch of higher or less than the space at the top of distance, such as arch are all high and 0.5m from the air when the top, then the top rate to zero; when the arch high maximum (2m) and empty the top from the smallest (0lm), the then top rate of 69% maximum. As a result of the filling method to approach the mine type, and its ore is generally not very stable, for safety,[link widoczny dla zalogowanych], into the road section size is not too large. According to the level of the approach in the style to fill a survey conducted during the test method and the relevant literature, approach the width and height is generally 3 ~ 5m, from the top of the actual space is generally 0.1 ~ 0.5m, the actual Arch height is not more than 0.5 to 2. Om. The minimum distance in the empty top (0.1m) under the conditions. Respectively approach the minimum basal area (3m × 3m) and the maximum basal area (5m × 5m) were calculated the maximum rate then the top 64% and 72%. Therefore, in the style to approach filling method using the slurry pipeline transportation of gravity gravity conditions, the cross section approaches the normal range, air and arch height from the top, then fill the top rate in the range of 0 to 72%, if the progress Road width and height of not more than 5m, then the maximum value can reach the top rate should be 72%. This is the type to approach filling method can reach the top rate then provides a theoretical basis for the range. Of that: on the last fill method to approach in terms of style, using 70% or less in the tradition of filling the concentration of cement filling mode, filling the access road into the top of slaughter can achieve 7. % To 72% is quite high, in order to take the top rate of filling more than 72%, theoretically, it is almost impossible. Of course, if the change in filling way down with no dehydration of the paste, such as pump pressure or high-water rapid hardening filling materials and filling, then top rate of increase is possible. 3 Conclusion then is on the top level approach to the law-type filling one of the main security technical measures. Factors that influence access the top of the sink filling material shrinkage, gravity gradient and into the road section, which filling material is the deciding factor reduction Shen. Transported by gravity in the gravity pipe cement slurry under the conditions of filling, filling and easy to isolate the process and the need for slurry dehydration, which makes filling the sink reduction is inevitable, filling into the road surface and the inevitable gap between the roof. Under these conditions, if the approach was flat state of the roof, filling the top pick is unlikely; when the roof is arched, the easy access in the arch at the top of the shoulder, so approach with the top arch section is to increase the rate of access necessary conditions. Theoretical calculations show that the top rate then increases with a high arch and the roof space increases with decreasing distance. The approach used in the mining section of the arch appears high and normal air from the top of the range, the maximum filling then top rate of 72%. References 1 \Mining Manual (Volume 4). Beijing: Metallurgical Industry Press, Tong Du. 19,[link widoczny dla zalogowanych],902 in the Run position. Slurry concentration on the impact of sand cemented filling. Non-ferrous metals (quarterly), 1984,[link widoczny dla zalogowanych],36 (21:6 ~ ll3 were like the sea. Detonating blasting pipe cutting test show. Mining and Metallurgy, 1996,5 (4): 12 ~ 1 chu (Received when you hear: 1998 - 66-15) jl
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