Cyclic-flowline technique for construction of embankment dams

Moiseev, I. S.; Agapov, D. S.; Tret'yakov, G. N.

doi:10.1007/bf02380409

Cited by 2 publications

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“…A characteristic feature of belt conveyor transportation at the present time is the capability of transporting material up to 500 mm [8]. Conveyors for transporting larger material is in the experimental production stage, and, for the near future, industrial production of conveyors for transporting material up to 700-1000 mm in size can be e~pected.…”

Section: I000mentioning

confidence: 99%

Modern conveyor transportation and prospects for its use in hydraulic construction

Moiseev¹,

Agapov²

1976

Hydrotechnical Construction

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Hydraulic construction experience gained during the last few years bears witness to the development of construction of embankment dams, whose cost can be substantially reduced through suitable organization of the construction work and me of modern progressive equipment, especially for transporting materials. A summarized description of the earth-rock work volumes for some embankment dams is presented in Table i [9].The volumes of earth--rock work at five of themost representative quarries of nonmetallic materials of the Ministry of Power and Electrification (Mindnergo) of the USSR amounts to 1.5-2.5 million mS/yr at each enterprise. The haul distance for earth--rock materials from the quarries to the embankment dams is usually in the 3-5-km range, and the haul distance for the rock to the concentrating plants processing it is of the order of 2-a km. Up to the present time, earth and rock for construction of embankment dams. as well as nonmetallic materials from quarries, have been transported by dump trucks, up to 27 tons in carrying capacity, at a haulage cost of 12-15 kopecks/ton-kin. This makes it necessary to construct and maintain costly roads with rigid pavements, especially for large-capacity machines, as well as to construct and maintain maintenance-mechanical shops, filling stations, fuellubricant storehouses, and other service enterprises. Truck transportation calls for a large number of workers, especially drivers, and. consequently, for increased construction of residential buildings and enterprises for these personnel.In the construction of embankment dams, thc cost of hauling earth--rock materials may amount to up to 60% of their total cost. This situation occurs to the same extent in the quarrying of nonmetallic materials. In the last few years, in Soviet and foreign practice, to transport rock from quarries to concentrating--grading plants, as well as stripped soil to dumps, along with truck transport use has been made of conveyors. The operating e~cperience of several mining enterprises in the ferrous and nonferrous metallurgical industries, construction materials enterprises, and coal industzy enterprises indicates that conveyor transport exhibits various substantial technicoeconomic advantages in comparison with truck transport [1][2][3] 7]: The demand for workers is reduced (on account of the decrease in the number of operating persons); the number of trucks is lowered; the transportation cost is reduced by a factor of 1.5-2; the labor productivity of the persormel is considerably increased; progressive flow-line techniques are introduced in earth--rock work in the quarry--dam line in the construction of embankment dams, and in the line from the quarry to the crushing--grading plant in the exploitation of nonmetallic materials; the coefficient of utilization of the main mining equipment is increased through reduction of the dead time of the equipment in the flow-line method; and possibilities are opened up for reducing the transportation distance of the mined mass to the ground surface on acco...

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Section: I000mentioning

confidence: 99%

Modern conveyor transportation and prospects for its use in hydraulic construction

Moiseev¹,

Agapov²

1976

Hydrotechnical Construction

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Drilling and blasting operations in the cyclic-flow technology of earth-dam construction

Moiseev¹,

Agapov²

1975

Hydrotechnical Construction

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The cyclic-flow technology in the construction of high earth dams is the most effective, providing an increase in the rate of construction, reduction of construction time, and decrease of labor consumption. One of the labor-consuming processes in earth-dam construction is the transport of materials from borrow pits to the dam. With the existing cyclic technology it is accomplished mainly by dump trucks. In the cyclic-flow technology of earthworks the material is transported from the borrow pit or quarry by continuous mechanisms, particularly conveyors. This type of transport in comparison with vehicular is less labor-consuming and cheaper [I]. However, on the existing belt conveyors it is possible to transport material with a panicle size to 400 mm [2], and in the case of a flexible suspension of the conveyor rollers up to 600 ram. The quarry rock obtained by blasting has a size to 1600 mm and more [3].Conveyors that can transport ran-of-pit rock larger than 600 mm are presently being developed. Presently, large rock before delivery to the conveyor belt is crushed to transportable pieces. In this connection, loosening of the rock in the quarry by drilling and blasting is arranged so that the rock has a minimum quantity of oversize pieces larger than 400 ram. The existing traditional drilling and blasting technology in quarries does not always meet these requirements. Blasting is usually done in vertical boreholes on a selected face.The physical and mechanical properties of rocks, their tensile strength, block character of the rock mass and especially fracturing are not taken into account completely in a number of cases when calculating the parameters of drilling and blasting operations. The classification of rock masses [4] according to the degree of fracturing and content of large pieces is given in Table 1.

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Cyclic-flowline technique for construction of embankment dams

Cited by 2 publications

References 1 publication

Modern conveyor transportation and prospects for its use in hydraulic construction

Modern conveyor transportation and prospects for its use in hydraulic construction

Drilling and blasting operations in the cyclic-flow technology of earth-dam construction

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