SU1624150A1 - Method of excavating an overburden bench - Google Patents

Description

mykh layers. After the layer 2 collapses on the lower platform 6 of the ledge -1, the collapse width of the collapsed rocks 8 is equal to A (Fig. 1). The collapsed rocks 8 are excavated and transported to external or internal dumps by dragline or spade type excavators. After excavation of the collapsed rocks 8 on the lower platform b, the layer 9 of collapsed rocks is left uncleared (Fig. 2).

In this layer of 9 crushed rocks, it is possible to distinguish a pile of 10 bounded by the contours of the collapsed layer 2, whose width is equal to a, i.e. the width of the collapsed layer 2 (Fig, 2).

To collapse the subsequent layer 3 (Fig. 3), it is necessary to cut the production that is working on it 7. But the rocks that need to be removed when cutting the production 7 are basements of loose pile rocks 10 (Fig. 2). Therefore, rocks 11 of pile 10, located between the slope 12 of step 1 and plane 13, passing from the bottom edge of the step to the level of the surface of pile 10 at an angle & , ensuring the stability of its slope, is extracted, i.e. developed together with rocks of the ledge, transported to the dump and thereby earn extra work the layer 3 of the ledge 1 (figure 4). After the collapse of layer 3, rocks 11, which were removed from pile 10 during its underworking, are replaced by rocks of this layer 3 (Fig. 3). This means that the volumes of rocks 11 (Fig. 3) and belonging to pile 10 (Fig. 2) were worked out and transported to the dump simultaneously with the cutting of generation 7, and then the volume was filled with rocks of the newly collapsed layer 3. After excavation of the collapsed rocks 14 on the lower platform 6 of the ledge 1 along its slope 12, the bulk of the width of the collapsed layer 3 (fig.Z)

Then the rocks of this pile are removed (Fig. 6), located between the ledge slope and the plane 15 passing from the lower edge of the ledge 1 to the pile surface at an angle of 0 °, ensuring the stability of its slope.

If the angle O does not ensure the stability of the slope, then the remaining rocks 16 of the pile are shifted into working production 7 (Fig. 3), the parameters of this production are reduced and the collapse of layer 3 may not occur.

20 25

thirty

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50

five

When working out the subsequent layers 5 and 6, etc. the technological processes described are repeated.

The height of each pile is determined by the dependence

h -J- t ", v,

where A is the width of the collapse of rocks after the collapse of each layer, m;

a is the width of the layer to be broken, m; tj is the time spent on the sidework, collapse and excavation of the collapsed rocks of one layer, months .;

v is the speed of capillary raising of water in the collapsed rocks, m / month.

Claims (1)

Invention Formula A method of developing a stripping ledge, including refining its base, collapsing layers of rock to the lower platform of the ledge with the formation of bulk at the escarpment slope and subsequent mining of crushed rock, characterized in that, with the aim of developing 7 the site of the ledge by eliminating mixing of wetted rocks and rocks with natural moisture, the bulk of the crushed rocks is worked up with the formation of a layer on the lower platform of the ledge along its slope with a bottom width equal to Rine husked layer and the height h is determined from the expression h-- ± -tf, v, where A is the width of the collapse of rocks after the collapse of each layer, m; a is the width of the layer to be broken, m; t4 is the time spent on the sidework, collapse and excavation of the collapsed rocks of one layer, months .; v is the speed of capillary raising of water in the collapsed rocks, m / month. moreover, the bulk of the collapsed rocks along the escarpment slope is treated last, then, together with the underworking of the base of the escarpment, the rocks of the layer are removed, forming the slope of the layer at an angle of repose of the rocks forming it. Fm.1 / 9 Yu / y .. / g. h yKTvTTTTTv./.  "" ". ./l L / // /  g. h L / ////// I / /// P Фь.Ъ Fy.6 T Y 1