SU1625984A1 - Method of driving transport inclines in hard rock - Google Patents

Abstract

The invention relates to the mining industry and is intended for trenching by drilling and blasting in open pit mining. The method makes it possible to reduce the time of trenching due to the formation of a rock mass collapse corresponding to the slope of the trench along its length. The step along the length is divided into areas. The first row of wells from the ledge along the entire length of the trench, regardless of whether they belong to the site, are drilled and charged with loosening charge parameters. Subsequent rows of wells at each site are drilled and charged with charge parameters from enhanced to normal discharge, depending on the desired trench depth. Charging of charges is carried out in a sequence with a delay time between rows, increasing from the slope of the ledge deep into the array. The increment of the deceleration time for each row is equal to the deceleration time for loosening charges. After the explosion, the profile of the trench is planned by bulldozers 2 silt (L

Description

The invention relates to the mining industry and can be used in open pit mining.

The purpose of the invention is to reduce the time of trenching by obtaining the collapse of the rock mass corresponding to the profile of the trench along its length.

Fig. 1 shows the layout of wells on a ledge; Fig. 2 shows section A-A in Fig. 1.

The method is carried out as follows.

The length of the ledge is divided into sections 1. The length of the section is determined depending on the slope of trench I and the height of the ledge h according to the formula

Ly (0.1 O P1

Parameters of drilling and blasting operations at the sites are constant. Then, parameters of downhole charges 2 of the first row are calculated. Determine the line of least resistance at the bottom of the step using the formula

Wn - G, m, sin a q

where P is the capacity of 1 m well, kg:

q - calculated specific consumption of explosives, kg / m;

a is the angle of inclination of the wells to the horizontal plane, degrees.

The distance between the wells in the row (a) and between the rows is determined by the formulas

a - m Wn, b - (0.85-1.0) Wn, where m 0.8 1.4 is the coefficient of convergence

Determine the depth of perebor wells by the formula

ABOUT

go ate with

I, (10 15) r, where da - charge diameter

The mass of charge is determined by the formula

Q - q Wr, a h

The length of the charge (zar) and the length of the stemming (zab) is determined by the formulas

i - Q i -Ii

Nar - p - 1giv 1ztr

The calculation of the parameters of the emission charges (3) by Cestak in dut in the following sequence

Determine the length of the charge under the condition of the seismic on the 3 D gpubina

C p 0 75 h to and

The mass of charges is determined by the capacity of wells Q P lg

Unegna raskhots races vbbrosg on i-i + house / 4Jf, f (gchpedel t by the formula

He / O L 0 8 v h ,,

 (i trench depth t on t e

The charge from / to the affairs of the notes of the charge of charges nt ira and vmetimos and well. n ash to i tr i with gk gkvzhin

at

O j

R

ABOUT

n r ф jq „у in fl

 Rasp pnyl

TV bw sovzrymni works and compiling about t KTj on pgp "pdk trenches next day shouten with rigging (2 3) for the entire height of C vna with per prrrum P p r ry b bore holes (2) us

Regardless of the appropriateness of the site to the site and cabins with meters of charges ayge a i I notice. for that when the floor is dug 1T m °, the lowest rtzwap roption of the mass from .per then p yes r well and store it

tffeldfsdrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr such as quarters with 3 wells width T (i9Hii i each site is drilled and fahshei 4a charges each For each section, the Explosion of the arrays ocyu ectwl towards the noRepvuocin 5, in a random pattern, with a time interval between the rows of lengthening slope of the ledge deep into the array

Increasing the time of deceleration into the array allows for a free surface of dm of destruction and displacement of the rock fought off by the next row.

the series can be pulled apart the blasted rock mass across the width of the trench. The first and second series of slowing-down times to the honey will be equal to the slowing-down time for up to E1

loosening, for subsequent rows it increases

The deceleration time increment for each successive row is equal to the deceleration time for loosening charges if

between 1 and 2 in succession, the deceleration time of the loosening charge is 20 ms, then between / 2 and 3 in the distance of 40 ms, 3 and 4, in the range of 60 ms and ten days, to determine the deceleration time for each row is

t- (N-1) tP

where N if ifCTBO well wells pc

t, is the deceleration time for charge-ry cures ms

Pgkchs pzryyz fine-tuning the fabric rrnshech

up to the pumping level in the proposed way they are bullded or excavator without loading. The time spent on this operation is much less than the time of loading.

of the rock mass from the cross section of the trench and the track Pgpelno dramatically increases the speed of the pro boats TRN1 | her

Claims (1)

Invention Formula Entry trench entry method rocky rapids, including the drilling of boreholes on the sections of the entire height of the ledge for an explosive substance (10) short-delayed explosion ) WA in explosives charges and trench layouts, characterized in that with a target of 1; about | tseni trench penetration rate due to the breakdown of the rock mass corresponding to the trench along its length 0 not inferior but the first section of the ridge of the row of wells is divided into sections along the entire length of the trench and the subsequent rows of wells in each section of the drill are charged with the charge loosening charge parameters. 5 and charged with the parameters of charges of normal or enhanced ejection, and the charging of charges is carried out with deceleration time intervals between rows increasing from the slope into the array with and the deceleration time for each row of t is determined by the formula t - (N 1) tp ms where N is the number of rows of wells pcs t p deceleration time for snout charges 5 laziness ms Shig. one Schi 1