SU1735582A1 - Method for determination of exploded rock lumpiness - Google Patents

Abstract

Use: mining operations on rocks and ores, evaluation of the quality of drilling and blasting operations on the lumpiness of the exploded rock mass. SUMMARY OF THE INVENTION: The method involves taking a representative sample, mixing it, loading it into a container, and determining the yield of fractions. A representative sample in a container is repeatedly segregated by vibration. At the same time, to isolate fractions of successively decreasing size after each segregation, large pieces are taken, weighed and the yield of each fraction is determined with respect to the mass of the representative sample. 1 HI., 1 tab.

Description

The invention relates to the production of rock work on rocks and ores and is proposed for use in evaluating the quality of drilling and blasting operations on the lumpiness of the blasted rock mass.

There are known methods for determining the piecemeal using a measuring tape, photoplanometry, and a point one. These methods state the linear or areal distribution of fractions of the blasted rock mass, without taking into account the coefficient of loosening, compactness of the collapse, the fundamental difference between the volume distribution of the linear or areal.

The method consists in counting the number of pieces in three mutually perpendicular planes, determining the average number of pieces of a given fraction and calculating the yield of fractions of pieces according to the formula

1 | (1TGg-cr -100%,

where I: is the volumetric yield of the 1st fraction in the measuring container;

lirr is the average of three mutually perpendicular planes of the dimensional container

output of the 1st fraction determined by the planometric method;

kp is the coefficient of loosening of the rock mass in the measuring container.

The prototype has the following drawbacks: the difficulty of manufacturing a dimensional container with strong transparent walls and a large-scale mesh applied on them; the difficulty of accurately determining the coefficient of loosening of the rock mass in a measuring container.

The purpose of the invention is to improve the accuracy of determining the lumpiness of the blasted rock mass.

More accurate control of the lumpy rock mass lumpiness and an increase in the output of small fractions due to the rapid adjustment of the parameters of the blasting operations will improve the performance of the loading and transport equipment by 15-40%, reduce the wear of excavator buckets, dump truck bodies and dumpcars.

The essence of the invention is as follows. Representative sample in container

J

VI ate

00 | Yu

Do not repeatedly segregate by vibration. After each segregation process, round pins are picked.

and weighed. Then the segregation of the sample in the container by vibration is repeated, pieces of another smaller fraction are collected and weighed, etc.

The drawing is a diagram for implementing the method

The diagram shows a container 1 in the form of a box, a forge weight 2, a vibrating plate 3 and a scale 4.

The method is carried out as follows.

The container in the form of a metal box is loaded with an excavator by representative breakdown and taken to a special landfill (site), where the weighing takes place. After that, the container is installed on the vibroplatform of the CM-476B type and subjected to vibration with an amplitude of 0.3-0.75 mm. With a container capacity of 2 m, the duration of the first vibration cycle is approximately 6-10 minutes.

Next, the vibrator is turned off, a large fraction is taken from the container (the upper layer formed as a result of vibrosegregation) and weighed.

Thereafter, the cycle is repeated with the vibration of the remaining rock mass in the container, the selection and weighing of the next class size, and so on until the coin remains in the container, which is only weighed.

The lumpiness of the blasted rock mass is determined by the formula

100 J mi

five

ten

15 0 5

0

five

0

where yi is the output of the i-th fraction by size;

mi is the mass of lumps of the 1st fraction;

Q is the total mass of the sample in the container.

The table provides a numerical example for determining lumpiness.

After the measurements are completed, the mountain mass from the landfill is transported to the bottom, and the container is loaded with the next sample and the measurement cycle is repeated.

In large quarries, it is advisable to transport representative samples to the landfill by dump trucks, and to place the landfill with weights, vibrating platform, loader on a temporary site.

Claims (1)

Invention Formula The method of determining the lumpiness of the blasted rock mass, including the selection of a representative sample, mixing, loading it into the container and determining the yield of fractions, characterized in that, in order to improve the accuracy of determination by taking into account all the pieces of a given size, the representative sample in the container is repeatedly segregated by vibratory 1. In order to isolate fractions of successively decreasing large g, g after each segregation, large pieces are taken and weighed, and the output of each fraction is determined by cases are of the formula 100 mi --ir2- where mi is the mass of a piece of the 1st fraction, kg; Q - sample mass in the container, kg. / g about. oh oh oh oh oh oh ABOUT: , Oh gg, o ° ° about. Ltd  about. about Ltd about about o 2 . , Oh gg,