SU1490276A1 - Method of determining strained state of rock body - Google Patents

Abstract

This invention relates to mining, and b. used in underground mining. The purpose of the invention is to improve the accuracy of determining the stress state of an array by taking into account the effect of fracture, anisotropy and real deformation characteristics on it. In the same type of rocks, the cleaning chambers are tested, and in the process of their mining, deformations of the massif are determined. The camera is worked out until one of the vertical outcrops (VO) or horizontal outcrops (GO) reaches the limiting conditions of dimensional stability. By the finite dimensions of the VO and GO, the equivalent limit spans of the VO and GO are determined depending on the size of the GO along the strike, VO along the normal to the fall and the fall of the deposit. Then, the ratio of the limit values of the equivalent spans of VO and GO and the ratio of the values of equivalent spans of the stable VO and the limit values of the equivalent spans of the GO are calculated. By the minimum value of these ratios, the lateral thrust coefficient and the stress state of the array are established, according to which the technology of clearing excavation is selected.

Description

FIELD OF THE INVENTION The invention relates to mining and can be used in underground mining.

The purpose of the invention is to improve the accuracy of determining the stress state of an array by taking into account the effects of fracture, anisotropy and the actual deformation characteristics of the array.

The way {) is realizable

in a way.

In the same type of rocks, cleaning chambers are being tested. In the process

testing the chambers by any hardware methods or visually measuring the deformations of the j opHoro array. Each camera is worked out until at least one of the vertical or horizontal exposures reaches the limiting of the conditions of dimensional stability, i.e. until the measured deformations reach their limiting values. Further development of the treatment chambers is terminated. By the finite size of the outcrops, their equivalent spans are determined.

Mg.a JM + a

Mr Mrfb

/ MJ, + b2

a M. b where M j. - the size of the horizontal outcropping across the direction of the deposit, m;

horizontal outcropping along the strike of the deposit, m;

the size of the vertical outcrop normal to the fall of the deposit, m;

the size of the vertical outcrop by the dip of the deposit, m. For the outcrops that have reached their limits of dimensional stability conditions, the calculated spans are the limit. If the outcrops have not reached their limit of size stability conditions, then the outcrops and their spans are considered to be stable.

Then, the ratios of the limiting spans of vertical and horizontal outcrops are calculated.

at

Shve

and the ratio of the values of equivalent spans of stable vertical exposures and the limit values of equivalent spans of horizontal outcrops

1i

me

The minimum value of the ratio of the marginal equivalent spans of vertical and horizontal exposures is 1. „„ „is defined as the arithmetic average between the lowest value and the maximum value i ,.

By the minimum ratio of maximum spans of vertical and horizontal exposures, the lateral spread factors are determined:

outside the zone of sewage treatment

-Y -; -

t

1mmn

in the affected area

O

five

0

five

0

five

0

five

0

l - (P) ° 1 - 1 (th F

 In L min

Based on the obtained values, A, stresses are determined by known dependencies, which link the lateral throttle factor to stresses, in addition, these lateral thrust coefficients are used to determine the technology of the clearing recess.

Claims (1)

Invention Formula The method of determining the stress state of the mountain massif, including measuring the deformations of the mountain massif during the mining treatment chambers, determining the sizes of vertical and horizontal outcrops and estimating the out-of-place and in the zone of influence of the cleaning works, the stability of these outcrops, characterized in due to the influence of fracturing, anisotropy and the actual deformation characteristics of the massif on it, measurement of rock mass deformations is performed during mining chambers in the same type of rocks and when one of the vertical or horizontal exposures reaches their limiting conditions of sustainability of the dimensions of the chambers are stopped, then the limit values of equivalent spans of the horizontal and vertical exposures are determined by the specified outcrop sizes, the ratio between the maximum values of the vertical spans and horizontal outcrops | and the ratio between the equivalent spans of stable vertical outcrops and the limiting values of the equivalent spans of horizontal outcrops r |, the stress state of the mountain massif outside and in the zone of influence of the cleaning works is determined by the minimum ratio of the marginal equivalent spans of vertical and horizontal outcrops, which defined as the arithmetic mean between n and h.