Computer simulation of open pit bench blasting in jointed rock mass

1998 ◽  
Vol 35 (4-5) ◽  
pp. 476 ◽  
Author(s):  
Z. Jia ◽  
G. Chen ◽  
S. Huang
Keyword(s):  
Computer Simulation ◽  
Rock Mass ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Open Pit ◽  
Bench Blasting

Stochastic Three-Dimensional Joint Geometry Model and the Properties of REV for a Jointed Rock Mass

2014 ◽  
Vol 1079-1080 ◽  
pp. 266-271
Author(s):  
Wen Hui Tan ◽  
Zhong Hua Sun ◽  
Ning Li ◽  
Xiao Hong Jiang
Keyword(s):  
Rock Mass ◽  
Probability Distributions ◽  
Three Dimensional ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Open Pit ◽  
Mechanical Parameters ◽  
Geometry Model ◽  
Joint Geometry ◽  
3D Network

The lithology of rock mass isnon-homogeneity，anisotropy, andexists size effect. The mechanical parameters of rock mass gotten by engineeringapproaches cannot reflect these properties. Therefore, a newmethod of determining the mechanical parameters of jointed rock mass isproposed: gneiss in Shuichang open-pit mine was selected as a case, thefracture system of the rock mass was measured and analyzed by non-contactmeasuring system of 3GSM and probabilisticmethod,the probability distributions of geometry parameters were analyzed and a 3Djoint geometry model was made by using the program of 3D network modeling.Cubes with different sizes were selected to be tested by tri-axial compressionof numerical simulation with 3DEC based on the 3D network model of joints,thus, the REV and its mechanical parameters were determined, which providedcredible parameters for slope stability analysis.

scholarly journals Initiation of residual stress zone during blasting in jointed granite rock mass in operation of Priargunsky Industrial Mining and Chemical Union

2020 ◽  
pp. 60-64
Author(s):  
V. N. Tyupin ◽  
Keyword(s):  
Rock Mass ◽  
Experimental Studies ◽  
Confining Pressure ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Open Pit ◽  
Initiation Mechanism ◽  
Technical Literature ◽  
Short Delay ◽  
Granite Rock

Russian and foreign technical literature says that blasting in jointed rock mass induces zones with altered physical properties and geomechanical behavior beyond the perimeter holes. These zones are identified as the crushed zone, radially fractured zone, spalling zone and shattered zone. The shattered zone lacks scientific attention although this zone can reach the width of (30–170)db (db—blasthole diameter) in open pit mines and (25–75)db in underground mines. The earlier implemented research answers the question on quantitative change in the stresses and strains of a jointed rock mass during blasting. The initiation mechanism of the shattered zone remains unclear. This study aims to find the initiation mechanism of the shattered zone in jointed rock mass and to determine its stress state after blasting. Three series of full-scale experimental studies have been performed in jointed granite rock mass using acoustic emission methods, ultrasonic techniques and deformation measurements. It is found that in the shattered zone, blocks in the jointed rock mass displace radially from the blast holes with deformation of the joint surfaces and with elastic strains preserved after blasting. For this reason, this zone is qualified as the zone of blast-induced residual stresses. The article gives the formula for the residual radial compressive stresses under short-delay multi-row blasting. The numerical calculation using this formula and the actual mine data prove the formula validity. The method of destressing blasting is proposed to unload rockburst-hazardous rock mass from stresses in the areas of the confining pressure phenomena such as spalling and sloughing. This method has been trialed in Priargunsky’s mines in granite rock mass (1400 m long area was unloaded from stresses in mines). The authors highly appreciate participation of I. I. Shishkin, B. M. Belyaev, V. M. Pankov and V. A. Pazdnikova in the experimental research.

Geomechanical behavior of jointed rock mass in the large-scale blast impact zone

2020 ◽  
pp. 11-14
Author(s):  
V. N. Tyupin ◽  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Measurement Data ◽  
Ground Surface ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Open Pit ◽  
Velocity Versus ◽  
Research Findings ◽  
Seismic Impact

The review of literature sources has allowed determining the mechanism of seismic blasts waves in jointed rock mass. The author presents the theoretical formulas for calculating stresses, relative strains and displacement velocities induced in rock mass by large-scale blasts. The formulas take into account the detonation characteristics of explosives, the borehole diameter, the length of explosive charges, the number of simultaneously blasted charges per groups and the factor of explosion energy redistribution to rock throw. Moreover, the formulas include the properties of rocks between the blasting point and a guarded object, and on the exposed surface of a guarded object. The compressive stresses, relative strains and displacement velocities in rocks are calculated from the formulas. The theoretically found change in the displacement velocity versus distance agrees with the field measurement data obtained in an open pit mine of Polyus company. The formulas of stresses and relative strains were used to define seismic impact exerted by large-scale blasts on the barrier of dry dock No. 1. Based on the calculated results, the recommendations are developed on reduction of seismic impact of blasts during dredging in the dock. The research findings are applicable to developing blasting regulations toward reduction in seismic impact of large-scale explosions on exposed surfaces in rock mass, as well as on the ground surface structures and buildings.

Computerized design of blasting parameters based on drillability index of jointed rock mass in roller bit drilling in open pit mines

2021 ◽  
pp. 75-79
Author(s):  
V. N. Tyupin ◽  
I. M. Ignatenko ◽  
I. B. Agarkov ◽  
I. S. Kryuchkov
Keyword(s):  
Rock Mass ◽  
Jointed Rock ◽  
Jointed Rock Mass ◽  
Open Pit ◽  
Open Pit Mines

Analysis of TBM Tunnel Behavior in Jointed Rock Mass

2011 ◽  
Vol 90-93 ◽  
pp. 2033-2036 ◽  
Author(s):  
Jin Shan Sun ◽  
Hong Jun Guo ◽  
Wen Bo Lu ◽  
Qing Hui Jiang
Keyword(s):  
Rock Mass ◽  
Numerical Models ◽  
Jointed Rock ◽  
In Situ Stress ◽  
Jointed Rock Mass ◽  
Joint Orientation ◽  
Joint Spacing ◽  
Factors Affecting ◽  
Dip Angle

The factors affecting the TBM tunnel behavior in jointed rock mass is investigated. In the numerical models the concrete segment lining of TBM tunnel is concerned, which is simulated as a tube neglecting the segment joint. And the TBM tunnel construction process is simulate considering the excavation and installing of the segment linings. Some cases are analyzed with different joint orientation, joint spacing, joint strength and tunnel depth. The results show that the shape and areas of loosing zones of the tunnel are influenced by the parameters of joint sets and in-situ stress significantly, such as dip angle, spacing, strength, and the in-situ stress statement. And the stress and deformation of the tunnel lining are influenced by the parameters of joint sets and in-situ stress, too.

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