Numerical modelling of the response of cemented paste backfill under the blasting of an adjacent ore stope

Li, Genwei; Guang-zhe, Deng; Ma, Jingong

doi:10.1016/j.conbuildmat.2022.128051

Cited by 20 publications

(8 citation statements)

References 40 publications

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“…To study the stress state of natural and artificial masses, numerical modeling by the finite element method has become widespread in mining science [35][36][37][38]. By performing the modeling, the rock mass stresses are determined around underground mine workings, quarry flanks and slopes of rock dumps, as well as their stress state and stability are predicted.…”

Section: Methodology For Stress State Numerical Modeling Of Mine Work...mentioning

confidence: 99%

Influence of waste rock dump placement on the geomechanical state of underground mine workings

Petlovanyi

Sai

Malashkevych

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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This paper is devoted to assessing the influence of waste rock surface dumps on the geomechanical state of underground mine workings. The conditions of the Pivdenno-Bilozerskyi high-grade iron ore field are chosen as the research object. To study the influence of dump placement and the depth of mine working on the mass stress state on the contour of sublevel drifts, a numerical modeling methodology based on the SolidWorks software package has been developed. This methodology involves the substantiation of the elements and properties of the geomechanical model, as well as the calculation scheme. Polynomial patterns of changing stress value in the hanging wall drift sides have been determined in the depth intervals of 440–740 m depending on the distance of the dump to the geometric center of the stope chamber. It has been revealed that the degree of the waste rock dump influence on the stress state gradually decreases with depth. It has been found that the maximum degree of the waste rock dump influence is observed on the upper horizons. When the waste rock dump is located above the geometric center of the future stope chamber that the stress value on the contour of the hanging wall drift can increase up to 10% compared to the absence of a dump on the earth’s surface. The research results are important for designing stable parameters for supporting sublevel drifts in difficult conditions of occurrence of the hanging wall rocks.

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Section: Methodology For Stress State Numerical Modeling Of Mine Work...mentioning

confidence: 99%

Influence of waste rock dump placement on the geomechanical state of underground mine workings

Petlovanyi

Sai

Malashkevych

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…However, the unavoidable impact and vibration from blasting actions during backfill mining blasting operations negatively affect the stability of the backfill mass, altering its structural integrity. Using a uniaxial press, Li G [6] ascertained the mechanical characteristics of backfill materials with different cement-sand ratios. The ideal cement-sand ratio backfill was then entered into numerical models created by simulation software that mimicked real mine blasting and excavation.…”

Section: Introduction：mentioning

confidence: 99%

Investigation on Dynamical Mechanics of Rock-Backfill Composite Samples under SHPB Test

Ma,

Zhang,

Yang

2024

Preprint

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In blast-induced caving mining employing backfilling techniques, understanding the mechanism of interaction and evolution of deformation between rock and backfill under coupled conditions has become essential. In order to perform dynamic uniaxial impact testing at high strain rates utilizing the Split Hopkinson Pressure Bar (SHPB) test technique, this research produced coupled specimens of rock and cemented tailing backfill (CTB). The coupled body's stress-strain curves at various strain rates were measured, and the failure processes behind them were examined. Using GDEM software, a coupled model of SHPB rock-CTB was created in order to examine the internal variations in stress wave velocity as well as the evolution of cracks in the coupled specimens. According to experimental results, the dynamic compressive strength of the connected body increases first, falls later, and finally stabilizes when the average strain rate (ASR) increases from 27.45 s− 1 to 68.73 s− 1. At typical strain rates below 60 s− 1, the stress-strain curve displays a "stress drop" type, and at rates over 60 s− 1, a "stress rebound" type. When the ASR is below 55 s− 1, the energy absorption progressively increases; when it is above 55 s− 1, it reduces and then increases again. The simulation results validate the validity of the experimental conclusions by showing that transverse and longitudinal cracks occur on the surface of the backfill, with greater deformation observed on the side in contact with the transmission bar compared to the side in contact with the rock.

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“…Rock mass disturbances are peculiar in different fracture frequencies that form zones of intense fracturing, monolithic zones, and zones of stable fracturing [8,10]. Being in close contact with the artificial backfilled massif, and due to minor tensile stress in the latter, the fissured ore mass provokes the caving of the critical conglomerate mass with the further development of a caving chain of the backfilled area [11,12]. Such actions can be driven by a seismic effect from blasting operations [13], and the nonobservance of the parameters of borehole location on the contact with the artificial massif [14].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

et al. 2023

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Mining systems for ore deposit extraction with the backfilling of the goaf solve the problem of preserving the surface and the complete extraction of rich ores. This paper considers the filling of mined-out stopes with a viscous fluidal solution for the formation of an artificial strong massif, which results in a conglomerate formed on contact with the ore deposit. It was established that exogenous fracturing at the Pivdenno-Belozirske deposit significantly affects the stability of the sides and ceilings in the chamber. This phenomenon can be observed at the first stage of processing. At chambers (the second stage of processing), the artificial rock mass is exposed. It has been established that the chamber mining systems do not ensure the operational stability of the vertical outcrop in the zones of exogenous intensive fracture of the rock mass, especially in the places where they intersect. The zonal location of intense fracture was established along the strike and dip of the steep ore deposit, as was its importance in the formation of rock fallouts. An analytical solution algorithm has been developed to determine the penetration of the backfilling mixture in the plane of the intersection of zones of intense cracking, with opposite azimuths of incidence at steep angles of macrocracking. The features of penetration into microcracks of the backfilling mixture used at the mine, which are affected by their granulometric and physicochemical compositions, have been determined. The influence of the height of the layer and the procedure of backfilling the chamber space in the liquid phase on the formation of the necessary pressure for the opening of a microcrack was studied. The priority of backfilling the exogenous macrocracks with significant gaps and those between tectonic blocks with mixtures has been analytically substantiated and confirmed by experimental methods of research in the mine.

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Numerical modelling of the response of cemented paste backfill under the blasting of an adjacent ore stope

Cited by 20 publications

References 40 publications

Influence of waste rock dump placement on the geomechanical state of underground mine workings

Influence of waste rock dump placement on the geomechanical state of underground mine workings

Investigation on Dynamical Mechanics of Rock-Backfill Composite Samples under SHPB Test

Mechanism of Interaction of Backfill Mixtures with Natural Rock Fractures within the Zone of Their Intense Manifestation while Developing Steep Ore Deposits

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