A Prognosis Methodology for Underground Infrastructure Damage in Sublevel Cave Mining

Svartsjaern, Mikael

doi:10.1007/s00603-018-1464-7

Cited by 14 publications

(4 citation statements)

References 21 publications

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“…In sublevel caving, the hangingwall gradually caves into the excavated volume as the production continuous (see e.g. Svartsjaern 2018;Svartsjaern et al 2016). This rather complex caving processes are known to progress over weeks (or up to years for crown pillars), and depend on size, location, geometry and geology of the hangingwall (Malmgren, private communication, 2017).…”

Section: Discussionmentioning

confidence: 99%

Modelling the Dynamic Relationship Between Mining Induced Seismic Activity and Production Rates, Depth and Size: A Mine-Wide Hierarchical Model

Martinsson

Törnman

2019

Pure Appl. Geophys.

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The dynamic properties of mining induced seismic activity with respect to production rate, depth and size are studied in seven orebodies in the same underground iron ore mine. The objective is to understand the relationship between the measured seismic activity and the: seismic decay time, planned production rate, production size and mining depth. This relationship is the first step to individually customise the production rate for each orebody in the mine, make short-term predictions of future seismicity given planned productions, and to find out in what way the available predictors affect the seismicity. The seismic response with respect to the dependent variables is parametrised and the estimated decay times for each orebody, which are of particular interest here, are compared. An autoregressive model is proposed to capture the dynamic relationship between the induced seismic activity, the current production rate and the past seismic activity. Bayesian estimation of the parameters is considered and parameter constraints are incorporated in the prior distributions. The models for all orebodies are tied together and modelled hierarchically to capture the underlying joint structure of the problem, where the mine-wide parameters are learnt together with the individual orebody parameters from the observed data. Comparisons between the parameters from the hierarchical model and independent models are given. Group-level regressions reveal dependencies on size and mining depth. Model validation with posterior predictive checking using several discrepancy measures could not detect any model deficiencies or flaws. Posterior predictive intervals are evaluated and inference of model parameters are presented.

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Section: Discussionmentioning

confidence: 99%

Modelling the Dynamic Relationship Between Mining Induced Seismic Activity and Production Rates, Depth and Size: A Mine-Wide Hierarchical Model

Martinsson

Törnman

2019

Pure Appl. Geophys.

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“…In an SLC metal mine, the evaluation, prediction, and control of convergence deformation of haulage drifts is intimately connected to the safety and efficiency of the production, which continues for the whole lifespan of the mine. In general, as the footwall is more stable than the hanging wall (Svartsjaern, 2018), haulage drifts are more inclined to be arranged in footwalls (Svartsjaern, 2018). However, in the case of two or more parallel ore bodies with short distances, similar to the Jinshandian Iron Mine, haulage drifts arranged as hanging walls can also be an alternative.…”

Section: Introductionmentioning

confidence: 99%

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Yang

Chen²,

Sun³

et al. 2023

Front. Earth Sci.

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In this paper, mining-induced deformation for haulage drifts of the hanging wall at Jinshandian Iron Mine is investigated, based on 8 monitoring stations adopted laser convergence meters. Monitoring results are analyzed to divide deformation-time curves into three types: fluctuation type, partial folding type and whole folding type. Moreover, it is found that tensile deformation is easy to occur in the roadway section corresponding to no folding type and partial folding type. And in the roadway section with folding type curve, it is obviously affected by the steeply anti-inclined structural plane. Furthermore, the relative position relationship between mining activities and a monitoring station is established through local coordinate system. Mining effects on roadway deformation are studied based on rectangular coordinate components and polar coordinate components respectively. The critical value of coordinate components that have a significant impact on roadway deformation have been determined. At last, combined with results of mining impact analysis, deformation mechanisms corresponding to the three deformation curves are revealed. These results help determine the appropriate support time and adopt targeted support schemes.

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“…Apparently, the caved rock and backfill in the pit can provide support to the footwall and hanging wall and thus reduce the subsidence effect (in terms of magnitude and extension) [ 1 ]. Time–displacement, time–inverse velocity, and time–velocity curves have also been used to study the different stages of the ground surface deformation encountered [ 2 – 6 ].…”

Section: Introductionmentioning

confidence: 99%

Ground Movement in the Hanging Wall of Underground Iron Mines with Steeply Dipping Discontinuities: A Case Study

et al. 2023

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To ensure the safety of underground mining activities and effectively protect the surface production facilities and houses of the nearby residents, the ground movement caused by the sublevel caving method needs to be studied. In this work, the failure behaviors of the surface and drift of the surrounding rock were investigated based on the results of in situ failure investigations, monitoring data, and engineering geological conditions. The results were then combined with theoretical analysis to reveal the mechanism responsible for the movement of the hanging wall. Driven by the in situ horizontal ground stress, horizontal displacement plays an imperative role in both the movement of the ground surface and underground drifts. Accelerated movement is found to occur in the ground surface which coincides with the occurrence of drift failure. Failure occurs in the deep rock masses and then gradually propagates to the surface. The steeply dipping discontinuities are the main reason for the unique ground movement mechanism in the hanging wall. As steeply dipping joints cut through the rock mass, the rock surrounding the hanging wall can be modeled as cantilever beams subjected to in situ horizontal ground stress and lateral stress due to caved rock. This model can be used to obtain a modified formula for toppling failure. Also, a mechanism of fault slipping was proposed, and the condition required for fault slipping was obtained. Based on the failure mechanism of steeply dipping discontinuities, the ground movement mechanism was proposed considering the horizontal in situ ground stress and caved rock mass: slippage of fault F3, slippage of fault F4, and toppling of rock columns. Based on the unique ground movement mechanism, the goaf surrounding rock mass could be divided into six zones: a caved zone, a failure zone, a toppling-slipping zone, a toppling-deformation zone, a fault-slipping zone, and a movement-deformation zone.

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A Prognosis Methodology for Underground Infrastructure Damage in Sublevel Cave Mining

Cited by 14 publications

References 21 publications

Modelling the Dynamic Relationship Between Mining Induced Seismic Activity and Production Rates, Depth and Size: A Mine-Wide Hierarchical Model

Modelling the Dynamic Relationship Between Mining Induced Seismic Activity and Production Rates, Depth and Size: A Mine-Wide Hierarchical Model

Mining-induced deformation for a haulage drift of the hanging wall at Jinshandian iron mine in China

Ground Movement in the Hanging Wall of Underground Iron Mines with Steeply Dipping Discontinuities: A Case Study

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