Predicting changes in induced seismicity on the basis of estimated rock mass energy states

Bańka, P.; Chmiela, Andrzej; Fernández, M. Fernández; Fernández-Muñiz, Zulima; Sánchez, Antonio Bernardo

doi:10.1016/j.ijrmms.2017.03.010

Cited by 16 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is gradually realized that the complex strength change and overall failure behavior of rock could be nicely described from the energy point of view. In recent years, the principle of energy dissipation and release has been widely considered in the field of rock mechanics and engineering and this principle has been applied to the identification of rock instability (Griffith 1921;BAńKa et al 2017), brittleness evaluation (Zhang et al 2017;Chen et al 2020), and rockburst prediction (Kidybinski 1981;Cai et al 2001;Yang et al 2019). However, most of the previous studies focused on isotropic rocks.…”

Section: Introductionmentioning

confidence: 99%

Effect of loading direction on the critical characteristic strength and energy evolution of quartz mica schist and microscale mechanisms

Yin

Zhang

Lei

et al. 2021

Bull Eng Geol Environ

View full text Add to dashboard Cite

In this study, micro and uniaxial compression tests were performed on two types of quartz mica schist. The effect of schistosity orientation on their mechanical properties was discussed in terms of the critical characteristic strength (CCS) and energy. Furthermore, the microscale mechanism of the mechanical properties of schistose rocks was revealed. In view of the good correspondence between the energy evolution curves and stages of rock damage, the damage evolution process of rock before failure can be divided into five stages. Energy evolution curves can be used to quickly and accurately determine the CCS of specimens, including the initiation, closure, and damage strength of cracks. This suggests that the energy and CCS of schist depend closely on the schistose angle α. The specimen with α = 30° has the minimum crack initiation strength and the highest level of crack initiation stress, while the specimen with α = 90° has the lowest level of crack damage stress and higher elastic and dissipation energy. The mechanical anisotropy, closely related to the orientation dependence of crack initiation and propagation, is essentially controlled by the typical interbedded quasi-microstructure composed of clustered mica layers and granular mineral layers. The CCS and energy are significantly different for the two tested schist samples, and they are determined by microscale factors, such as the proportions of soft and hard minerals, aggregation degree of flaky minerals, and continuity of oriented mica clusters. The CCS and energy of schistose rocks are more sensitive to the various microscale factors at α = 30° than at α = 90°.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of loading direction on the critical characteristic strength and energy evolution of quartz mica schist and microscale mechanisms

Yin

Zhang

Lei

et al. 2021

Bull Eng Geol Environ

View full text Add to dashboard Cite

show abstract

“…Depending on the mechanism of their interactions with the rock strata, abandoned workings can be categorised into those in which the stress components are higher than gravity-induced stress state (their main source are unmined seam sections: protective pillars and mining edges) and those in which the stress component tends to decrease (de-stressed areas, mostly the goaf sections). In consideration of rockburst hazards, seismic events during mining operations in de-stressed zones are less likely (Mirek et al, 2016;Bańka et al, 2017) due to the dissipative effects of the goaf areas, yet the occurrence of the fracture zone in the seam section near the face is quite probable from the standpoint of geomechanics and mining practice. Therefore, a rockburst occurrence underneath the abandoned workings in a different coal seam cannot be entirely precluded.…”

Section: Introductionmentioning

confidence: 99%

Archives of Mining Sciences

Chlebowski

Burtan

Zorychta

2018

View full text Add to dashboard Cite

Recalling the body of experience gathered in the collieries of the Upper Silesian Coal Basin, the increased risk of seismicity and rockburst occurrences in confined conditions including the exploitation of remnants were identified. This study investigates geomechanical aspects of longwall mining in the areas affected by old excavations aimed at relaxation of a multi-bed deposits within a thick coal seam or a group of seams. It is assumed that high-energy seismicity is another factor determining the rockburst hazard alongside the state of stress. A case study is recalled, describing a colliery where mining-induced seismic activity of a de-stressed coal seam remained at the level comparable to or higher than it was experienced in the de-stressed seam operations. An analytical model was used to study the stress state and potential loss of structural continuity of an undisturbed rock body surrounding the longwall panel being mined beneath or over the abandoned workings. Recalling the developed model of the system involving nonlinear functions demonstrating the existence of abandoned mine workings within the rock strata, computer simulations were performed to evaluate the rockburst hazards along the face area. Discussions of results are based on observations of immediate roof convergence and the vertical stress concentration factor at the longwall face zone. Computational data of the modelled mining situations demonstrates that despite using the de-stressing method of mining, the occurrence of events impacting on mine working beneath and over abandoned workings cannot be precluded. Here the scale of rockburst hazards is determined by local mining and geological conditions, such as the type and extent of abandoned workings, their age and vertical distance between them and the coal seam currently mined.

show abstract

“…The intermittent nature of renewable energy has a considerable effect on energy supply security. 6,7 The demand for coal abandonment is driven by the shortage of theoretical and technical breakthroughs required to reduce the negative consequences of coal exploitation and utilization, for example, damage to geological formations, surface subsidence, equipment damage, human casualties, damage to the surface and ecological environments during mining, [8][9][10][11][12][13][14][15][16] and the emission of greenhouse gases during its utilization. [17][18][19] Despite these consequences, coal is still the dominant energy source used for electricity generation and primary energy consumption in many countries, as listed in Table 1.…”

mentioning

confidence: 99%

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Nie

Zhu

et al. 2020

Energy Science & Engineering

View full text Add to dashboard Cite

Coal remains a primary energy source for the foreseeable future. However, existing approaches for coal exploitation and utilization are highly detrimental to the geological formations from which they are extracted and the atmospheric environment. Moreover, underground mining can induce earthquakes that lead to fatalities and financial losses. The demand to abandon coal mining is increasing worldwide, and the need for efficient, safe, and environmentally acceptable coal exploitation and utilization has garnered widespread attention. We propose a novel unmanned automatic machine‐based mining and in situ conversion method for the safe and clean exploitation and utilization of subsurface coal resources. Solid coal is transformed in situ into fluidized energy resources using this method. To evaluate its effectiveness, a geological model of a coal mine was generated, and a numerical simulation based on the continuum‐based discrete element method was conducted to compare the mining‐induced stress distribution, roof subsidence, coal wall failure, and microseismicity for fluidized and traditional mining methods. Our results indicate that the proposed mining method can significantly reduce damage to the geological formation and greenhouse gas emissions associated with the exploitation and utilization of coal resources. We also discuss the limitations of the current study and future research possibilities.

show abstract

Predicting changes in induced seismicity on the basis of estimated rock mass energy states

Cited by 16 publications

References 11 publications

Effect of loading direction on the critical characteristic strength and energy evolution of quartz mica schist and microscale mechanisms

Effect of loading direction on the critical characteristic strength and energy evolution of quartz mica schist and microscale mechanisms

Archives of Mining Sciences

In situ fluidized mining and conversion solution to alleviate geological damage and greenhouse gas emissions due to coal exploitation: A numerical analysis and evaluation

Contact Info

Product

Resources

About