Determination of time-dependent strengths of salt pillars based on strain energy principle

Junthong, Prapasiri; Khamrat, Supattra; Sartkaew, Suratwadee; Fuenkajorn, Kittitep

doi:10.1016/j.ijmst.2018.04.011

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…It is more universal to explain the failure mechanism of rock in terms of energy. Research shows that the energy characteristics of rock deformation and failure vary with the storage environment (Li et al, 2014;Zhao et al, 2015;Junthong et al, 2019;Zhou Z. et al, 2020;Ma et al, 2021). Research shows that the energy characteristics of rock deformation and failure vary with the storage environment (Si and Gong, 2020;Xie et al, 2021).…”

Section: Introductionmentioning

confidence: 97%

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

et al. 2022

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Research on early warning of rock disaster based on the energy theory is closer to the essence of rock failure. In this paper, static compression tests and acoustic emission (AE) tests of coal rock under 0, 8, 16, and 25 MPa confining pressures were carried out on the MTS815 test system. Energy evolution law in the rock failure process was analyzed according to the relationship between mechanical parameters, AE parameters, and energy dissipation rate (EDR) in the rock failure process. Eventually, a new index for evaluating rock failure precursors was proposed based on EDR. The results show that the EDR has a good correlation with mechanical strength and AE events under different confining pressures. The deformation and failure characteristics of coal rock can be truly characterized by EDR. The variation of EDR can be divided into a quiet stage, a stable increasing stage, an active stage, and a stable stage. The EDR level in the quiet stage is obviously enhanced by confining pressure. When EDR reaches the peak, AE events increase rapidly. In the active stage, the EDR peak value is concentrated and large, the AE event is highly active, and stress drops abruptly, indicating that the EDR is reliable for evaluating the rock failure process. Compared with AE test results, it is found that the warning stress and warning time of the EDR failure precursor occur later than that of the AE failure precursor, and the former is closer to the peak stress of rock, which is more universal in engineering and could provide a better reference value for preventing rock disaster.

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Section: Introductionmentioning

confidence: 97%

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

et al. 2022

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“…The basic parameters considered must offer the possibility of obtaining the necessary data and information to be able to elucidate the geomechanical processes that manifest themselves in the salt massif and establish analytical methods and models for the interpretation of these processes [8]. Based on them, an efficient design can be carried out on the geometric and technological parameters of the salt exploitation methods, especially in conditions where the exploitation depth increases [9][10][11]. In order to characterize the physical state of the salt and its influence on solving the problem of stability and reliability of the geometric elements (pillars, slabs, etc.)…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Exploitation System with Room and Pillar by Analytical Methods

Toderas

2024

Applied Sciences

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The mining method that is still often used in salt deposits is the room-and-pillar mining method, in which the dimensioning of the most requested element in the system is followed. The pillars are the elements subjected to the greatest loads. Knowing the size and distribution mode of the secondary state of stress—deformation—is a necessity that can lead to the design and realization of stable, reliable underground excavations. This paper proposes an analytical assessment model of the secondary stress state in the pillars between the operating rooms, as well as in the whole system room–pillar–floor, based on the results obtained from laboratory research through modeling and in situ research. For this purpose, the evaluation of the secondary stress state was carried out considering the following methods: (1) the dimensioning method based on the theory of limit equilibrium, taking into account the effective stress in the pillars; and (2) the mechanics of the continuous environment based on the design of some analytical models for evaluating the secondary stress-deformation state in the pillar and floor. The exploitation of one of the largest salt deposits in Romania is used as a case study, and the stability of the exploitation system with rooms and pillars is evaluated by analytical methods. The secondary state of tension was calculated at different points on the height of the pillar. Through the proposed algorithm, the value of the axial component of the secondary stress state at different points along the axis of a pillar located at a depth of 100 m varies between 1.498 and 1.657 MPa, compared to the value obtained by the finite element method and in situ measurements, which was 1.64 MPa. The comparison revealed a high degree of agreement between the results obtained for the depth of 100 m using both the FEM and laboratory and in situ measurements. This suggests that the proposed algorithm is a reliable method for predicting the secondary stress state. The presented algorithm can be extended in the field of mining deposits, where mining methods with rooms and pillars are used.

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“…Then how to treat the loss of coal resource and repair the generated seam floor failure becomes the next question. Accordingly, during or after coal mining, there are some primary remedial engineering measures used to prevent water inrush from confined aquifers underlying coal seams (Cai et al 2019;Junthong et al 2019;Meng et al 2018;Niedbalski et al 2018;Palarski et al 2011Palarski et al , 2014Strozik 2017). One measure is draining the aquifer to lower the pressure on the aquiclude, but the aquifer is usually so thick that the aquifer is usually overdrained over long period without knowing how much water should be drained, which leads to many environmental problems (Meng et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Development of a combined mining technique to protect the underground workspace above confined aquifer from water inrush disaster

Zhu

et al. 2020

Bull Eng Geol Environ

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One task facing by the geotechnical engineers is to protect the workspace in an underground construction/excavation site from various forms of geological disasters, such as the water inrush, rock burst, and collapse of the surrounding rock/soil. In this paper, a combined controlling measure was proposed based on underground mining and water environment: the method of strip mining has been initially proposed as an effective measure against underground workspace floor failure when mining above confined aquifer in the Bucun coal mine, China, and however, its ability to avoid floor water inrush has yet to be demonstrated; in the next step, field trials using caving zone backfill technology to prevent underground workspace floor failure and excavate retained strip coal pillars were implemented based on the theoretical calculation and numerical simulation results. Engineering practice showed that the failure depth of the underlying strata of the workspace had no growth without the possibility of water inrush, and the safety of the underground space was achieved. Thus, this study represents a successful attempt to develop the combined strip mining and caving zone backfilling technique to ensure the safety of the underground workspace and control surface subsidence when excavating the retained strip coal pillars above confined aquifer. The proposed combined technique can also be used in other underground excavation activities with similar problems.

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Determination of time-dependent strengths of salt pillars based on strain energy principle

Cited by 12 publications

References 7 publications

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

Stability Analysis of the Exploitation System with Room and Pillar by Analytical Methods

Development of a combined mining technique to protect the underground workspace above confined aquifer from water inrush disaster

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