A Solution to the Time‐Dependent Stress Distribution in Suborbicular Backfilled Stope Interaction with Creeping Rock

Yan, Baoxu; Lai, Xingping; Jia, Hanwen; Yilmaz, Erol; Hou, Chen

doi:10.1155/2021/5533980

Cited by 13 publications

(4 citation statements)

References 49 publications

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“…At the moment, FA is mainly used as an additive for cement and the preparation of cementitious materials, while DG is mainly used to prepare gypsum-based new building materials [12,13]. Numerous scholars and engineers have conducted the feasibility of the above two types of solid waste utilization [14,15]. It was found that the risk assessment codes in FA posed no or low risk [16], while the heavy metals in DG showed a medium risk to the ecosystem [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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The utilization of solid wastes (SWs) as a potential resource for backfilling is not only conducive to environmental protection but also reduces the surface storage of waste. Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. Ordinary Portland cement (OPC) was used as cement in mine backfill. To better investigate the feasibility of preparing backfill materials, some laboratory tests, such as uniaxial compressive strength (UCS), scanning electron microscopy (SEM), and energy dissipation theory, were conducted to explore both strength and microstructural properties of backfilling. Results have demonstrated that the main components of FA and DG in this study are oxides, with few toxic and heavy metal components. The ideal ratio of OPC:FA:DG is 1:6:2 and the corresponding UCS values are 2.5 and 4.2 MPa when the curing time are 7 days and 14 days, respectively. Moreover, the average UCS value of backfilling samples gradually decreased when the proportion of DG in the mixture increased. The main failure modes of various backfilling materials are tensile and shearing cracks. In addition, the corresponding relations among total input energy, dissipated energy and strain energy, and stress–strain curve were investigated. The spatial distribution of oxygen, aluminum, silicon, calcium, iron and magnesium elements, and hydration product are explored from the microstructure’s perspective. The findings of this study provide both invaluable information and industrial applications for the efficient management of solid waste, based on sustainable development and circular economy.

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Section: Introductionmentioning

confidence: 99%

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

2021

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“…e drop in e value causes the water drainage and a sharp rise in the fill's density. is causes the continued hydration process to generate bigger quantities of hydration product that fills the spaces between particles, thus significantly reducing the void ratio [52]. is is not the case for CPB-D1 and CPB-D2 samples, although the void ratios were noticeably reduced in all samples.…”

Section: Assessment Of Voidmentioning

confidence: 89%

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

Kasap

Yilmaz

Guner

et al. 2022

Advances in Materials Science and Engineering

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As a result of developing technology and scientific studies, employing dam tailings as critical raw material and vital economic reserve has become widespread recently. Employing dam tailings as a main ingredient of CPB (cemented paste backfill) can offer benefits to mining operations. This study deals with the use of dam tailings in CPB, considering the mechanical and geotechnical aspects. CPB was prepared at fixed solid and cement contents (72%, and 5%, respectively) and tested for different cure ages varying from 3 to 56 days. The results disclosed that the strength of filling increased over time, with the exception of 56-day cured CPB having high sulfur minerals where strength decreased sharply. The reasons behind these strength surges could be clarified by CPB’s basicity, which quickens the hydration of cement. Voids between tailings grains are also occupied by hydration products, resulting in the high strengths. Due to the fact that higher sulfate contents can cause lower pH values within CPB, this is one of the factors that should be considered for the backfill’s strength performance. The cement tends to increase the backfill’s pH in short term, but pH of long-term cured backfills decreases because of dam tailings which is inclined to acid formations and erosions. This is a sign that the deformation properties of CPB are deteriorated. Depending on curing time, CPB’s water content and void ratio decrease, but their surface areas increase. The resulting data will endow to better apprehend the effects of dam tailings on CPB quality integrating cost and quality.

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“…24 Yan et al's study research explains the coupling effect of creep behavior and internal pressure in backfill stope and calculates the theoretical solution considering the time effect to verify the correctness. 25 To address limitations in numerical simulation software models, many scholars frequently adopt combined element models to simulate measured stress-strain-time curves. They introduce damage mechanics and fracture mechanics to reflect the constitutive model of damage accumulation and crack propagation during the aging deformation of rock mass.…”

Section: Introductionmentioning

confidence: 99%

“…Yan et al's study research explains the coupling effect of creep behavior and internal pressure in backfill stope and calculates the theoretical solution considering the time effect to verify the correctness 25 …”

Section: Introductionmentioning

confidence: 99%

A viscoelastic–plastic constitutive model incorporating creep initiation stress for surrounding rock in deep roadways and its practical application

Kang,

Gong,

et al. 2024

Energy Science & Engineering

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With the increasing depth of engineering in rock masses, the issue of significant rheological deformation becomes notably prominent. To accurately characterize the deformation and failure behavior of the surrounding rock near the goaf in deep small coal pillars, we have developed a viscoelastic–plastic constitutive model that takes into account the initial stress associated with creep. This model builds upon an existing viscoelastic–plastic constitutive framework and is implemented numerically using C++ in the FLAC3D. The Oedometer test method is used to check the creep components and the calculated parameter (η/G) ensure convergence of numerical operations. We conducted both pre‐improvement and post‐improvement tests of the constitutive model in a simple numerical analysis of roadways. The enhanced model demonstrates improved accuracy in deviational stress calculations and proves suitable for modeling deep, soft roadways. Furthermore, we applied the improved model to simulate actual working conditions at Zhaozhuang Mine, where mining operations near the working face induce a fracture zone of approximately 3 m in the small coal pillar located at the goaf's edge. The new model closely aligns with the observed results, further validating its suitability for tunneling along the goaf. Tunneling and mining activities result in significant deformation at various locations, including the shoulder socket of the working face, the top angle of the coal pillar, and the bottom angle of the floor. The crushing zone at the working face extends up to 4 m. Rheological effects transform the triangular elastic core, from its original high‐pressure elastic state to a fracture and plastic zone in the deep coal. Stress in deep coal is transmitted along the triangular elastic core. Numerical simulation results closely match the excavation profile of the tunneling, providing valuable insights into the impact of mining activities. This study can provide reference for deformation of similar geological conditions and engineering situation.

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A Solution to the Time‐Dependent Stress Distribution in Suborbicular Backfilled Stope Interaction with Creeping Rock

Cited by 13 publications

References 49 publications

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

Analysis of Strength and Microstructural Characteristics of Mine Backfills Containing Fly Ash and Desulfurized Gypsum

Recycling Dam Tailings as Cemented Mine Backfill: Mechanical and Geotechnical Properties

A viscoelastic–plastic constitutive model incorporating creep initiation stress for surrounding rock in deep roadways and its practical application

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