Numerical Calculation Analysis of the Structural Stability of Cemented Fill under Different Cement‐Sand Ratios and Concentration Conditions

Zhao, Kang; Li, Qiang; Yan, Yajing; Zhou, Keping; Gu, Shuijie; Zhu, Shengtang

doi:10.1155/2018/1260787

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…A large number of rock mechanics test results show that the rock mass is destroyed when the load exceeds the ultimate load, and the residual strength decreases gradually with the development of deformation in the plastic flow after the peak strength [18,19]. The failure envelope of the Mohr-Coulomb model is the combination of the shear and tension stress yield functions.…”

Section: Selection Of Failure Criteria For Rock Massmentioning

confidence: 99%

Stability of stope structure under different mining methods

Zhao¹,

Xiang²,

Gu³

et al. 2019

J. vibroeng.

Self Cite

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The ore body has a great influence on the stability of surrounding rock and mining safety under different mining modes, and the reasonable selection of mining mode depends on other characteristics, such as ore structure surface feature, rock mass mechanical property, and ground stress distribution. Given the insufficient mining research data, this study establishes a 3D model by using the FLAC3D calculation program. Through numerical simulation and other technical means, a preliminary study on plastic and minimum stress changes during horizontal pillar mining, stress changes under different mining modes, and the effect comparison of full filling mining modes is conducted. Results show that the surrounding rock at the corner of pillar 1 is damaged, the plastic zone decreases, and the minimum stress in each working procedure increases slightly. The area of the plastic zone in alternate mining is smaller to that in continuous mining. This study provides a theoretical basis for ore body mining.

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Section: Selection Of Failure Criteria For Rock Massmentioning

confidence: 99%

Stability of stope structure under different mining methods

Zhao¹,

Xiang²,

Gu³

et al. 2019

J. vibroeng.

Self Cite

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“…Deformation in Solid Backfill Stope Solid backfill mining has the same coal mining process as traditional collapse method coal mining, the only difference is that solid backfill mining fills solid backfill material into the void area in time after coal seam mining, and forms the roof support system in the void area together with surrounding rock and coal pillars, thus achieving the purpose of controlling the sinking and movement of overburden and preventing surface subsidence and damage [14][15][16]. The traditional natural caving mining method is to manage the roof of gob by adopting the method of free caving of overburden rock.…”

Section: Response Analysis Of Surrounding Rockmentioning

confidence: 99%

Study on Deformation Response Law of Surrounding Rock in Solid Backfill Mining Stope

Lai,

Wu,

Cao

et al. 2024

Advances in Civil Engineering

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To fully control the roof and surface and reduce the ecological damage caused by mining, it is necessary to understand the deformation response law of the surrounding rock in solid backfill mining. The similarities and differences of overburden movement characteristics between natural caving method and solid backfill method are analyzed and compared by means of on-site investigation and monitoring, theoretical derivation and analysis, numerical simulation and effect verification. The control mechanism of backfill mining on the roof is clarified, and the relationship between stope roof displacement and support pressure of backfill body is established. Furthermore, the mechanical conditions of immediate roof in equilibrium state during backfill mining are established. The FLAC3D simulation indicates that the solid backfill mining face has a concentrated stress peak located 15 m ahead of the coal wall. Within the range from 0 to 5 m, the abutment pressure is reduced gradually. However, within the range from 5 to 15 m, the abutment pressure is increased evidently. The stress concentration is located 35 m behind the working face. With continuous backfilling of the goaf, the maximum displacement occurs in the backfill body near the working face. The total deformation of the surrounding rock in the goaf is reduced by 58%. The total deformation of coal wall is reduced by ∼37.5%. The subsidence coefficient is reduced from 0.59 to 0.013 by using the backfill mining technology. The research results provide theoretical guidance and reference for roof control and ecological protection of backfill mining.

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“…The cement‐sand ratios of 1:4, 1:6, and 1:8 are commonly used in mining practice and laboratory 35–38 . The amount of 1:6 was selected as the content of this study.…”

Section: Verification Of the Synergy Relationships Between Backfill And Pillarmentioning

confidence: 99%

Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

Sun

Feng

et al. 2021

Num Anal Meth Geomechanics

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The influence of the strength of the pillar on the bearing characteristics of the backfill‐pillar system (BPS) based on the mechanism of backfill. Quantitative synergy relationships between backfill and pillar were defined and pointed out. There are four kinds of quantitative synergy relationships in the bearing process of the system. To verify the relationship, systems with different strengths of the pillar were selected to carry out numerical simulation experiments, and a mathematical calculation method to quantify synergy relationship in the BPS was designed. The results show that the system under the low strength of the pillar presents the overall increase in bearing characteristics, while the system under the high strength of the pillar presents “N”‐type bearing features. Four kinds of quantitative synergy relationships able to characterise the action mechanism between backfill and pillar in each stage of the bearing of the system. Through analysis and discussion, it was concluded that the essential reason for the difference in bearing characteristics is that the effect of displacement restraint, joint support, and passive compressive weaken with the increase of the strength of pillar. The effect of pillar strength on the internal synergy of BPS is well verified by numerical simulation test.

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Numerical Calculation Analysis of the Structural Stability of Cemented Fill under Different Cement‐Sand Ratios and Concentration Conditions

Cited by 5 publications

References 6 publications

Stability of stope structure under different mining methods

Stability of stope structure under different mining methods

Study on Deformation Response Law of Surrounding Rock in Solid Backfill Mining Stope

Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

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