Evaluation of vertical shaft stability in underground mines: comparison of three weight methods with uncertainty theory

Cui, Chao; Zhou, Jian; Zhou, Tao; Yong, Weixun

doi:10.1007/s11069-021-04885-5

Cited by 11 publications

(6 citation statements)

References 43 publications

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“…According to the failure analysis of a large-diameter shaft in the deep topsoil formation, the strength failure criterion of shaft wall concrete under multi-axial force is introduced, and the ultimate bearing capacity of the shaft wall considering the bidirectional force state is proposed (Equation ( 7)). In addition, based on the analysis of shaft wall stress in the deep topsoil stratum, the calculation method of operating stress on the shaft wall is improved (Equation (22)).…”

Section: Discussionmentioning

confidence: 99%

“…Since the mine shaft tower acts on the independent foundation, N 2 = 0. The relevant parameters (see Table 3) are substituted into Equation (22), and the stress acting on the shaft could be calculated; the results are listed in Table 2. The ultimate bearing capacities of the auxiliary shaft, the main shaft and the ventilation shaft are 22.22 MPa, 22.07 MPa and 21.73 MPa, respectively.…”

Section: The Ultimate Stress On a Coal Mine Shaft Wallmentioning

confidence: 99%

“…Liu et al analyzed and verified shaft stability based on a 3D model of the mining area constructed by using 3DMine-Rhion-Gridle-FLAC3D coupling in the process of mining [21]. Chen et al constructed seven ensemble models to achieve the linear and non-linear evaluation of shaft stability using uncertainty theory with different weight approaches and classification criteria [22]. However, most of these achievements are carried out by establishing statistical models or using numerical simulation software.…”

Section: Introductionmentioning

confidence: 99%

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Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

et al. 2022

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Shaft stability plays an important role in mine safety. Most of the previous studies focused on the stress analysis of shafts using monitoring data. Since the shaft wall state in the deep topsoil stratum is still not clear, the ultimate analysis method is adopted to study the bearing capacity and the strain of a large-diameter shaft wall in Yanzhou coal mine. First, the bearing capacity of the shaft wall is discovered. The value of the auxiliary shaft, main shaft and ventilating shaft is 22.22 MPa, 22.07 MPa and 21.73 MPa, respectively. Then, the ultimate strain of the shaft wall is obtained; the designed ultimate strain corresponding to those shafts is 1.468‰, 1.458‰ and 1.435‰, while the working ultimate strain is 2.078‰, 1.800‰ and 2.638‰, respectively. Since the working values are greater than the design values, the shaft walls need to be reinforced, which is consistent with the field situation. Finally, numerical analysis based on the finite difference method (FDM) is performed to investigate the evolution process of ultimate strain on the shaft wall. The results show the ultimate strain could provide a theoretical basis for safe service and management of a large-diameter shaft in a deep topsoil area.

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Section: Discussionmentioning

confidence: 99%

Section: The Ultimate Stress On a Coal Mine Shaft Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

et al. 2022

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“…Where, L ik is the grade of sample i th , and L ik ∈ Ω, (Ω {L 1 , L 2 , L 3 , ..., L k , ..., L K }. λ(λ ≥ 0.5), normally, λ 0.6 or λ 0.7 (Zhou et al, 2020a;Zhou et al, 2020b;Zhou et al, 2021b;Chen et al, 2021).…”

Section: Credible Identification Principlementioning

confidence: 99%

Developing an evaluation model based on unascertained measurement for evaluation of tunnel squeezing

et al. 2022

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Tunnel squeezing brought great difficulties to the construction and severely threatened the safety of on-site operators. The researches regarding large deformation evaluation have been widely developed, but actual conditions of tunnels are considerably complex, producing a large variety of uncertainty information existing in the evaluation process. Therefore, we constructed an unascertained measurement model incorporating four membership functions for evaluation of tunnel squeezing based on the collected datasets. Simultaneously, information entropy was introduced to objectively calculate the index importance for each index. For the first group data (GPI), the accuracy associated with four membership functions are 100%, 83.33%, 50%, and 83.33%, respectively, while the accuracy of GPII are 70%、77.5%、67.5%, and 70%, respectively. Linear function and parabolic function show better performance on uncertainty information interpretation according to the classification results. The results revealed that the uncertainty model constructed in this study can enrich the available uncertainty evaluation system.

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“…As the strategic passage of a coal mine, the security of vertical shaft is of great significance in protecting the safety of personnel and normal production [1][2][3][4]. The additional force induced by drainage settlement of the topsoil has been proven to play an important role in the breakage of shafts [5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

et al. 2022

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The vertical additional force induced by the drainage consolidation settlement of the topsoil is one of the main factors for shaft wall fracture. To date, the number of aquifers of topsoil rises with the depth increasing of shaft, which would lead to a more serious additional force effect. Thus, studying the vertical additional force law of the shaft when drainage settlement occurs in its surrounding topsoil containing multiaquifers is of great significance to predicting the shaft stress and guarantying shaft safety. In this study, mechanical analysis of the topsoil with the shaft crossing multiaquifer was carried out, and the settlement of each aquifer and aquiclude was calculated by separating the single-slope drainage consolidation and the double-slope drainage consolidation. Then, the calculation model of vertical additional force was established due to the settlement caused by the reaction of the additional force on the topsoil containing multiaquifers, and the calculation model of shaft wall stress was also developed. Verification of this model was conducted by comparing the filed measurement data of the shaft wall strain and the theoretical data calculated by the stress model. Finally, the effect laws of drainage velocity, central aquifer thickness, location, and number on the additional force were obtained and analysed. This paper is expected to provide theoretical support for predicting the additional force and shaft wall stress during its service time.

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Evaluation of vertical shaft stability in underground mines: comparison of three weight methods with uncertainty theory

Cited by 11 publications

References 43 publications

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

Critical Instability Criterion of Large-Diameter Shafts in Deep Topsoil Based on Ultimate Strain Analysis

Developing an evaluation model based on unascertained measurement for evaluation of tunnel squeezing

Analysis on the Vertical Additional Force of Shaft and Drainage Settlement Characteristics of Topsoil Containing Multiaquifers

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