Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow

Zhang, Jiahua; Zhang, Biao; Zhang, Daobing

doi:10.1155/2019/2145616

Cited by 8 publications

(3 citation statements)

References 31 publications

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“…Several techniques are applied for bound calculation (e.g., witnesses/theoretical proofs, relaxation, and coarsening/restricting the original problem). Bound calculation is a traditional tool in operations research and it has been applied in many articles related to production, scheduling and planning, and other engineering problems [33][34][35][36][37].…”

Section: Lower Boundmentioning

confidence: 99%

Production Optimization in a Grain Facility through Mixed-Integer Linear Programming

et al. 2022

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This article introduces a Mixed-Integer Linear Programming model for cost optimization in multi-product multi-line production scheduling. This model considers discrete time windows and includes realistic constraints. The NP completeness of the problem is proven. A novel scheme based on embedding bounds is applied to speed up convergence. The model is tested on 16 input configurations of a real case study from the top Uruguayan grain production facility. The numerical results show that the model significantly improves the outcome of the current ad hoc heuristic planning, reducing on average 10% the overall production costs; and that the introduction of the embedded bounds-based scheme reduces significantly the elapsed time, on average by 22%.

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Section: Lower Boundmentioning

confidence: 99%

Production Optimization in a Grain Facility through Mixed-Integer Linear Programming

et al. 2022

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“…The pore water is a vital factor leading to instability of geotechnical engineering. For the problem of tunnel stability under the pore water effect, the pore water pressure was included as an external factor in the upper limit analysis method by several scholars [22][23][24]. The upper limit analysis theorem of pore pressure effect was established.…”

Section: Upper Bound Theorem Of Limit Analysis Considering the Pore P...mentioning

confidence: 99%

Stability Analysis of Shield Inclined Tunnel Faces under the Change Effect of Soil Heterogeneity and Pore Water with Buried Depth

et al. 2022

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The purpose of this work is to look at how soil heterogeneity and pore water pressure impact shield inclined tunnel excavation face stability as burial depth varies. The calculation model of excavation face stability was established, and the supporting pressure of maintain the excavation face stability was solved via the upper bound method. The results showed that the soil heterogeneity coefficient and pore water pressure coefficient had substantial effects on the supporting pressure. The location of failure face and failure range of shield inclined tunnel under varied heterogeneity coefficient and pore water pressure coefficient were presented. In addition, the boundary depth of shallow tunnel under the influence of soil heterogeneity and pore water was obtained, which supplemented the relevant tunnel code.

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“…In the process of tunnel excavation, water and mud inrush often occurs [1][2][3]. Although people have made considerable progress in understanding the mechanical properties of rock mass [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and theories and technologies of tunnel excavation and support have been greatly developed [21][22][23][24][25], it still cannot completely contain the occurrence of water and mud inrush. Every year, water and mud inrush still causes a large number of equipment losses and casualties [26].…”

Section: Introductionmentioning

confidence: 99%

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

et al. 2020

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When mountain tunnel passes through completely weathered granite strata, water and mud inrush is easy to occur, causing casualties and economic losses. Grouting is a common and effective treatment method for water and mud inrush disaster. The current existing researches focus on theoretical analysis, numerical simulation, and laboratory test, and the researches based on the field of engineering application are few. Based on the fully weathered granite tunnel of Junchang tunnel in Guangxi, this paper studies the grouting treatment of water and mud disaster in the fully weathered granite tunnel. This paper first introduces the geological and hydrological conditions of Junchang tunnel in order to understand the causes of water inrush and mud inrush. Then, the treatment method of full-section curtain grouting is introduced. During the grouting, the combination of exploration and injection is adopted. According to different hydrological conditions, different kinds of grouting materials are adopted. After grouting is completed, Transient Electromagnetic Methods, water inflow analysis, borehole investigation, and P-Q-T method are used to evaluate the grouting effect. According to the reaction of the detection results, the weak part of grouting can be supplemented to improve the grouting quality. The results show that the curtain grouting is effective for the treatment of water-mud inrush disaster in the fully weathered granite tunnel. This study provides a reference for the treatment of water and mud inrush in other similar tunnels.

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Upper Bound Analysis for Collapse Failure of Shield Tunnel Face Excavated in Unsaturated Soils Considering Steady Vertical Flow

Cited by 8 publications

References 31 publications

Production Optimization in a Grain Facility through Mixed-Integer Linear Programming

Production Optimization in a Grain Facility through Mixed-Integer Linear Programming

Stability Analysis of Shield Inclined Tunnel Faces under the Change Effect of Soil Heterogeneity and Pore Water with Buried Depth

Grouting Treatment of Water and Mud Inrush in Fully Weathered Granite Tunnel: A Case Study

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