Study on Expansion Characteristics and Expansion Potential of Gypsum Rock

Fu, Junfu; Li, Huayun; Zhu, Kaicheng; Chen, Yelei; Lei, Zhongcheng

doi:10.1155/2022/6921150

Cited by 4 publications

(4 citation statements)

References 66 publications

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“…Shallow buried tunnels with a basic ground level are loaded symmetrically. The vertical uniform pressure can be determined according to Equations ( 3)-( 5) and the horizontal uniform pressure can be calculated according to Equation (6).…”

Section: Calculation Of Surrounding Rock Pressure Under Shallow Buria...mentioning

confidence: 99%

“…As an integral part of high-speed railways, the construction scale of tunnels also increases year after year [1][2][3]. With the increase in the operation time of high-speed railway tunnels, many factors, such as lining structure damage [4], dry-wet cycle [5], special surrounding rock [6], frost heaving cycle [7], groundwater [8] and other factors may lead to safety risks, of which damage to the lining structure is one of the most important [9].…”

Section: Introductionmentioning

confidence: 99%

“…Sandrone et al [17] proposed a long-term safety analysis method for tunnels based on the converging-constraint method for the deterioration of surrounding rock and concrete under aging, weathering and other conditions. Fu et al [6] studied the gypsum rock surrounding Wuzhishan Tunnel and found that the volume of the rock increased after absorbing water, which then produced a swelling effect on the lining structure. Xu et al [18] studied the deterioration of concrete in a freeze-thaw environment based on a numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

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Safety Evaluation of Plain Concrete Lining Considering Deterioration and Aerodynamic Effects

Wang

et al. 2023

Sustainability

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With an increase in the service time of high-speed railway tunnels, various defects caused by construction-quality defects in the secondary lining begin to appear. How to evaluate the safety of such tunnels and take countermeasures is very important for the safe operation of tunnels. Based on the load-structure method and a numerical simulation, this paper studied the short-term and long-term safety of the missing section of anti-crack reinforcement mesh in the plain concrete lining of a high-speed railway mountain tunnel. The short-term safety evaluation considered the influence of negative pressure caused by aerodynamic effects. The long-term safety evaluation considered the combined influence of the surrounding rock and concrete deterioration and the negative pressure and concrete fatigue damage caused by aerodynamic effects. The results showed that under the negative pressure generated by aerodynamic effects, the minimum tensile safety factor of the lining in the defective section increased by 3.8%, while the minimum compressive safety factor of the lining decreased by 7.9%. The negative pressure generated by the aerodynamic effects had little impact on the short-term safety of the lining in the defective section. During the long-term safety evaluation, the overall safety of the defective section decreased significantly, and the minimum tensile and minimum compressive safety factors of the lining decreased by 59.4% and 66.8%, respectively. The calculation results for the initial design do not meet the long-term design requirements and cannot guarantee the long-term safe operation of the tunnel. Finally, two new strengthening methods of galvanized steel mesh-short bolts and galvanized corrugated steel plate-short bolts were proposed to strengthen the defective section of the concrete lining, so as to improve the ultimate bearing capacity and toughness of the plain concrete lining structure.

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Section: Calculation Of Surrounding Rock Pressure Under Shallow Buria...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Safety Evaluation of Plain Concrete Lining Considering Deterioration and Aerodynamic Effects

Wang

et al. 2023

Sustainability

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“…With the rapid development of tunnel engineering in China, it is inevitable to encounter complex and unfavorable geological strata during the construction process [1][2][3][4][5]. Among them, the loess strata, due to their obvious structure, high permeability, collapsibility, and vertical joint development [6][7][8][9][10], will face construction risks such as water leakage, large deformation, falling blocks, and collapse when constructing tunnels in this stratum [11][12][13][14]; especially, the collapsibility of loess often causes the sudden instability of the surrounding rock in a short period, leading to disasters [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Deng,

Zhang,

et al. 2024

Water

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The high water content of the surrounding rock in loess tunnels will lead to the deterioration of rock strength, causing deformation and damage to the initial support structure and thereby affecting safety during construction and operation. This article first analyzes the strength characteristics of loess under different water contents through indoor physical and mechanical tests. Secondly, based on numerical simulation results, the ecological environment, and design requirements, the water content threshold is determined. Finally, a reinforcement scheme combining surface precipitation measures and curtain grouting measures is proposed, and the reinforcement effect is analyzed based on on-site monitoring data. The results show that as the water content of loess increases, the cohesion, internal friction angle, and elastic modulus of the surrounding rock all decrease, leading to an increase in the sensitivity of the surrounding rock to excavation disturbances and a deterioration in strength. During the construction process, it shows an increase in the vault settlement and sidewalls’ convergence. During the process of increasing the distance between the monitoring section and the palm face, the settlement and convergence of the tunnel show a rapid growth stage, slow growth stage, and stable stage. The water content threshold is determined to be 22%. The reinforcement scheme of combining surface precipitation measures with curtain grouting measures not only meets the requirements of the ecological environment but also makes the settlement and convergence values lower than the yellow warning deformation values required by the design.

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Nanoemulsion carriers of porous γ-alumina modified by polyvinylpyrrolidone and carboxymethyl cellulose for pH-sensitive delivery of 5-fluorouracil

Shamsabadipour

Pourmadadi

Yazdian

et al. 2023

International Journal of Biological Macromolecules

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Study on Expansion Characteristics and Expansion Potential of Gypsum Rock

Cited by 4 publications

References 66 publications

Safety Evaluation of Plain Concrete Lining Considering Deterioration and Aerodynamic Effects

Safety Evaluation of Plain Concrete Lining Considering Deterioration and Aerodynamic Effects

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Nanoemulsion carriers of porous γ-alumina modified by polyvinylpyrrolidone and carboxymethyl cellulose for pH-sensitive delivery of 5-fluorouracil

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