Guarantee Rate Statistics and Product-Moment Correlation Analysis of the Optimal Deformation Allowance for Loess Tunnel in China

Applied Sciences, Год журнала: 2025, Номер 15(5), С. 2451 - 2451

Опубликована: Фев. 25, 2025

The relevant value standards for reserved deformation of tunnels with different types loess soil are not yet perfect. Through mathematical statistics, literature research, and other methods, 148 monitoring sections were investigated. Pearson, Kendall, Spearman correlation coefficients used to analyze the influence surrounding rock grade, moisture content, burial depth on law tunnels, providing reference tunnels. research results indicate that: (1) between type convergence around tunnel is strong, followed by excavation span, content weak. Therefore, design should focus considering span. (2) For class IV rock, allowance cohesive silty can be set within 15 cm, sandy loess, it 15–20 cm. (3) section V-grade margin determined as follows: viscous 35–47.5 (4) mainly distributed 11% 23%. It worth noting that in sections, arch settlement more significant compared sections. (5) crown affected changes coverage has discreteness. When 16 assurance rate reach 84.6%. Finally, rationality proposed amount was verified through engineering practice. provide related similar projects.

Язык: Английский

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Investigating fracture response characteristics and fractal evolution laws of pre-holed hard rock using infrared radiation: Implications for construction of underground works

Tunnelling and Underground Space Technology, Год журнала: 2025, Номер 161, С. 106594 - 106594

Опубликована: Март 31, 2025

Язык: Английский

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Enhancement of Cement-Based Materials: Mechanisms, Impacts, and Applications of Carbon Nanotubes in Microstructural Modification

Buildings, Год журнала: 2025, Номер 15(8), С. 1234 - 1234

Опубликована: Апрель 9, 2025

Carbon nanotubes (CNTs) exhibit high strength and modulus, excellent electrical thermal conductivity, good chemical stability, unique electronic optical properties. These characteristics make them a one-dimensional nanomaterial with extensive potential applications in fields such as composite materials, devices, energy, aerospace, medical technology. Cement-based materials are the most widely used extensively applied construction materials. However, these have disadvantages low tensile strength, brittleness, porosity, shrinkage, cracking. In order to compensate for shortcomings, recent years, relevant scholars proposed integrate CNTs into cement-based Incorporating not only enhances microstructure of but also improves their mechanical, electrical, durability The fabrication process reviewed this paper. different effects on physical properties hydration due design parameters, dispersion methods, temperature were analyzed. results show that compressive flexural CNT 0.02% content increased by 9.33% 10.18% from 3 d 28 d. terms reducing shrinkage carbonization resistance cement base, there is an optimal amount carbon nanotubes. addition dispersed reduces resistivity, nucleation promotes reaction. general, under dosage, uniform short length–diameter ratio significant effect lifting effect. future, will develop multifunctionality, cost, realizing intelligent self-sensing self-repair promoting green low-carbon manufacturing. Breakthroughs decentralized technology large-scale key, they expected help sustainable civil engineering infrastructure.

Язык: Английский

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Influence of fissure-induced linear infiltration on the evolution characteristics of the loess tunnel seepage field

Tunnelling and Underground Space Technology, Год журнала: 2025, Номер 162, С. 106640 - 106640

Опубликована: Апрель 11, 2025

Язык: Английский

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