Back-Calculation Method of Rock Mass Pressure in a Shallow-Buried Super Large-Span Tunnel Using Upper-Bench CD Method

Luo, Yanbin; Wu, Yunfei; Chen, Jianxun; Dong, Fangfang; Liu, Weiwei; Chen, Lijun; Li, Yao; Shi, Zhang

doi:10.1007/s12205-021-0312-6

Cited by 9 publications

(6 citation statements)

References 22 publications

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“…According to the analysis results in Section 3, it can be concluded that the rst pilot tunnel is affected by the disturbance of the later pilot tunnel, and the surrounding rock pressure will continue to rise. Luo et al constructed a surrounding rock pressure calculation method considering the mutual in uence of left and right pilot tunnels based on surrounding rock pressure monitoring data, and achieved good application results [22,23]. The reasonable construction of an empirical model for surrounding rock pressure based on monitoring data has a good application effect on super-large-section tunnels with complex construction mechanical responses.…”

Section: Overviewmentioning

confidence: 99%

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Support mechanical response analysis and surrounding rock pressure calculation method for a shallow-buried super- large-section tunnel in weak surrounding rock

Lai,

Wang,

Tan

et al. 2024

Preprint

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At present, China's demand for high-speed railway construction is constantly increasing, and the construction of Multi line high-speed railway tunnels has been put on the agenda. The design and construction issues of super-large-sections tunnels urgently need to be addressed. The Xiabei mountain No.1 and No.2 tunnels in the Hangzhou-Taizhou Railway are typical shallow-buried super-large-section-tunnels in weak surrounding rock, and their design and construction issues are representative. Eleven monitoring sections were set up in the tunnel, including tunnel deformation, surrounding rock, shotcrete, steel frames, bolts and temporary support mechanical responses. Taking the monitoring data of the most typical cross-section as an example, the mechanical response of the support structure of a shallow-buried super-large-section tunnel was analyzed in detail. Based on previous research results, this paper discusses and summarizes the common construction problems of this type of tunnel, and puts forward corresponding suggestions. The existing formula for calculating surrounding rock pressure has poor applicability to super-large-section tunnels constructed by step excavation, resulting in conservative support parameters. Therefore, based on the monitoring values of surrounding rock pressure at 10 monitoring sections in Xiabei mountain No. 1 and No.2 tunnels, empirical parameters reflecting the impact of step excavation were summarized. Based on the Wang formula and combined with the step excavation empirical parameters, an empirical formula for the surrounding rock pressure of shallow-buried super-large-section tunnels considering step excavation was constructed. The calculated results are in good agreement with the on-site monitoring data. This study can provide a good reference for similar projects.

show abstract

Section: Overviewmentioning

confidence: 99%

“…Gao et al discussed the formula for calculating the surrounding rock pressure of super-large-span tunnels [2]. Luo et al derived a formula for calculating the surrounding rock pressure of large-span tunnels considering step excavation, enriching relevant research results [22,23].…”

Section: Introductionmentioning

confidence: 99%

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow-buried super- large-section tunnel in weak surrounding rock

Lai,

Wang,

Tan

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…These challenges are magnified when tunnels are excavated in soft rock strata because of the weak properties and creep behavior of the rock mass [15][16][17]. Engineering experience and numerical studies have revealed that tunnel deformation and rock mass pressure are significantly affected by construction processes and support systems [18][19][20], thus highlighting the necessity of employing appropriate excavation procedures and support schemes for the successful completion of large-span tunnel projects.…”

Section: Railway Engineering Sciencementioning

confidence: 99%

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Zhou,

Jin,

Tian

et al. 2024

Railw. Eng. Sci.

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Excavating super-large-span tunnels in soft rock masses presents significant challenges. To ensure safety, the sequential excavation method is commonly adopted. It utilizes internal temporary supports to spatially partition the tunnel face and divide the excavation into multiple stages. However, these internal supports generally impose spatial constraints, limiting the use of large-scale excavation equipment and reducing construction efficiency. To address this constraint, this study adopts the “Shed-frame” principle to explore the feasibility of an innovative support system, which aims to replace internal supports with prestressed anchor cables and thus provide a more spacious working space with fewer internal obstructions. To evaluate its effectiveness, a field case involving the excavation of a 24-m span tunnel in soft rock is presented, and an analysis of extensive field data is conducted to study the deformation characteristics of the surrounding rock and the mechanical behavior of the support system. The results revealed that prestressed anchor cables integrated the initial support with the shed, creating an effective “shed-frame” system, which successively maintained tunnel deformation and frame stress levels within safe regulatory bounds. Moreover, the prestressed anchor cables bolstered the surrounding rock effectively and reduced the excavation-induced disturbance zone significantly. In summary, the proposed support system balances construction efficiency and safety. These field experiences may offer valuable insights into the popularization and further development of prestressed anchor cable support systems.

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“…Gao et al 35 discussed the formula for calculating the surrounding rock pressure of super-large-span tunnels. Luo et al 36 , 37 derived a formula for calculating the surrounding rock pressure of large-span tunnels considering step excavation, enriching relevant research results. The above research proposes excellent methods for calculating surrounding rock pressure, but neglects a series of unfavorable factors caused by size effects and step excavation.…”

Section: Introductionmentioning

confidence: 99%

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow buried super large section tunnel in weak surrounding rock

Lai,

Wang,

Tan

et al. 2024

Sci Rep

View full text Add to dashboard Cite

At present, China's demand for high-speed railway construction is constantly increasing, and the construction of Multi line high-speed railway tunnels has been put on the agenda. The design and construction issues of super-large-sections tunnels urgently need to be addressed. The Xiabei mountain No. 1 and No. 2 tunnels in the Hangzhou-Taizhou Railway are typical shallow-buried super-large-section-tunnels in weak surrounding rock, and their design and construction issues are representative. Eleven monitoring sections were set up in the tunnel, including tunnel deformation, surrounding rock, shotcrete, steel frames, bolts and temporary support mechanical responses. Taking the monitoring data of the most typical cross-section as an example, the mechanical response of the support structure of a shallow-buried super-large-section tunnel was analyzed in detail. Based on previous research results, this paper discusses and summarizes the common construction problems of this type of tunnel, and puts forward corresponding suggestions. The existing formula for calculating surrounding rock pressure has poor applicability to super-large-section tunnels constructed by step excavation, resulting in conservative support parameters. Therefore, based on the monitoring values of surrounding rock pressure at 10 monitoring sections in Xiabei mountain No. 1 and No. 2 tunnels, empirical parameters reflecting the impact of step excavation were summarized. Based on the Wang formula and combined with the step excavation empirical parameters, an empirical formula for the surrounding rock pressure of shallow-buried super-large-section tunnels considering step excavation was constructed. The calculated results are in good agreement with the on-site monitoring data. This study can provide a good reference for similar projects.

show abstract

Back-Calculation Method of Rock Mass Pressure in a Shallow-Buried Super Large-Span Tunnel Using Upper-Bench CD Method

Cited by 9 publications

References 22 publications

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow-buried super- large-section tunnel in weak surrounding rock

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow-buried super- large-section tunnel in weak surrounding rock

Exploring the feasibility of prestressed anchor cables as an alternative to temporary support in the excavation of super-large-span tunnel

Support mechanical response analysis and surrounding rock pressure calculation method for a shallow buried super large section tunnel in weak surrounding rock

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