Model test and numerical simulation research on the mechanical response law of lager span and small interval tunnels constructed by CD method

Li, Liping; Fan, Hongyun; Liu, Hongliang; Li, Shangan; Cheng, Shuai; Zhang, Qihua; Tu, Wenfeng; Zhou, Shen Jie

doi:10.1016/j.tust.2022.104947

Cited by 21 publications

(6 citation statements)

References 15 publications

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“…1 ⃝ excavation of the right guide hole; 2 ⃝ excavation of the left guide hole; 3 ⃝ construction of the right middle partition wall; 4 ⃝ construction of the left middle partition wall; 5 ⃝ excavation of the right side hole; 6 ⃝ construction of the right hole's initial support structure;…”

Section: Construction Schemementioning

confidence: 99%

“…With the rapid expansion of urban railways, the construction of subway tunnels has progressively revealed the evolution features of enormous burial depth, large sections, and big spans [1][2][3][4][5]. The increase in the number of large-section tunnels has also created some engineering challenges, such as surrounding rock deformation [6][7][8], support structure instability [9][10][11], and lining cracking [12][13][14], which have seriously threatened project construction and operation safety. Especially because of the complex structure, large span, and cumbersome working procedures, multi-arch tunnels are prone to large surrounding rock distortion and supporting structure instability.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Yang,

Li,

Zhang

et al. 2024

Buildings

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With the fast progress of infrastructure projects, super-large cross-section projects are constantly emerging, and, therefore, engineering challenges and problems are increasing. Taking the triple-arch tunnel project in the turn-back line section of Santunbei Station in Urumqi Metro Line 1# as a case study, this research applied numerical simulation software Midas GTS/NX 2022 for the analysis of tunnel force and deformation in triple-arch cross-sections under different support forms of partition wall. Following the optimization of the support design of the mixed partition wall to a single straight wall, the following analytical results were obtained: surface settlement was decreased by 21.15% at the original cross-section; maximum values of principal stress and displacement of partition wall were decreased by 6.73 and 10.64%, respectively; and corresponding values for initial support structure were decreased by 21.47% and 54.74%, respectively. Meanwhile, combined with comparative analysis of engineering measurement and numerical simulation results, surface settlement and vault deformation were found to be similar to the optimized simulation results, which not only verified the reliability of simulation results but also ensured the safe and smooth construction of the project, greatly improving construction efficiency and saving construction time and cost.

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Section: Construction Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Yang,

Li,

Zhang

et al. 2024

Buildings

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“…In favorable geological conditions, the full-face method [7] or the benching method [8] are commonly adapted. In challenging geological conditions, options include the center diaphragm method with multiple sections [9,10], the cross-diaphragm method [11,12], or the method of circular excavation with reserved core soil [13]. For the study cases where the thickness of the interlaid rock is small, it is necessary to optimize conventional excavation methods.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Surrounding Rock for Neighborhood Tunnels Using the Schwarz Alternating Method Model: A Case Study

Wu,

Gong,

2024

Applied Sciences

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During the drilling and blasting excavation of neighborhood tunnels, blast-induced vibrations negatively affect the stability of the interlaid rock, particularly for the following tunnel. This paper presents a case study of neighborhood tunnels with small clearance in Shenzhen, China, where the minimum thickness of interlaid rock is only 0.5 m. Therefore, the tunnelling method of the following tunnel should be precisely designed to ensure the safety of surrounding rock. Initially, we investigated the damage mechanism of the interlaid rock under the blasting load from the following tunnel using LS-DYNA R11.1 software. To control the damage of the interlaid rock caused by the following tunnel blasting, the four-part excavation method with a reserved vibration-cushioning layer for the following tunnel is proposed. Subsequently, the analytical stress of the surrounding rock for neighborhood tunnels was obtained by the Schwarz alternating method (SAM). By analyzing the variation patterns with different thicknesses of the cushioning layer, the optimal thickness of the cushioning layer was determined to be 3.0 m. Consequently, a safety excavation partition scheme was implemented for the following tunnel. As a result of this case study, suggestions were identified for the safe excavation of neighborhood tunnels with small clearance.

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“…Scholars worldwide have made a series of studies on the regularity of strata deformation and settlement. Field experiments [7][8][9][10], numerical simulation [11][12][13][14][15], empirical formula calculation [16][17][18], and physical model tests [19][20][21] are mainly applied to analyze the regularity of deformation and settlement of surrounding rocks during excavation. After analyzing a mass of surface deformation data and related engineering data, Peck put forward the conclusion that the ground surface settlement is normally distributed and proposed a formula for estimating ground surface settlement distribution and the maximum settlement amount [22].…”

Section: Introductionmentioning

confidence: 99%

Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata

Zhou¹,

Qiu

Sun

et al. 2023

Advances in Civil Engineering

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This research was undertaken to predict the result of vault settlement during the excavation of super-large-span tunnels in soft rock strata, which are prone to deformation and hard to predict aftermaths. Numerical simulation was applied to tackle with vault problems during excavation of super-large-span soft rock tunnels such as proneness to deformation and hard prediction on vault settlement. As a result, a model for continuous prediction of vault settlement as the tunnel face keeps advancing was proposed, with influencing factors such as excavation span and tunnel depth taken into consideration, and put forward the optimization of super-large-span variable-section tunnels construction scheme. The results show that the vault settlement becomes fast at the beginning of the excavation because its surrounding rocks are characterized by weakness, incompleteness, and poor stability. At the initial stage of excavation, the varying tunnel depth had a greater impact on vault settlement, indicating that the primary support has to be enhanced at the beginning of the excavation of a vault with weak surrounding rocks. As the excavation of pilot tunnels proceeds, the high-stress zone transfers to the deep part of the surrounding rocks. The tunnel vault settlement model is capable of rapidly predicting the vault settlement at locations other than the observation points. The final settlement amount is affected by the excavation span, the tunnel depth, and the basic mechanical parameters of surrounding rocks. The key to the construction of a super-large-span and variable cross-section tunnel lies in the cross-section varying parts where the stress is concentrated, thus requiring reinforcement and frequent monitoring. The research methods and analysis may provide basic data and technical means for the control of the vault settlement of large-span tunnels in soft rock strata.

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Model test and numerical simulation research on the mechanical response law of lager span and small interval tunnels constructed by CD method

Cited by 21 publications

References 15 publications

Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Optimization Analysis of Partition Wall Support Scheme of Multi-Arch Tunnel

Mechanical Characteristics of Surrounding Rock for Neighborhood Tunnels Using the Schwarz Alternating Method Model: A Case Study

Settlement Prediction Method of Extra-Large Diameter Tunnels in Soft Rock Strata

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