Large deformation characteristics and treatment effect for deep bias tunnel in broken phyllite: A case study

Wu, Hao; Fan, Fei; Yang, Xiaohua; Wang, Zhichao; Lai, Jinxing; Xie, Yingchao

doi:10.1016/j.engfailanal.2022.106045

Cited by 45 publications

(9 citation statements)

References 69 publications

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“…Many experts and scholars have achieved certain research results on the field application and engineering effects of double or multi-layer primary support structures in soft rock tunnels [9][10][11][12][13][14][15][16]. However, many studies mainly rely on field tests with high cost.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies mainly evaluate and determine the safety and stability of the structure from the perspectives of surrounding rock pressure, support structure stress, etc. Due to limited field engineering conditions, the amount of field test data is limited and the research scope involved is relatively limited [9,17,18]. The numerical calculation model derived from field tests can overcome the research difficulties of single field test conditions and the difficulty in obtaining refined structural data [5,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

Chen,

Ding,

Liu

et al. 2024

Period. Polytech. Civil Eng.

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Based on a soft rock tunnel in a mountainous area of northwest Yunnan Province, a refined numerical model of different support forms considering structural interaction is established to comprehensively evaluate the structural failure mechanisms and mechanical responses of different support forms. Research shows that compared to steel rib structures, the axial force and bending moment of sprayed concrete structures is larger under different combinations of support structures. Compared with a single-layer support structure, the stress distribution at each position of the double-layer I-shaped steel structure is more uniform, and the sprayed concrete structure only experiences compression damage at the corner of the side wall. As the strength of sprayed concrete increases, the stress distribution of sprayed concrete at the arch waist becomes more uniform. The stress concentration state of sprayed concrete at the corner of the tunnel wall and the plastic yield state of the steel rib structure have also been improved. The higher the concrete strength, the lower the stress ratio on the steel rib’s inner and outer sides.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

Chen,

Ding,

Liu

et al. 2024

Period. Polytech. Civil Eng.

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“…In addition, the layered surrounding rocks are characterized by laminations and deformation anisotropy, which render the tunnels traversing this stratigraphic environment highly susceptible to large deformation hazards. The main disasters include primary support cracking [4,5], arch distortion [6,7], and collapse [8,9], all of which significantly threaten the safety of construction personnel and mechanical equipment. Therefore, it is necessary to better understand the stress characteristics of tunnel support in areas comprising layered surrounding rock with high ground stress.…”

Section: Introductionmentioning

confidence: 99%

“…Guo et al [28] confirmed that a two-step method incorporating an inverted arch can effectively mitigate the deformation of steeply inclined layered surrounding rock tunnels based on field test methods. Wu et al [5] found that the distribution of surrounding rock pressure in phyllite surrounding rock tunnels was uneven, and the primary support and secondary lining were mainly subjected to compressive stress.…”

Section: Introductionmentioning

confidence: 99%

A Field Study to Measure the Surrounding Stress of Rock and Supporting Structure of a Steep Tunnel with a Combination of Hard and Soft Rock Layers under Plate Compression

Zhang,

Hu,

et al. 2024

Buildings

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Tunnels excavated in a combination of hard and soft rock strata with high ground stress are prone to large deformations, collapse, and other disasters. The Yongfeng Tunnel, a reconstruction and expansion of the G544 line, suffered severe high ground stress from plate compression. This paper studied the surrounding rock pressure and supporting structure stress characteristics of tunnels with a combination of hard and soft rock strata with high ground stress by using earth pressure cells, surface strain gauges, and embedded strain gauges to test all stress related to the surrounding rock, primary support, and secondary lining. It was found that the contact pressure (P1) between the initial support and the surrounding rock and the contact pressure (P2) between the initial support of the leading tunnel were distributed in the direction of vertical stratification, while the contact pressures (P1 and P2) of the lagging tunnel were different due to the excavation unloading of the leading tunnel. The maximum stress positions of the initial support of the leading tunnel and the lagging tunnel were located in the left arch waist and the vault, respectively. However, the maximum stress position of the secondary lining was generally located on the side wall. The research results presented herein can guide future tunnel construction projects.

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“…These measures will increase the construction process and project cost, and extend the construction time to varying degrees. Large deformations of the tunnel surrounding rock are related to engineering geology, groundwater, in-situ stress, and construction methods [10]. Based on the variation law of the deformation of tunnel surrounding rock with time, the specific deformation characteristics of tunnel surrounding rock are obtained.…”

Section: Introductionmentioning

confidence: 99%

Prevention of Large Deformation of Soft Surrounding Rock in Tunnel Construction

Suo¹,

Gao²,

Hu³

et al. 2023

J. meas. eng.

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Large deformation of surrounding rock makes the internal space of a tunnel cannot meet the requirements of normal use after support, even leads to the instability of surrounding rock and destruction of the tunnel structure. In order to optimize the parameters of the primary support to control the deformation of surrounding rock, field tests and numerical simulations are carried out. Based on the engineering geological conditions and the deformation monitoring data of surrounding rock, four important creep parameters of the improved Burgers model are inversed by numerical simulation, considering the creep of surrounding rock in tunnel construction. The results show that it is feasible to use tunnel crown settlement as a control indicator to determine the thickness of shotcrete. Short rock bolts are preferentially used in the tunnel arches, and a combination of long and short rock bolts should be used on the sidewall to control the large deformation of surrounding rock. When the excavation method of upper-lower bench is used in the single-track railway with a relatively large high-span ratio, the horizontal convergence monitoring points of the upper bench are recommended to be set 0.8-0.9 times the height of the upper bench from the tunnel arch crown, and those of the lower bench are recommended to be set 0.6-0.7 times the total height of the upper-lower bench from the tunnel arch crown.

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Large deformation characteristics and treatment effect for deep bias tunnel in broken phyllite: A case study

Cited by 45 publications

References 69 publications

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

Failure Mechanism and Structural Safety Assessment of the Primary Support Structure of Soft Rock Tunnel: A Case Study

A Field Study to Measure the Surrounding Stress of Rock and Supporting Structure of a Steep Tunnel with a Combination of Hard and Soft Rock Layers under Plate Compression

Prevention of Large Deformation of Soft Surrounding Rock in Tunnel Construction

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