Deformation analysis of underground powerhouse of a large hydropower station based on FLAC3D

Ma, Shugen; Huang, Taosheng; Bao, Xiaojun; Wang, Zhiyuan; Zhang, Haotian; Liu, Gao

doi:10.1088/1755-1315/632/4/042033

Cited by 4 publications

(3 citation statements)

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“…ey are substituted into equation (12) to obtain the equivalent internal friction angle under different slope coefficients, and then, they are substituted into equation (22) to further obtain the equivalent cohesion. Table 2 lists the equivalent strength parameters of different strata dip angles under different slope coefficients, and the shear modulus in the simulation process is taken (Table 3).…”

Section: Parameter Calculationmentioning

confidence: 99%

“…ey found that the horizontal internal extrusion of the surrounding rock was greater than the settlement of the vault, and the lateral wall was largely damaged by horizontal bending and layer separation. Ma [22] modeled the complex curved surface of the underground powerhouse of a hydropower station in western China and simulated it using finite difference software. ey concluded that the deformation and stress of the surrounding rock of the underground powerhouse are small, and the plastic zone has a penetrating trend.…”

Section: Introductionmentioning

confidence: 99%

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Application of the Slope Coefficient of the Equivalent M–C Criterion in Layered Rock Mass Engineering

Liu

Zhang

et al. 2022

Advances in Civil Engineering

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The slope coefficient ω is defined based on the insufficiency of the area equivalent method, the slope of the equivalent M–C criterion obtained from the instantaneous equivalent, and the optimal first-order approximation to reduce the error between the simulated value and the measured value of the surrounding rock and ensure the safety of the project. Different ω conditions are set to obtain multiple equivalent M–C strength parameter combinations. The above combinations are input to the ubiquitous joint model of FLAC3D, and the surrounding rock strength of layered tunnels with different inclination angles (0°, 30°, 45°, 60°, and 90°) is corrected. The results show that (1) after the tunnel excavation is completed, the displacement of key points (e.g., the vault and waist) increases when the slope coefficient is increased and the deviator stress decreases when the slope coefficient is increased. (2) After the area equivalent method is revised, the displacement and the deviator stress are more significantly affected by the inclination of the rock strata than the uncorrected ones, suggesting that the equivalent area can more effectively highlight the anisotropy characteristics of the layered surrounding rock. (3) After the simulation results of the displacement and the deviator stress at the respective key point are comprehensively modified, the optimal slope coefficient corresponding to each rock layer inclination is obtained, and the area is optimized by ensuring reasonableness to reduce the error between the simulated value and the measured value. (4) The layered surrounding rock at a dip angle of 30° is studied. The development of the plastic zone is promoted when the slope coefficient is increased, and the rock shear failure and the joint shear failure occur simultaneously on both sides of its axis.

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Section: Parameter Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of the Slope Coefficient of the Equivalent M–C Criterion in Layered Rock Mass Engineering

Liu

Zhang

et al. 2022

Advances in Civil Engineering

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“…They determined the maximum stress in different directions and pinpointed the location of maximum stress within the hydropower station structure. Ma et al [17] examined the deformation characteristics of the surrounding rock within a subterranean powerhouse and found that the surrounding rock remains stable with low stress and deformation. Elastic cushions have been widely used in water conservancy projects to prevent the spiral case's IWP from being transmitted to the outer concrete and fully leverage the bearing capacity of the metal spiral case.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Joint Bearing Capacity of Composite Cushion-Spiral Case Structures for Hydropower Stations Considering the Damage Mechanisms of Surrounding Concrete

Xu,

Wang,

et al. 2023

Water

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The spiral case structure is an essential part of a hydropower station. To accurately explore the joint load-bearing effect of the cushion-spiral case structure, a cushion-spiral case structure with a high HD value was selected, modeled, and analyzed in this study. The reliability of the model was verified through measured data. Given the contact relation between the spiral case and the cushion, the cushion laying range was used as the control parameter to investigate its impact on the joint bearing capacity of the structure. In addition, the concrete damage theory was introduced to probe the damage mechanism of the structure under assumed extreme working conditions. The steel spiral case bears most of the internal water pressure in the joint bearing system, and the bearing ratio of the surrounding concrete and reinforcement decreases with the increase in the cushion wrap angle. A 1.1–1.2 overload head is the main section that forms penetrating cracks. For the spiral case structure with a high HD value, a reasonable cushion can significantly reduce the damage level of the surrounding concrete and regulate the uneven lifting of the turbine pier and the shear strength of the stay ring. This study can provide reference points for the spiral case arrangement and range and the structural failure response under extreme working conditions.

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Study on the Interaction Mechanism of Segments in the Stratum of TBM Tunnels Undercrossing Existing Buildings

Dapeng,

Ke,

Wenbin

et al. 2024

TOCIEJ

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Introduction Surface settlement caused by tunnel excavation is an inevitable phenomenon in urban subway tunnel construction, which may cause irreversible damage to the ground roads, buildings, etc., if not controlled. Therefore, reasonable prediction and control of surface settlement are essential to ensure the safety and efficiency of tunnel construction. Methods Based on the numerical analysis method, this paper establishes a three-dimensional mechanical calculation model of a TBM tunnel (diameter 6 m) crossing existing buildings (4-story frame structure) and studies the influence law of tunnel excavation on stratum deformation and segment stress. Results The results show that (1) the stress and displacement of the segments vary with the position, and the segments under the building are most affected by the building, whose vertical stress is much greater than the horizontal stress. (2) The vertical displacement of the segments is the largest at the vault and arch bottom and increases with the segments approaching the building, while the horizontal displacement is the largest at the arch waist and shows negative values along the tunnel axis. (3) When the tunnel is excavated to a distance of one tunnel diameter from the building, the building will be affected. If the stratum is unstable, it may cause the collapse of the excavation face or surface settlement, which may result in building inclination, cracking or uneven settlement. Conclusion The research results of this paper can provide a reference for the construction parameter optimization and risk control of TBM tunnel crossing existing buildings.

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Deformation analysis of underground powerhouse of a large hydropower station based on FLAC3D

Cited by 4 publications

References 0 publications

Application of the Slope Coefficient of the Equivalent M–C Criterion in Layered Rock Mass Engineering

Application of the Slope Coefficient of the Equivalent M–C Criterion in Layered Rock Mass Engineering

Analysis of the Joint Bearing Capacity of Composite Cushion-Spiral Case Structures for Hydropower Stations Considering the Damage Mechanisms of Surrounding Concrete

Study on the Interaction Mechanism of Segments in the Stratum of TBM Tunnels Undercrossing Existing Buildings

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