Dynamic Response of Curved Wall LTSLS Under the Interaction of Rainwater Seepage and Earthquake

Cheng, Xuansheng; Feng, Huan; Qi, Shangrong; Zhang, Xiaoyan; Liu, Bo

doi:10.1007/s10706-016-0148-x

Cited by 11 publications

(3 citation statements)

References 6 publications

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“…Most loess tunnels are subject to waterfall erosion, lateral erosion, and headward erosion [22,23] due to surface water infiltration or groundwater erosion during the construction process, which in turn results in the reduction in the strength of the surrounding rock [24,25], large deformations, and wet subsidence of the loess [26][27][28]; therefore, the mechanism of structural failure in loess tunnels under different water contents is the focus of research. In addition, in groundwater flow simulation, the input parameters are Water 2024, 16, 581 2 of 16 uncertain [29] and certain methods are needed to predict the parameters [30].…”

Section: Introductionmentioning

confidence: 99%

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Deng,

Zhang,

et al. 2024

Water

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The high water content of the surrounding rock in loess tunnels will lead to the deterioration of rock strength, causing deformation and damage to the initial support structure and thereby affecting safety during construction and operation. This article first analyzes the strength characteristics of loess under different water contents through indoor physical and mechanical tests. Secondly, based on numerical simulation results, the ecological environment, and design requirements, the water content threshold is determined. Finally, a reinforcement scheme combining surface precipitation measures and curtain grouting measures is proposed, and the reinforcement effect is analyzed based on on-site monitoring data. The results show that as the water content of loess increases, the cohesion, internal friction angle, and elastic modulus of the surrounding rock all decrease, leading to an increase in the sensitivity of the surrounding rock to excavation disturbances and a deterioration in strength. During the construction process, it shows an increase in the vault settlement and sidewalls’ convergence. During the process of increasing the distance between the monitoring section and the palm face, the settlement and convergence of the tunnel show a rapid growth stage, slow growth stage, and stable stage. The water content threshold is determined to be 22%. The reinforcement scheme of combining surface precipitation measures with curtain grouting measures not only meets the requirements of the ecological environment but also makes the settlement and convergence values lower than the yellow warning deformation values required by the design.

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Section: Introductionmentioning

confidence: 99%

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Deng,

Zhang,

et al. 2024

Water

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“…Qiu, J. et al (2022) used a comprehensive method combining theoretical derivation and numerical simulation to study the response mechanism of loess subway tunnels under partial water environments [2]. Cheng, X. et al (2017) studied the influence of seepage on the seismic response of loess tunnels using ADINA to simulate the structural field and fluid field, compared and analyzed the maximum principal stress, minimum principal stress, lining maximum displacement, and internal forces of the tunnel structure, and further obtained the influence of rainwater seepage on the mechanical properties of LTSLS [3]. Weng, X. et al (2021) used numerical simulations to study the effects of different flooding methods on tunnel linings and further studied the stress and deformation of tunnel linings, strata, and surface subsidence after local soil collapse in the tunnel, as well as the mechanical mechanisms causing these effects [4].…”

Section: Introductionmentioning

confidence: 99%

Research on the Experimental System of Reinforcing the Base of Shallow Buried and Wet Collapsible Loess Tunnels

Zhao

et al. 2023

Buildings

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Due to the complexity of the surrounding rock structure and the geological environment of tunnel excavations, traditional analytical methods are insufficient in effectively dealing with the complex nonlinear deformation problems arising from tunnel excavation. In contrast, geomechanical model tests can comprehensively simulate the excavation construction process of tunnels and the mode and time effects of loads, providing a more realistic reflection of the complete process of engineering stress and deformation. Therefore, this study conducted a model test on reinforcing the loess tunnel base, building upon the first tunnel of the Lanqing Expressway located on the north bank of the Yellow River in Lanzhou City. The study utilized similarity theory to explore the theoretical design of the model and established a specialized model test platform to design the experiments with the goal of obtaining more scientific and effective experimental schemes to ensure the safety of soil reinforcement in tunnel bases during construction. This research will contribute to improving the safety, reliability, and economy of loess tunnel base reinforcement projects, and has a certain reference value for research in this field.

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“…Using the Xiamen Subsea Tunnel as an example, Li et al [15] analyzed the stability of the tunnel under fluidsolid coupling by using the FEM. Using the ADINA simulation structure and the fluid field, Cheng et al [16] established a calculation model of a curved wall loess tunnel with a superlarge section (LTSLS). Wang et al [17] tested the relationship between the critical groundwater seepage velocity and the subsurface erosion using self-made instruments.…”

Section: Introductionmentioning

confidence: 99%

Seismic Stability of Loess Tunnel with Rainfall Seepage

Cheng

Zhang

Fan

et al. 2020

Advances in Civil Engineering

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Rainfall seepage changes the mechanical properties of loess masses. Considering fluid-solid coupling, the calculation model of a loess tunnel is established according to the finite element method (FEM). Based on porous media seepage theory and rainfall infiltration depth theory and considering the infiltrated depth of the loess surface for different rainfall intensities over a certain period, the stability of a loess tunnel under different rainfall amounts and loess cover thicknesses is studied using the dynamic finite element static strength reduction method. The results show that under the same rainfall intensity, the safety factor increases with the depth of the tunnel; the safety factor of the loess tunnel with the same loess cover thickness decreases with increasing infiltration depth. The plastic strain is mainly distributed on both sides of the vault and the arch feet. The stability of the loess tunnel is directly related to the loess cover thickness and rainfall seepage.

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Dynamic Response of Curved Wall LTSLS Under the Interaction of Rainwater Seepage and Earthquake

Cited by 11 publications

References 6 publications

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Research on the Experimental System of Reinforcing the Base of Shallow Buried and Wet Collapsible Loess Tunnels

Seismic Stability of Loess Tunnel with Rainfall Seepage

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