Evaluation of groundwater effects on tunnel engineering in loess

Sun, Wen; Liang, Qingzhong; Qin, Suhua; Yuan, Yongxin; Zhang, Tangjie

doi:10.1007/s10064-020-02095-0

Cited by 28 publications

(6 citation statements)

References 7 publications

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“…The disintegration of loess is one of the main factors causing extreme deformation. The strength and mechanical properties of loess are especially affected by water (Xu et al 2020;Sun et al 2021). In the water-rich environment, the collapsibility of loess is relatively weak, mainly manifested as disintegration (Zhang et al 2015).…”

Section: Disintegrationmentioning

confidence: 99%

Deformation failure characteristics and control measures of a shallow loess tunnel in water-rich strata

Lei

Tang

Zhao

et al. 2023

Preprint

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With the acceleration of tunnel construction, it is inevitable to cross the collapsible loess region. The engineering properties of loess are very poor in the water-rich environment. Additionally, if the buried depth is shallow, the load bearing capacity is further weakened, which can increase the difficulty of tunnel construction. Therefore, this paper provides a case study on the Pangwan Tunnel based on a geological survey, numerical simulation, and on-site monitoring. The failure characteristics of the studied area under the original support scheme are analyzed in detail, and the extreme deformation mechanism is discussed combining the geological conditions and surrounding rock properties. The results show that there are five main reasons resulting in the extreme deformation of the Pangwan Tunnel, which are: abundant groundwater, low strength of surrounding rock, disintegration of loess after water immersion, depth of tunnel is shallow, and unreasonable original support scheme with low bearing capacity. Then, the corresponding countermeasures are proposed, which are advance drainage, large arch foot and foot-lock bolt, sealing tunnel face and grouting timely, as well as advance pipe shed and small pipe grouting. Finally, from the feedbacks of numerical analysis and field application results, extreme deformation of the Pangwan Tunnel is effectively controlled. This work can provide some helpful guidance for similar projects.

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Section: Disintegrationmentioning

confidence: 99%

Deformation failure characteristics and control measures of a shallow loess tunnel in water-rich strata

Lei

Tang

Zhao

et al. 2023

Preprint

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show abstract

“…In low-lying and flat regions, sustained or sudden heavy rainfall can lead to waterlogging resulting from inadequate drainage [2], potentially causing rapid alterations in subsurface groundwater levels and flow regimes. This may result in a weakening of the soil strength [3] and internal erosion within the soil layers, ultimately affecting the operational safety of urban underground infrastructure. The sediment in aquifers includes cohesive and noncohesive alluvial soils.…”

Section: Introductionmentioning

confidence: 99%

Obliquely incident seismic response of subway stations following urban soil internal erosion

Wei,

Wang,

Liang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Urban groundwater infiltration resulting from tropical storm rainfall can lead to internal soil erosion and ground subsidence. The long-term effects of these phenomena may result in uneven settlement of the subway system, posing risks to its safety and operational integrity. Suffusion poses a significant hazard to long-term subway operation. It is a type of soil internal erosion characterized by the migration of fine particles from the pore channels between coarse particles. This study focused on the performance degradation of different gap-graded sands caused by internal erosion, observed through triaxial compression tests. Using the cap plasticity model and considering mechanical parameters before and after soil erosion, a refined two-dimensional finite element model of a soil subway station structure based on ABAQUS was developed to analyze the deformation and damage pattern of the subway structure resulting from soil internal erosion and earthquake. The results of this study demonstrated that localized internal soil erosion significantly contributes to uneven settlement in subway stations, potentially compromising their seismic performance during oblique seismic excitations.

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“…Many researchers have investigated and analyzed this phenomenon and found that there are many reasons for early damage in civil air defense engineering, among which some of the principal reasons are seepage and cyclic loads [20][21][22][23]. The current research mainly focuses on seepage and traffic loads and roads, as well as the effect of speed on road surfaces [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Seepage–Cyclic Load Coupling Disturbance on the Physical Field in Old Urban Underground Spaces

Yang,

Cheng,

Cui

et al. 2024

Sustainability

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The safety and sustainability of urban underground spaces have become crucial considerations in development projects. Seepage and cyclic loads are the principal reasons for the instability and failure of old underground space structures. This study investigates the variations in physical fields of underground spaces in cities under the coupling disturbance of seepage and cyclic loads, focusing on underground civil air defense engineering in Beijing as a case study. Different seepage conditions and the effects of seepage–cyclic load coupling were simulated using the numerical calculation software Plaxis 3D V20. The results show that change in groundwater can affect the deformation of underground space, and the severity is related to the quantity and intersection state of tunnels, the location of rivers above, and the strength of materials. The coupling effect of seepage–cyclic load on urban underground space structures is more serious than that of a single percolation. Decrease in material strength and high traffic loads are the principal reasons for the failure of underground structures. A 30% decrease in material strength causes the displacement to increase almost 1.5 times, and maximum displacement under different traffic loads can vary by 3 times. This study holds significant implications for the design, maintenance, and engineering management of underground spaces, emphasizing the importance of sustainable practices in urban development and infrastructure.

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Evaluation of groundwater effects on tunnel engineering in loess

Cited by 28 publications

References 7 publications

Deformation failure characteristics and control measures of a shallow loess tunnel in water-rich strata

Deformation failure characteristics and control measures of a shallow loess tunnel in water-rich strata

Obliquely incident seismic response of subway stations following urban soil internal erosion

Study of the Effect of Seepage–Cyclic Load Coupling Disturbance on the Physical Field in Old Urban Underground Spaces

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