Investigation on seepage field distribution and structural safety performance of small interval tunnel in water-rich region

Chen, Ziquan; Li, Zheng; He, Chuan; Ma, Chunchi; Li, Xiang; Chen, Kunping; Zhang, Hang; Liu, Maoyi

doi:10.1016/j.tust.2023.105172

Cited by 15 publications

(3 citation statements)

References 38 publications

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“…When the groundwater level declined below the ecological water level, the water supply for plant growth in the tunnel site would be limited, and the ecological environment of the tunnel site would deteriorate [7,8]. However, most of the current researches on tunnel drainage are focused on the seepage field variation [9][10][11], surrounding rock stability [12][13][14], drainage system [15,16], and tunnel structure safety [17][18][19], but few studies on tunnel drainage are conducted from the perspective of plants ecological protection. Therefore, evaluating the effect of groundwater level decline induced by tunnel excavation on plants in the tunnel site and calculating the ecological water level are of great significance for intelligent control of tunnel drainage and environmental monitoring during tunnel construction and operation.…”

Section: Introductionmentioning

confidence: 99%

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Liu,

Zhuang,

Zhou

et al. 2024

Journal of Intelligent Construction

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Keywordsgroundwater decline ecological water level SPAC model plant wiltDuring the excavation of tunnels in mountainous areas, groundwater may be lost, which affects the surface plants and ecology. In this article, taking Hengwu Tunnel in China as an example, based on the soil-plant-atmosphere continuum (SPAC) model, the relevant parameters were obtained by field test first, and then from the perspective of soil water matrix potential (SWMP) and soil water migration (SWM), the effect of groundwater level decline induced by mountain tunnel excavation on plant growth was studied, and the calculation method of ecological water level was put forward. The results show the following: (1) The wilting of plant roots is a dynamic process of gradual expansion from the middle of the root to both ends, and the response of SWMP in the root region to changes in atmosphere and groundwater level is lagging and non-uniform; (2) SWMP can be used to predict the degree of wilting of plant roots, while the final distribution and value of SWMP are only related to the position of the groundwater level, but not related to the decline rate of the groundwater level; (3) groundwater level and rainfall (P) will affect the value and proportion of each flux in the SPAC model, in which the relative transpiration ratio can be used to evaluate the growth of the plant and calculate the ecological water level of the plant.

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Section: Introductionmentioning

confidence: 99%

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Liu,

Zhuang,

Zhou

et al. 2024

Journal of Intelligent Construction

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“…Mei et al [9] analyzed the impact of shield tunnels crossing water-rich sand layers on land subsidence through experimental studies and proposed a construction control method. Chen et al [10] conducted experiments on tunnels under varying hydrostatic pressures to examine the complex interaction between the seepage field and the stress field in water-rich areas. Through centrifuge model tests, Weng et al [11] determined that, under isotropic permeability conditions, the internal friction angle of the soil is the primary factor influencing the stability of the excavation face with varying longitudinal slope angles.…”

Section: Introductionmentioning

confidence: 99%

Disturbance characteristics test about double-line shield tunnel excavation in grouting-reinforced water-rich sand stratum

Liu,

Cheng,

Sun

et al. 2024

Eng. Res. Express

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To study the disturbance characteristics of double-line shield tunnel excavation on sand bodies in grouting-reinforced water-rich sand stratum, a similar model test was carried out. Firstly, the physical parameters and strength indexes of the overlying soil strata of the tunnel in the water-rich sand stratum were determined by laboratory tests. The similar soil and tunnel support structures of each stratum were prepared. Then, considering the different seepage modes of upper and lower soil strata under the influence range of tunnel excavation, the model test of double-line shield tunnel excavation in a grouting-reinforced water-rich sand stratum is conducted. The variation rules of sand deformation, surface settlement, and sand body stress during the excavation of a double-line shield tunnel are analyzed utilizing monitoring and analyzing systems such as a flowmeter, micro earth pressure sensors, and dial indicators. It is found that during the excavation of the double-line tunnel, the self-stabilization ability of the grouting reinforced sand bodies is strong under the action of stable seepage. Under the influence of grouting reinforcement, the seepage path around the tunnel structure will change, the fluid-solid coupling effect will decrease, and the sand stratum will be uplifted to varying degrees. The sand body will change its mechanical properties due to the influence of seepage. The fluid-solid interaction effect will be enhanced. The fluid-solid coupling effect of soil particles and water will be further enhanced when the excavation of the subsequent tunnel is carried out. The effect of unsaturated seepage in the overlying soil stratum leads to greater stress at the arch waist of the arch tunnel. In the actual construction process, the grouting amount and grouting time should be strictly controlled. The tunnel basement is supported by anchor spray support to prevent the tunnel structure and surface uplift.

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“…He et al [13] developed equipment to simulate external water pressure on the lining of a horseshoe tunnel and combined it with a finite-element numerical model to validate the proposed method through comparing relevant bending moments, thrust, and shear forces. Chen et al [14] conducted experiments on tunnels under different static water head heights using a self-developed seepage model testing device and studied the distribution of seepage fields in small spacing tunnels in water-rich areas and its impact on structural mechanical behavior. Wu et al [15] studied the long-term stress and structural deformation characteristics of water-rich loess tunnels through numerical simulation and field monitoring.…”

Section: Introductionmentioning

confidence: 99%

The Optimization of Waterproof and Drainage Design and an Evaluation of the Structural Safety of Tunnels in Weak Watery Strata

Zhou,

Zhu,

Zheng

et al. 2023

Buildings

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The surrounding rock and high water pressure in weak watery strata have adverse effects on the mechanical properties of tunnel support structures. In order to optimize the anti-drainage design of tunnels in weak watery strata and evaluate their structural safety, this paper relies on the Taidacun Tunnel of the China–Laos Railway to carry out field monitoring research. A dual-field fluid–solid coupling calculation model is established to optimize the tunnel’s waterproof and drainage design, combined with a bending moment curvature model to evaluate structural safety. The main conclusions are as follows: Under the action of high water and soil pressure, the structural safety margin of the water-rich fine sand section of the Taidacun Tunnel is small, and waterproof and drainage design optimization is required. Combined with the proposed average pressure reduction coefficient, the influence of the water level and annular blind pipe spacing on the water pressure of the lining is proved, and then the optimal annular blind pipe spacing in the water-rich area of the tunnel is determined. A structural safety evaluation method based on the bending moment curvature model is proposed. Two models of elastic beam and moment–curvature beam are used to analyze the mechanical characteristics and optimization effects of the structure under optimal annular blind pipe spacing.

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Investigation on seepage field distribution and structural safety performance of small interval tunnel in water-rich region

Cited by 15 publications

References 38 publications

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Effect of groundwater decline on plant induced by tunnel excavation and calculation of ecological water level based on SPAC model

Disturbance characteristics test about double-line shield tunnel excavation in grouting-reinforced water-rich sand stratum

The Optimization of Waterproof and Drainage Design and an Evaluation of the Structural Safety of Tunnels in Weak Watery Strata

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