Elastic solutions for circular tunnel with void behind lining

Yasuda, Naotoshi; Tsukada, Kazuhiko; Asakura, Toshihiro

doi:10.1016/j.tust.2017.08.032

Cited by 63 publications

(18 citation statements)

References 4 publications

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“…Most studies on the effects of local voids or contact loss between the lining and the soils on a single tunnel have been presented in terms of field investigation [8], theoretical analysis [9], model tests [10], and numerical analysis [11]. Voids can induce the concentrated load to the double-arch tunnel lining and loosening of the soils, with associated shortage of carrying capacity and even damage.…”

Section: Introductionmentioning

confidence: 99%

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Min

et al. 2019

Symmetry

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The presence of voids behind lining seriously affects the safety of the symmetrical double-arch tunnels during service life. It is essential to find out the impact of voids on tunnel safety due to the increasing demand for the construction and maintenance of symmetrical double-arch tunnels. Model tests and numerical analyses were conducted in this research. The results attained were explored including earth pressure, internal force, and lining failure. Results reveal that the presence of voids has a large influence on the internal force in the lining of symmetrical double-arch tunnels, generally in the form of asymmetrical failure patterns of the lining. The failure patterns of the lining are greatly influenced by the size and location of voids with respect to the symmetrical double-arch tunnel circumference. Significant changes in the lining internal forces were found at the areas in the close vicinity of the void whereas a few changes were found at the bottom of the sidewall, the invert, and the central wall far away from the void. The propagation laws of lining cracks of asymmetrical double-arch tunnels are more complicated than symmetrical tunnels with a void behind the central wall. The location of the initial cracking of symmetrical and asymmetrical double-arch tunnels is the same, while the lining failure of the large-section tunnel is the most complicated.

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Section: Introductionmentioning

confidence: 99%

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Min

et al. 2019

Symmetry

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“…At present, some research work has been carried out on the influence of existing defects, such as voids behind the lining and insufficient thickness, by means of statistics, theoretical analysis, numerical calculation, and laboratory tests, from which a lot of achievements have been gained [7][8][9][10][11][12][13][14][15]. It is found that voids behind the lining will cause stress redistribution of surrounding rock and then change the stress state of lining [7,8]. e influence of different positions of voids on the stress state, failure mode, and safety factor of the lining structure varies [9].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the existing experimental and computational studies mostly focus on the single defect, and there is little research on the bearing capacity of lining under the influence of the combination of two defects [14]. In addition, the small-scale model test [8,15,18] has been used in the existing experimental studies, which makes it difficult to solve the problem of material similarity. erefore, this paper uses the 1/5 scale lining model test and numerical simulation method to study the mechanical behavior of lining under voids behind the lining, insufficient thickness of the lining, and the combination of two kinds of defects.…”

Section: Introductionmentioning

confidence: 99%

Influence of Existing Defects on Mechanical Properties of NC Lining

Zhang

Ren

Ding

et al. 2019

Advances in Materials Science and Engineering

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The mechanical properties of the lining are directly affected by defects such as voids behind the lining and insufficient thickness of the lining. In order to quantitatively evaluate this effect, the mechanical behavior of the lining under the influence of the void behind the lining, the insufficient thickness of the lining, and the combination of the two kinds of defects are adopted by the 1/5 scale model test. Based on the experimental research, numerical calculation models based on the CDP model for defect lining are established, with the effects of load direction, stratum stiffness, defect location, defect type, and degree on the mechanical behavior of the lining analyzed by the numerical simulation. The experimental and numerical results show that the void weakens the stiffness of the lining. As the void range increases, the lining becomes more deformable and its bearing capacity decreases with the “S” curve. Thinning significantly reduces the deformation properties of the lining and the bearing capacity and stiffness of the thinned section. The lining bearing capacity decreases linearly with the increase of the thinning ratio, when the load is applied at the thinning. With the influence of combined defects on the load-displacement curve of the lining fluctuating drastically, the mechanical properties of the lining are significantly reduced. The bearing capacity of lining decreases with the increase of composite defects in a “S” shape. The effect of void and lining thinning on the lining bearing capacity increases with the increase of the stiffness of the formation. The loss rate equation of the concrete lining bearing capacity under the influence of existing defects is established by using the L-M nonlinear regression analysis, a provision of scientific guidance for the safety evaluation of the defect lining.

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“…The voids cause the earth pressure redistribution on existing tunnel linings, which in turn changes the internal force state of the tunnel linings [13]. Stress concentration tends to occur at the edge of the voids, causes structural crack, leads to other diseases, and weakens the lining near the voids [14]. The location and range of voids considerably affect the internal force distribution of the lining [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Symmetric and Asymmetric Voids on Mechanical Behaviors of Tunnel Linings: Model Tests and Numerical Simulations

Ding

et al. 2019

Symmetry

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The presence of symmetric and asymmetric voids directly affects the mechanical behaviors of tunnel linings and further induces tunnel diseases among influence factors. In this paper, 1:5-scale model tests were carried out to study the mechanical behaviors of reinforced concrete (RC) linings considering the voids located at the crown and at the spandrel. Based on the experimental results and concrete plastic damage (CDP) model, the effects of void (i.e., location and size), subgrade stiffness, and lining size on bearing capacity of RC lining were investigated using numerical simulation. The results of model test and parametric analysis showed that the existence of voids significantly affected the mechanical behavior of the lining during inelastic deformation period. The lining with a larger void size corresponded to low bearing capacity and larger deformation around the void, thus increasing the damage possibility of linings. The influence of voids on the bearing capacity of linings varied with the void location, load direction (especially under horizontal symmetrical loads), and subgrade stiffness. High soil stiffness corresponded to a great influence of the void size on the lining bearing capacity. In addition, the lining strength increased inconsistently with the increase of model size. On the basis of parameter sensitivity analysis, the Levenberg–Marquardt (L-M) optimization algorithm and Logistic model were used to establish the equation of lining bearing capacity loss rate considering the void effect.

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Elastic solutions for circular tunnel with void behind lining

Cited by 63 publications

References 4 publications

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Effect of Voids Behind Lining on the Failure Behavior of Symmetrical Double-Arch Tunnels

Influence of Existing Defects on Mechanical Properties of NC Lining

Influence of Symmetric and Asymmetric Voids on Mechanical Behaviors of Tunnel Linings: Model Tests and Numerical Simulations

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