The evaluation on shock absorption performance of buffer layer around the cross section of tunnel lining

Xin, Chunlei; Wang, Z.Z.; Yu, Juanjuan

doi:10.1016/j.soildyn.2020.106032

Cited by 32 publications

(12 citation statements)

References 30 publications

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“…representing. e geometric and mechanical parameters simultaneously determine the seismic absorption performances of buffer layer [14]. In addition, the low-frequency seismic waves have the significant influence on the underground structure [37].…”

Section: Numerical Examples and Analysis Resultsmentioning

confidence: 99%

“…e buffer layer is much softer than the surrounding rock and lining; thus, the interaction between the lining and surrounding rock could be improved [12,13]. Compared with antiseismic measures, it is simple and effective to adopt buffer layers [14]. Surely, antiseismic measures and shock absorption measures can both be adopted in the seismic design of tunnels, under some special adverse geological conditions [15].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Response of Composite Lining Tunnel with Buffer Layer: An Analytical and Experimental Investigation

Fan

Shen

Wang

et al. 2020

Mathematical Problems in Engineering

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Composite lining is often designed for the mountainous tunnels in high-intensity earthquake areas. The application of the buffer layer will bring more advantages, while the shock-absorbing mechanism is still unclear currently. In this paper, based on the Fourier-Bessel series expansion method, the dynamic stress concentration factor of composite lining tunnel with buffer layer subjected to plane SV waves in the half-space is obtained. Then, the influence of geometric and mechanical parameters of the buffer layer on composite lining was systematically analyzed. Finally, the correctness of the analytical solutions is verified by series shaking table tests and numerical simulations. Results suggest that the buffer layer can play the role of “redistributing” the seismic load, and it can effectively reduce the dynamic responses of secondary lining but amplify in primary support. There is an optimal interval of the stiffness and thickness for the buffer layer. When the stiffness ratio of the buffer layer to surrounding rock is 1/10 ∼ 1/50 or the ratio of buffer layer thickness to inner diameters of secondary lining is 1/40 ∼ 1/20, the shock-absorbing performance is remarkable. The general damage observations in tests show that the crown, arch springing, and invert of composite lining in case of no buffer layer are prone to cracking under a strong earthquake. The invert of the composite lining is more susceptible to be damaged after adopting the buffer layer. In general, the analytical results were consistent with experimental and numerical results. The above study results may provide theoretical support and experimental data for the seismic design of composite lining tunnels.

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Section: Numerical Examples and Analysis Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Composite Lining Tunnel with Buffer Layer: An Analytical and Experimental Investigation

Fan

Shen

Wang

et al. 2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…e first aspect is the collection, analysis, and inversion of seismic damage data. Much work has been done in this aspect to research the damage mechanism of tunnels [1][2][3][4]. e second aspect is the experimental researches on tunnel models.…”

Section: Introductionmentioning

confidence: 99%

Seismic Damage Prediction Method for Lining Structures Based on the SEDR Principle

Zheng

Xin

Shen

et al. 2021

Shock and Vibration

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The safety and stability of lining structures are core concerns of tunnel and underground engineering. It is crucial to determine whether a lining structure would crack and which direction the crack would expand with seismic excitation. In previous literature, the principle based on stress and strain has been widely used to predict the seismic damage of lining structures, whereas it cannot specify the cracking modes. Taking account of that deficiency, this paper introduces the strain energy density ratio (SEDR) principle and proposes a seismic damage prediction method for lining structures, which can precisely predict the crack positions and expansion directions. Moreover, numerical simulations of the typical seismic damage sections of two tunnels in the Great Wenchuan Earthquake and a calculating example of the theoretical equations are conducted to verify the proposed method. In summary, the numerical simulation results show that the arch springing cracks first, and the invert cracks next; then the cracks expand to the spandrel, and finally, they form oblique cracks, annular cracks, and longitudinal cracks, whose positions and patterns are in accordance with the field investigation results. In terms of the calculating example results, the obtained two-fold SEDR and cracking angle θ are 1.87 and −6.28°, respectively, which are consistent with the numerical simulation results. Therefore, one can see that the proposed seismic damage prediction method based on the SEDR principle is quite accurate. This method can be used to predict the seismic damage of lining structures and provide a reference for the research of the damage mechanism of tunnels.

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“…Generally, the isolation layer is the most simple and effective method; that is, a layer of flexible material is employed between the rock and linings to minimize the seismic motion from the linings [11,12]. e application of the isolation layer changes the rock-lining system into the rock-layer-lining system [13].…”

Section: Introductionmentioning

confidence: 99%

Structure Strengthening Method for Enhancing Seismic Behavior of Soft Tunnel Portal Section

Cui

2021

Mathematical Problems in Engineering

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Tunnel portal sections always suffer serious damage under strong earthquakes. This paper aims to study the seismic performance of lining strengthening method in soft rock portal section by employing the model test. Firstly, the shaking table test considering the test cases, the modified input motions, the boundary condition, and monitoring equipment are conducted to simulate the seismic response of the soft tunnel portal section. Then, the lining strengthening method of increasing concrete grade is applied to the tunnel structure to study the aseismic performance of the soft rock tunnel portal section, and the seismic effects of the tunnel linings with different concrete grades are compared and analyzed. The result shows that the proportion of soft rock to total surrounding rock is the key factor affecting the seismic response of soft rock tunnel portal section; the larger the proportion of soft rock in surrounding rock, the more vulnerable the structure to earthquake damage; the seismic performance of the lining strengthening in hard rock portal is remarkable while limited in soft rock portal section. The stiffness and strength of the lining are larger than those of surrounding rock; the seismic performance of the soft portal section could hardly be improved only by the lining strengthening method. It is suggested to adopt both the structure strengthening and isolation method in the seismic design of soft portal section.

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The evaluation on shock absorption performance of buffer layer around the cross section of tunnel lining

Cited by 32 publications

References 30 publications

Dynamic Response of Composite Lining Tunnel with Buffer Layer: An Analytical and Experimental Investigation

Dynamic Response of Composite Lining Tunnel with Buffer Layer: An Analytical and Experimental Investigation

Seismic Damage Prediction Method for Lining Structures Based on the SEDR Principle

Structure Strengthening Method for Enhancing Seismic Behavior of Soft Tunnel Portal Section

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