Shaking table test on flexible joints of mountain tunnels passing through normal fault

Shen, Yu-Sheng; Wang, Z.Z.; Yu, Juanjuan; Zhang, X.; Gao, Bo

doi:10.1016/j.tust.2020.103299

Cited by 80 publications

(33 citation statements)

References 23 publications

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“…Most of the equipment in civil engineering laboratories is relatively large. For example, the size of the general shaking table is 8 m × 10 m [ 77 ], and the size of a galvanized steel tank for model pile test is 975 mm × 695 mm × 680 mm [ 78 ]. For other instrument-related or chemical laboratories, the equipment is rarely used and the volume is much smaller.…”

Section: Discussionmentioning

confidence: 99%

Assessing the Safety Risks of Civil Engineering Laboratories Based on Lab Criticity Index: A Case Study in Jiangsu Province

Zhang

Peng

et al. 2020

IJERPH

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With the rapid development of the construction industry, an increasing amount of attention were paid by universities to the development of civil engineering experiment courses so as to improve the practical research abilities of students. In recent years, due to the frequent occurrence of civil engineering laboratory accidents, it has become an urgent issue regarding on what factors influencing safety risks and how to assess and reduce the safety risks in civil engineering laboratories. Based on the lab criticity index (LCI) model, the research specificities of civil engineering laboratories were analyzed through literature review and expert interviews and 13 risk factors of civil engineering laboratories, from the four aspects of man, object, management, and environment, identified. The data for each parameter in the LCI model was obtained through a questionnaire survey, and finally the LCI value was calculated to evaluate priority. Among them, insufficient safety awareness of operators, danger due to equipment failure, imperfect management policies, and complex floor conditions were listed as the most common risk factors. Based on the LCI model, the worsening factors of these four risk factors were further analyzed. The LCI model is applied to the new research field of safety risk assessment in civil engineering laboratories that few researchers have studied before and a risk list for civil engineering laboratories was created. We revealed the safety status of civil engineering laboratories in Jiangsu Province and provided feasible suggestions for improving the management and supervision of civil engineering laboratories at universities. It can strengthen operator awareness of the risks in civil engineering laboratories and improve the social group’s attention to the safety risks of the laboratories, thus reducing the accidents’ possibility and seriousness of civil engineering laboratories.

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Section: Discussionmentioning

confidence: 99%

Assessing the Safety Risks of Civil Engineering Laboratories Based on Lab Criticity Index: A Case Study in Jiangsu Province

Zhang

Peng

et al. 2020

IJERPH

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“…A mixture of fly ash, river, sand, and machine oil was selected to simulate the similar materials of surrounding rocks [44][45][46]. e ratio of hard rock was fly ash:river sand:oil � 50 : 40 : 10, and the ratio of soft rock was fly ash:river sand:oil � 45 : 40 : 15.…”

Section: Similar Materials Of Surrounding Rockmentioning

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

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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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“…However, due to the construction difficulty and the high construction cost, the damping layer is only used in the test section of the tunnel and has not been widely used in the tunnel seismic design. Another isolation method is that the damping joint with the simple construction technology can achieve almost the same effect of shock absorption, while the existence of the joint may reduce the waterproof performance of tunnel so as to shorten service life of the tunnel [15]. And, the strengthening method was proposed to enhance the seismic performance by increasing the mechanical properties of the rock and linings [16].…”

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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Shaking table test on flexible joints of mountain tunnels passing through normal fault

Cited by 80 publications

References 23 publications

Assessing the Safety Risks of Civil Engineering Laboratories Based on Lab Criticity Index: A Case Study in Jiangsu Province

Assessing the Safety Risks of Civil Engineering Laboratories Based on Lab Criticity Index: A Case Study in Jiangsu Province

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

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

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