Shaking table tests of the seismic response of a utility tunnel with a joint connection

Ding, Xuanming; Feng, Li; Wang, Chenglong; Chen, Zhixiong; Han, Liang

doi:10.1016/j.soildyn.2020.106133

Cited by 41 publications

(10 citation statements)

References 30 publications

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“…A typical and representative gas compartment [24][25][26][27] of a real utility tunnel in China's Beijing City is introduced in this study, as shown in Figure 1, represented by the following parameters: section width, w c � 2.00 m; section height, h c � 4.00 m; length of gas compartment (distance between two adjacent firewalls), L c � 200.00 m. e city gas is uniformly mixed together with the air at a specific ratio to create the gas mixture. e gas compartment is filled with the gas mixture at a certain length at one end of it.…”

Section: Brief Introduction Of Gas Compartmentmentioning

confidence: 99%

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Lin

Hou

Derlatka

et al. 2022

Shock and Vibration

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Combined with the k-ε turbulence model of general application, a refined finite element model of a utility tunnel’s gas compartment filled with the methane/air mixture is developed. A series of analyses are made by using the powerful industry-leading computational fluid dynamics (CFD) software flame acceleration simulator (FLACS) to study the shock wave propagation rule in the gas compartment. The longitudinal and transversal distribution laws of the explosion shock wave are gained taking into consideration the spatial characteristics of the gas compartment. The influences of a few parameters, such as initial conditions and section size of the gas compartment, on the shock wave propagation rule are further discussed. The basic procedure for predicting the peak pressure of the blast wave is provided by considering the initial conditions and the gas compartment, and the corresponding injury effect of the explosion wave on the living beings is assessed. The investigation demonstrates that the peak pressure by the coupled effect between the initial conditions is significantly influenced, especially at the upper and lower gas explosion limits. The peak pressure increases gradually as the width or height increases, and both basically meet the linear relation. The proposed method can forecast the peak pressure of the explosion shock wave in the gas compartment accurately. According to the peak pressure longitudinal and transversal distributions of the blast wave, the peak pressure is far greater than the killing pressure threshold in the underground and closed space; consequently, it is not safe for the living beings in the gas compartment.

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Section: Brief Introduction Of Gas Compartmentmentioning

confidence: 99%

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Lin

Hou

Derlatka

et al. 2022

Shock and Vibration

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“…Including the seismic response of the single-compartment utility tunnel, 19 the influence of non-uniform seismic, 20,21 and the seismic response of the connection joints of the cast-in-place utility tunnel. 22 Special seismic excitation is also an important factor affecting the seismic response of the utility tunnel. 23 In some studies, 24,25 the interaction between the utility tunnel and its internal pipeline under seismic excitation was considered to obtain more detailed seismic responses.…”

Section: Introductionmentioning

confidence: 99%

“…There is severe damage on the top of UT and various degrees of fracture in the connection joints between the top slab and the exterior wall, mainly along the Y-direction, as shown in Figure16(C).To compare the differences in the seismic damage of prefabricated utility tunnels and integral cast-in-place utility tunnels, this paper summarizes the test results for integral cast-in-place utility tunnels from results in other literatures and compares them with those of spit-type prefabricated utility tunnels in this test, as shown in Figure17. Based on existing experimental researches,19,22,25,29,45 the vulnerable parts of integral cast-in-place utility tunnels during earthquakes are concentrated at the corners of the internal rectangular sections, and the failure mode is mainly vertical cracks. While the damaged parts of UT in this research are mainly concentrated at the connection joints of adjacent components, and the failure modes are mainly crushing and spalling, which are very different from that of the integral cast-in-place utility tunnel.…”

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confidence: 99%

Experimental research on seismic response of split‐type prefabricated utility tunnels through shaking table tests

Luo

Zhou

2022

Earthq Engng Struct Dyn

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Due to the advantages of prefabricated structure, its applications in utility tunnels are increasing. However, more connection joints have raised concerns about the vulnerability of prefabricated utility tunnels in earthquake disasters. The main objectives of this research are to analyze the seismic response, vulnerable parts and failure modes of a prefabricated utility tunnel. A pair of twin models of prefabricated utility tunnels with two‐compartment layouts were designed, and then set up to load ground motions synchronously through a large‐scale shaking table of 6 m × 6 m under two different boundary conditions: one buried inside a soil box and its twin laid outside the soil as a comparison. The results show that: the damage of the split‐type prefabricated utility tunnel is mainly concentrated in the connection joints, and the connection joint at the top corner of the compartment with larger cross section is the vulnerable part that needs special attention; the SSI effect has a great influence on the seismic response of the prefabricated utility tunnel, and the model buried inside the soil box shows stronger seismic response than its twin laid outside the soil. The experimental results and analysis in this paper can provide a helpful reference for risk assessment and prevention, seismic design, and structural optimization of prefabricated utility tunnels.

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“…Up to now, a number of experimental and theoretical researches on the horizontal bearing characteristics of piles in silica sand (Guo 2006(Guo , 2013Lin et al 2015;Matlock 1970;Reese et al 1974) and clay (Cecconi et al 2019;Ding et al 2020b;Hong et al 2017;Huang et al 2017) have been conducted, but the data concerning the coral materials is very limited (Dyson and Randolph 2001;Guo and Zhu 2005;Novello 1999;Wesselink et al 1988;Williams et al 1988). Nevertheless, the unique mechanical properties of coral sand have not been taken into account, and the derived load-transfer curves are not cast in a general form that would allow an extension to different conditions.…”

Section: Introductionmentioning

confidence: 99%

Study on horizontal bearing characteristics of pile foundations in coral sand

et al. 2021

Self Cite

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This paper presents the horizontal bearing characteristics of piles in coral sand and silica sand from comparative experimental studies. A total of 6 model piles with different diameters are tested. The horizontal bearing capacity, deformation characteristic, bending moment, p-y curve, the change in soil horizontal pressure, as well as the particle breakage behaviour of coral sand are investigated. The results show that, in coral sand foundation, the horizontal bearing capacities of piles and the increments of soil horizontal pressures are obviously greater than those in silica sand. Accordingly, the lateral displacement, the rotation of pile head, the bending moment and the corresponding distribution depth in coral sand are significantly smaller than that in silica sand. The p-y curves indicate that the horizontal stiffness of coral sand is greater than that of silica sand. Remarkably, the breakage behaviour of coral sand is mainly distributed in the range of 10 times pile diameter depth and 5 times pile diameter width on the side where the sand is squeezed by pile. Furthermore, in coral sand, the influence of pile size is more pronounced, the squeezing force generated by pile spread farther and its influence range is larger compared to those in silica sand.

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Shaking table tests of the seismic response of a utility tunnel with a joint connection

Cited by 41 publications

References 30 publications

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Experimental research on seismic response of split‐type prefabricated utility tunnels through shaking table tests

Study on horizontal bearing characteristics of pile foundations in coral sand

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