Experimental Study on Seismic Dynamic Characteristics of Shallow‐Bias Tunnel with a Small Space

Wang, Feifei; Jiang, Xueliang; Niu, Jiayong; Yang, Hui

doi:10.1155/2018/6412841

Cited by 10 publications

(18 citation statements)

References 24 publications

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“…As shown in Figure 14(a), the first predominant frequency of the model tunnel gradually decreases from 26.65 Hz to 25.18 Hz and decreases by 5%; the second predominant frequency decreases from 7.29 Hz to 5.84 Hz and decreases by 19%. e main reason for this phenomenon is that the overall stiffness of the structural model is continuously decreasing with various seismic vibrations, which is similar to the result of the buried tunnel [19]. Cracks on the model tunnel and model soil observed during the test are indicated in Section 4.5.…”

Section: Fourier Spectramentioning

confidence: 59%

Experimental Study on Seismic Performance of Prefabricated Utility Tunnel

Duan

Dong

2019

Advances in Civil Engineering

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Utility tunnel is a kind of underground tunnel structure that carries more than two types of public utility lines, and the utility tunnels built by the prefabricated method have been adopted in many modern cities due to their easy maintenance and environmental protection capabilities. However, knowledge about the seismic performance of the prefabricated utility tunnel and pipelines inside is quite limited. In this paper, a prefabricated utility tunnel newly built in Xi’an, China, is taken as the prototype; a series of shaking table tests are conducted to investigate the seismic performance of the prefabricated utility tunnel in loess foundation, using El Centro earthquake wave as the input loading. Details of the experimental setup focus on the design of the soil container, scaled model (1 : 10), sensor arrangement, and test cases. Dynamic responses including evaluation of boundary effect, the amplification factor of the ground and structure, distribution of soil pressure, characteristics of predominant frequencies, and the damage phenomena are analyzed. Dynamic strain obtained by Fiber Bragg Grating sensors releases the critical positions of the prefabricated utility tunnel during the earthquake. Moreover, the dynamic responses of the pipelines contained in the utility tunnel are also analyzed. From aforementioned results, the seismic performance of the prefabricated utility tunnel has been revealed. The results will provide a reference for the seismic design of prefabricated utility tunnels.

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Section: Fourier Spectramentioning

confidence: 59%

Experimental Study on Seismic Performance of Prefabricated Utility Tunnel

Duan

Dong

2019

Advances in Civil Engineering

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“…The same is true with existing specifications [21,22]. However, in practice, the earthquake acceleration is a variable of great uncertainty in direction [23][24][25]. For example, a terrible earthquake struck Wenchuan County, Sichuan Province in 2008.…”

Section: Introductionmentioning

confidence: 72%

Theoretical Study on Relaxed Surrounding Rock Pressure on Shallow Bias Neighborhood Tunnels under Seismic Load

Liu

Xiong

Liu

et al. 2021

Period. Polytech. Civil Eng.

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To study the distribution of relaxed surrounding rock pressure on the shallow bias neighborhood tunnels under the combined action of horizontal and vertical earthquake force, finite element software was used for failure mode analysis. Moreover, with the pseudo-static method, the calculation formula for the relaxed pressure on the shallow bias neighborhood tunnels was derived and used to analyze the variation of the rupture angle of these tunnels under the action of the seismic force. The study shows that: shallow bias neighborhood tunnels basically follow a “W” failure pattern under the combined action of horizontal and vertical seismic force, and the failure scope of the surrounding rock is controlled by four rupture angles. Rupture angles β2 and β3 between the deep and shallow tunnels of the shallow bias neighborhood tunnels are not affected by the surface slope. For tunnels with the same grade of the surrounding rock, the greater the seismic intensity, the smaller the value of β2, and the greater the value of β3. While at the same seismic intensity, the higher the grade of the surrounding rock, the smaller the β2 and β3. Ruptures angles β1 and β4 are influenced by the surface slope, seismic intensity and surrounding rock grades. A steeper surface slope leads to a smaller β1 and a greater β4; β1 increase and β4 decrease with increasing seismic intensity; while, β1 and β4 both show a decreasing trend with an increasing rock grade.

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“…In Figure 8, group 9 is the quaternary system, group 11 is the Neogene rock mass, group 10 is the roof rock mass of K1 seam, group 7 is the roof rock mass of K1 seam and K2 seam, group 8 is the floor rock mass of K2 seam, and group 3, group 5, and group 6 are different grade ore bodies. In the numerical analysis of underground engineering, the key to successful calculation is not only the accurate calculation model but also the initial geo-stress field [27,28].…”

Section: Construction Of Numerical Modelmentioning

confidence: 99%

Numerical Simulation of Surface Movement and Deformation Caused by Underground Mining with Complex Stratigraphic Boundary

Wang

He²,

Cui³

et al. 2021

Advances in Civil Engineering

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The interface program of finite element software based on surface spline interpolation is developed by using MATLAB software. The controllable 3D surface modeling based on CAD contour is realized. Taking a mine as an example, the method of establishing the 3D numerical calculation model including complex stratum boundary is studied. The influence of underground mining on surface movement and deformation under complex stratum conditions by using the FLAC3D software further was discussed. The research results show that the developed interface program of finite element software can well realize the numerical modeling of complex formation and provide help for subsequent numerical simulation. The calculated subsidence value is in good agreement with the measured value. The values of surface tilt, surface curvature, and surface horizontal deformation are less than the relevant regulations. The mining method of the filling method has no obvious effect on the surface structures. The research results can provide reference for similar numerical simulation.

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Experimental Study on Seismic Dynamic Characteristics of Shallow‐Bias Tunnel with a Small Space

Cited by 10 publications

References 24 publications

Experimental Study on Seismic Performance of Prefabricated Utility Tunnel

Experimental Study on Seismic Performance of Prefabricated Utility Tunnel

Theoretical Study on Relaxed Surrounding Rock Pressure on Shallow Bias Neighborhood Tunnels under Seismic Load

Numerical Simulation of Surface Movement and Deformation Caused by Underground Mining with Complex Stratigraphic Boundary

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