scholarly journals Seismic Response of a Tunnel Embedded in Compacted Clay through Large-Scale Shake Table Testing

2018 ◽  
Vol 2018 ◽  
pp. 1-17
Author(s):  
Hao Zhou ◽  
Xinghua Wang ◽  
Changdi He ◽  
Changxi Huang
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Clay Soil ◽  
Shaking Table ◽  
Compacted Clay ◽  
Soil Pressure ◽  
Hoop Strain ◽  
Maximum Acceleration ◽  
Cross Sectional ◽  
Absorbing Layer

To investigate the seismic response of large-scale tunnel in compacted clay and effect of shock absorbing layer to the tunnel, a series of three dimensional (3D) shaking table model tests were carried out. The similarity ratio of the model is 1 : 8 and the size of the model container is 9.3 m (length) × 3.7 m (width) × 2.5 m (height). The cross-sectional diameter of the model tunnel is 0.9 m, and the thickness of the tunnel lining is 0.06 m. To simulate the clay soil surrounding condition, the container was filled with clay soil. During the tests, the concrete strain, acceleration, and dynamic soil pressure on the surface of the model tunnel were measured. The results show the existence of tunnel can decrease the maximum acceleration of the model in the X direction; the shock absorbing layer can further decrease the maximum acceleration, however, cannot change the dominant frequency of the ground motion. The longitudinal and hoop strain of the model tunnel with excitation of the input motion is mainly in tension state and the maximum hoop deformation of the model tunnel is located at the conjugate 45°. In addition, the shock absorbing layer has an effect on the strain and dynamic earth pressure of the model tunnel.

scholarly journals Seismic Response and Vibration Reduction Analysis of Suspended Structure under Wave Passage Excitation

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Wenhua Cai ◽  
Bujun Yu ◽  
Fajong Wu ◽  
Jianhua Shao
Keyword(s):  
Seismic Response ◽  
Wave Velocity ◽  
Vibration Reduction ◽  
Shaking Table ◽  
Dynamic Responses ◽  
Uniform Motion ◽  
Acceleration Response ◽  
Maximum Acceleration ◽  
Damping Effect ◽  
Suspended Structure

In order to study the influence of traveling wave effect on the seismic response and damping effect of suspended structure, a series of shaking table tests of the 1 : 20 suspended structure have been carried out to compare and analyze the dynamic responses of suspended structures under two points and a consistent input. The vibration damping effect and vibration reduction law of suspended structure are discussed at different apparent wave velocity and in the different connection. The research shows that the damping suspended structure has a good damping effect, and the amplitude reduction of the top displacement peak response is up to 15%, which corresponds to smaller apparent velocities. Moreover, the upper bound of the maximum acceleration response at the structures’ top under nonuniform input motions equals that of the uniform motion. However, there is a hysteresis in the acceleration response under wave travelling excitations, and the smaller the apparent wave velocity, the more obvious the hysteresis.

Large-Scale Laboratory Permeability Testing of a Compacted Clay Soil

1991 ◽  
Vol 14 (2) ◽  
pp. 171 ◽  
Author(s):  
PC Knodel ◽  
CD Shackelford ◽  
F Javed
Keyword(s):  
Large Scale ◽  
Clay Soil ◽  
Compacted Clay

scholarly journals Seismic Response of a Water Transmission Pipeline Across a Fault Zone Adopting a Large-Scale Vibration Table Test

2021 ◽  
Vol 9 ◽  
Author(s):  
Longsheng Deng ◽  
Wenzhong Zhang ◽  
Yan Dai ◽  
Wen Fan ◽  
Yubo Li ◽  
...  
Keyword(s):  
Seismic Response ◽  
Fault Zone ◽  
Large Scale ◽  
Hanging Wall ◽  
Active Faults ◽  
Dynamic Responses ◽  
Soil Pressure ◽  
Geologic Hazard ◽  
Amplification Ratio ◽  
Design And Construction

The seismic response is generally amplified significantly near the fault zone due to the influence of discontinuous interfaces and weak-broken geotechnical structures, which imposes a severe geologic hazard risk on the engineering crossing the fault. The Hanjiang to Weihe River Project (phase II) crosses many high seismic intensity regions and intersects with eight large-scale regional active faults. Seismic fortification of the pipelines across the fault zone is significant for the design and construction of the project. A large-scale vibration table test was adopted to investigate the seismic response and fault influences. The responses of accelerations, dynamic stresses, strains, and water pressures were obtained. The results show that the dynamic responses were amplified significantly by the fault zone and the hanging wall. The influence range of fault on acceleration response is approximately four times the fault width. The acceleration amplification ratio in the fault zone generally exceeds 1.35, even reaching 1.8, and the hanging wall amplification ratio is approximately 1.2. The dynamic soil pressure primarily depends on the acceleration distribution and is apparently influenced by pipeline location and model inhomogeneity. The pipeline is bent slightly along the axial direction, accompanied by expansion and shrinkage in the radial direction. The maximum tensile and compressive strains appear at the lower and upper pipeline boundaries near the middle section, respectively. Massive y-direction cracks developed in the soil, accompanied by slight seismic subsidence. The research findings could provide reasonable parameters for the seismic design and construction of the project.

Seismic response of concrete-rockfill combination dam using large-scale shaking table tests

2017 ◽  
Vol 99 ◽  
pp. 9-19 ◽  
Author(s):  
Jianxin Wang ◽  
Gui Yang ◽  
Hanlong Liu ◽  
Sanjay Shrawan Nimbalkar ◽  
Xinjun Tang ◽  
...  
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Shaking Table ◽  
Shaking Table Tests

scholarly journals Experimental Study on Seismic Response of a Large-Span and Column-Free Subway Station in Composite Strata

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Tingjin Liu ◽  
Siyuan Zheng ◽  
Xinwei Tang ◽  
Weixing Xu
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Boundary Effect ◽  
Soft Clay ◽  
Lateral Wall ◽  
Shaking Table ◽  
Subway Station ◽  
Model Structure ◽  
Soil Pressure ◽  
Large Span

In this paper, a shaking table test was conducted to investigate the seismic response of the large-span and column-free subway station in the upper-soft and lower-hard strata. The acceleration of the structure and the soil, the dynamic soil pressure, and the strain response of the subway station were obtained and analyzed. The results demonstrate the reasonable test design as the boundary effect was eliminated. The seismic response of the structure and soil became more severe as the acceleration amplitude of the input motion increased. It is indicated that possible shear damage of the soil and irreversible plastic deformation of the structure might have occurred as the test proceeded. The soft clay had a greater effect on the structure than that of the artificial rock. For the model structure, the tensile strain amplitude in the support region was larger than that in the midspan region. The support regions of the roof slab, lateral wall, and middle slab were the vulnerable components of the model structure during earthquakes.

The Analysis of Test of the Seismic Response for the Metro Station Structure Considering Soil-Structure Interaction

2012 ◽  
Vol 204-208 ◽  
pp. 2600-2604
Author(s):  
Ying Ming Zhou ◽  
Shu Wei Wang ◽  
Peng Wang ◽  
Li Na Yao
Keyword(s):  
Seismic Response ◽  
Large Scale ◽  
Underground Structure ◽  
Three Dimensional ◽  
Earth Pressure ◽  
Shaking Table ◽  
Underground Structures ◽  
Metro Station ◽  
General Law ◽  
Station Structure

In this paper, the subway station structure seismic response of large-scale three-dimensional shaking table model test is analysis, the model system acceleration response time, the stress response of the model structure of the schedule and structure of the surface of the earth pressure time is obtained, which has been the subway underground structure seismic response of the general law, the conclusion can provide a reliable basis and guidance for the seismic design of the MTR underground structures in the general venue.

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