scholarly journals Shaking Table Test on the Tunnel Dynamic Response under Different Fault Dip Angles

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1375
Author(s):  
Duan Zhu ◽  
Zhende Zhu ◽  
Cong Zhang ◽  
Xinghua Xie
Keyword(s):  
Dynamic Response ◽  
Inclination Angle ◽  
Shaking Table Test ◽  
Material Selection ◽  
Sine Wave ◽  
Tunnel Lining ◽  
Shaking Table ◽  
Water Diversion ◽  
Peak Strain ◽  
Strain Data

Fault-crossing tunnels are often severely damaged under seismic dynamics. Study of the dynamic response characteristics of tunnels crossing faults is thus of great engineering significance. Here, the Xianglushan Tunnel of the Central Yunnan Water Diversion Project was studied. A shaking table experimental device was used, and four sets of dynamic model tests of deep-buried tunnels with different fault inclination angles were conducted. Test schemes of model similarity ratio, similar material selection, model box design, and sine wave loading were introduced. The acceleration and strain data of the tunnel lining were monitored. Analysis of the acceleration data showed that when the input PGA was 0.6 g, compared with the ordinary tunnel, the acceleration increases by 117% when the inclination angle was 75°, 127% when the inclination angle was 45°, and 144% when the inclination angle was 30°. This indicates that the dynamic response of the cross-fault tunnel structure was stronger than that of the ordinary tunnel, and the effect was more obvious as the fault dip angle decreased. Analysis of the strain data showed that the strain response of the fault-crossing tunnels was more sensitive to the fault dip. The peak strain and increase in fault-crossing tunnels were much larger than those of ordinary tunnels, and smaller fault dips led to larger increases in the strain peak; consequently, the tunnel would reach the ultimate strain and break down when the input PGA was smaller. Generally, the influence of fault inclination on the dynamic response of the tunnel lining should receive increased consideration in the seismic design of tunnels.

scholarly journals Study on Dynamic Response Characteristics and Damage Mechanism of Tunnel Lining at Entrance of Shallow Bias Tunnel

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Lin Li ◽  
Xiaodan Guo ◽  
Zuyin Zou ◽  
Zhanyuan Zhu ◽  
Zihong Guo ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Structural Damage ◽  
High Speed ◽  
Shaking Table Test ◽  
Internal Force ◽  
Tunnel Lining ◽  
Shaking Table ◽  
Response Characteristics ◽  
Instability Problem ◽  
Dynamic Response Characteristics

The structural damage of the lining structure at the entrance of a tunnel is the most common instability problem. The instability problem may cause dynamic effects such as earthquakes and blasting. Based on the seismic damage data collected from previous major earthquakes at the entrance of shallow-buried tunnel, the shaking table test and numerical simulation are used to analyze dynamic response characteristics and damage evolution characteristics of the tunnel in the shallow-buried hole at 30°. The study revealed the stress characteristics of tunnel lining and the mechanism of structural damage under earthquake excitation. The research results show that the biased tunnel (30°) is susceptible to damage on the unsymmetrical loading side, the biased ground surface leads to acceleration, and high speed also significantly increases the effect. The biased side leg of the tunnel lining cross section is a location with a large internal force distribution. The biased tunnel has a relatively unfavorable internal force value distribution and a larger peak, and the peak at the larger bias side has the largest peak value. The skewback and spandrel portion of the biased tunnel lining load are more likely to be damaged.

Experimental Study on Fiber Concrete Lining in Tunnel with Seismic Dynamic Response

2013 ◽  
Vol 671-674 ◽  
pp. 1126-1130
Author(s):  
Jia Mei Zhou ◽  
Guo Wang Meng ◽  
Yao Yao Hu ◽  
Cai Zhang Xu
Keyword(s):  
Dynamic Response ◽  
Plain Concrete ◽  
Theory Model ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Shaking Table ◽  
Concrete Lining ◽  
Time Curve ◽  
Fiber Concrete ◽  
Similar Theory

Sesmic dynamic response of Fiber Reinforced Concrete tunnel lining is studied in contrast to the plain concrete. Based on similar theory, model test has been carried out through the 5m×5m triaxial shaking table by inputting sesmic wave, then the damage characteristics of tunnel lining is acquired.The test results show that both the plain concrete and fiber concrete is brocken by sesmic load, but fracture form is not the same,the crack on Fiber concrete is narrow and sawtooth , the crack on plain concrete is wide and straight.Fiber concrete lining strain-time curve is sawtooth partly, it’s vibration reponse is a little lagger than that of plain concrete.It indicats that kinematic velocity of concrete granule is decreased and sesmic energe is absorbed by fiber cohesive force,then frequence amplitude can be reduced.So fiber concrete can be proved as fine anti-seismic material.

Study on Lateral Dynamic Response of Pile Foundation in Liquefiable Soil by Using FBG Method

2012 ◽  
Vol 238 ◽  
pp. 337-340 ◽  
Author(s):  
Yu Run Li ◽  
Yan Liang ◽  
Xing Wei ◽  
Yun Long Wang ◽  
Zhen Zhong Cao
Keyword(s):  
Dynamic Response ◽  
Data Acquisition ◽  
Pile Foundation ◽  
Maximum Stress ◽  
Shaking Table Test ◽  
Data Acquisition System ◽  
Seismic Damage ◽  
Shaking Table ◽  
Calculation Methods ◽  
Liquefiable Soil

The study on lateral dynamic response of pile foundation in liquefiable soil is a significant part about seismic damage. In this paper, a new data acquisition system of FBG and calculation methods is used in the small shaking table test. The results show that FBG method used in this test is proved to be efficient and acceptable in both time characteristics and precision characteristics, it may be widely applied in the future doubtlessly. What’s more, the characteristics of p-y curves in different peak accelerations are discussed. And varying of maximum stress and displacement by corresponding acceleration is discussed. A contrast about p-y curve between dry sand and saturate sand is related, which provides a new direction in research about p-y curve.

scholarly journals Development of the Shaking Table and Array System Technology in China

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Chun-hua Gao ◽  
Xiao-bo Yuan
Keyword(s):  
Experimental Technique ◽  
Shaking Table Test ◽  
Material Selection ◽  
Status Quo ◽  
Shaking Table ◽  
Experimental Simulation ◽  
Control Technique ◽  
Developmental Trend ◽  
Maximum Acceleration ◽  
Advantages And Disadvantages

Shaking table is important experimental equipment to carry out antiseismic research. Research, conclusion, comparison, and analysis concerning the developmental history, constructional situation, performance index, control algorithm, and experimental technique of the internal shaking table were reviewed and compared. Such functional parameters as internal shaking table’s table-board size, bearing capacity, working frequency, and maximum acceleration were given. Shaking table’s constructional status quo and developmental trend were concluded. The advantages and disadvantages of different control algorithms were contrastively analyzed. Typical shaking table test, array system tests, and experimental simulation materials were induced and contrasted. Internal existing shaking table and array system test’s structural type, reduced scale, and model-material selection were provided. Analysis and exposition about the developmental tendency of shaking table’s enlargement, multiple shaking tables array, full digitalization, and network control were made. The developmental direction, comparison of technical features, and relevant research status quo of shaking table with high-performance were offered. The result can be reference for domestic or overseas shaking table’s design and type selection, control technique, and research on experimental technique.

scholarly journals Shaking Table Tests for Seismic Response of Orthogonal Overlapped Tunnel under Horizontal Seismic Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Honggang Wu ◽  
Hao Lei ◽  
Tianwen Lai
Keyword(s):  
Dynamic Response ◽  
Seismic Response ◽  
Seismic Wave ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Acceleration Response ◽  
Test Device ◽  
Deformation Stages ◽  
Superposition Effect

This paper presents the seismic dynamic response and spectrum characteristics of an orthogonal overlapped tunnel by shaking table tests. First, a prototype of the engineering and shaking table test device, which was used to design details of the experiment, was developed. Then, the sensors used in the test were selected, and the measurement points were arranged. Subsequently, the Wenchuan seismic wave with horizontal direction in different peak ground accelerations was inputted into the model, followed by a short analysis of the seismic response of the overlapped tunnel in the shaking table test as well as the distribution of the peak acceleration. Throughout the studies, the model exhibited obvious deformation stages during the seismic wave loading process, which can be divided into elastic, plastic, plastic enhancement, and failure stage. In particular, the time- and frequency-domain characteristics of the key parts of the tunnel were discussed in detail by using the continuous wavelet transform (CWT) based on the Morlet wavelet as the basis function. We found that the acceleration response was more intense within 25–60 s after the seismic wave was inputted. Furthermore, owing to “the superposition effect,” the seismic response at the crown of the under-crossing tunnel was stronger than that at the invert of the upper-span tunnel. The low and medium frequencies in the transformation of small scales (5–20) significantly affected the overlapped tunnel. These results elucidate the seismic dynamic response of the overlapped tunnel and provide guidance for the design of stabilizing structures for reinforcing tunnels against earthquakes.

scholarly journals Dynamic Response Characteristics of Aeolian Sediment along Sichuan-Tibet Railway

2021 ◽  
Vol 2 (2) ◽  
Author(s):  
Kan Han ◽  
Chunxiao Xue
Keyword(s):  
Dynamic Response ◽  
Ground Motion ◽  
Shaking Table Test ◽  
Soil Layer ◽  
Time History ◽  
Surface Displacement ◽  
Shaking Table ◽  
Aeolian Sand ◽  
Response Characteristics ◽  
Dynamic Response Characteristics

In order to reduce the damage of liquefaction of aeolian sand along the Sichuan-Tibet railway, the dynamic response characteristics of saturated aeolian sand in the study area were discussed by using shaking table test. The results show that the macroscopic characteristics of saturated aeolian sand in the study area are subsidence, water flow and fracture. The displacement time history shows that the surface displacement increases with increasing the input ground motion acceleration. When the acceleration is small (0.1g), the vibration in the soil layer has an obvious tendency to enlarge continuously from bottom to top. With the increase of the acceleration (0.2g), the amplification trend basically disappeared. When the acceleration increases to 0.3g, the ground motion increases first and then decreases.

SSI Damping System Research Based on Discontinuity of the Motion

2011 ◽  
Vol 287-290 ◽  
pp. 2144-2147 ◽  
Author(s):  
Zhi Ying Zhang ◽  
Zhan Chao Gao ◽  
Ying Li
Keyword(s):  
Dynamic Response ◽  
Dynamic System ◽  
Soil Structure ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
System Research ◽  
Structure Interaction ◽  
Linear Elastic ◽  
Elastic Range

The Soil-Structure Interaction (SSI) Effect exists everywhere, but the existing researches on actual damping of SSI system are not so sufficient, and the analysis of its real dynamic response becomes unsuitable to engineering applications. In this paper, the possibility of regarding SSI system as classical damping system in linear elastic range is studied. The motion domains and the equation of the dynamic system in each domain are confirmed with respect to boundaries. The research on Shaking Table Test of SSI system is shown as an example of supporting the feasibility of regarding SSI system as classical damping system similarly.

Shaking Table Test of Underground Pipeline under Three Dimension Seismic Excitation – Numerical Simulation

2014 ◽  
Vol 919-921 ◽  
pp. 960-964 ◽  
Author(s):  
Xiao Fu ◽  
Jun Wei Bi ◽  
Zhi Jia Wang ◽  
Chang Wei Yang
Keyword(s):  
Numerical Simulation ◽  
Dynamic Response ◽  
Seismic Response ◽  
Shaking Table Test ◽  
Time History ◽  
Shaking Table ◽  
Seismic Excitation ◽  
Underground Pipeline ◽  
Three Dimension ◽  
Seismic Structure

Based on the design of the large-scale shaking table test of an underground pipeline under three dimension seismic excitation, the dynamic response of the soil-structure is analyzed by using ANSYS. In the numerical simulation, Drucker-Prager constitutive model is adopted to simulate the soil, the interface between soil and pipeline are simulated with zero thickness contact elements, size effects of test box are diminished by defining viscoelastic boundary around soil, the acceleration time history curve of the original earthquake wave is compressed and processed according to using the model scale similarity and energy duration which is presented by Trifunac-Brady [1] , and then the characteristic of seismic response of the pipeline can be found. The results show that the top of pipeline is the seismic response intense regional, deformation displacements of the central areas at the bottom and top of pipeline are always larger than others, the entrance and exit are the weak positions of anti-seismic structure; moreover, the dynamic response and interactions of soil-pipeline in the model experiment can be more accurately simulated by the methods presented in the paper. Thus, it can be served as reference for the design and construction of subsurface structures.

Similitude Material Confecting of Tunnel Model in Shaking Table Test

2014 ◽  
Vol 501-504 ◽  
pp. 1774-1778
Author(s):  
Xiao Ning Deng ◽  
Yun Hui Jiang ◽  
Zhi Jia Wang ◽  
Fei Cheng Liu ◽  
Jian Jing Zhang
Keyword(s):  
Compressive Strength ◽  
Elasticity Modulus ◽  
Shaking Table Test ◽  
Orthogonal Test ◽  
Tunnel Lining ◽  
Ultimate Compressive Strength ◽  
Shaking Table ◽  
Tunnel Model ◽  
Research Achievement ◽  
The Relationship

On the basis of analyzing recent years research achievement of similitude material, we adopt cement, gypsum, blanc fixe and water to perform matching experiment. Orthogonal test has been used in this experiment. From the calculating data, it can be received that density, elasticity modulus and ultimate compressive strength in different specimens. Meanwhile, the relationship between elasticity modulus, ultimate compressive strength and the proportion of each composition is obtained. The results show that the similitude material is recognized to satisfy actual tunnel lining properties such as elasticity modulus and ultimate compressive strength .

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