Laws of Influence upon Dynamic Response of High Rock Slope by Seismic Wave Frequency

2012 ◽  
Vol 170-173 ◽  
pp. 615-625
Author(s):  
Shi Guo Xiao ◽  
Guang Cen Zhu ◽  
Jing Kai Li
Keyword(s):  
Dynamic Response ◽  
Shear Strain ◽  
Seismic Wave ◽  
Rock Slope ◽  
Simulation Analysis ◽  
Time History ◽  
Wave Frequency ◽  
Principal Stresses ◽  
Response Characteristics ◽  
High Rock Slope

On the basis of seismic wave recorded by Wolong Measuring Station in Wenchuan Earthquake occurred on May 12, 2008, and taking a high rock slope (about 1397m in height) at the bank of Zipingpu Reservoir as the specific example, analyses have been made, with Plaxis dynamical simulation analysis program, on characteristics of influence upon acceleration time history, shear strain distribution, principal stresses distribution and stability of high rock slope by original seismic wave, and seismic wave with frequency expanded by 1.5, 2 and 3 times, respectively. Results of the analyses demonstrate that dynamic response characteristics of the slope top are notably influenced by multiplication factor of seismic wave frequency. As far as the real slope in this article is concerned, it generally presents a gradual decrease of PGA of the top of high rock slope, reduction of slope body shear strain and a corresponding drop of dynamic response of slope body as a whole, with the increase of seismic wave frequency.

Dynamic Response Characteristics of Underground Powerhouse Caverns for Sandaowan Hydropower Station

2011 ◽  
Vol 382 ◽  
pp. 80-83 ◽  
Author(s):  
Zhen Zhong Shen ◽  
Hua Chun Ren
Keyword(s):  
Seismic Waves ◽  
Low Frequency ◽  
Time History ◽  
Element Model ◽  
Frequency Characteristics ◽  
Dynamic Responses ◽  
Principal Stresses ◽  
Underground Powerhouse ◽  
Response Characteristics ◽  
Set Up

According to the practical situation, the 3-D finite element model of Sandaowan underground powerhouse caverns on Taolai River is set up for analyzing the behaviors under earthquake action. Based on static stress field of the surrounding rock mass, and with the selection of appropriate seismic waves for dynamic time-history analysis method, the dynamic responses of underground powerhouse caverns are analyzed. It is shown that the time-history waveform of dynamic displacement of given points has a very similar variation regularity with that of acceleration, and the wave phases of both are almost synchronous. The dynamic displacements and principal stresses of the given points on rock walls are with the vibration of low-frequency characteristics, the acceleration response is with the vibration of high-frequency characteristics.

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.

Research the Layered Structure Affect on Seismic Dynamic Response of Rock Slope

2011 ◽  
Vol 382 ◽  
pp. 439-443
Author(s):  
Fa You A ◽  
Ji Ming Kong ◽  
Zhen Qiang Ni
Keyword(s):  
Dynamic Response ◽  
Layered Structure ◽  
Rock Slope ◽  
Dynamic Responses ◽  
Deformation And Failure ◽  
Response Characteristics ◽  
The Stability ◽  
Bedding Slope ◽  
Dip Slope ◽  
Better Than

The deformation and failure induced by Wenchuan earthquake between bedding and anti-dip slope existence very big difference. The number and size of the bedding slope deformation and failure are much more than the anti-dip slope according to the investigation and analysis. In order to analyze the layered structure affect on seismic dynamic response of rock Slope. As bedding and anti-dip slope is the study object and the seismic dynamic responses of different layered structure slope have been studied by using ANSYS finite element method in this study. Analysis shows that slope as a structure, the internal structure different lead to the slope seismic dynamic response is also different. The bedding and anti-dip slope seismic dynamic response is discontinuous or mutations in the slope as layered structure interface the boundary. And the seismic dynamic stress, displacement and acceleration of the bedding slope are always greater than the anti-dip slope. The seismic response characteristics further increased the deformation and failure probability of bedding slope. The results consistent with the investigation conclusion that the stability of anti-dip better than the anti-dip slope

scholarly journals Experimental Study on Dynamic Response Characteristics of RPC and RC Micro Piles in SAJBs

2019 ◽  
Vol 9 (13) ◽  
pp. 2644 ◽  
Author(s):  
Junfeng Cheng ◽  
Xiaoyong Luo ◽  
Yizhou Zhuang ◽  
Liang Xu ◽  
Xiaoye Luo
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Bending Moment ◽  
Pile Foundations ◽  
Strain Response ◽  
Soil System ◽  
Response Characteristics ◽  
Approach Slab ◽  
Dynamic Response Characteristics ◽  
Reactive Powder

The pile foundations below approach slab in a semi-integral abutment jointless bridge (SAJB) that requires high flexibility to accommodate the horizontal cyclic deformation of approach slab generated by the girder’s thermal expansion and contraction as well as earthquake action. In this paper, reactive powder concrete (RPC) and reinforce concrete (RC) micro piles were designed and fabricated. The shaking table tests on dynamic response of micro piles-soil interaction were conducted to investigate the dynamic response characteristics such as the strain time history of pile-soil system, the bending moment, and the deformation of piles. The maximum strain response of piles was observed at the buried depth of 4.2 D (D is the diameter of pile). Meanwhile, the maximum bending moments of RPC and RC piles appear at the depth of 0.64 D and 0.42 D, respectively, under the dynamic load excitation, and the peak horizontal deformation of piles were observed at pile head. It is found that the bending moment and the strain response of the RPC pile are larger than that of the RC micro pile, and increased by 40% and 98%, respectively. The RPC micro pile has better crack resistance, higher ductility, and flexural rigidity than that of the RC pile, and it can be widely used as pile foundations in SAJBs for the earthquake area.

scholarly journals Dynamic Response and Failure Process of a Counter-Bedding Rock Slope under Strong Earthquake Conditions

Symmetry ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 103
Author(s):  
Ming-Zhu Guo ◽  
Kun-Sheng Gu ◽  
Chen Wang
Keyword(s):  
Dynamic Response ◽  
Seismic Wave ◽  
Rock Slope ◽  
Amplification Factor ◽  
Failure Process ◽  
Slope Surface ◽  
Maximum Value ◽  
Acceleration Amplification ◽  
Weak Intercalated Layer ◽  
Bedding Rock Slope

There are massive landslides and potential landslides along the Three Rivers Basin in the Qinghai–Tibet Plateau, which pose a serious threat to the Sichuan–Tibet Railway. A normal shaking table model test was conducted to study the dynamic characteristics and dynamic response of a symmetrical counter-bedding rock slope based on the Zongrong Village landslide. The influences of the dynamic parameters, seismic wave type, and a weak intercalated layer on the slope’s dynamic response were considered. The results showed symmetry between the growth trend of the acceleration amplification factor and other research results. When the input wave amplitude was constant, the acceleration amplification factor increased at first and then decreased as the frequency increased. When the input frequency was near the slope’s natural frequency, the acceleration amplification factor increased at first and then decreased with an increase in the input amplitude and reached the maximum value at 0.3 g. The acceleration amplification factor increased linearly with height in the vertical direction inside the slope but increased slowly at first and then sharply along the slope surface, reaching the maximum value at the slope’s top and exhibiting an obvious “elevation effect”. When sinusoidal waves, Wolong waves, and Maoxian waves with the same amplitude were input, the slope’s amplification effect on the bedrock wave was more obvious. The weak intercalated layer showed the phenomenon of “thin layer amplification” and “thick layer attenuation” in response to the input seismic wave. The slope’s failure process can be roughly divided into three stages: (1) the formation of tensile cracks at the top and shear cracks at the toe; (2) the extension of cracks and the sliding of the slope-surface block; (3) the formation of the main sliding surface.

scholarly journals Dynamic Response Characteristics of a Toppling Rock Slope Under Seismic Excitation using Time-frequency Joint Analysis Method: A Case Study from the Southwest of Sichuan Basin, China

2021 ◽  
Author(s):  
Danqing Song ◽  
zhuo chen ◽  
Lihu Dong ◽  
Han Du
Keyword(s):  
Dynamic Response ◽  
Rock Slope ◽  
Geological Structure ◽  
Joint Analysis ◽  
Analysis Method ◽  
Time Frequency ◽  
Response Characteristics ◽  
Dynamic Analyses ◽  
Dynamic Response Characteristics ◽  
Dynamic Amplification

Abstract The two-dimensional dynamic analysis was used to study the dynamic response characteristics of a toppling rock slope based on the time-frequency joint analysis method using the FLAC (Fast Lagrangian Analysis of Continua). Two-dimensional dynamic analyses were carried out on two numerical models. The results of the numerical dynamic analyses show that the toppling slope has an topographic and geological dynamic amplification effect. There are an elevation and surface dynamic amplification effect in the toppling slope. The impacts of the structural planes in the models on their wave propagation characteristics and magnification effect were discussed. Directions of ground motion have impacts on the dynamic response of the models. Based on the frequency-domain analysis, the relationship between the frequency of waves and the dynamic response of the models was further studied. The geological structure have a great effect on the high-frequency components of waves. The analyses of marginal spectrum show that the energy mainly concentrated in the frequency band of seismic wave (7-10 Hz). Moreover, the seismic failure mechanism of the toppling rock slope was discussed. Geological structure determines the seismic failure mode of the slope. Cracks initiate in the top toppling plane, and the surface slope is damaged firstly under earthquake excitation; with the increase of seismic loading, a large-scale slip mass further forms gradually from the upper to the lower slope body.

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