Blasting vibration control based on whole time-history response prediction of high rock slope

2012 ◽  
pp. 773-782
Keyword(s):  
Vibration Control ◽  
Rock Slope ◽  
Time History ◽  
Response Prediction ◽  
Blasting Vibration ◽  
Time History Response ◽  
High Rock Slope

Enhanced Multiaxis Vibration Control Using a Robust Generalized Inverse System Matrix

1995 ◽  
Vol 38 (2) ◽  
pp. 36-42
Author(s):  
Jeffrey Fletcher ◽  
Håvard Vold ◽  
Mark Hansen
Keyword(s):  
Vibration Control ◽  
Control Process ◽  
Time History ◽  
Control Technique ◽  
System Matrix ◽  
Vehicle Simulation ◽  
Full Vehicle ◽  
Wear And Tear ◽  
Time History Response ◽  
Equipment Wear

Multiaxis vibration control as a means to recreate service stress in the laboratory has achieved a great deal of success in the last decade. While initial applications centered around components and assemblies requiring a relatively few number of inputs (1 to 4), current applications such as a full-vehicle simulation may require 12 or more exciters. The complexity of the control process required to accurately reproduce the time history response for a full-vehicle simulation often requires that an expert operator intervene to coax the system into convergence. The time spent developing a control signal for a simulation test is costly in terms of both program timing and equipment wear and tear. Often compromises must be made due to the inability of the control system to create a fully accurate response given the available time and resources. This paper discusses the development and application of a new robust control technique that decreases operator interaction while improving control accuracy.

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.

A statistical study on artificially generated earthquake records

1976 ◽  
Vol 3 (1) ◽  
pp. 11-19
Author(s):  
W. K. Tso ◽  
B. P. Guru
Keyword(s):  
Statistical Study ◽  
Spectral Response ◽  
Flexible Structures ◽  
Time History ◽  
Maximum Response ◽  
Response Analysis ◽  
Seismic Region ◽  
Natural Period ◽  
Earthquake Records ◽  
Time History Response

A statistical study has been done to investigate (i) the variation of spectral responses of structures due to artificially generated earthquake records with identical statistical properties, (ii) the effect of duration of strong shaking phase of artificial earthquakes on the response of structures, and (iii) the number of earthquake records needed for time-history response analysis of a structure in a seismic region. The results indicate that the flexible structures are more sensitive to the inherent statistical variations among statistically identical earthquake records. Consequently several records must be used for time-history response analysis. A sample of eight or more records appear to provide a good estimate of mean maximum response. The duration of strong shaking can significantly affect the maximum response. Based on the results, it is suggested that for the purpose of estimating peak response, the strong shaking duration of the input earthquake motion should be at least four times the natural period of the structure. The maximum responses due to statistically identical ground motion records are observed to fit approximately the type 1 extreme value distribution. Thus, it is rationally possible to choose a design value based on the mean, standard deviation of the spectral response values and tolerable probability of exceedance.

Settlement Analysis of Soft Ground Replacement under Earthquake

2012 ◽  
Vol 166-169 ◽  
pp. 2379-2382 ◽  
Author(s):  
Zhong Liu ◽  
Shu Hong An ◽  
Rong Hong Yuan ◽  
Fei Li
Keyword(s):  
Time History ◽  
Vertical Displacement ◽  
Response Analysis ◽  
Soft Ground ◽  
Positive Contribution ◽  
Foundation Soil ◽  
Time History Response ◽  
Dynamic Time ◽  
Settlement Analysis ◽  
Different Thickness

The dynamic time-history response analysis method was employed to analyze the dynamic response of soft ground replacement with sand-gravel cushion. The deformation distribution of soft ground replacement with different thickness sand-gravel cushion was investigated under seismic wave. The results reveal that the bearing and asti-deformation capacity can be improved effectively for replacement sand-gravel cushion under earthquake loads by increasing the thick of cushion. The vertical displacement of foundation soil decreases gradually with the increase of the thick of cushion. The practice shows that replacement sand-gravel cushion provides a positive contribution to the aseismic effect of foundation soils mass. The present research can provide some references to similar projects.

Sign in / Sign up

Export Citation Format

Share Document