... in subsurface exploration and gaining more and more attention from the engineering fratenity. The SASW method is based on analysis of the dispersion characteristic of Rayleigh waves (R-waves) in a nonhomogeneous medium. Dispersion means that the velocity of R-waves is dependent on the frequency or wavelength...

.... Resonance of the structure to seismic load can be avoided by maintaining a high natural frequency of the structure with a high prestress. A measures to maintain a sufficiently high prestress during strong shaking is presented. INTRODUCTION Geotextile-reinforced soil (GRS) structures have a reputation...

... analysis as reported elsewhere. 3) According to the wave penetration theory, a composite barrier such as the one referred to in this paper provides a high performance to isolate vibration even over lower ranges of frequency. Of the single material barriers herein considered the EPS barriers, indicating...

... the volume of material involved in the observed events and the calculated annual erosion rate. In the absence of more reliable data, the method provides a useful estimation of event size and frequency. INTRODUCTION On March 28 1990 two high school students were tragically killed by a rockfall while...

...ESTIMATION OF FAILURE FREQUENCY OF SOIL CUT SLOPES USING RAINFALL AND SLOPE INFORMATION P L Richard Pang, Wai-keung Pun and Yat-fung Yu1 ABSTRACT The Geotechnical Engineering Office keeps comprehensive rainfall and landslide data. A GIS database of all sizeable man-made slopes and retaining walls...

... UDECTM (1999), under plane strain conditions. These rock roofs contain vertical joints of varying frequency of occurrence and material compliance. frequency Reservoir Characterization joint stiffness voussoir beam rock beam joint frequency extreme strain thrust line cross section abutment...

... frequency shear wave velocity characteristic Engineering laboratory Reservoir Characterization wavelength receiver Upstream Oil & Gas wave velocity specimen particle motion stiffness application santamarina p-wave velocity wave propagation anisotropy procedure stokoe...

... changes with depth, these elastic waves are dispersive in nature, which means that they travel at a velocity that is dependent upon frequency (or wavelength). CSWS is a particularly attractive method of investigation for landfill engineering due to the non-intrusive nature of the method that eliminates...

... frequency for percussive drills; revolution speed, circulating fluid pressure and thrust for rotary bits; blow frequency, rotation speed and thrust, for rotary- percussion bits. The resultant parameters are the penetration rate, the torque and the reflected energy from the rock through the drilling pipes...

... great value. Next, frequency characteristics of the response acceleration records were studied. The Fourier spectra and time histories of the predominant frequency of horizontal ground acceleration in liquefied and non-liquefied areas were calculated. Then the average predominant frequency of the strong...

... an economical method of mapping resonant frequencies and thereby gaining a better knowledge of seismic risk in sedimentation basins.. INTRODUCTION Earthquakes are all demonstrations of the geodynamics of the planet, probably; those that marked the popular conscience so much their destructive aspects are big...

... ABSTRACT: This paper presents an experimental study on natural frequency of a foundation on a layered soil system subjected to dynamic loading. Using a Lazan type mechanical oscillator, model block vibration tests on a footing made up of steel and of size 300×300×50mm are conducted. Three...

... perfectly plastic model. The Abaqus Code (Hibbit et al. 1997) is used within this paper. Reservoir Characterization Artificial Intelligence three-dimensional nonlinear analysis cross-section frequency seismic response maximum value nunes drucker-prager model accelerogram Oliveira forjaz...

... current practice Reservoir Characterization pile group engineering practice pile foundation system frequency single pile seismic loading foundation soil superstructure American Petroleum Institute frequency interaction stiffness foundation FINN group effect evaluation group analysis...

... transducers so that the system can be idealized as shown in figure 1. The advantage of this method of test, is that measurements can be taken much more precisely than with pulse transmission techniques (e.g. Washington, 1961). Measurements of resonant frequency can easily be taken to within 1 part in 10,000...

... Upstream Oil & Gas site 2 peak particle velocity unfilled stope seismogram Reservoir Characterization backfilled stope ground motion ground velocity peak ground velocity frequency seismic wave dominant frequency amplitude geophone stope waveform gully seismic event...

...: To clarify the fatigue behaviour of granite, some laboratory rock tests were performed. In experiments. the effect of loading strain-rate on the static strength and the effect of frequency on fatigue strength were frist investigated. and then the influence of confining pressure and water on the fatigue...

... event 323 1440 Johannesburg seismic source parameter synthetic seismogram seismicity near-field contribution focal mechanism frequency event 248 1132 mining district South Africa Spottiswoode Rock at Great Depth, Maury & Fourmaintraux (eds), © 1990 Balkema, Rotterdam. ISBN 90 6191 9754...

... by AE monitoring technique. The Paper describes the results of experiments that the indicator m (ratio of amplitude to frequency of AE) and AE energy (square of amplitude of AE) are available to detect the initiation of small-scale failure of rock, i.e., the loosening of rock mass around opening. 1...

... own mechanical behaviour in its technical definition, having been withstand well defined designed to stress level. frequency maximum stress Probe cyclic fatigue construction materials Proc rock behaviour vertical axis Haimson Upstream Oil & Gas Loading Rate MPa apparatus...