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EN
Formation’s properties can be estimated indirectly using joint analysis of compressional and shear wave velocities. Shear wave data is not usually acquired during well logging, which is most likely for cost saving purposes. Even if shear data is available, the logging programs provide only sparsely sampled one-dimensional measurements: this information is inadequate to estimate reservoir rock properties. Thus, if the shear wave data can be obtained using seismic methods, the results can be used across the field to estimate reservoir properties. The aim of this paper is to use seismic attributes for prediction of shear wave velocity in a field located in southern part of Iran. Independent component analysis (ICA) was used to select the most relevant attributes to shear velocity data. Considering the nonlinear relationship between seismic attributes and shear wave velocity, multi-layer feed forward neural network was used for prediction of shear wave velocity and promising results were presented.
PL
W artykule zaprezentowano wyniki sondowań sejsmicznych typu SCPT, przeprowadzonych w iłach warwowych okolic Radzymina. Badania wykonano za pomocą aparatury SCPTu firmy Geotech. Rezultaty pomiarów poddano analizie statystycznej w celu opracowania zależności korelacyjnej prędkości fali ścinającej Vs od oporu na stożku qt. Analizy odniesiono do obowiązujących w światowych badaniach związków korelacyjnych wiążących prędkość fali ścinającej z parametrami penetracji sondowań statycznych.
EN
This paper presents a method of seismic piezocone tests. It presents a brief description of the SCPTu Geotech testing apparatus and testing methodology. The results obtained at Mokre test site from in situ measurements of seismic wave velocity in varved clays are presented and analyzed. Local statistical correlations between shear wave velocity Vs and cone resistance q1 are presented in this paper.
3
Content available remote Suction and shear wave velocity measurements for assessing sample quality.
EN
Sample quality is very important for obtaining reliable geotechnical parameters, especially because the reliability design method has been recently introduced into geotechnical engineering (for example, Eurocode 7). The sample quality is usually assessed by comparing the values of strength, Young's modulus and strain at failure from unconfined compression test as well as the values of pre-consolidation pressure, compression index, and volumetric strain at in situ stresses from oedometer test. However, since the assessment criteria are based on past experience, the above conventional methods should be examined carefully in order to explain whether they can or cannot be applied to the layers tested. In addition, it should be noted that they are destructive, i.e., after assessing the specimen quality, it is cannot be used for testing anymore. In this paper, the possibility of assessing a sample quality by suction (p'r) and shear wave velocity (vv) is examined.
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