SeisImager Pickwin V3.14 With Plotrefa V2.73 | Tested

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seismic tomography is one of the most important components of the seismic refraction imaging process (seisimager) in the engineering applications of geotechnical engineering. seismic tomography is considered as a computerised process of imaging of the subsurface geological structures. this process provides a method of determining the subsurface geological structure by interpreting the propagation of seismic waves in the subsurface (johnson and manning 2012). a simplified process of seismic tomography is depicted in figure 4. the seismic waves are generated at the surface and travels downward with the help of the stratigraphy. the subsurface stratigraphy is the medium that causes the propagation of the seismic waves. the subsurface medium causes the seismic waves to travel in different directions. this is done by the action of the media of the subsurface on the seismic waves. the seismic waves are measured at different depths from the surface, the measured signals are referred to as seismic data. after the raw seismic data are processed, the seismic data are then interpreted or imaged in the direction of the interest. in the interpretation of the seismic data, it is used to determine the subsurface physical properties of the medium using different methods. in the determination of physical properties of the medium, the interpretation of the geophysical data is performed in terms of p-wave velocity (vp) and s-wave velocity (vs) and density (ρ) (johnson and manning 2012). in the interpretation of the seismic data, the velocity and density are estimated by the use of a mathematical model (e.g., the salt dome model) or by the use of a semi-empirical model (e., the modified biot model). d8a7b2ff72

the experimental set-up for the study is shown in figure 2 and table 2. the observations obtained in the present study are in agreement with the study of onimisi et al. (2013) who reported the presence of sand, silty sand, sandy clay, clayey sand, and clayey sand in the highway. in the present study, the velocity values (p wave) are obtained for both sections (table 2).

highway failure is a critical problem for nations, especially developing countries. seismic monitoring is an alternative method for assessing pavement conditions. the objective of this study was to evaluate structural properties of selected subgrade materials and their sensitivity to p wave velocity and to model the subgrade soil as a function of p wave velocity and geotechnical properties. the results revealed that there is a positive correlation between vp and cbr (r=0.81), pi (r=0.61), fines (r=0.81), and sand (r=0.78). on the other hand, there is a negative correlation between vp and plasticity index (r=0.63). based on the regression analysis, the p wave velocity of the subgrade soil can be predicted using cbr, pi, fines, and sand. this implies that the p wave velocity increases with an increase in cbr value while the same decreases with an increase in fines and plasticity index. subgrade soil evaluation using integrated seismic refraction tomography and geotechnical studies: a case of ajaokuta-anyigba federal highway, north-central nigeriaall authors obasaju daniel opemipo, oloruntola moroof, oladele sunday, ojekunle victor & baiyegunhi christopher published online:26 july 2022figure 8. prediction of p wave velocity as a function of cbr, pi, fines and sand using regression analysis.