Example 9.12 A seismic survey was carried out for a large project to determine the nature of the substrata. The results of the survey are given in Fig. i 2 in the form of a graph. Determine the depths of the strata. V, = 2250 m/sec x 5 x 10 C, V, Surface soil V 750 m/sec Sand and loose gravel H V, Rock AB, = 8.75 x 10' sec AC, 33.75 x 10 sec AC: = 38.75 x 10 sec d, = 2.188 m d = 22.5 m AB = 12.75 x 10 sec V = 172 m/sec 10 20 d; 30 40 50 Distance m Figure Time of first wave arrival, seconds
Example 9.12 A seismic survey was carried out for a large project to determine the nature of the substrata. The results of the survey are given in Fig. i 2 in the form of a graph. Determine the depths of the strata. V, = 2250 m/sec x 5 x 10 C, V, Surface soil V 750 m/sec Sand and loose gravel H V, Rock AB, = 8.75 x 10' sec AC, 33.75 x 10 sec AC: = 38.75 x 10 sec d, = 2.188 m d = 22.5 m AB = 12.75 x 10 sec V = 172 m/sec 10 20 d; 30 40 50 Distance m Figure Time of first wave arrival, seconds
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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