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 in the form of a graph. Determine the depths of the strata. V, = 2250 m/scc x 5 x 10 Surface soil V; = 750 m/sec Sand and loose gravel V, Rock AB, = 8.75 x 10 see AC, = 33.75 x 10 sec AC: = 38.75 x 10 sec d = 2.188 m V = 172 m/sec d; = 22.5 m AB = 12,75 x 10 see d 10 20 d; 50 30 Distance m 40 Time of first wave arrival, seconds e ri
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 in the form of a graph. Determine the depths of the strata. V, = 2250 m/scc x 5 x 10 Surface soil V; = 750 m/sec Sand and loose gravel V, Rock AB, = 8.75 x 10 see AC, = 33.75 x 10 sec AC: = 38.75 x 10 sec d = 2.188 m V = 172 m/sec d; = 22.5 m AB = 12,75 x 10 see d 10 20 d; 50 30 Distance m 40 Time of first wave arrival, seconds e ri
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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,
Surface soil
V = 750 m/sec
Sand and loose gravel
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
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