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 in the form of a graph. Determine the depths of the strata. Vy = 2250 m/sec 8 x5 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 V3 172 m/sec d; = 22.5 m AB = 12.75 x 10' sec 10 20 d; 30 40 50 Distance m Figure Time of first wave arrival, seconds 6.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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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
V,
Rock
AB, = 8.75 x 10'sec
AC, 33.75 x 10 sec
AC: = 38.75 x 10 sec
d, = 2.188 m
V = 172 m/sec
di = 22.5 m
AB = 12,75 x 10 sec
10
20 d;
30
40
50
Distance m
Figure
Time of first wave arrival, seconds
Transcribed Image Text: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 V, Rock AB, = 8.75 x 10'sec AC, 33.75 x 10 sec AC: = 38.75 x 10 sec d, = 2.188 m V = 172 m/sec di = 22.5 m AB = 12,75 x 10 sec 10 20 d; 30 40 50 Distance m Figure Time of first wave arrival, seconds
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