The results of a refraction survey at a site are given in the following table: Distance of geophone from the source of disturbance (m) Time of first arrival (s × 10³) 2.5 11.2 5 23.3 7.5 33.5 10 42.4 15 50.9 20 57.2 25 64.4 30 68.6 35 71.1 40 72.1 50 75.5 Determine the P-wave velocities and the thickness of the material encountered.

The results of a refraction survey at a site are given in the following table: Distance of geophone from the source of disturbance (m) Time of first arrival (s × 10³) 2.5 11.2 5 23.3 7.5 33.5 10 42.4 15 50.9 20 57.2 25 64.4 30 68.6 35 71.1 40 72.1 50 75.5 Determine the P-wave velocities and the thickness of the material encountered.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

In tacheometry survey, an intercept of 0.755m was recorded on a staff which was believed to vertical, and the vertical angle measured on the theodolite was +15º. Actually, the staff which was 4 metres long was 0.14m out of plumb bob and leaning backwards away from the instrument position. Assuming it was an anallatic instrument with a multiplying constant of 100, what would have been the error in the computed horizontal distance?
Problem no. 2: The width of a river being observed is 75 m. Assuming the transit being used has an external focusing telescope with f = 0.3, c = 0.1 and K = 100, determine the unknowns in the table below. Horizontal distance from the transit to the rod at the right water edge Horizontal distance from the transit to the rod at the left water edge Determine the stadia intercept of the rod at the left water edge
A surveyor sights an elevation rod 200 feet away and reads 5.00 feet. After a correction for curvature and refraction, what is the corrected reading? This is a small correction, and the reading is a bit higher.
2 points B & C were observed from point A where the instrument was set up at a height of 1.25m. Points B & C are ahead of point A. The surveyor used an internally focusing telescope with a stadia interval factor of 100. The following data was recorded as observed for points B & C.(a) What is the stadia constant of the instrument?(b) What is the slope distance between the telescope at point A and the rod reading at point B?(c) What is the difference in elevation between point B & C?(d) What is the slope distance between the ground surface at point B and the ground surface at C?(e) What is the elevation of point C if point A is at an elevation of +0316.15m above mean sea level?
a.) (Triangulation): Two stations B and C were observed from a theodolite set up at station A and following data are recorded as follows: Line AB: azimuth = 345o10’ and distance = 156.45m Line AC: azimuth = 34o25’ and distance = 205.10m Determine the length of BC and its direction in azimuth b.) (Trilateration): In a trilateration network one of the triangles has the following data: AB = 156.67 m BC = 202.45m CA = 185.78m If the true bearing of side AB is N15o30’E, determine the bearing of side BC.
Surveying question: Considering the effects of curvature and refraction, the difference elevation of points B and C is found out to be 111.356m. From point A in between B and C is the angle of elevation of B and C are 18° 30' and 18° 30' respectively. a. If C is 2000m from A, how far is B from A. b. If the elevation of A is equal to 200m, find the elevation of B c. Find also the elevation of C
Point P is between points Q and R. The distances of Q and R from point P are 1000 m and 2000 m, respectively. Measured from point P, the angle of elevation of point R is 8°30’, while that of point Q is θ. The difference in the elevations of Q and R is 44.4 m, with R being lower than Q. Considering the effects of curvature and refraction, the value of θ is nearest to: a. 18°58’ b. 16°58’ c. 17°58’ d. 19°58’
Problem 4: The following data were obtained by stadia observation: vertical angle, +12°30': upper stadia hair reading, and lower stadia hair readings, 4.500 and 3.250 m, respectively. The rod reading was taken at 3.875 m above the stadia point at A and the height of the instrument above the instrument station, B, is 1.620 m. The stadia interval factor is 995 and the instrument constant is 0.381 m. a. Compute the horizontal distance between the instrument station and the stadia point. b. What is the vertical distance from the horizontal axis of the instrument to the rod reading? c. What is the inclined distance from the center of the instrument to the rod reading? d. Compute the difference in elevation between the two ground points.
The upper and lower stadia hair readings on a stadia rod held at station B were observed as 3.50 and 1.00 m, respectively, with the use of a transit with an internal focusing telescope and having a stadia interval factor of 99.5. The height of the instrument above station A is 1.45 m, and the rod reading is taken at 2.25 m. Determine the horizontal distance between points A and B, and the elevation of point B, if the elevation of point A is 155.54 m, above mean sea level.
For data below the average P over an area by thiessen method is? if the area for each station = 222 Km ^2 (P1=150mm, P2= 127mm, P3= 152mm, P4=106mm)
Point A is in between points B and C, the distances of B and C from B and C from point A are 1000m and 2000m respectively measured from point A. The angle of elevation of point B is 18°13' while that of C as Ø. The difference in the elevation of B and C is 44.4m. Considering the effects of curvature and refraction, what is the value of Ø? (Note: Assume that point C is higher) where: Earth's Curvature and Atmospheric Refraction Correction (Her): Her(m) = 0.067 K² K (km) = level distance Her K Vertical line Horizontal line Level line
Point A is between point Band C, the distances of point B and C frompoint A are 1km and 2 km respectively.Measured from point A, the angle ofelevation of point B is 1813’ while that of Cis theta. The difference in the elevation of B andC is 44.4 m. Considering the effects ofcurvature and refraction. What is the valueof theta?