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Structural Deformation Surveying


Quiz Questions

1.USACE Engineering Divisions and Districts have the responsibility for formulating inspection plans, conducting inspections, processing and analyzing instrument observations, evaluating the condition of the structures, recommending inspection schedules, and preparing inspection and evaluation reports.
True
False
2. The ________________ is mainly concerned with building or installing the physical network of surface movement points for a monitoring project.
Instrumentation plan
Measurement scheme
3.The design of the survey measurement scheme should include analysis and specifications for location and coverage of monitoring points on the project.
True
False
4.In data analysis, _____________________ is the magnitude of the displacement
½dn½ = 1/sqrt (Dx2 + Dy2 + Dz2) for n points
½dn½ = sqrt (Dx2 + Dy2 + Dz2) for n points
5.ICOLD is abbreviated as ________________________________.
International Commission on Large Dams
International Construction on Large Deformation Dams
6.ISM is abbreviated as_________________________________.
International Society for Mine Surveying
International Society for Minimum deformation
7.__________________________ are used to monitor uplift pressures beneath the lock structure.
Pyrometers
Piezometers
8.Distress in sheet pile structures does not include any of the following: misalignment, settlement, cavity formation, or interlock separation.
True
False
9.A project datum does not define the relative positions and coordinates established on the reference network.
True
False
10.Figure 2-2 represents a ___________________________________.
Reference network configuration for a concrete dam depicting reference points near abutments and at downstream locations
Strong monitoring scheme for a concrete or earth/rockfill dam
11.Monuments can be classified as either a reference point or a monitoring point. A reference point typically is located away from the structure and is to be occupied during the survey, while a monitoring point is located directly on the structure and is to be monitored during the survey.
True
False
12._______________________points placed in the earth are installed to a depth equal to at least twice the depth of frost penetration in the project area.
Reference
Monitoring
13.Monitoring points installed in earth consist of a nominal __________________length of square steel hollow structural section with a nominal side length of 5 cm and a wall thickness not less than that for a standard weight square steel hollow structural section.
3 mm
3 cm
3 m
14.Electronic total station is a force-centered, standard target set/prism combination used with a particular total station.
True
False
15.Positioning accuracy required for each monitored point is __________________related to the maximum expected displacement occurring under normal operating conditions.
Indirectly
Directly
16.__________________________is a measurement design technique used to statistically verify whether a proposed monitoring survey meets pre-set accuracy requirements.
Pre-analysis
Post-analysis
17.Some measurement reliability factors do not include redundant measurements and external checks on the validity of the data.
True
False
18.The accuracy (standard deviation) of EDM instruments is expressed as:
s = sqrt ( a 2 + b 2 • S 2 )
True
False
19.__________________ are bulky and capricious in use but one may achieve with them a standard deviation of ± 0.1 mm ± 0.1 ppm.
Single frequency instruments
Dual frequency instruments
20.Figure 3-5 represents _________________________.
Standard GPS equipment for precise surveying
GPS equipment setup on a concrete hydropower dam
21.The major sources of error contaminating the GPS measurements are ___________________________.
Signal propagation errors
Receiver related errors
Both
None
22.The photo scale may be approximately expressed as- Photo Scale = f / S, where f is the _______________________.
Focal length of the camera lens
Distance of the camera from the object
23.Mechanical alignment methods with tensioned wires used as the reference lines have found many applications, including dam deformation surveys.
True
False
24.Accuracies of __________________ are achievable using mechanical alignment methods.
0.1mm
0.01mm
0.001mm
25.Two kinds of mechanical plumbing are used in controlling the stability of vertical structures. They are Suspended Plumb Lines & Floating or Inverted Plumb Lines. Inverted plumb lines have an advantage over suspended plumb lines in the possibility of monitoring absolute displacements of structures with respect to deeply anchored points in the foundation rocks that may be considered as stable.
True
False
26.High precision optical plummets offer accuracy of up to _______________for precise centering, and both can be equipped with laser.
1/100,000
1/200,000
27.If two connected containers are partially filled with a liquid, then the heights h1 and h2 of the liquid in the containers are related through the hydrostatic equation h1 + P1 / (g1 r1) = h2 + P2 / (g2 r2) = constant where P is the __________________________.
Barometric pressure
Gravity
Density of the liquid
28.A plumbline and pendulum are used to establish a single __________________ reference line.
Vertical
Horizontal
29.A nadir plummet is precision centering device with a built-in automatic level for use in vertical sighting and collimation.
True
False
30.The equation dL = ( w 2 ) ( L 2 ) / ( 24 ) ( P 2 ) is for ______________________.
Tension correction
Temperature correction
Sag correction