By Myrvoll, F.
A huge cross-section of papers from the sixth Internation Symposium FMGM in Oslo September 2003 detailing the newest advancements in geomechanical box size know-how and strategies. Taking in quite a lot of real-world purposes from tunnels to off-shore constructions, those papers examine either theoretical and functional facets of the topic and determine performances within the box, offering a wealth of data for pros and researchers attracted to box measurements, soil and granular mechanics, engineering, geology or development
Read or Download Field Measurements in Geomechanics: Proceedings of the 6th International Symposium, Oslo, Norway, 23-26 September 2003 PDF
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Extra resources for Field Measurements in Geomechanics: Proceedings of the 6th International Symposium, Oslo, Norway, 23-26 September 2003
Sample text
Concrete was placed through a 200 mm tremie pipe that was inserted through holes in the steel plates attached to the O-cells. The tremie pipe was gradually withdrawn as the level of concrete rose while maintaining a head of concrete above the bottom of the pipe. During concrete placement, the tremie pipe tip was maintained below the top of the fresh concrete in order to avoid damage to the instrumentation by free-falling concrete. 6 ANALYSIS AND TEST RESULTS A three-stage loading procedure was generally followed in the multi-level O-cell test.
Shaft and O-cell displacements during the load test were measured using a system of telltales, dial gauges, and linear vibrating wire displacement transducers (LVWDT). A telltale runs through a conduit from the ground surface to the top of the O-cell and records the upward displacement of the top of the O-cell. At each strain gauge level, sister bar strain gauges were placed in pairs. To obtain strain measurements at each level the two strain gauge results were averaged. 5 m supporting piles with a wall thickness of 12 mm.
Data analysis suggested to foresee other instrument to control the horizontal displacement of the dam body. For that reason the system was upgraded with two new direct pendulum lines: the first one installed in a block as close as possible to the dam axis (the central block was not available for instrument installation due to the presence of the spillway gates), the other one in a symmetric position compared to the existing one. Geodetical survey, according to the new technologies available, were examined.
