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Q. Core-barrel samplers: single tube sampler vs. double tube sampler vs. triple tube sampler
Core barrel samplers are initially designed to sample rock. In single tube sampler, core barrel of sampler rotates and this poses the possibility of disturbing sample by shearing the sample along certain weak planes. Furthermore cored samples are subjected to erosion and disturbance by the drilling fluid.
For double tube samplers, tube samplers don't rotate with the core barrels and samplers aren't protected against the drilling fluid. Logging of samples represents difficulty for highly fractured rock. Triple core barrel fundamentallycomprises a double core barrel sampler including an addition of a stationary liner that is intended to protect the cored samples at the time of extraction. Consequently the quality sample attained from triple core barrel is the best among the 3 kinds of barrels mentioned above.
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The load from a continuous footing of 1.8 metres width, which may be considered to be a strip load of considerable length, is 180 kN/m 2 . Verify the maximum principal stress at 1.
Q. How to determine the frequency of flood? Flood frequency may be estimated preferably from flood records, if available, for a number of years or they may be based on rainfall
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Classification Based on Availability: Forest departments categorized timbers based on the availability as X=Most common. 1415 m 3 or more per year Y=Common. 355 m 3 to 1415
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Question What are main disparities in design between regular precast concrete pipes and pipes used for pipe jacking ? Answer For pipes used for pipe jacking, they h
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