Test Method for Determining Solar or Photopic Reflectance, Transmittance, and Absorptance of Materials Using a Large Diameter Integrating Sphere

Based on test method of numerical simulation, the bearing characteristics of large-diameter rock-socket pile with different super-thick pile caps have been analyzed, including the finite element model, Numeric Simulation of different heights of pile cap, Pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that pile cap thickness has little influence on pile bearing capacity for the thick pile cap, when thickness of pile cap increases to a certain thickness, it would not affect the settlement characteristics under the pile caps. With the increase of the thickness of cap, the pile side friction load sharing value of pile side friction decreases, while the load sharing value of pile tip load increase, and soil force under the pile cap does not change with the different thickness of pile cap. However,it is advantageous to increase cap thickness to reduce tensile stress.

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Numerical Simulation Analysis of Bearing Characteristics on Super-Large Diameter Rock Socketed Pile

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.432 ◽

2014 ◽

Vol 580-583 ◽

pp. 432-435 ◽

Cited By ~ 1

Author(s):

Cheng Zhong Gong ◽

Chun Lin He ◽

Ming Xing Zhu

Keyword(s):

Numerical Simulation ◽

Simulation Analysis ◽

Large Diameter ◽

Flow Analysis ◽

Test Method ◽

Main Stress ◽

Pile Cap ◽

Pile Caps ◽

S Curve ◽

Stress Flow

Wujiang Bridge is located on the Wujiang River in Chongqing Province in China. Based on test method of numerical simulation, the bearing characteristics of this large-diameter rock-socket pile with super-thick pile caps have been analyzed, including pile foundation load-bearing characteristics, pile-soil load sharing, and stress flow analysis of thick pile caps. The results indicated that Q-s curve of this kind of pile is approximate to linear. Under the action of ultimate load, the main load was supported by pile end résistance. And according to main stress distribution of pile cap, there is an obvious spatial truss effect phenomenon in it.

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Understanding and Mitigating Under-Deposit Corrosion in Large Diameter Crude Oil Pipelines: A Progress Report

2008 7th International Pipeline Conference, Volume 2 ◽

10.1115/ipc2008-64562 ◽

2008 ◽

Cited By ~ 1

Author(s):

T. D. Place ◽

Michael R. Holm ◽

Colin Cathrea ◽

Tom Ignacz

Keyword(s):

Bacterial Species ◽

Large Diameter ◽

Progress Report ◽

Solid Particles ◽

Test Method ◽

Internal Corrosion ◽

Factors Affecting ◽

Transmission Pipeline ◽

Emulsified Water ◽

Batch Treatment

This paper is an exploration of factors affecting internal corrosion of transmission pipeline systems (<0.5% S&W), as well as a progress report on research aimed at improving chemical mitigation of this threat in heavy oil product streams. Typical pipeline corrodents and corrodent transport mechanisms are explored. Transmission quality hydrocarbon products are shown to carry micro-emulsified water, various solid particles, solid particles with micro-attached water, and bacteria. While micro-emulsified water can be considered benign owing its ability to be transported harmlessly without accumulation; water-wetted solid particles have sufficient density to reach the pipe floor. Patterns of internal corrosion on a transmission pipeline are used to demonstrate the significance of solids accumulation leading to under-deposit corrosion. Analysis of pipeline sludge reveals significant populations of different bacterial species indicating the existence of a robust biomass capable of creating or sustaining a corrosive environment. Corrosivity testing of pipeline sludges was performed using two static autoclave coupon methods. One test method demonstrated that the addition of chemical inhibitor directly to the pipeline sludge could reduce corrosion rates as effectively as batch treatment of a clean coupon. A rotating mechanical contactor was designed and built to facilitate the blending of corrosion inhibitor with pipeline sludge under ‘like-pipe’ flow conditions, but results of sludge corrosivity testing using this device are not yet available.

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