Particle crushing contributes significantly to the time-dependent compression behaviors of crushable granular soils. It is also widely accepted that flooding would aggravate the breakage level of soil particles. This study aims to investigate the combined behavior. A crushable granular soil was chosen to preform one-dimensional compression tests, i.e., constant-rate of strain tests and multistage loading oedometer tests, under dry and saturated conditions. Besides, the crushing mechanism of particles was investigated by measuring the microhardness of soil particles. Furthermore, the shape characteristics (circularity, aspect ratio, roundness and solidity) of particles before and after tests were analyzed by digital image processing (DIP) method. The results show that the "isotach" behavior is observed for the tested soil in saturated condition. The compression curve, creep behavior and level of particle breakage of initially dry specimens would evolve to the same manner in which the initially saturated specimens behave. The microhardness test clearly has attributed the breakage of particles to the disaggregation of clay minerals which are the bonding materials between micro-quartz particles. This disaggregation became more severe after the moisturization of soil particles. The plastic work done to each specimen and corresponding breakage ratio are correlated by two hyperbolic functions, which define two characteristic curves for dry and saturated/flooded conditions. The results from DIP analysis indicate that the average values of shape descriptors of all the particles in one specimen would change during compression, with a larger level under saturated or flooded condition than under dry condition.
Abstract:Since the reform and openning-up, relationship between construction industry and economic market in China has had fundamental changes, and has laid good foundation for updating and reforming of domestic architectural technologies influenced by continuous increase of total market investment. In the construction process of architectural engineering project, as the basic structure of the entire building, theoretical system of construction technologies in civil engineering should be deeply studied in the future to fully satisfy strategic requirements of modern construction system, innovation of original and core technologies should be emphasized to improve civil engineering technology and construction means and play a positive role for maximum construction benefits of civil engineering, and it has great practical significance. The article has made all-round representation on authority and importance of construction technology innovation of civil engineering architecture from the global perspective, discussed and exchanged construction technology features of civil engineering in current period, continuously deepened innovation and reforming of construction technology of civil engineering to effectively facilitate improvement of natures of the building based on summary of construction experience of engineering oriented with technical innovation.
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