The properties of hydraulic filled coal ash

• Main Authors: LIN TZE-KAI, 林資凱
• Other Authors: HWANG JIN-HUNG
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/92863328322446364952

碩士 === 國立中央大學 === 土木工程研究所 === 89 === ABSTRACT In this paper, a series of in-situ explorations and samplings were carried out in a coal ash deposit at central Taiwan. The deposit was formed with coal ash, a surplus of thermal power plant, by hydraulic filling. Laboratory physical, chemical and cyclic triaxial tests were then conducted to obtain the basic properties of the coal ash and its cyclic resistance. The in-situ explorations included the standard penetration test, seismic cone penetration test and cross- hole seismic survey. The in-situ samplings consisted of tube sampling during boring and block sampling in a pit. Test samples comprised undisturbed samples and remolded samples. It was found that the in-situ coal ash is a high void ratio, high water content, high fines content, low unit weight, low specific gravity, non-plastic, cohesionless, spherical shaped, granular soil. Although the in-situ coal ash is soft and non-plastic, its cyclic resistance is significantly higher than those of the hydraulic filled sandy soils in the same general area. This may be attributed to its high fines content and fine-grained size. Besides, the influences of many factors on the cyclic resistance of the coal ash were summarized, and the characteristics of excess pore pressure generation and re-consolidation after liquefaction were also presented. These test data may provide a valuable base for aseismic design in a foundation soil with coal ash. Key words: coal ash, hydraulic filled, cyclic resistance, excess pore water pressure, re-consolidation, dynamic property.