Static liquefaction is often considered as the most catastrophic mechanism due to the fact that static liquefaction failures occur without warning. Pond ash, a byproduct from coal-fired power plants, is dumped into ash ponds, which possess a risk of liquefaction due to cyclic or static loading. In this present study, the effects of confining pressure and bentonite content on the static liquefaction of pond ash have been explored. The materials were tested at their compacted maximum dry densities and optimum moisture contents. Strain-controlled static consolidated undrained triaxial tests have been carried out on pond ash–bentonite samples (0–20% @5% increment of bentonite) at varying confining pressures (50, 100, and 150 kPa), at 0.8 mm/min rate of loading. Firstly, the pond ash sample mixed with bentonite showed a better friction angle and high cohesion. Secondly, heavy compacted pond ash samples are less susceptible to static liquefaction. Thirdly, the excess pore water builds up at a faster rate for the pond ash sample as compared to the pond ash–bentonite mixture. Finally, it may be concluded that bentonite content increases the static liquefaction resistance of pond ash.

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Feasibility Studies of Static Liquefaction Susceptibility of Pond Ash Treated with Bentonite

  • Nirban De,
  • Vamsi Alla,
  • G Suneel Kumar,
  • Rabi Narayan Behera

摘要

Static liquefaction is often considered as the most catastrophic mechanism due to the fact that static liquefaction failures occur without warning. Pond ash, a byproduct from coal-fired power plants, is dumped into ash ponds, which possess a risk of liquefaction due to cyclic or static loading. In this present study, the effects of confining pressure and bentonite content on the static liquefaction of pond ash have been explored. The materials were tested at their compacted maximum dry densities and optimum moisture contents. Strain-controlled static consolidated undrained triaxial tests have been carried out on pond ash–bentonite samples (0–20% @5% increment of bentonite) at varying confining pressures (50, 100, and 150 kPa), at 0.8 mm/min rate of loading. Firstly, the pond ash sample mixed with bentonite showed a better friction angle and high cohesion. Secondly, heavy compacted pond ash samples are less susceptible to static liquefaction. Thirdly, the excess pore water builds up at a faster rate for the pond ash sample as compared to the pond ash–bentonite mixture. Finally, it may be concluded that bentonite content increases the static liquefaction resistance of pond ash.