采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性...采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性与强度UCS的影响。模型试验研究发现,通过多层互剪搅拌能够根除地表冒浆、防止糊钻抱钻、提高固化材料利用率。18组模型试验结果阐明搅拌桩在T-E-UCS之间存在固有关联,并揭示出机械参数、输出能量与桩身强度之间的本质关系。提供的计算方法可以定性指导选取合理的工艺参数,实现桩身设计强度目标。作为重要工艺因素,内外钻杆转速比RN与桩身强度试验曲线存在极值点,建议在工程中将1.80~2.20作为获取桩身峰值强度的最优RN值域。CS-DSM工法应用的系列研究结果为高质量搅拌桩工艺控制原则和质量保障体系提供了试验依据。展开更多
In this study,a novel irreversible cyclic model of a capacitive mixing blue heat engine mainly consisting of super capacitors,charging and discharging circuits,a heat source,as well as two water sources with given sal...In this study,a novel irreversible cyclic model of a capacitive mixing blue heat engine mainly consisting of super capacitors,charging and discharging circuits,a heat source,as well as two water sources with given salt concentrations is established for harvesting salinity gradient energy and waste heat.Additionally,the effects of the charging voltage and ratio of the minimum to maximum surface electric charge density on the thermodynamic efficiency and power output of the cycle are discussed.The maximum power output of the cycle is calculated.The optimized ranges of efficiency and power output as well as the temperatures of two isothermal processes are determined.It is established that during the isoelectric quantity process,there is not only an increase in thermal voltage owing to the temperature difference,but also an increase in concentration voltage owing to the salinity gradient.Consequently,the blue heat engine can obtain higher energy conversion efficiency than a conventional heat engine.When the temperature ratio of the heat source to the heat sink is 1.233,the maximum efficiency can reach approximately36%.The results obtained can promote the application of capacitive mixing technology in real life,reducing the consumption of fossil fuels.展开更多
文摘采用模型试验方法,对多层互剪搅拌桩工法(contra-rotational shear deep soil mixing,简称CS-DSM工法)的工艺因素进行了试验研究,探索了水泥掺量、单位桩长搅拌次数T、单位体积搅拌能量E以及内外钻杆转速比RN等工艺因素对搅拌桩均匀性与强度UCS的影响。模型试验研究发现,通过多层互剪搅拌能够根除地表冒浆、防止糊钻抱钻、提高固化材料利用率。18组模型试验结果阐明搅拌桩在T-E-UCS之间存在固有关联,并揭示出机械参数、输出能量与桩身强度之间的本质关系。提供的计算方法可以定性指导选取合理的工艺参数,实现桩身设计强度目标。作为重要工艺因素,内外钻杆转速比RN与桩身强度试验曲线存在极值点,建议在工程中将1.80~2.20作为获取桩身峰值强度的最优RN值域。CS-DSM工法应用的系列研究结果为高质量搅拌桩工艺控制原则和质量保障体系提供了试验依据。
基金supported by the National Natural Science Foundation of China(Grant No.51876181)。
文摘In this study,a novel irreversible cyclic model of a capacitive mixing blue heat engine mainly consisting of super capacitors,charging and discharging circuits,a heat source,as well as two water sources with given salt concentrations is established for harvesting salinity gradient energy and waste heat.Additionally,the effects of the charging voltage and ratio of the minimum to maximum surface electric charge density on the thermodynamic efficiency and power output of the cycle are discussed.The maximum power output of the cycle is calculated.The optimized ranges of efficiency and power output as well as the temperatures of two isothermal processes are determined.It is established that during the isoelectric quantity process,there is not only an increase in thermal voltage owing to the temperature difference,but also an increase in concentration voltage owing to the salinity gradient.Consequently,the blue heat engine can obtain higher energy conversion efficiency than a conventional heat engine.When the temperature ratio of the heat source to the heat sink is 1.233,the maximum efficiency can reach approximately36%.The results obtained can promote the application of capacitive mixing technology in real life,reducing the consumption of fossil fuels.
