The durability of silty clay embankments is partially controlled by the moisture migration, which depends on soil hydraulic properties. This paper presents an experimental study of hydraulic properties of compacted bi...The durability of silty clay embankments is partially controlled by the moisture migration, which depends on soil hydraulic properties. This paper presents an experimental study of hydraulic properties of compacted binary silty clay. Specimens with different mixing ratios and dry densities were prepared. Scanning electron microscopy and mercury intrusion porosimetry were used to characterise the microstructure of silty clay. Thereafter, falling-head permeability tests and water retention tests were conducted to study the permeability and water retention property, respectively. The results demonstrate that clay particles are dispersed and show preferred arrangements after compaction when the clay content is 100%. As the clay content decreases, the arrangement of clay particles is gradually disturbed because of the existence of silt particles, causing the formation of large pores around silt particles. When the dry density increases, the pores around silt particles significantly decrease. Moreover, the permeability of silty clay decreases but the water retention capacity increases with increasing clay content and dry density. This is because the silty clay with larger clay content and dry density has fewer large pores, which greatly restrains the flow of water. Both the permeability and water retention property of silty clay can be predicted from pore size distribution parameters.展开更多
相比于非相干消色散,相干消色散具有色散消除更彻底、可保留原始数据相位、时间分辨率信息等优势,但同时具有运算量大、数据处理耗时长等问题。为实现脉冲星基带数据相干消色散处理,对数据处理流程进行加速,开发一种以DSPSR(digital sig...相比于非相干消色散,相干消色散具有色散消除更彻底、可保留原始数据相位、时间分辨率信息等优势,但同时具有运算量大、数据处理耗时长等问题。为实现脉冲星基带数据相干消色散处理,对数据处理流程进行加速,开发一种以DSPSR(digital signal processing software for pulsar)和GPU(graphics processing unit)为数据处理核心的脉冲星数据处理技术。利用高速共享内存实现对环形缓存区两路极化基带数据的读取,结合图形处理器高性能计算技术,使用DSPSR对基带数据进行相干消色散处理。数据处理结果表明,相比于多线程非相干消色散系统,此数据处理技术在数据处理速度方面具有更好的优越性,并可获得更精细的脉冲轮廓。展开更多
基金Projects(51908069, 51908073, 51838001, 51878070) supported by the National Natural Science Foundation of ChinaProject(2019SK2171) supported by the Key Research and Development Program of Hunan Province, China+2 种基金Project(kfj190605) supported by the Open Fund of Engineering Laboratory of Spatial Information Technology of Highway Geological Disaster Early Warning in Hunan Province (Changsha University of Science & Technology),ChinaProject(2019IC04) supported by the Double First-Class Scientific Research International Cooperation Expansion Project of Changsha University of Science & Technology, ChinaProject(kq1905043) supported by the Training Program for Excellent Young Innovators of Changsha, China。
文摘The durability of silty clay embankments is partially controlled by the moisture migration, which depends on soil hydraulic properties. This paper presents an experimental study of hydraulic properties of compacted binary silty clay. Specimens with different mixing ratios and dry densities were prepared. Scanning electron microscopy and mercury intrusion porosimetry were used to characterise the microstructure of silty clay. Thereafter, falling-head permeability tests and water retention tests were conducted to study the permeability and water retention property, respectively. The results demonstrate that clay particles are dispersed and show preferred arrangements after compaction when the clay content is 100%. As the clay content decreases, the arrangement of clay particles is gradually disturbed because of the existence of silt particles, causing the formation of large pores around silt particles. When the dry density increases, the pores around silt particles significantly decrease. Moreover, the permeability of silty clay decreases but the water retention capacity increases with increasing clay content and dry density. This is because the silty clay with larger clay content and dry density has fewer large pores, which greatly restrains the flow of water. Both the permeability and water retention property of silty clay can be predicted from pore size distribution parameters.
文摘相比于非相干消色散,相干消色散具有色散消除更彻底、可保留原始数据相位、时间分辨率信息等优势,但同时具有运算量大、数据处理耗时长等问题。为实现脉冲星基带数据相干消色散处理,对数据处理流程进行加速,开发一种以DSPSR(digital signal processing software for pulsar)和GPU(graphics processing unit)为数据处理核心的脉冲星数据处理技术。利用高速共享内存实现对环形缓存区两路极化基带数据的读取,结合图形处理器高性能计算技术,使用DSPSR对基带数据进行相干消色散处理。数据处理结果表明,相比于多线程非相干消色散系统,此数据处理技术在数据处理速度方面具有更好的优越性,并可获得更精细的脉冲轮廓。
