为研究长螺旋压灌桩湿作业下水泥浆液的渗透特性,以某桩-粉质黏土过渡带为研究对象,采用扫描电子显微镜技术对地下水位以下粉质黏土层中的水泥浆液渗透区孔隙结构进行定性和定量分析,借助Image-Pro Plus (IPP)及地理信息系统(GIS)软件...为研究长螺旋压灌桩湿作业下水泥浆液的渗透特性,以某桩-粉质黏土过渡带为研究对象,采用扫描电子显微镜技术对地下水位以下粉质黏土层中的水泥浆液渗透区孔隙结构进行定性和定量分析,借助Image-Pro Plus (IPP)及地理信息系统(GIS)软件分析水泥浆液渗透区域的平均渗透距离、孔隙率、孔隙定向性及孔隙分形维数随深度增大的变化规律.结果表明:随着渗透区深度增加,水泥浆液渗入桩侧土体的平均距离增大,水泥水化产物对孔隙的充填作用增强,纤维状水化产物逐渐发育,胶结形成的空间网状结构范围增大;并且随着渗透区深度增加,桩侧土体孔隙率减小,小孔隙数量增加,大孔隙面积减小,孔隙定向性减弱,微观结构更加复杂.展开更多
Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its s...Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its system will directly affect the success or failure of the whole project. Aiming at the problems such as low flood control standard of a reservoir's homogeneous dam, large-area swamping of downstream dam slope, local water and sand leakage of the dam body, according to the results of core drilling sampling and safety appraisal analysis, combined with the dam's disease risk status and dam type structure, the risk removal and reinforcement scheme combining 0.7m increase in dam crest thickness with backfilling clay of drift-grab casing wells is optimized.展开更多
This paper proposes a Shared Buffer Memory ATM Access Switch . The switches have significant benefits over Crossbar or Bus Based switches because its output buffer memories are shared by all the switch output ports an...This paper proposes a Shared Buffer Memory ATM Access Switch . The switches have significant benefits over Crossbar or Bus Based switches because its output buffer memories are shared by all the switch output ports and are allotted to one particular output port as the occasion demands. As Buffer allocation schemes in the ATM Switches is Partial Sharing, it is trade-off between Complete Sharing and Dedicated Allocation. In addition, the queuing structures used in the shared memory are independent of both the data path through the switch and the cell scheduling mechanism. The method for queue management is simple and effective.展开更多
文摘为研究长螺旋压灌桩湿作业下水泥浆液的渗透特性,以某桩-粉质黏土过渡带为研究对象,采用扫描电子显微镜技术对地下水位以下粉质黏土层中的水泥浆液渗透区孔隙结构进行定性和定量分析,借助Image-Pro Plus (IPP)及地理信息系统(GIS)软件分析水泥浆液渗透区域的平均渗透距离、孔隙率、孔隙定向性及孔隙分形维数随深度增大的变化规律.结果表明:随着渗透区深度增加,水泥浆液渗入桩侧土体的平均距离增大,水泥水化产物对孔隙的充填作用增强,纤维状水化产物逐渐发育,胶结形成的空间网状结构范围增大;并且随着渗透区深度增加,桩侧土体孔隙率减小,小孔隙数量增加,大孔隙面积减小,孔隙定向性减弱,微观结构更加复杂.
文摘Anti-seepage scheme is the most critical problem in the design and construction of earth-rock dam project. It plays a decisive role in whether the whole reservoir dam can effectively retain water. The quality of its system will directly affect the success or failure of the whole project. Aiming at the problems such as low flood control standard of a reservoir's homogeneous dam, large-area swamping of downstream dam slope, local water and sand leakage of the dam body, according to the results of core drilling sampling and safety appraisal analysis, combined with the dam's disease risk status and dam type structure, the risk removal and reinforcement scheme combining 0.7m increase in dam crest thickness with backfilling clay of drift-grab casing wells is optimized.
文摘This paper proposes a Shared Buffer Memory ATM Access Switch . The switches have significant benefits over Crossbar or Bus Based switches because its output buffer memories are shared by all the switch output ports and are allotted to one particular output port as the occasion demands. As Buffer allocation schemes in the ATM Switches is Partial Sharing, it is trade-off between Complete Sharing and Dedicated Allocation. In addition, the queuing structures used in the shared memory are independent of both the data path through the switch and the cell scheduling mechanism. The method for queue management is simple and effective.
