Modulus of Subgrade Reaction for Laterally Loaded Piles in Multiple Layered Foundation

-According to the field test data of laterally loaded steel piles at home and abroad,an empiri-cal formula for evaluating the modulus of subgrade reaction under static load in layered soil is proposed.The suggested formula takes account of not only non-linearity of K_s with the depth but also its variationwith the load.It is shown that the computed bending moments along the pile shaft and the deflection atthe pile top are consistent with the measured ones.     

国家1：50000基础地理信息数据库更新工程

“十一五”期间,国家测绘地理信息局组织开展了全国1：50000基础地理信息数据库建设,充分利用与整合了建国以来的主要测图成果,在数据采集与生产中全面使用了国产化软件,较好地解决了数字化技术下的地理信息多源数据整合、海量数据管理、数据质量控制等诸多技术难题。建成了全国1：50000核心地形要素数据库、DEM数据库、全国10m卫星影像和局部1m航空影像数据库等,有效缓解了用户对全国范围高精度基础地理数据的需求,在国民经济建设和信息化中产生了巨大的应用效益。     

Effect of Sediment Motion Patterns on Sorption of Cadmium Ions by Sediment Particles

I.INTRODUCTIONThefateofmanytraceheavymetalsinnaturalwatersis,toalargeextent,controlledbysorptionprocessesandthedynamicsoftheparticlesthemselves.Thepotentialinfluencesofenvironmentalvariablessuchastemperature,CaZ+,Na+andCI--,dissolvedorganiccarbonandPHvaluesontraceheavymetalpartitioninghavebeenwidelyinvestigated.Forexample,StumnandMorgan(1981)suggestthattheextentofsorptionvariespositivelywithtemperature.Itfollowsthatdecreasedsorptionmightbeexpectedatlowtemperatures,e.g.duringwintermont…