ForewordAccording to the requirements of Document JIANBIAO[2004]No.67 issued by the Ministry ofConstruction"Notice on Printing and Distributing 'the Development andRevision Plan of NationalEngineer Construction Standards in 2004",this standard was revised by NanjingHydraulic ResearchInstitute based on GBJ 145-90 Standard for Classification of SoilsThis standard includes five chapters.Its main technical contents include:general provisions;terms,symbols and designations:basic requirements;soil classification:simplified soil identification,classification and description.An appendix is also provided.The main revisions made in this standard are as follows:the contexts relevant to special soils areremoved.Terms.symbols and designations are added.Appendix 1 for basic designations is removed;onesubgroup fractions are increased for gravel,two subgroup fraetions are increased for sand;the plasticity chartwith the liquid limits corresponding to 10 mni depth of fall-cone penetration is removed,along with itsrelated contexts;and Appendix A:System block diagram for engineering classification ofsoils is added.The Ministry of Construction is in eharge of the administration of this standard.General Institute ofWater Resources and Hydropower Planning and Design of Ministry of Water Resources is responsible forthe routine management of this standard.Explanation of the technical content is undertaken by NanjingHydraulic Research Institute.All the relevant organizations are encouraged to obtain experience in usingthis standard,and also kindly requested to submit comments and advices whenever necessary.to the NanjingHydraulic Research Institute(Address 223 Guangzhou Road,Nanjing 210029,China for future revision.Chief DevelopmentOrganizations.Co-Development OrganizationsandChief Drafters of thisStardand:Chief Development OrganizationsNanjing Hydraulic ResearchCo-Deyelopment Organizations:China Academy of Building ResearchComprehensive Institute of Geotechnical Investigation andSurveyingBeijing Geotechnical InstituteAcademy of Railway SciencesResearch Institute of Highway of Ministry of CommunicationsGeneral Building Research Institute of China Metallurgy GroupMechanical Industry Survey and Design InstituteChina Institute of Water Resources and Hydropower Research方Yangtze River Scientific Research InstituteXi'an University of TechnologyJilin UniversityChief Drafters:FAN Mingqiao TENG YanjingWU Wei LIU YanhuaLUO MeiyunWANG YuanXIN HongboZHANG Wei WEN YanfengGONG BiweiHU ZaiqiangWANG QingTIAN Xichun and WANG Fang方住房城乡建设部信息公开方方文浏览专用方方方万文ContentsGeneral provisions'(1)2Terms,symbols and designations(22.2 Symbols..(2)2.3 Designations.......(3)3、Basic stipulations4 Soil classification5Simplified identification,classification,and description9)5.1 Simplified Identification methods95.2 Identification and classification(10)5.3 Soil description(10)001(12)14)住房城乡建Appendix ASystem block diagram forExplanation of wording in this standa浏览专用