浅析砂土的液化判别及其影响因素.docx

浅析砂土的液化判别及其影响因素摘要：简述了砂土液化的危害从内因（土的颗粒组成、密度、埋深条件、地下水位、沉积环境和地质历史等）和外因（地震动强度和持续时间等）分析了砂土液化的机理及影响因素。采用标准贯入试验判别液化时应先进行初判有液化可能性时再进行详判通过工程实例论证了用标准贯入试验公式详判时应采用场地整平后的地面标高计算地下水深度按设计基准期内年平均最高水位或近期内年最高水位计算并分析了标准贯入试验操作误差对锤击数准确性的影响。提出当同场地的液化等级不一致时应进行液化分区结合具体情况采取抗液化措施以节省造价保证工程安全。关键词：砂土液化；标准贯入试验；地下水；液化分区；处理措施SANDLIQUEFACTIONANDITSINFLUENTIALFACTORSZHANGYahua12LIUFei23*DULixin41.SurveyofProfessionalCollegeBeijingUrbanConstructionExploration&SurveyingDesignResearchInstituteCo.Ltd.Beijing100101；2.StateKeyLaboratoryBreedingBaseofNuclearResourcesandEnvironmentEastChinaInstituteofTechnologyNanchang330013；3.InstituteofGeologyChineseAcademyofGeologicalSciencesBeijing100037；4.ProjectManagementDepartmentCECEOLiuHeTalroadEnvironmentalTechnologyCo.Ltd.Beijing100085Abstract：Thispaperdescribestheliquefactionhazardsfrominternalfactors（soilparticlecompositiondensitydepthconditionsgroundwatersedimentaryenvironmentsandgeologicalhistoryetc.）andexternal（groundmotionintensityanddurationetc.）analysisofsandliquefactionThemechanismandinfluencefactors.Standardpenetrationtestdiscriminantliquefactionshouldbetheinitialimpressionthereisthepossibilityoffurtherdetailedliquefactionnegotiationsthroughtheengineeringexampledemonstratedtheuseofstandardpenetrationtestformuladetailednegotiationsthevenueshouldbeusedafterlevelingthegroundelevationcalculatedaccordingtothedesignwaterdepthofthebaseperiodtheaveragehighestwaterlevelorthehighestwaterlevelcalculatedinthenearfutureandanalyzestheoperationofstandardpenetrationtestnumberoferrorsontheaccuracyofthehammer.Raisedthelevelofinconsistencywiththesiteofliquefactionandliquefactionzoningshouldbecarriedoutcombinedwithspecificanti-liquefactionmeasurestakentosavecostandensureconstructionsafety.Keywords：S