简介:Basedon3DBiot’sconsolidationtheoryandnonlinearDuncan-Chang’smodel,a3DFEM(finiteelementmethod)programisdevelopedconsideringthecouplingofgroundwaterseepageandsoilskeletondeformationduringexcavation.Thecomparisonbetweentheanalysisresultconsideringthevariationofwaterheaddifferenceandthatwithoutconsideringitshowsthattheporewaterpressuredistributionoftheformerisdistinctlydifferentfromthatofthelatterandthatthefoundationpitde-formationsoftheformerarelargerthanthoseofthelatter,sothattheresultwithoutconsideringthevariationofwaterheaddif-ferenceisunreliable.Thedistributionrulesofsoilhorizontalandverticaldisplacementsaroundthepitandexcessporewaterpressureareanalyzedindetailintimeandspace,whichisverysignificantforguidingundergroundengineeringconstructionandensuringenvironmentsafetyaroundthepit.
简介:Excavatingsandsandgravelonlandincombinationwithconstructingreservoirsforstoringfreshwaterisanidealapproachinatolls.Appropriateminingofgravelfromtheprogradinggravelbeachisacceptable.Diggingreefrockclosetotheedgeofthewideoceanreefflatwithoutsurfaceloosesedimentsonitorsandbeachcanbeaccepted.Excavatingsandfromsomedepthsinlagoonisascientificapproachparticularlyimportantforurbanizedatolls.However,selectingappropriatesitesforminingsandotherthanatsomedepthsinlagoonissuitabletoruralislandswithoutdensepopulations.Thesesitesincludeupdriftsideoflonggroinonthereeffiat,partlyfilledaccesschannel-port,outletofartificialchannelandlagoonmarginontheprogradingcoast.
简介:TheSecondPitofQinshihnang'sTerra-cottaArmyUndergoesExcavationBystaffreporterCHENJIANInwhatseemstohavebeenarathermegalomaniaca...
简介:CablewaysintheTibetanAreaLIYUCHUANTheinitialmethodinvolvedenclosingthestripsinwoodentubesoutfittedwithseats.Peopleweretranspo...
简介:EngineeringexcavationGIS(E2GIS)isareal-3DGISservingforgeosciencesrelatedtogeo-engineering,civilengineeringandminingengineeringbasedongeneralizedtri-prism(GTP)model.AstwoinstancesofGTPmodel,G-GTPisusedforthereal-3Dmodelingofsubsurfacegeologicalbodies,andE-GTPisusedforthereal-3Dmodelingofsubsurfaceengineeringexcavations.InthelightofthediscussionsonthefeaturesandfunctionsofE2GIS,themodelingprinciplesofG-GTPandE-GTPareintroduced.Thetwomodelscoupletogetherseamlesslytoformanintegralmodelforsubsurfacespatialobjectsincludingbothgeologicalbodiesandexcavations.Anobject-orientedintegralreal-3Ddatamodelandintegralspatialtopologicalrelationsarediscussed.
简介:作为爆炸的最批评的公共危险,地面颤动从社区收到了许多注意。压制颤动的确定的国家标准在结构上影响的许多国家,而是人的安全上的一个接受世界的爆炸颤动标准仍然失踪。以便从爆炸评估人的反应到颤动在中国的一个大规模岩石斜坡的挖掘,这研究试图建议一个修订标准。颤动频率被介绍改进存在单个因素(山峰粒子速度)标准由矿(USBM)的美国局推荐了。新标准的可行性基于领域颤动监视和人的反应的调查被检查。而且,人上的空气过压或强风效果也被讨论了。结果显示影响的全部地区能被划分成三subzones:严重烦恼,轻烦恼并且感觉地区根据修订安全标准。建筑公司和本地居民在这个影响度评价以后提供了积极评价,它显示介绍标准对评估人的反应到附近的强风合适。不过,在它能是以前,这个特定的标准需要更多的领域测试和确认
简介:Themountainousareas(mountain,plateauandhillyarea)covermorethan85%ofthetotallandterritoryofChina.Natureandhumanityinverymountainousareahasitsowngeographiccharacteristics.IntheprocessofindustrializationandurbanizationinChina,realizingthesustainabledevelopmentofthemountainousareas,optimizingman-landsystem,andadoptingandcontinuouslydevelopingcorrespondingeconomicmodesofthemountainousareaswithmulti-functionsofeconomy,ecology,cultureandsocietytocharacterizeproductioncontent,modeofproduction,modeofoperationisnotonlyhelpfultoeconomy,societyandecologicalvalueandisofgreataestheticvalue,butalsosolvethetechnologicalproblemsofthesubjectofstartingundertakingtofinallytransformtheregionalresourceadvantageofthemountainousareaintotheadvantageofcapitalandtechnologyforeconomicdevelopmentandtogetridofthecontradictionbetweenunderdevelopedeconomyandabundantresources.ThispapertakestheThreeGorgesReservoir(TGR)areaforexampletoshowthatit'sofgreatpracticalandtheoreticalsignificancetodevelop'FiveTypesofAgriculture'andtooptimizeecoenvironment,industrialstructure,departmentstructure,regionaldistribution,varietystructureandqualitystructure.
简介:Apracticalmethodforvisualizingfloodareaandevaluatingdamageispresented,whichconsistsoftwotechnicalapproaches:self-programmingandadaptingcommercialGISplatforms.Thelow-costandeasy-to-useGIS-Basedmodeldevelopedbyself-programmingcanmeetcurrentrequirementsofmostlocalauthorities,especiallyindevelopingcountries.Inthismodel,twocases,non-sourcefloodandsourceflood,aredistinguishedandtheSeed-spreadalgorithmsuitableforsource-floodisdiscussed;Theflooddamageisassessedbyoverlayingthefloodarearangewiththematicmapsandotherrelatedsocialandeconomicdata.andallthematicmapsareconvertedtorasterformatbeforeoverlayanalysis.Twomeasuresaretakentoimprovetheoperationefficiencyofspeedseed-spreadalgorithm.TheaccuracyofthemodelmainlydependsontheresolutionandprecisionoftheDEMdata,andtheaccuracyofregisteringallrasterlayersandthequalityofattributedata.
简介:It'saNo-ManbutColorful Area¥YANGYICHOUThehinterlandoftheQinghai-TibetPlateauiscomposedoftheKunlunandKarakorummountainsaswella...
简介:Five Scenic Spots In the Qamdo AreaFiveScenicSpotsIntheQamdoArea¥LIUGUANGXUEQamdoCityhasbeenbuiltforsome270years.TheQamdoarea...