基于ANSYS的土石壩三維非線性有限元計算方法研究及實現.pdf

1、⑧中國近代第一所大學FOUNDEDIN1895天畢大謦TIANJINUNIVERSITY碩士學位論文●學科專業(yè)：作者姓名：指導教師：天津大學研究生院2004年12月ABSTRACTRockfilldamisanoldtypeofdam，anditisthehighestdamintheworldofbeenconstructedIthastheadvantageofeasytoconstruction，lowercostandtheca

2、pabilitytofitforcomplexgeologicsetting，andthesemakeittothedominanttypeofdamIntheolddays，engineersontystudytheseepageandstabilizationofthedam，butnowadays，thestressanddisplacementcomputebecomingnecessarywiththeheightincrea

3、singofdamThemosteffectiveandaccuratemeasureofstudystressanddisplacementisfiniteelementmethod(FEM)，andANSYSisagoodFEMprogrammerSOthisarticlemakeANSYSinfacttocomputerockfilldamthroughits’parameterdesignlanguageThemostimpor

4、tantanddifficultythinginFEManalysisofrockfilldamisthesimulationofconstitutiverelation，butthereisnoappropriatemodelinANSYS，SOthisarticlemakeuseofANSYSParameterDesignLangnage(APDL)toperformDuncan—ChangE—BmodelinitIncourseo

5、fprogramming，the‘killandactive’’functionmoduleisusedtosimulatethereclamationprocessofdam：Firstly，inordertochoosethefunctionofelasticmodulus，wemustdecidetheconditionofloadingorunloadingofeverydamelementthroughtheprescript

6、iveloadingandunloadingfunctionduetotheresultofthepreviousloadstepSecondlyweshouldmodifythestiffnessmatrixofeveryelementbyusingofthenewdataofelasticmodulusandbulkmodulusinthisloadsteptosimulatetheconstitutiverelationofDun

7、canChangE—BmodelLastlywecomputethemodelinANSYSthroughits’nonlinearequmionsolverBeforethefinalresultistobereceived，aposttreatmentprogrammerhasbeendesignedtOamendthedisplacementofdamtoaccordwithengineerComparingtheresultof

8、thisprogrammerwithexperimentationwecanseethattheyarecoincidence，andthisprogrammerhasllighefficiencyandprecisionInaddition，throughaexampleofa100meterheightrockfilldam，wecanseethatthemaximumverticaldisplacementinconditiono

9、fconstructingperiodisO51percentofdarnheightanditlocatedinthemiddleorthirdheightofdam，andtheconditionofoperatingperiodisassameasconstructingbutits’maximumdisplacementis053percentofdamheightFromtheexample，wearriveataconclu

10、sionthatthenumericalvalueisappropriateandthedistributingtrendofresultisreasonableInthelastpartofthisarticle，weCa／TythroughathreedimensionFEManalysisonGuanyinyanmixeddambythisprogrammerandgetsomeusefulresultforprojectplan