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ID:35133683
大小:1.59 MB
页数:78页
时间:2019-03-19
《基于黄土场地深基坑开挖变形性状研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、西安建筑科技大学硕士学位论文黄土场地深基坑开挖变形性状研究姓名:水伟厚申请学位级别:硕士专业:岩土工程指导教师:韩晓雷2001.6.1黄土场地深基坑开挖变形性状研究专业:岩土工程研究生:水伟厚导师:韩晓雷副教授摘要≮坑工程是集岩土工程和结构工程等多学科于一体的系统工程,综合性强,影响因素众多。深基坑工程不仅存在基坑本身的安全和稳定问题,而且还会因土方开挖引起的周围地层移动而可能危及相邻建筑物、地下管网和城市市政设施等。能否预测在黄土地区,的关键。而实际工程进行数值分析来研究黄土场地深基坑开挖变形性状。通过使用多种计算模型来研究基坑因土方开挖所产生的应力场和位移场规律,包
2、括均布条形荷载反作用于地基模型;半平面体在边界上受法向分布力模型;Boussinesq解在矩形面积上的二重Gauss积分模型;弹性半空间模型和Mindlin经典解的近似积分模型。编制了有限元计算程序HTJK.fgO,并通过Matlab使基坑应力及变形性状的计算结果可视化。确定出了基坑开挖后的应力场和位移场,得到了基坑边坡的侧向位移曲线和基坑周围地表沉降范围及沉降值。可供进行茎必和研究基坑开挖对周围环境造成的影响时参考。关键词:黄土深基坑变形性状地表沉降有限元L/Lk,-7。TheBehaviorofDeepExcavationInLoessFoundationSpeci
3、alty:GeoteehniealEngineeringName:ShuiWeiItouInstructor:ItanXiaoLeiSI『I、忸ⅥARYfoundationpitengineeringincoqxmatesthegeotechniqueandstruc'tureengineeringintoanorganicintegrityinfluencedbymanyfactorsNotonlyistheretheproblemofsafetyandstabilityoffoundadon,butalsotheda,geroftheneighboringbuild
4、ings,undergroundrims,municipalequipmentduetothedisplacementofstratumunderexcavation.Itisthekeytothesuccessoffoundationpitdesignthatwhetherthedisplacementofthefoundationandsurroundingsoilscanbeforecastandcontrolled.However,thebehaviorofaeepexcavationhasbeendiscussedverylittleinloessarea.T
5、hispaperaimsatresearchingt}ledisplacementbehaviorunderexcavationofrealisticengineeringinloessareabythewayofnumericalanalysis.Throughtheuseofdifferentmodels,thestressfieldanddisplacementfiledgeneratedbyearthexcavationarestudied.Themodelsincludethemodelonwhichuniformlydislributedbarloadcou
6、nteractedonfoundation;themodelwhosesemi-planeboundaryisexertedbyverticaldistributedload;doubleGaussintegralmodelintherectangularareaofBossinesssolution;themodelofelasticsemi—spaceandtheapproximateintegralmodelofMindlessclassicalsolution.writercompilesfileFEMprogramHTJK.F90andthroughtheus
7、eofMalta,thecalculatedsoluti013ofstressanddisplacementcharacterofde∞excavationisvisualable.Theslressfieldanddisplacementfieldatterexcavadonarebedeterminate,soastocalculatethelateraldisplacementclaveofthefoundationslopeandthesettlementrangeandvalueofthesurroundingground.Th
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