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1、第36卷第2期兰州理工大学学报Vol.36No.22010年4月JournalofLanzhouUniversityofTechnologyApr.2010文章编号:1673-5196(2010)02-0098-07框架预应力锚杆支护结构中锚杆间距的设计参数1,21,2周勇,朱彦鹏(1.兰州理工大学土木工程学院,甘肃兰州730050;2.教育部西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050)摘要:基于某公路边坡加固工程实例,研究框架预应力锚杆柔性支护结构中锚杆间距设计参数对框架内力和锚杆轴力的影响
2、,讨论锚杆间距的相对最优组合问题.结果表明锚杆水平间距的小范围变化主要影响框架横梁的内力,锚杆竖向间距和第一排锚杆离坡顶的距离的小范围变化主要影响框架立柱的内力,且前两者增大时锚杆轴力从上至下都呈现先增大后减小的现象,总体上呈弓形分布.另外,考虑到支护结构的立面美观效果、经济性和锚杆承载力的合理性要求,在土质较为均匀的条件下,锚杆的水平间距、竖向间距和第一排锚杆离坡顶的距离分别取2.5、2.5、1.5m时是相对最优的.关键词:边坡工程;框架柔性支护结构;间距设计参数;最优组合中图分类号:TU432;TU470.3文献标识码:A
3、Designparametersofanchorspacinginsupportingstructurewithframedandprestressedanchors1,21,2ZHOUYong,ZHUYan-peng(1.CollegeofCivilEngineering,LanzhouUniv.ofTech.,Lanzhou730050,China;2.WesternEngineeringResearchCenterofDisasterMit-igationinCivilEngineering,MinistryofEducati
4、on,Lanzhou730050,China)Abstract:Basedonanengineeringpracticeofhighwayslopereinforcement,theinfluencesofdesignpa-rametersofanchorspacinginflexiblesupportingstructurewithframedandprestressedanchorsonthein-ternalforcesofthesupportingstructureandaxialforcesofanchorswerestu
5、died.Inaddition,therelative-lyoptimumcombinationofthespacingdesignparametersofanchorswasdiscussed,also.Theanalysisre-sultshowedthatasmallchangeinhorizontalspacingwouldhaveaninfluencemainlyontheinternalforcesofhorizontalframedbeams,andasmallchangeinverticalspacinganddist
6、anceofthefirstrowofanchorfromslopetopwouldhaveeffectmainlyontheinternalforcesofverticalframedcolumns.Whenthespac-ingincreased,theaxialforcesofanchorsinthebothcasesincreasedfirstandthendecreaseddownwarda-longtheanchor,thedistributionshapebeingofarchform.Moreover,basedo
7、ntherequirementsofaes-theticeffectofelevationofthesupportingstructure,itseconomyandbaringcapacityoftheanchor,therelativelyoptimalhorizontalspacing,verticalspacing,anddistanceofthefirstrowofanchorfromtheslopetopwouldbe2.5m,2.5mand1.5m,respectively,intheconditionofhomogen
8、eoussoil.Keywords:slopeengineering;framedflexiblesupportingstructure;spacingdesignparameters;optimumcombinatio
