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时间:2020-03-27
《压力分散型挡土墙支护高填土路基施工过程的受力特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第30卷第4期2013年4月公路交通科技JournalofHighwayandTransportationResearchandDevelopmentVoL30No.4Apr.2013doi:10.3969/j.issn.1002—0268.2013.04.003压力分散型挡土墙支护高填土路基施工过程的受力特征薛志超1,宋修广2,陈宝强3,牟旺4(1.山东省交通运输厅公路局,山东济南250002;2.山东大学土建与水利学院,山东济南250061;3.潍坊市公路勘察设计院,山东潍坊261061;4.潍坊市公路管理局,山东潍坊261
2、061)摘要:新研发的压力分散型悬锚式挡墙通过安装多个锚定板及对锚索施加预应力,减少了挡墙的被动变形量,提高了锚定板极限锚固力,应用效果良好,但挡墙土压力分布规律也因此发生了显著改变,对结构受力将产生显著影响。为了揭示压力分散型悬锚式挡墙土压力分布规律,结合在建工程进行了现场试验,现场埋设土压力盒、锚索测力计等监测仪器,研究分析了填土过程中压力分散性挡土墙基底压力、侧向土压力、锚定板处压力及锚索拉力的变化规律。监测结果表明:随着填土增高及锚索预应力的施加,该类型挡土墙基底压力出现外侧压力与内侧压力峰值的交替变化,即挡墙表现为先向
3、外倾后向内倾的变形趋势;挡土墙侧向土压力在施加锚索预应力前,表现为主动土压力分布模式,而施加预应力后,则表现为应力突变现象,侧向土压力明显增大,呈抛物线分布趋势;张拉顺序会影响锚索拉力值,使得锚索越靠近张拉端拉力值越大,锚定板受力越大。关键词:道路工程;受力特征;现场试验;压力分散性挡土墙;土压力中图分类号:U417.1+1文献标识码:A文章编号:1002—0268(2013)04—0011—06StressCharacteristicsofPressureDispersiveRetainingWalIforSupporting
4、High-fillingEmbankmentduringConstructionXUEZhicha01,SONGXiuguan92,CHENBaoqian93,MUWan94(1.HighwayBureauofShandongProvincialDepartmentofCommunications,JinanShandong250002,China;2.SchoolofCivilEngineering,ShandongUniversity,JinanShandong250061,China;3.WeifangHighwaySur
5、veyandDesignInstitute,WeifangShandong261061,China;4.WeifangHighwayAdministrationBureau,WeifangShandong261061,China)Abstract:Thenewdevelopedpressuredispersiveretainingwall,whichincludesseveralanchorplatesandprestressedcables,isabletoincreasetheanchorageforceandreducet
6、hepassivedeformationofretainingwall,andapplicationeffectisgood.However,thedistributionpatternofitslateralsoilpressureischangedsignificantly,andthestructurestressisalsoinfluencedsignificantly.Inordertorevealthesoilpressuredistributionpatternofpressuredispersiveretaini
7、ngwall,fieldtestisconductedbasedontheprojectunderconstruction.Withtheembeddedmonitoringinstrumentssuchasearthpressurecellsandanchorforcemeteronsite,thevariationofbasalpressure,lateralearthpressure,pressureattheanchoringplateandanchorcabletensionofthedispersivepressur
8、eretainingwallduringfiHingprocessareanalyzed.Themonitoringresultsshowthat(1)thepeakbasalpressuresintheinsideandoutsideofthisretaini
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