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ID:16149494
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页数:18页
时间:2018-08-08
《降雨及桩_隧间距对隧道_滑坡稳定性影响的试验研究_艾挥》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、降雨及桩_隧间距对隧道_滑坡稳定性影响的试验研究_艾挥降雨及桩-隧间距对隧道-滑坡稳定性*影响的试验研究艾挥1,2吴红刚2陈小云3(1.兰州交通大学,兰州730070;2.中铁西北科学研究院有限公司,兰州730000;3.中国铁道科学研究院研究生部,北京100081)摘要:目前对用抗滑桩整治边坡段隧道以及对抗滑桩工作性能的研究较多,但对降雨和桩-隧间距差异对隧道-边坡稳定的影响研究较少。为研究降雨及桩-隧间距对抗滑桩受力及隧道变形的影响,分别采160cm的埋入式抗滑桩布置于滑体主滑段,用桩-隧间距为80,通过模拟不同强度降雨,以研究降雨及桩-隧间距对隧道变形、抗滑桩
2、桩头变形的影响。试验表明:1)小雨阶段,雨水渗入浅层滑体,桩-隧间距差异对抗滑桩受力分布及桩头位移变化影响不大;2)中—大雨阶段,雨水逐渐渗入到深层滑体,动水压增大,下滑力较快增大,桩-隧间距差异对抗滑桩受力影响较大,较小的桩-隧间距,不利于坡体的稳定。3)从隧道变形曲线来看,隧道山侧应变比河侧应变要大,且桩-隧间距为80cm的隧道应变比160cm段的应变大。关键词:隧道;滑坡;降雨;模型试验;应力;应变DOI:10.13204/j.gyjz201702020———————————————————————————————————————————————EXPERIM
3、ENTALSTUDYOFTHEINFLUENCEOFRAINFALLANDPILE-TUNNELSPACINGONTHETUNNELSLOPESTABILITY2AiHui1,WuHonggang2ChenXiaoyun3(1.LanzhouJiaotongUniversity,Lanzhou730070,China;2.ChinaNorthwestResearchInstituteCo.Ltd,CREC,Lanzhou730000,China;3.PostgraduateDepartmentofChinaAcademyofRailwaySciences,Beiji
4、ng100081,China)Abstract:Atpresent,therearemanyresearchesonthetreatmentoftheslopetunnelwiththeanti-slidepilesandthebehaviorofanti-slidepiles,buttheresearchoninfluencespacingoftherainfallandthedifferencespacingbetweenthepileandthetunnelonthestabilityofthetunnelisless.Inordertostudytheinf
5、luenceofrainfallandpiletunnelspacingontheforceontheanti-slidepileandthedeformationoftunnel,thearrangementofanti-slidepilewasappliedwithpile-tunnelspacingof80cmand160cm,arrangedonmainslidingsectionoftheslidingbody.Thestudyshowed:1)Atthestageoflightrain,theraininfiltratedintoshallowslide
6、body,thedifferencespile-tunnelspacinghadlesseffectonslidingpilestressdistributionandchangeindisplacementofpilehead;2)Atthestageofmoderateraintoheavyrainstage,———————————————————————————————————————————————theraingraduallyinfiltratedintodeepslidingbody,thedynamicwaterpressureincreased,t
7、heslidingforceincreasedrapidly,andthedifferencespacingbetweenpileandtunnelhadgreatinfluenceontheforceofslidingpile.Therewasarapiderchangeinthetopdisplacementfortheanti-slidingpilewithsmallertunnelpile-tunnelspacing,asmallpile-tunnelspacingwasunfavorabletotheslopestability;3)Thestrain
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