隧道塌方

JournalofEngineeringGeology　　工程地质学报　　1004-9665/2008/16(6)20806207　

公路隧道特大塌方成因分析及综合处治方法研究

李志厚

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3

　杨晓华　来弘鹏　晏长根

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(①长安大学公路学院　西安　710064)

(②云南省公路规划勘察设计院　昆明　650011)

摘　要　结合元磨高速公路大风垭口隧道工程在施工过程中下行线,段位于断层突泥富水带且塌方发生前曾发生涌水、塌方,措施,综合监测和评判结果表明,,,有关应力,证明处治措施不仅理论上可靠,。关键词　中图分类号:U452.1+1　　文献标识码:A

ACASESTUDYONTHECAUSEANDTREATMENTOFHUGECOLLAPSEOFHIGHWAYTUNNELDURINGCONSTRUCTION

LIZhihou

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　YANGXiaohua　LAIFengpeng　YANChanggen

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(①HighwaySchoolofChang′anUniversity,Xi′an　710064)

(②YunnanHighwayPlanningProspectingandDesignInstitute,Kunming　650011)

Abstract　Duringconstruction,ahugecollapseoccurredbetweenthedownlinesfromK225toK283oftheFengy2akoutunnelofYuanmohighwayinYunnanProvince.Thispaperanalysesthereasonsforthecauseofthehugecol2lapse.Itisfoundthatthecollapsewasduetothesectionlocatedatafaultzonewithrichgroundwaterandslurryof2tengushing.Thepaperprovidesthetreatmentmeasuresincludingsurfacetreating,undergroundtreatinganddrain2ageinthecollapsedtunnel.Monitoredresultsshowedthatethestressanddeformationofthepreliminarybracingandsecondliningofthetunnelcrosssectionhadnochange,whichindicatethattheforceanddeformationwerebe2comingstable,andthechangewaswithinthelimits.Themonitoredresultsalsoshowedthatthetreatmentswerenotonlyreliableintheory,butalsosoundinpractice,andcanbeagoodguideandreferenceforthetreatmentofsimilarhighwaytunnelcollapses.

Keywords　Highwaytunnel,Hugecollapse,Treatingmeasures,Fault,Groundwater,Slurry

1引　言

公路隧道作为高等级公路快速发展不可或缺的

地下工程,在世界各国尤其是发达国家得到了广泛

应用。我国公路隧道建设近来取得了举世瞩目的成绩,但是,由于起步较晚,相关技术积累还处于初步阶段,加之公路隧道本身开挖断面大、扁担状的特

3收稿日期:2008-01-21;收到修改稿日期:2008-08-27.

第一作者简介:李志厚,主要从事隧道及地下工程、岩土工程等专业领域的勘察设计和科研工作.Email:xiaohuay@126.com