2013年4月上第42卷第7期
DO:10. 7672/sgjs2013070089
施工技术
CONSTRUCTIONTECHNOLOGY
软岩偏压隧道洞口段变形破坏机理及防治措施
符银昌"，赵诗茹”，陈志超”，高义*(1.中交一公局海威工程建设有限公司，北京101119：
2.潮南省国土资源规划院，湖南长沙410007；3.中国地质大学（武汉）工程学院，潮北式汉430074；
4.山东石大科技石化有限公司，山东日熙
276800）
【摘要】在现场观察和监测的基础上，分析了土公龄隧道润口段大变形的特点。根据隧道的地质、地形条件及施工工艺特点，分析了该段隧道的变形被坏机理。结果表明，暨道润口段大变形的产生是多种因素共同作用的结果，各因素既对隧道稳定性产生直接影响，又通过相互作用形成整体效应，加速了衬确的变形破坏，极大缩短了大变形的
产生过程。结合研究成果，提出了针对该大变形段的防治措施，监测结果证明，该措施效果良好。【关键词】隧道工程；软岩；偏压；洞口段；变形；防治措施
【中图分类号】TU74;U459.2
【文献标识码】A
[文章编号】1002-8498(2013)07-0089-04
Mechanism and Treatment of theDeformationand Failure of
Tunnel Opening in Soft Rock with Uneven Pressure
Fu Yinchang',Zhao Shiru’Chen Zhichao', Gao Yi
(1. Highmay Engineering Co, ,Lud. ,CCCC First Highsay Engineering Bureau,Bejing101119,Ching;
2. Hu'nan Planning Institute of land and Resources, Changsha, Hu'nan410007,China; 3. Faculty of Engineering, Ching Unitersity of Geosciences, Wuhan, Hubei 430074, China; 4. Shandong Star Science & Technology Petrochemical Co. ,Lad. ,Rizhao, Shandong 276800,Chine)
Abstract: The features of the large deformation occurred at the opening of the Tugongling Tunnel were analysed on the basis of field observation and monitoring measurement. The mechanism of deformation and failure were analyzed, considering the geological condition, the topography condition and construction characteristics of the tunnel. The result shows that the large deformation of the tunnel opening is caused by a combination of factors. The factors not only directly impact the stability of the tunnel, but also accelerate the deformation and destruction of the tunnel lining through interactions among each other, which significantly shortens the procedure of the large deformation development. According to the research result, measures to prevent and control the development of large deformation at tunnel openings were proposed.Monitoring results show that effect of the proposed measures function was good.
Key words: tunnels; soft rock; uneven pressure; tunnel opening; deformation; prevention and controlmeasures
工程概况
在建土公岭隧道全长1014m，洞轴线走向方位角约240°~260°，设计速度80km/h。隧址区位于扬子克拉通北缘和秦岭一大别造山带的交接部位，地形上为低山斜坡地貌，受多期次、多阶段的变质作用和岩浆活动的影响，地质构造复杂，断层、褶皱构
潮北省自然科学基金一般项日（2011CDB351）；武汉市科技计划项目（201210321093）
【作者简介】符银昌，助理工程师，E-mail：182385226@qq-com
【收稿日期】2012-06-25；【修订日期】2012-09-15 万方数据
89
造发育。隧道进口洞口浅埋段长50m，最小埋深仅为1.5m。仰坡自然坡角为31°，坡向为60°，与隧道走向斜交，仰坡高度10~20m。上覆碎石土，厚 0.5m。下伏强风化元古界武当群绢云母片岩，岩层产状10°乙64°，坡向和岩层倾向近于垂直相交，边
坡较稳定。 2
进洞方式
2.1洞内支护设计
隧道设计为小净距双向四车道，隧道净宽 10.25m，净高5.0m，采用R-550单心圆曲增式衬