隧道施工项目二隧道开挖方法ProjectTunnelex.pptx

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一、隧道洞口工程内容

Ⅰ.Contentsoftunnelportalproject;

二、洞口施工要点

Ⅱ.Keypointsofportalconstruction;

二、洞口施工要点

Ⅱ.Keypointsofportalconstruction;

三、洞口边、仰坡开挖及防护

Ⅲ.Excavationandprotectionofslopesaroundtunnelentrance;

三、洞口边、仰坡开挖及防护

Ⅲ.Excavationandprotectionofslopesaroundtunnelentrance;

四、边仰坡开挖及防护施工流程

Ⅳ.Slopeexcavationandprotectionconstructionprocess;地表截水

Surfacewaterinterception;地表预加固

Surfaceprereinforcement;洞口土石方开挖

Earthrockexcavationatportal;

五、进洞方法

Ⅴ.Themethodoftunnelentrance;

六、洞口段施工

Ⅵ.Constructionoftunnelportalsection;6.1洞口段施工，应符合下列要求：

（1）进洞前应按设计施作超前支护。

（2）洞口段应加强初期支护，及时形成封闭结构，衬砌应尽早施作。

（3）洞口段的监控量测应适当增加量测频率。

6.1theconstructionofportalsectionshallmeetthefollowingrequirements:

Beforeenteringthetunnel,advancesupportshallbemadeaccordingtothedesign.

(2)Attheentrancesection,theinitialsupportshouldbestrengthenedtoformaclosedstructureintime,andtheliningshouldbeconstructedassoonaspossible.

(3)Themonitoringandmeasuringfrequencyofportalsectionshouldbeincreasedappropriately.;6.2地表锚杆施工应符合下列要求：

（1）施工前应清除植被，夯平表土，清除危石。

（2）锚杆应按设计要求布置孔位，垂直向下施钻。

（3）成孔后应及时灌浆，灌浆管插入孔底。

（4）锚杆安装前应除锈矫直，锚杆插入深度应符合设计要求。

6.2Thesurfaceanchorconstructionshallmeetthefollowingrequirements:

Vegetation,topsoilanddangerousrocksshallberemovedbeforeconstruction.

(2)Theanchorrodshallbearrangedwithholesaccordingtothedesignrequirementsanddrilledverticallydownward.

(3)Aftertheholeisformed,groutingshallbecarriedoutintime,andthegroutingpipeshallbeinsertedintothebottomofthehole.

(4)Theanchorrodshouldbederustedandstraightenedbeforeinstallation,anditsinsertiondepthshouldmeetthedesignrequirements.;

七、洞外排水??符合下列要求

Ⅶ.Thedrainageoutsidethetunnelshallmeetthefollowingrequirements;

七、洞外排水应符合下列要求

Ⅶ.Thedrainageoutsidethetunnelshallmeetthefollowingrequirements;隧道洞口埋深浅，围岩