;2;3;
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