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1、隧道洞身开挖作业指导书根据不同地段围岩级别、地质和水文条件、地面环境及预支护措施，采用的开挖方法为：Ⅱ级采用全断面法、Ⅲ级段采用台阶法或三台阶法；Ⅳ级段采用三台阶法、三台阶临时仰拱法；Ⅴ级采用双侧壁导坑法、四步CD法、六步CD法、三台阶临时仰拱法施工。（1）全断面法开挖施工工艺流程见“全断面法开挖施工工艺框图”。其施工工序：1）放样布眼钻眼前，测量人员用红铅油准确绘出开挖面的中线和轮廓线，标出炮眼位置，其误差不得超过5cm。在直线段，可用3～5台激光准直仪控制开挖方向和开挖轮廓线。2）定位开眼采用凿岩
2、台车钻眼，台架与隧道轴线要保持平行。台车就位后按炮眼布置图正确钻孔。对于掏槽眼和周边眼的钻眼精度要求比其它眼要高，开眼误差要控制在3cm和5cm以内。3）钻眼钻工熟悉炮眼布置图，能熟练地操纵凿岩机械，特别是钻周边眼，一定要有丰富经验的老钻工司钻，台车下面有专人指挥，以确保周边眼有准确的外插角（眼深3m时，外插角小于3°；眼深5m时，外插角小于2°），尽可能使两茬炮交界处台阶小于15cm。同时，根据眼口位置及掌子面岩石的凹凸程度调整炮眼深度，以保证炮眼底在同一平面上。4）清孔装药前，必须用由钢筋弯制的炮
3、钩和小于炮眼直径的高压风管输入高压风将炮眼石屑刮出和吹净。5）装药tomorrowIgofishingtotheEast.Bossesdon'thavefishtoeat."Positionsoutofafatman:"goingonnowinthepast,theImperialArmycameaftereatingisbad."OldKingsHeadRushthankedthecaptainrushedtothebaseforHongKong,ShenYuezhensaid:"Ithinksow
4、ell!"Aboardtheship,toldthroughagain.MonthsProhappymealsfreshlyprepared,Scullchunkspostimmediately.CardthatFushengoftheElvestakecareof:"oldKingsHeadtomorrow,yourfishsuchasweCaptain!""Know"thisistheKing'svoice,byfar.Atnight,theshiptoport,nexttoseeafewxiey
5、eofsmallfishingvessels,stopeating.Alexaftereatingtwoadjacentboatsstoppingby.Learnedfromthemouthsoflocalfishermenherehaveisguerrillazones,EastTaihuLakeinfestedwithbandits,Miaoganglandmark,quietatnight,sometimesinthemorningzhenzeJapanDevilssweep,afternoon
6、zhenze,Westofguerrillaactivities.Backontheboat,monthlyProactiondecidedbythefirstprogramme,gotoMiaogang,findfocalpointconnector.Gentlyopentheship,sailedintothetracklessYang.MonthsProhaslostitsway,don'tknowdirection,andhadtolettheoldKingwasdriving.OldKing
7、pullingtwooarssaid:"gooddaytoseethestars,cloudydaybyfeel.Youtakeabreak,gotoclassina构词成分。."No,thecabintherewas"grunting...Shout..."snore.Thenextmorning,MiaogangtheLionBridgeamourningfisherman'swoman.Headwrappedinwhitecloth,foot-wearwhiteshoes,sellingfish
8、inafishline.Heraredfloweronthetoeinhisleftfoot,awhitefloweronthetoeofhisrightfoot,whichisajointsign.Womenwereobservedonthestreetthatatobaccostores,postedalotofsmokeonthedoor,thereisnooldknifebrand.ShopkeepersfacingWest,therearean
