mIVb(26.58㎡/延米)、251mIIIb(26.42㎡/延米)。即:78/3*0.25*(27.04+1.57)+129.3/3*0.25*(26.73+1.57)+50/3*0.25*(26.58+1.57)+372.7/3*0.25*(26.73+1.57)+35/3*0.25*(26.89+1.57)+466/3*0.25*(26.58+1.57)+251/3*0.25*(26.42+1.57)=3248.76㎡。防水板土工布开累合理超耗3248.76㎡。Р②中埋止水带:隧道平均预留沉降量0.2m,二衬共施作1386.6m每道施工缝增加2m中埋止水带(弧长增加2m),共增加(1386.6/11.9+1)*2=235.04m;仰拱环向施工缝与纵向搭接长度为(1400/6+1)*0.3(搭接长度)*2=140.6m;边墙纵向止水带搭接长度为(1249/6+1)*0.3搭接长度)*2=135.5m;仰拱施1400m,平均每板弧长增加0.7m(超挖0.1m~0.2mР),则中埋止水带增加(1400/6+1)*0.7=164.03m。合计开累超出设计:235.04+140.6+135.5+164.03=675.17m。Р③背贴止水带:隧道平均预留沉降量0.2m,二衬共施作1386.6m每道施工缝增加2m背贴止水带(弧长增加2m),共增加(1386.6/11.9+1)*2=235.04m;仰拱环向施工缝与纵向搭接长度为(1400/6+1)*0.3(搭接长度)*2=140.6m;仰拱施做1400m,平均每板弧长增加0.7m(超挖0.1m~0.2m),则中埋止水带增加(1400/6+1)*0.7=164.03m。合计开累超出设计:235.04+140.6+164.03=539.67m。Р隧道十组节超情况:Р开累节超数量:见附表Р隧道十组节超原因分析:Р砼及喷砼原材料超耗原因:
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