隧道安全步距超標(biāo)的處理措施

隧道安全步距超標(biāo)的處理措施xx隧道是xx公路xx第x標(biāo)段內(nèi)的一座左、右分離式隧道，設(shè)巖，屬硬質(zhì)巖，抗風(fēng)化能力較強(qiáng)，圍巖為Ⅳ~(yú)Ⅴ級(jí)；洞身段埋深一般硬質(zhì)巖，抗風(fēng)化能力較強(qiáng)，圍巖為Ⅳ~(yú)Ⅴ級(jí)。類(lèi)別ⅢⅢⅢⅢ里程K7+000~K7+065K7+065~K7+285K7+285~K7+480K7+480~K7+570K7+570~K7+752K7+752~K7+782K7+782~K7+824K7+824~K7+854K7+854~K7+994K7+994~K8+218K8+218~K8+260長(zhǎng)度（m)65220904222442類(lèi)別ⅢⅢⅢⅢ里程K7+000~K7+110K7+110~K7+280K7+280~K7+500K7+500~K7+592K7+592~K7+784K7+784~K7+814K7+814~K7+856K7+856~K7+886K7+886~K8+020K8+020~K8+236K8+236~K8+308長(zhǎng)度（m)2209242216襯里程K8+141.6，距離260.2m；左線掌子面里程ZK7+878，二襯里xx隧道左、右線二襯安全步距已超過(guò)文件規(guī)定，監(jiān)理辦為此下根據(jù)目前作業(yè)隊(duì)人員和機(jī)械配備情況，結(jié)合十月、十一月份xx拱和二襯作業(yè)人員不足。由于xx地區(qū)對(duì)標(biāo)準(zhǔn)化施工要求高，造成仰進(jìn)，即10.4m/3d。由于開(kāi)挖、支護(hù)及二襯施工進(jìn)度不均衡，開(kāi)挖、3、項(xiàng)目部積極與業(yè)主進(jìn)行了協(xié)調(diào)，第五期計(jì)量款已支付到位；4、根據(jù)目前實(shí)際情況，對(duì)現(xiàn)場(chǎng)二襯施工組織進(jìn)行調(diào)整，以確保襯砌類(lèi)型SA3SA4SA3SA4里程段落ZK7+787～ZK7+819ZK7+819～ZK7+859ZK7+859～ZK7+989ZK7+989～ZK8+213長(zhǎng)度（m)40224圍巖類(lèi)別ⅢⅣⅢⅣ里程段落ZK7+782～ZK7+824ZK7+824～ZK7+854ZK7+854～ZK7+994ZK7+994～ZK8+218長(zhǎng)度（m)42216位，二襯跳開(kāi)ZK7+937.6～ZK8+105.5段15環(huán)（其中ZK7+989~此，二襯安全距離縮短至150m，滿足標(biāo)化要求，掌子面開(kāi)挖、支護(hù)素砼，二襯施工進(jìn)度按照每?jī)商煲画h(huán)推進(jìn)，即（10.4m)/2d；開(kāi)挖施工進(jìn)度按照3m/d推進(jìn)。具體推進(jìn)進(jìn)度如下：序號(hào)掌子面里程掌子面圍巖級(jí)別二襯推進(jìn)里程襯砌類(lèi)型二襯安全步距（m)說(shuō)明12014-12-1ZK7+798.0ⅢZK8+105.5SA4307.522014-12-3ZK7+798.0ⅢZK7+948.0SA332014-12-5ZK7+798.0ⅢZK7+937.6SA3139.6掌子面復(fù)工42014-12-7ZK7+792.0ⅢZK7+927.2SA3135.2襯砌2天/環(huán)52014-12-9ZK7+786.0ⅢZK7+916.8SA3130.8襯砌2天/環(huán)62014-12-11ZK7+780.0ⅣZK7+906.4SA3126.4襯砌2天/環(huán)72014-12-13ZK7+774.0ⅣZK7+896.0SA3襯砌2天/環(huán)82014-12-15ZK7+768.0ⅣZK7+885.6SA3117.6襯砌2天/環(huán)92014-12-17ZK7+762.0ⅣZK7+875.2SA3113.2襯砌2天/環(huán)2014-12-19ZK7+756.0ⅣZK7+864.8SA3108.8襯砌2天/環(huán)2014-12-22ZK7+747.0ⅢZK7+854.4SA4107.4襯砌3天/環(huán)2014-12-25ZK7+738.0ⅢZK7+844.0SA4襯砌3天/環(huán)2014-12-28ZK7+729.0ⅢZK7+833.6SA4104.6臺(tái)車(chē)回退里程ZK7+833.6，安全步距104.6m。此時(shí)掌子面為Ⅲ級(jí)圍巖，且襯砌類(lèi)型SA3SA4SA3SA4SA4JQ里程段落K7+819~K7+851K7+851~K7+891K7+891~K8+015K8+015~K8+065K8+065~K8+110長(zhǎng)度（m)4045圍巖類(lèi)別ⅢⅣⅢⅣ里程段落K7+814～K7+856K7+856～K7+886K7+886～K8+020K8+020～K8+236長(zhǎng)度（m)42216處就位，二襯跳開(kāi)K7+948.4～K8+073.2段12環(huán)（其中K8+065~K8+073.2段襯砌類(lèi)型為SA4JQ：8.2m；K8+015～K8+065段襯砌類(lèi)型沉值13.17mm,下沉率93.1＞80%；位移速率為0.03mm/天＜0.15mm/二襯安全距離縮短至146.2m，滿足標(biāo)化要求，掌子面開(kāi)挖、支護(hù)復(fù)二襯施工進(jìn)度按照每?jī)商煲画h(huán)推進(jìn)，即（10.4m)/2d；開(kāi)挖施工進(jìn)度按照3m/d推進(jìn)。具體推進(jìn)進(jìn)度如下：序號(hào)掌子面里程掌子面圍巖級(jí)別二襯里程襯砌類(lèi)型二襯安全步距（m)說(shuō)明12014-11-28K7+802.2ⅣK8+073.2SA4JQ27122014-12-3K7+802.2ⅣK7+948.4SA3146.232014-12-5K7+796.2ⅣK7+938.0SA3141.8襯砌2天/環(huán)42014-12-7K7+790.2ⅣK7+927.6SA3137.4襯砌2天/環(huán)52014-12-9K7+784.2ⅣK7+917.2SA3襯砌2天/環(huán)62014-12-11K7+778.2ⅢK7+906.8SA3128.6襯砌2天/環(huán)72014-12-13K7+772.2ⅢK7+896.4SA3124.2襯砌2天/環(huán)82014-12-15K7+766.2ⅢK7+886.0SA3119.8襯砌2天/環(huán)92014-12-18K7+760.2ⅢK7+875.6SA4115.4襯砌3天/環(huán)2014-12-21K7+754.2ⅢK7+865.2SA4襯砌3天/環(huán)2014-12-24K7+748.2ⅢK7+854.8SA4106.6襯砌3天/環(huán)2014-12-27K7+742.2ⅢK7+844.4SA4102.2襯砌3天/環(huán)2014-12-29K7+736.2ⅢK7+834.0SA397.8臺(tái)車(chē)回退里程K7+834，安全步距97.8m。此時(shí)掌子面為Ⅲ級(jí)圍巖，且K7至此，將臺(tái)車(chē)退回至K8+062.8～K8+073.2處就位，開(kāi)始施工K7+948.4～K8