搜索
南京地铁二号线TA07标集庆门大街站～茶亭站区间盾构到达端头补强加固方案编制审核审批中国中铁一局集团南京地铁二号线TA07标项目经理部二OO八年三月目录1、编制依据···················································································12、加固原则和要求··········································································12.1、到达端头土体加固的原则····························································12.2、加固要求···············································································13、工程概况···················································································13.1、端头管线情况···········································································23.2、端头地质情况···········································································23.3、盾构机基本参数········································································43.4、集庆门大街站到达端头原设计加固方法·········································43.5、集茶区间到达端加固检测结果······················································53.6、原因分析·················································································54、端头加固方案·············································································54.1、端头管线改移···········································································64.2、端头补强处理···········································································64.3、端头加强加固···········································································64.3.1、原加固体加强········································································64.3.2、将加固体加长········································································74.4、高压旋喷桩施工工艺··································································84.4.1、施工工艺流程········································································84.4.2、旋喷桩施工参数·····································································84.4.3、施工方法···············································································94.4.4、旋喷桩施工技术要点·······························································95、施工管理与安排··········································································105.1、人员管理·················································································105.2、物资设备管理···········································································105.3、工程数量·················································································115.4、工期安排·················································································116、施工安全措施·············································································116.1、安全管理措施···········································································116.2、应急预案·················································································117、文明施工措施·············································································128、质量保证体系·············································································121南京地铁二号线TA07标集庆门大街站～茶亭站区间盾构到达端头补强加固方案1、编制依据（1）南京市地铁二号线一期工程TA07标土建工程合同文件；（2）南京市地铁二号线一期工程TA07标集庆门大街站～茶亭站区间平纵断面及衬砌环布置图；（3）集庆门大街车站、集～茶区间岩土工程详细勘察及补堪报告；（4）井巷工程设计规范；（5）国家现行有关施工及验收规范、规则、质量技术标准，以及南京地区在安全文明施工、环境保护、交通组织等方面的规定；（6）本单位类似工程的相关施工经验。2、加固原则和要求2.1、到达端头土体加固的原则（1）根据隧道埋深及盾构隧道穿越地层的地质水文情况，确定加固方法和范围；（2）充分考虑洞门破除的时间和方法，选择合适的加固方式、方法和范围，确保盾构机始发与到达端的安全和洞门破除的安全。（3）施工方案应在不影响工程工期的条件下具备优化能力；（4）施工方案及措施必须满足城市环保及节能要求；2.2、加固要求（1）加固后的土体具有良好的均匀性和自立稳定性；（2）加固土体无侧限抗压强度达到0.8Mpa以上；（3）渗透系数≤1.0×10-8cm/sce。3、工程概况集庆门大街站～茶亭站区间到达端头隧道范围内地层为淤泥质粉质粘土，具有微透水性，隧道中心标高为-4.275m，隧道埋深为8.75m，两隧道中心间距10m，2集庆门大街站围护结构为φ1000@800mm咬合钻孔灌注桩；车站内地基加固采用的是高压旋喷桩满堂加固；为保证车站围护止水效果，在围护桩外侧又加设一排φ800@550mm的高压旋喷桩。在地基加固期间，车站内降水井距加固区域最近为40m，据十九局介绍，在离降水井远的高压旋喷桩成桩质量要明显好于离降水井近的。目前，车站地基加固已经结束，车站开挖到距到达端头25m的位置。端头附近有6口降水井在进行坑内降水，每口降水井日抽水量为800m3。3.1、端头管线情况在端头加固区距围护桩7m位置有一φ1500mm的雨水管，其顶部埋深为2.5m，与线路垂直，横穿端头加固区；在加固体范围有两条φ800mm的自来水管与线路方向斜交，其中右线加固区与一条管线在加固区角部相交，相交部位面积为1.44m2。管线具体位置见下图：端头管线位置示意图3.2、端头地质情况区间场地上部以淤泥质粉质粘土为主，局部为粉土、粉砂，下部以粉砂为主。场地赋存于粘土中的地下水类型属孔隙潜水，赋存于下部粉土、砂性土层中地下水具一定的承压性。承压水层中地下水与长江及秦淮河均有一定的水力联系场地地面下饱和的②-2d3层、②-3c2-3层、②-3d2-3层（零星）为液化土层，场3地地基土具轻微液化。集庆门大街站到达端头地层情况见下表：层号层底标高（m）层底深度（m）分层厚度（m）岩性描述①-17.230.70.7杂填土：灰黄~杂色，以砼块、碎砖、碎石等建筑垃圾为主，夹有粘性土，结构松散。①-2b4.533.42.7素填土：灰黄~褐黄色，含少许碎砖、碎石，主要由粘性土组成，局部为含石灰的三合土，结构松散，均匀性差。②-2b4-6.5714.511.1淤泥质粉质粘土：灰色，含有机质及少许腐植质，夹有薄层粉土或粉砂，土质较为均匀，流塑。切面光滑，摇振反应无~低，干强度中等，韧性中等。②-2d3-8.07161.5粉砂：灰色，夹粘性土薄层。松散~稍密湿。②-3b3-4-11.07193淤泥质粉质粘土：灰色，含有机质及少许腐植质，呈互层状，层间夹有粉土或粉砂薄层，流塑，局部软塑。切面稍有光滑，摇振反映无~低，干强度中等，韧性中等。②-3d2-3-20.5728.59.5粉砂：灰色，含云母，夹有机质，夹粉土薄层，偶含少许腐植质，稍密~中密，饱和。②-4b3-4-22.5730.52淤泥质粉质粘土：灰色，含有机质，夹粉土薄层，软塑~流塑，切面光滑~稍有光滑，摇振反应无，干强度中等，韧性中等。规划六号线2.3015.8018.403.80-7.73-23.9232.0026.90-18.82-23.6131.70f-13.8221.90-9.42-8.2216.3017.5020.40-12.3129.80-21.83f25.90-17.93-10.17ff17.20-9.23f18.30-10.33-6.9215.00-5.31-6.91f13.4015.004.585.783.502.306.491.604.893.207.590.50-6.3714.40-6.4314.507.635.234.931.406.573.104.873.202.904.275.770.50集庆门大街站到达端头地质剖面图43.3、盾构机基本参数本区间采用小松TM634PMX土压平衡盾构机始发掘进。该盾构机适宜在粉质粘土、粉土、淤泥质粘土、粉砂、细砂等土层中的掘进施工；盾构机掘进最小曲率半径水平R=150m，最大坡度40‰。盾构机设备总重量约为330T，盾体长度为9.03m，后配套总长52.846m，总长61.526m。盾构机分为盾构机主机和后配套设备两大部分，后配套设备分别安装在5节后续台车上。盾构机盾尾间隙30mm，最大掘进速度6cm/min，最大推力37730KN。盾构机刀盘直径为6.36m，刀盘的结构为辐条面板型，刀盘开口率为40%。在刀盘上配置安装了66把先行刀及12把周边先行刀，主切削刀配置78