盾构掘进施工第三方监测技术总结报告

XX长江隧道工程盾构掘进施工第三方监测技术总结报告 XX地质勘察设计有限公司20年月 XX长江隧道工程盾构掘进施工第三方监测 总结报告项目负责：编写：审核：总工程师：批准：XX地质勘察设计有限公司20年月目录第一节工程概况························································11.1概述·································································11.2水文工程地质概况···············································1第二节监测作业依据、目的与意义································32.1监测作业依据····················································32.2监测的目的与意义··············································42.3监测方案的编制原则············································42.4监测内容及监测范围············································4第三节监测·························································53.1监测组织实施····················································53.2监测项目的实施·················································93.3野外监测作业实施·············································103.4监测精度·························································12第四节警戒值的确定················································124.1警戒值的确定原则·············································124.2警戒值的确定···················································13第五节监测组织实施················································135.1监测投入仪器设备·············································135.2监测资料的提交················································14第六节监测完成工作量·············································14第七节监测成果总结与分析·······································157.1陆域地表监测···················································157.2隧道收敛监测···················································257.3江中段江底隆陷监测···········································357.4西线盾构推进对东线的影响监测····························38第八节结语····························································38附件：XX长江隧道盾构施工第三方监测变形曲线图册XX长江隧道盾构推进第三方监测总结报告XX地质勘察设计有限公司XX长江隧道盾构推进第三方监测总结报告XX地质勘察设计有限公司第页共39页江底扫描监测原理示意图江底扫描监测原理示意图由于在施测期间江面风浪、船只等各种客观因素影响，给江底扫描测量成果精度带来一定的误差。但从数据结果上说，我们所取得的数据是满足对江底跟踪监测要求的。从整体监测数据看，在长江南北主要航道上，每次所监测的成果与背景值相差较大，这可能与航道上过往船只及潮汛水流冲刷原因所致。江中段变化较小，可能是受到各种外界因素影响较小的缘故。在两条盾构不断推进过程中，大量的泥浆涌入长江，导致长江南侧江边部分大量淤积，江北侧航道上，由于和背景值监测时间相隔较长，所以下降的幅度相对南侧航道大。各点变化趋势详见附图第225页。江底扫描监测现场图7.4西线盾构推进对东线的影响监测西线盾构推进对东线位移影响：从监测数据上看，西线盾构的推进对东线影响甚微,考虑到受到施工环境的影响及各种无法避免的误差，从上方曲线可以推知：西线盾构的推进对东线可以认为没有影响。各点变化趋势详见附图第226页第八节结语XX长江隧道的建设，改变了XX与崇明岛及长江江北交通不便状况，为崇明岛的开发创造了重要前提和条件，并对完善XX的路网结构，增强了XX的辐射能力，促进长江三角地区经济一体化、均衡化发展具有重要意义。长江隧道本身最大特点是直径大、距离长、穿越长江江底、贯穿长江南北。针对长江隧道在监测过程中，我们采用了江中段江底跟踪扫描监测、隧道内横径采用免棱镜直接测距法，这在以往的隧道监测中都是不曾有的。这也是实际工作中根据现场条件所决定的。在实际施测过程中，我们在保证施工安全的情况下，做到数据监测无误。监测重点：长江隧道的盾构机的掘进，分别穿越了长江南北江边大堤，长兴岛的房屋。深度达13米的长江，在实际施工过程中，为了实时反应出盾构掘进对地表建筑物、江底的影响，我们针对性的对盾构在穿越长江大堤阶段，进行实时跟踪监测，反应大堤的变化，确保大堤的安全。为此，我们加大了监测大堤的频率、密度等，每推进一环进行一次监测。在江底段，为了确保监测的可靠性、准确性与可比性，我们加长了每次的扫描范围。这样就保证了有更多的比较区域，有更多的监测数据指导盾构推进的参数情况。难点：长江隧道的工程大，以至于我们投入的人力、物力明显优于其他的较小工程设施。也正是这样，我们时刻都保持着一丝不苟的工作态度和科学严谨的作风，不论遇到什么困难，我们都要设法克服。在隧道内的监测中，由于口子件的路面窄，施工过往车辆过多，给我们监测带来一定困难，这样，就要求我们在保证安全的情况下，对每个监测点，要进行重复监测来做到数据的准确性。江底扫描段，有时候受到潮汐、风浪、雨雾及过往船只的影响，都给我们的工作带来了一定困难。为此，我们就要花费更多的时间和精力来确保监测的顺利进行。过大堤段，由于监测频率的增加，这就要求我们的劳动强度相应的增大。在盾构穿越大堤的日日夜夜，我们几乎都在大堤的掘进中度过。为此，保证了盾构的顺利穿越。在为期24个月的监测中，我公司监测项目部全体员工在施工过程中发扬“务实、团结、协作”的精神，不怕吃苦，奋力拼搏，全力以赴做好监测工作，以监控隧道施工安全为宗旨，做到对隧道施工过程中隧道各构筑物及周边环境的形变时刻心中有数，在不影响正常施工的前提下，始终将监测工作置于施工之前开启，及时指导施工，为科学、合理的安排施工进度及程序，