密集建筑群下大断面隧道施工反馈分析及安全性控制研究

 厦门梧村隧道施工影响区域内建筑物密集，具有超浅埋、大跨度、工艺复杂、工序繁多、地面建筑物保护要求高等高风险特征，在隧道施工过程中研究并实施复杂地质情况和周边环境条件下隧道的动态反馈分析方法。现场监测内容有建筑物及地表沉降、建筑物裂缝、建筑物倾斜、隧道拱顶沉降、隧道围岩收敛、土体深部位移、土体分层沉降、爆破震动、地下水位等，对重要建筑物还采用静力水准仪进行自动化监测。在对梧村隧道进行施工反馈分析过程中，按照ISO9001质量认证体系要求建立一个完善、高效的运作体系，根据城市隧道工程修建经验以及梧村隧道前期研究成果，对隧道施工对周边环境以及隧道自身结构的影响进行监测，除采取常规监测手段外，以建筑物不均匀沉降自动化监测、监测信息管理和预测预报系统、局域网和广域网进行监测信息反馈、桌面报警系统和电子显示板等预警设施等先进技术来开展施工反馈分析工作，使梧村隧道施工反馈分析工作具有鲜明的信息化特色。

STUDY OF FEEDBACK ANALYSIS AND SAFETY CONTROL OF LARGE-SECTION TUNNEL EXCAVATION UNDER INTENSIVE BUILDINGS

Wucun tunnel underpasses intensive buildings with high-risk characteristics such as ultra-shallow,large-span,complex construction process,high-protection demand on buildings in Xiamen City,and dynamic feedback analysis method is carried out during tunnel construction process in complex geological and environmental conditions. The monitoring measures for the safe construction of the tunnel mainly include building settlement,surface subsidence,building inclination,the tunnel vault subsidence,tunnel adjacent formation restraining,the soil body depth portion displacement,the soil body lamination subsidence,blasting vibration,subsoil water level and so on,especially static level sensor is applied to the important buildings for automatic monitoring. In accordance with ISO9001 quality certification system,a sound and efficient operation system is established in the feedback analysis process. Based on construction experience of city tunnel and the results of preliminary researches in Wucun tunnel,monitoring is carried out on the surrounding environment as well as on tunnel structure itself. In addition to routine monitoring tools,advanced technology such as automatic monitoring on differential settlement of buildings,monitoring information management and prediction systems,monitoring information feedback by LAN and WAN,early-warning facilities by desktop alarm systems and electronic display boards,are applied to dynamic feedback analysis throughout tunnel construction;so that the feedback analysis work has distinctive informationizing characteristics in Wucun tunnel engineering.