南京长江隧道浦口深基坑信息化施工与分析

以南京长江隧道浦口深基坑工程为例,介绍了深基坑工程施工安全监测和信息化施工手段。针对不同的维护结构,设计了不同类型的监测断面,监测内容包括沉降与位移、基坑底部隆起、地下水位、支护桩内力、支撑轴力和水土压力等。结合施工工况分别对引道段、暗埋段、井后续段、盾构始发工作井及周边环境的监测数据进行了分析,表明基坑外侧降水可改善支护结构受力情况,但大面积降水对工程周边环境影响较大,基坑支护结构变形和内力与支撑设置及工况密切相关,反馈的意见实时指导了施工。研究成果可为今后类似工程的设计、施工和研究提供有益的借鉴和参考。更多还原 AbstractFilter('ChDivSummary','ChDivSummaryMore','ChDivSummaryReset');

Analysis and information construction of Pukou deep foundation pit of Nanjing Yangtze River tunnel

 Taking the deep excavation engineering at Pukou of Nanjing Yangtze River tunnel as an example,the measures for the safety monitoring and information construction of deep foundation pit are introduced.Different types of monitoring sections are designed based on different maintenance structures.The monitoring content includes settlement and displacement,bottom heave in foundation,ground water level,internal force of piles and slurry walls,support axial force,water pressure and earth pressure,etc.Based on construction conditions,the monitoring data of leading path segment,hiding building segment,shield originating working well and engineering circumference circumstance are analyzed.The analytical results show that the support system force is improved by lowering the ground water level outside the deep foundation pit,but the surrounding circumstance is greatly affected by large-scale lowering of ground water.The deformation and internal force of supporting structure are interrelated with the support setting and construction conditions.The monitoring feedback results duly guide the construction of deep excavation.The experience and conclusions can be the reference for the design,construction and researches of similar projects.