长江漫滩地区深基坑施工对盾构隧道影响及应急保护研究

发布时间：2018-04-28 04:27

本文选题：长江漫滩 + 深基坑　；参考：《隧道建设》2017年10期

【摘要】：为研究长江漫滩地区深基坑工程对邻近盾构隧道的影响因素,验证在该特殊土层实施针对性综合保护应急措施的可行性,以长江漫滩地区深基坑工程盾构隧道应急保护实际案例为背景,依据前期施工阶段监测资料,分析出该地质条件下深基坑施工对周边盾构隧道结构变形的主要影响因素为降水、侧向卸载及附加荷载。采用修正惯用法对各影响因素进行定量分析,针对后续施工叠加影响采取相应施工控制及隧道加固等综合保护应急措施。实施处置措施前后监测数据对比及反分析得出,长江漫滩地区邻近盾构隧道深基坑在设计、施工期间应着重对基坑降水、卸载及附加荷载进行控制,当盾构隧道出现结构安全问题时,采用综合保护应急措施可取得显著治理效果。
[Abstract]:In order to study the influence factors of deep foundation pit engineering on the adjacent shield tunnel in the floodplain area of the Yangtze River, the feasibility of implementing targeted comprehensive protection emergency measures in this special soil layer is verified. Based on the actual case of shield tunnel emergency protection in deep foundation pit engineering in the floodplain area of the Yangtze River, and based on the monitoring data of the previous construction stage, the paper analyzes that the main influence factor of the deep foundation pit construction on the surrounding shield tunnel structure deformation under this geological condition is precipitation. Lateral unloading and additional loads. The influence factors are quantitatively analyzed by using the modified customary method, and the corresponding construction control and tunnel reinforcement are adopted to protect and meet the needs of the subsequent construction superposition. The comparison and back analysis of monitoring data before and after the implementation of disposal measures show that during the design and construction of the deep foundation pit of shield tunnel adjacent to the Yangtze River floodplain area, emphasis should be placed on controlling the dewatering, unloading and additional loads of the foundation pit. When the shield tunnel has structural safety problems, adopting comprehensive protection and emergency measures can achieve remarkable control effect.
【作者单位】：南京地铁集团有限公司;中设设计集团股份有限公司;
【分类号】：TU753;U455.43

【相似文献】