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虎门二桥坭洲水道桥西锚碇基坑施工监测技术 被引量:11

Construction Monitoring Techniques for Foundation Pit of West Anchorage of Nizhou Waterway Bridge of Second Humen Birdge
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摘要 虎门二桥坭洲水道桥为(548+1 688)m双塔钢箱梁悬索桥,该桥西锚碇为重力式锚碇基础,采用地下连续墙(外径90m、壁厚1.5m)作为锚碇基坑开挖的支护结构,基坑深约22m。为了解基坑开挖过程中基坑支护体系的受力和变形,对地下连续墙深层侧向变形、地下连续墙钢筋应力、帽梁变形、内衬钢筋应力、地下水位、墙外孔隙水压力、墙外土压力等进行系统的监测,并对监测数据及内衬钢筋应力突变情况进行分析。结果表明:施工过程中,地下连续墙体结构的应力与变形等均满足规范及设计的要求;地下水位变化较小,墙外空隙水压力总体保持稳定;地下连续墙封水效果良好,基坑整体稳定。 The Nizhou Waterway Bridge of the Second Humen Bridge is a double‐tower steel box girder suspension bridge with span arrangement (548+1 688) m .The foundation on which the west anchorage of the bridge is supported is the gravity foundation and the foundation pit is about 22 m deep .In the process of the excavation construction of the foundation pit ,the diaphragm wall (the external diameter of the wall being 90 m and the wall thickness being 1 .5 m) was used as the excavation supporting structure .To understand the force conditions and deformation of the sup‐porting structure system in the construction , the deep layer lateral deformation , reinforcement stress ,capping beam deformation ,lining reinforcement stress ,underground water level of the dia‐phragm wall and the pore water pressure and earth pressure outside the wall were systematically monitored and the monitoring data and abrupt changing of the lining reinforcement stress were ana‐lyzed .The results of the monitoring and analysis indicate that in the construction ,the stress and deformation of the diaphragm wall can meet the relevant requirements in the codes and design .The changing of the underground water level is little ,the pore water pressure outside the diaphragm wall is generally stable ,the effect of the water stoppage of the wall is sound and the foundation pit is integrally stable as well .
作者 朱治宝
出处 《桥梁建设》 EI CSCD 北大核心 2016年第5期6-11,共6页 Bridge Construction
关键词 悬索桥 锚碇基础 地下连续墙 应力 水压力 土压力 基坑监测 桥梁施工 suspension bridge anchorage foundation diaphragm wall stress water pres-sure earth pressure foundation pit monitoring bridge construction
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