长江下游鳗鱼沙护滩堤工程水下软基分层沉降监测

传统监测技术方法难以用于护滩堤工程这类水下建筑物软土地基分层沉降监测。针对鳗鱼沙护滩堤水下软土地基分层沉降的安全监测问题，提出新型测量仪器设备和技术手段，可避免干扰施工、保护仪器良好工作并获得地基土体压缩量。通过现场仪器安装埋设、原型监测试验及监测成果分析，得到施工加载期和结束运行期水下软基分层沉降及土体压缩过程规律。结果表明水下软基保持安全稳定，验证了水下软基分层沉降新型监测仪器设备及技术方法的可行性及适用性。

Monitoring technique of layered settlement in underwater soft soil foundation of Manyusha beach protection embankment project downstream the Yangtze River

Because the traditional measuring method is not suitable for the layered settlement monitoring in soft soil foundation of the constructions under water,such as beach protection embankment project,the new type of measuring instrument and technique were proposed for the safety monitoring problem of layered settlement in soft soil foundation under water of Manyusha beach protection embankment project.To avoid interrupting the construction,keep instruments well running,and obtain the compression of soft soil foundation,new instruments were installed on site for the prototype monitoring test.According to the monitoring result analysis,the process rules of the layered settlement and compression of the soft soil foundation under water were obtained during construction and running.It showed that the soft soil foundation of the beach protection embankment under water was safe and stable.The feasibility and applicability of the new instrument and technique for the layered settlement monitoring in soft soil foundation of the constructions under water were tested and verified.