本项目围绕地面沉降防灾减灾的国家需要，针对常规监测手段在精细化获取土体内部变形存在的不足，开展地面沉降光纤监测关键技术研究，结合长江三角洲地面沉降严重区不同地质条件下的钻孔原位监测，建立地面沉降钻孔全断面监测技术体系；精细化掌握不同地层的变形量、变形速率、孔隙水压等信息，结合室内试验和土体微观结构分析，揭示地层变形演化宏观与微观特征。在此基础上，进行地面沉降灾害风险评估并建立地面沉降潜力评价方法。项目的主要研究内容包括：（1）地面沉降钻孔全断面光纤监测关键技术研究；（2）地层变形演化宏观特征研究；（3）地层变形演化微观特征研究；（4）基于全断面监测的地面沉降灾害风险评估和潜力评价。项目研究成果是对地面沉降监测的重要技术创新，对地面沉降防灾减灾和城市地下空间开发具有重要应用价值。

This project focuses on the national demand of prevention and mitigation of land subsidence. Aiming to make up the shortages of conventional monitoring techniques, we will investigate the key technologies on applying distributed fiber optic sensing (DFOS) techniques in land subsidence monitoring and set up several in-situ monitoring stations in Yangtze River delta, in order to establish the technical system of full section monitoring of borehole using DFOS. The macroscopic and microcosmic evolution characteristics of strata deformation will be explored by obtaining deformation amounts, deformation rates and pore pressure in boreholes and also the laboratory investigation and microstructural analyses on soils. Based on the studies abovementioned, an assessment method of land subsidence risk and an evaluation method of subsidence potential will be proposed. The main contents of this project are: (1) the key technologies on applying borehole full section monitoring of land subsidence using DFOS; (2) the macroscopic evolution characteristics of strata deformation; (3) the microcosmic evolution characteristics of strata deformation; (4) the risk assessment and subsidence potential evaluation based on borehole full section monitoring using DFOS. The outcome of this project will be an important technological innovation for land subsidence monitoring and be of great significance to the prevention and mitigation of land subsidence and the development of urban underground space.