大直径超深工作井施工对周边环境影响分析

基坑降水对周边环境影响是基坑开挖普遍存在的问题,特别是在复杂地质环境下的超深基坑开挖工程更为突出。本文结合珠江三角洲水资源配置项目,结合其工程水文地质条件,通过现场监测和理论分析手段,对工作井施工过程中和施工完成后周边地下水位、周边建筑物沉降进行监测,基于监测数据揭示工作井施工过程中水位变化、周边地表沉降规律,并对导致周边土体沉降突发的主要因素进行判别分析,最后给出降水引起周边建筑物沉降值的计算方法,以期为类似工程提供技术和经验参考。

Influence of Construction of Large Diameter Ultra-Deep Working Well on Surrounding Environment

The influence of foundation pit dewatering on surrounding environment is a common problem in foundation pit excavation,especially for the ultra-deep foundation pit under complex geological environment.Combined with the water resources allocation project of the Pearl River Delta,firstly,the hydrogeological conditions of the project was analyzed,through field monitoring and theoretical analysis,the underground water level and settlement of surrounding structures were monitored during the construction process.Then,based on the monitoring data analysis,the rule of the water level change,settlement of surrounding environment was revealed,and the main factors leading to the surrounding soil settlement were analyzed.Finally,the calculation method of surrounding building settlement caused by the dewatering was given.It provides an experience reference for similar projects.