Abstract
The construction of deep pit has a great impact on the surrounding environment, which is mainly reflected in the subsidence of surrounding soil. Because of the particularity in geological and hydrogeological conditions of riverside floodplain area, environmental impact assessment is needed. According to the monitoring data of practical engineering, the deep pit in the floodplain area near Yangtze River may cause a large subsidence of the surrounding soil with a rapid subsidence rate and a wide range of subsidence effects. The subsidence of the surrounding soil increases with the depth and time of excavation, and the post-construction subsidence effect is not obvious. The environmental effects of the deep foundation pit project in this project have provided valuable experience for guiding the implementation of the deep foundation pit near the floodplain in the future.
Highlights
During the implementation of the foundation pit engineering, due to the construction of the retaining structure and piles of pit, the dewatering and the excavation of earthwork, the stress field around the foundation pit changes, which has a significant impact on the surrounding environment
The environmental effects of the pit engineering include deformation of the retaining structure caused by excavation and dewatering, horizontal and vertical displacement of the soil around the foundation pit
The environmental effects of the deep foundation pit engineering are mainly affected by the geological conditions of the foundation pit and the characters of the foundation pit
Summary
During the implementation of the foundation pit engineering, due to the construction of the retaining structure and piles of pit, the dewatering and the excavation of earthwork, the stress field around the foundation pit changes, which has a significant impact on the surrounding environment. The environmental effects of the pit engineering include deformation of the retaining structure caused by excavation and dewatering, horizontal and vertical displacement of the soil around the foundation pit. These deformations and subsidence may affect the normal use and even damage adjacent buildings and underground pipelines. The environmental effects of the deep foundation pit engineering are mainly affected by the geological conditions of the foundation pit and the characters of the foundation pit. This paper takes the deep pit of the open excavation section of the Nanjing HeyanRoad-Crossing-River-Tunnel Project (South Part) as an example to discuss the impact of the foundation pit on the surrounding environment during the excavation process with the suspended water curtain
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