砂土层基坑开挖对周围环境的影响研究

Study on Influence of Excavation on Surrounding Environment in Sandy Soil

基坑施工过程中对周边环境的影响一直是个热点问题,论文以沈阳某基坑工程背景,采用有限差分软件建立基坑开挖对临近既有结构的三维计算模型,研究基坑开挖时模型范围内位移场、既有运营隧道和地下商道结构变形的安全性评估。研究结果表明,随着基坑开挖,土体沉降量逐渐增加,并且土体水平位移在大部分发生在基坑内支撑附近;基坑开挖到中部时对其土体侧向位移影响最大,而既有盾构隧道和既有地下商道结构的最大变形随着基坑开挖基本呈现线性增加。

The influence of excavation construction on the surrounding environment has always been a hot issue. Based on the excavation project in Shenyang, the 3-D difference model has been established to investigate the effect of excavation on displacement field and the safety evaluation of the existing tunnel and the structural deformation of the underground hall. The results show that the ground surface settlement increases gradually along with excavation, and the horizontal displacement of the soil occurs mostly near the support structure of excavation. When excavation reaches to the middle part, it has the greatest impact on the lateral displacement of the soil. The maximum deformation of the existing shield tunnel and underground structure basically increases linearly with excavation.