大面积基坑开挖工序对邻近供能管沟的影响

以虹源盛世国际文化城A1区基坑工程为背景,采用有限元数值模拟的方法,研究了开挖工序对基坑本身及周围环境的影响.结果表明,相同开挖支护条件下,基坑开挖完成后方案1(以岛式开挖为主)和方案2(以盆式开挖为主)的基坑坑底隆起量、格构柱立柱桩竖向位移、支撑围檩格构柱体系应力、地下连续墙侧移和管沟竖向位移的最终数值大小相近但后者略小;相较方案1,方案2施工过程中各工况土方开挖对基坑本身及周围环境影响的急剧变化程度更缓和,因而更偏于安全.

Influence of Construction Procedures on Adjacent Energy Supply Pipeline due to Large Foundation Pit Excavation

Abstract： In this paper, numerical simulation analyses were performed to investigate the influence of construction procedures on foundation pit itself and the surrounding environment based on the background of A1 foundation pit of Shanghai Hongyuan Prime International Cultural City. The results show that when the excavation is completed, the final values of the amount of excavation pit bottom, vertical displacement of lattice and erect columns, stress of supporting system, lateral displacement of diaphragm wall and vertical displacement of adjacent energy supply pipeline for the Scheme One (mainly using island excavation) and Scheme Two (mainly using basin excavation) under the same conditions for the excavation and supporting are similar, but the latter is slightly smaller. In Scheme Two, the degree of the value dramatic changes for the impact of large foundation pit excavation on the foundation pit itself and the surrounding environment during each working condition is gentler than the value changes in Scheme One, therefore, Scheme Two is safer.