一、引言 深基坑开挖特别是城区闹市内高层建筑的深基坑开挖的支护,由于其施工条件差,对减小环境不良效应要求高,地下障碍多,而且大多数地质条件恶劣……等原因,加之竞争机制的引入、业主对造价、工程进度和工程质量的要求越来越高,使得深基坑开挖的支护技术以及这一课题的研究越来越具有重大的工程意义,并为许多基础工程施工单位和工程师们密切关注。 I. INTRODUCTION Deep foundation pit excavation, especially for deep foundation pit excavation of high-rise buildings in urban areas downtown, is due to poor construction conditions, high requirements for reducing environmental adverse effects, many underground obstacles, and most geological conditions are poor ... and other reasons, coupled with the introduction of the competition mechanism and the higher and higher requirements of the owners on the construction cost, project schedule and project quality, making the deep excavation excavation support technology and research on this subject more and more important projects. Meaning, and pay close attention to many foundation engineering construction units and engineers.