A MULTI-LEVEL SUPPORT TECHNOLOGY IN EXCAVATION OF A TRANSPORTATION CENTER

摘要

Massive deep excavation in soft soil will cause the instability of the surrounding buildings.Three-level support technology in this paper is successfully applied to pit excavation of a transportation center.The first-level pit in the project consists of two-level grading and cement-soil gravity retaining wall, the second and third level pits are comprised of underground continuous walls and two stages of steel braces.After monitoring the whole process, the results show that the multi-level support plans meet the construction requirements of main structure, and is economically effective.