软土地基临江特大型相邻深基坑同期施工监测分析

 结合软土地基临江两相邻深基坑施工监测数据，分析两基坑同期开挖过程中邻近位置围护墙变形、支撑轴力和立柱沉降受到的影响，分析结果表明：相邻位置中部的围护墙变形呈增大趋势，角部及远离相邻位置的围护墙变形受邻近基坑影响较小；相邻基坑开挖对邻近位置的围护墙顶竖向位移影响较大，基坑距离越小，相邻位置围护墙顶水平位移越大；邻近基坑处支撑轴力达峰值后呈变小趋势，立柱竖向位移值呈加大趋势；与已有理论对比发现基坑相邻位置围护结构变形不同于独立基坑开挖的情况。

MONITORING AND ANALYSIS OF SYNCHRONIZED EXCAVATION OF EXTRA LARGE-SCALE ADJACENT RIVERSIDE DEEP FOUNDATION PITS IN SOFT SOIL

Based on the field data of two extra large-scale riverside adjacent deep foundation pits in soft soil，the mutual impact of synchronized excavation of adjacent deep foundation pits，such as deformation characteristics of retaining walls，mutual impact on the axial forces of struts and the settlement of pillars were analyzed. The results show that the deformation of the retaining wall in the adjacent central position of foundation pits tends to increase，while those in the corner and in the positions away from the adjacent location are less affected by the adjacent pits excavation. The vertical displacement at the top of the retaining wall in the adjacent area is affected by the adjacent foundation pits excavation；and the horizontal displacement at the top of the retaining wall in the adjacent area increases when the distance between the foundation pits reduces. It is also concluded that the axial force of struts tends to decrease after reaching the peaks，while the vertical displacement of pillars keeps increasing. Comparing the deformation of retaining wall and settlement outside the pits with the classical theory，the retaining walls? deformation in the adjacent area is different from that of a single one.