FIELD MEASUREMENT AND ANALYSIS OF THE RESPONSE OF GROUND SURFACE AND BUILDINGS TO ADJACENT EXCAVATION BY OPEN-CUT METHOD

The responses of adjacent high buildings to a deep excavation of subway station constructed by open-cut method in dual structure soil of Changsha were analyzed． First，the subsurface conditions，adjacent buildings， excavation scheme and monitoring project were introduced． Next，the lateral displacements of diaphragm wall and settlements outside the excavation were analyzed; the settlement and characteristics of inclination and deformation of high buildings were analyzed emphatically． Compared with the settlement law of multistory buildings in soft clay，the settlement of high buildings showed that there were less impact on the construction of diaphragm wall and dewatering inside the excavation; building settlements were less than those of the surface; there were rotations and rise on the buildings; there were some proportional relations between the distances of the buildings to the excavation，length-width ratios，and settlements，deformations．