The Influence Of Large Shaped By Deep Excavation On Adjacent High-buildings

Considering the coupling relationship between the deformation of foundation pit and surrounding soil,the coupling relationship between the deformation of surrounding soil and the deformation of buildings,an overall analysis model including the foundation pit itself and adjacent high-rise buildings is established,and the deformation characteristics of foundation pit itself,surrounding soil and adjacent high-rise frame structures are analyzed in detail.The main conclusions are as follows:(1)The spatial shape of the foundation pit affects the settlement of the floor near the highrise building and the horizontal displacement of the structural column,which is mainly manifested as the pit angle effect.The deformation of the corresponding component near the angle side of the right angle pit is smaller than that of the corresponding component on the side with the pit angle greater than 90 °.(2)The floor of the building shows overall settlement.The closer to the foundation pit,the greater the settlement.With the increase of the embedded depth of the underground continuous wall,the settlement of the floor of the building decreases.For the floor of the building with pile foundation,the settlement of the floor of the building decreases obviously with the increase of the pile length.For the floor of the building with raft foundation,the thickness of the raft increases Compared with raft foundation,pile foundation has a significant effect on the settlement of building floor.(3)When the adjacent high-rise building foundation is pile foundation,the horizontal displacement of the structural column along the longitudinal distribution of the building increases approximately linearly with the increase of the height,and the horizontal displacement of the structural column along the transverse distribution of the building increases nonlinearly with the increase of the height;at the same height of the structural column in the longitudinal direction of the building,the vertical horizontal displacement is similar,and the horizontal displacement increases with the height within a certain height range When the height is over,the horizontal displacement of the column increases linearly;(4)When the adjacent high-rise building foundation is raft foundation,the horizontal displacement of the structural column increases linearly with the increase of height,and the horizontal displacement of the structural column along the horizontal distribution decreases with the increase of the distance from the foundation pit at the same height;the horizontal displacement of the structural column along the vertical distribution and the structural column at different positions at the same height is the same Caused by;(5)The embedment depth of diaphragm wall mainly affects the settlement of soil around the foundation pit and the lateral displacement of diaphragm wall itself.Within a certain range of insertion ratio,the horizontal displacement and settlement of soil around the foundation pit and the lateral displacement of diaphragm wall decrease with the increase of embedment depth of diaphragm wall.(6)The foundation pit dewatering construction has a significant impact on the adjacent highrise buildings,while the foundation pit dewatering construction has a small impact on the adjacent high-rise buildings.