A modified oblique bracing supporting system was used in supporting construction of foundation pit for a shopping mall in Jinan city

which occupies more than 50000 m

2

.The oblique bracing supporting system

which is different from normal pattern

includes supporting piles

oblique bracing constructions

vertical pillars and struts.Through the analysis of explicit finite difference numerical calculation with FLAC

3D

program

considering the results of in-situ monitoring of supporting piles

some conclusions are drawn on the displacements of the supporting system

and the effects of supporting constuctions.It indicates that the supporting constructions in the system are fully utilized to work with the soil at the bottom of pit

to resist the soil pressures caused by foundation pit excavation

and that the displacements of soil around the pit are reduced.Furthermore

the normal operation of roads

underground lines

and buildings surrounding the pit are ensured under the effective support of the system.