Figure 6

Geological profile at A-A section. There are seven exploratory borings along the A-A section in for the deep foundation pit, and the obtained geological profile is shown in the figure. The surface of the construction site is covered with approximately 0.5 m of plain fill soil; The underlying expansive soil layer has a thickness about 0.7 m to 12.7 m; fully-weathered, strongly weathered and moderately-weathered argillaceous sandstone are distributed below the expansive soil layer.