Figure 9

The construction conditions and rainfall during the monitoring period (a) the three types deformation curves along with the rainfall and construction information; (b) treatment measures for controlling the deformation at section I-I. (a) Shows that the whole deformation process curves of the retaining piles for different measuring points can be divided into three types, as stable, less stable and unstable types, respectively. The measuring deformation curves at measuring points ZA13, ZA7 and ZA5 are typically stable, less stable and unstable types of curves respectively. And the construction conditions and rainfall during the deformation monitoring period are also shown in (a). (b) Shows the treatment measures for controlling the deformation at section I-I. The horizontal deformation of the measurement point ZA5, near section I-I, exceeded 30 mm in mid-April. In order to control the deformation, the back-pressure was applied locally on the north side of the bottom of the foundation pit in late-April. In late-May, the maximum deformation rate at ZA5 reached 7.6 mm/d. In order to further control the deformation and prevent collapse of the foundation pit, partial excavations outside of the retaining piles both on the north and south sides of the foundation pit were carried out on 2th June.