ABSTRACT
According to the deep foundation pit construction of a subway station project, the construction risk factors of foundation pit were identified from two aspects of engineering risk and environmental risk, and the occurrence mechanism was analyzed. Based on the fuzzy comprehensive evaluation method, the analysis model of construction risk has been established, and the weight values of risk factors were determined by analytic hierarchy process, then the risk during construction has been analyzed qualitatively and quantitatively. Results show that the construction of the deep foundation pit engineering has higher risk in the aspects of foundation pit collapse, formwork collapse, incline or crack of surrounding buildings, and damage of pipeline, and some necessary measures should be taken during the construction. According to relative risk factor, the control methods and suggestions have been put forward from some aspects of bored pile construction, suspending pile construction, anchor cable construction, drilling and blasting construction of foundation pit, formwork system construction, and foundation pit deformation control, surrounding pipelines and building protection.
