Field monitoring and numerical modeling in an excavation stabilized by Top-Down method (A case study)

Stress changes due to deep excavations will cause ground deformations near the excavated site. Deformation control in the vicinity of worn-out urban textures and important buildings is crucially significant. Prediction of ground deformation trends needs numerical modeling which should be calibrated with field studies; therefore, the accuracy of monitoring tool should be investigated in the field precisely. In this study, field monitoring and numerical modeling of an excavation stabilized by Top-Down method using total station in an overcrowded street in the city of Qom in Iran is implemented. In this project, construction sequences in Top-down excavation are monitored and the obtained data are analyzed frequently. Depending on the evolved information and the calibrated model, designation or construction stages in stabilization could be reconsidered to secure the excavation or to enhance the economy of the project. The quality of the gathered data in this method is of high importance which should be evaluated using statistical analysis to determine the precision of the monitoring tool. According to the conducted statistical analysis, the accuracy of Total Station in this study is appropriate for monitoring and construction technique in this project. However, using more accurate tools in monitoring high-risk excavations is emphasized.