Abstract
Accurate prediction of surface settlements is a primary concern when deep excavations were carrying out under the water table in urban environments for the safety of the work site. The sedimentation deformation due to deep excavation of foundation pit and dewatering occurs as a result of coupling action of the two factors. The study is aimed at revealing the coupling ground response to the two factors and developing empirical correlations for estimating ground deformations. Taking a deep foundation pit of a metro station as an example, surface settlement estimations were calculated by analytical formulas and numerical models. The settlement results by analytical formulas under excavation and dewatering conditions were added linearly to the total settlements. And three‐dimensional coupling numerical models were established by applying commercial software (GMS and MIDAS) to investigate the interaction impact of excavation and dewatering on the sedimentation deformation. Comparing with monitoring data, numerical simulation results match well with the monitoring data. Furthermore, an empirical surface subsidence correlation equation was developed by the polynomial fitting to illustrate the effect contribution on the total surface settlement of foundation excavation and dewatering.
Highlights
Deep underground constructions built below the water table are inevitable in the urban region with the continuous city development
Most of the main theories about settlement caused by excavation are based on the total stress method proposed by Peck based on curve-fitting of an enormous amount of field monitoring results [8,9,10,11]. e monitoring data show that the calculation results underestimate the actual settlement
Differences between measurements and theoretical predictions could be attributed to the effect of dewatering. e dewatering process can cause the depressurization of aquifers triggering the changes in effective stresses
Summary
Response Analysis of Deep Foundation Excavation and Dewatering on Surface Settlements. E sedimentation deformation due to deep excavation of foundation pit and dewatering occurs as a result of coupling action of the two factors. E study is aimed at revealing the coupling ground response to the two factors and developing empirical correlations for estimating ground deformations. Taking a deep foundation pit of a metro station as an example, surface settlement estimations were calculated by analytical formulas and numerical models. Three-dimensional coupling numerical models were established by applying commercial software (GMS and MIDAS) to investigate the interaction impact of excavation and dewatering on the sedimentation deformation. An empirical surface subsidence correlation equation was developed by the polynomial fitting to illustrate the effect contribution on the total surface settlement of foundation excavation and dewatering
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