Test and numerical research on wall deflections induced by pre-excavation dewatering |
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Affiliation: | 1. Department of Civil Engineering and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Via Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061, USA;3. Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;4. LUNAM University, Ecole Centrale de Nantes, GeM UMR CNRS, 6183 Nantes, France;1. GHS, Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Barcelona, Spain;2. GHS, Dept. Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, UPC-BarcelonaTech, Barcelona, Spain;1. University of Liege, Hydrogeology & Environmental Geology, Aquapole, ArGEnCo Dpt, Engineering Faculty, B52, 4000, Liege, Belgium;2. GHS, Institute of Environmental Assessment and Water Research (IDAEA), CSIC, Barcelona, Spain |
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Abstract: | Numerous studies have been devoted to the performance of excavations and adjacent facilities. In contrast, few studies have focused on retaining wall deflections induced by pre-excavation dewatering. However, considerable inward cantilever deflections were observed for a diaphragm wall in a pre-excavation dewatering test based on a long and narrow metro excavation, and the maximum deflection reached 10 mm (37.6% of the allowable wall deflection for the project). Based on the test results, a three-dimensional soil–fluid coupled finite element model was established and used to study the mechanism of the dewatering-induced diaphragm wall deflections. Numerical results indicated that the diaphragm wall deflection results from three factors: (1) the seepage force around the dewatering well and the soil–wall interaction caused the inward horizontal displacement of the soil inside the excavation; (2) the reduced total earth pressure on the excavated side of the diaphragm wall above approximately 1/2 of the maximum dewatering depth disequilibrated the original earth pressure on both sides of the diaphragm wall; and (3) the different negative friction on the excavated and retained sides of the diaphragm wall led to the rotation of the diaphragm wall into the excavation. |
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Keywords: | Dewatering Wall deflection Mechanism Seepage force Stress path |
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