Abstract
Concrete diaphragm walls (CDWs) are widely used as support of deep excavation in soft ground in urban areas. Ground deformation occurs during the excavation of trenches for the installation of the CDW panels due to ground stress release. This paper investigates the ground deformation during slurry trenching using Mindlin solution. The pressure of slurry used to protect the trench stability during excavation is simulated as a triangularly distributed load on the trench walls, the soil stress state is solved using Mindlin solution, and the horizontal and vertical ground displacement are obtained through integral transformation of ground strain. The rationality of the solution is verified through comparison between the analytical solution and field measurement. Sensitivity analyses are performed on soil elastic modulus, Poisson's ratio, trench excavation depth and panel length. Simplified formulation is proposed for the prediction of horizontal ground deformation. The impact of excavation stages and adjacent panels on the ground deformation is explored. The study finds that the Mindlin solution is able to provide an approximate solution on the ground deformation during slurry trenching, and the simplified formulation can be used to provide a fast estimate of the horizontal ground movement in engineering practice.
Highlights
Concrete diaphragm walls (CDWs) are widely used as support of deep excavation in soft ground in urban areas
Field observations show that the slurry trenching induced ground settlement could account for 40 to 50% of the total ground settlement during the process of deep excavation supported by CDWs2–4
In order to verify the validity of the Mindlin solution, this paper takes the full scale field test of a slurry-trench excavation in Oslo, Norway as the background[21], which especially investigated the deformations of the surrounding ground and the stability of the trench during the trench excavation and a subsequent resting period under slurry support, There were 14 gauges placed to determine soil movements, 10 along the vertical centerline of the trench and 5 in a horizontal plane at a depth of 15.5 m
Summary
Concrete diaphragm walls (CDWs) are widely used as support of deep excavation in soft ground in urban areas. The pressure of slurry used to protect the trench stability during excavation is simulated as a triangularly distributed load on the trench walls, the soil stress state is solved using Mindlin solution, and the horizontal and vertical ground displacement are obtained through integral transformation of ground strain. The study finds that the Mindlin solution is able to provide an approximate solution on the ground deformation during slurry trenching, and the simplified formulation can be used to provide a fast estimate of the horizontal ground movement in engineering practice. The horizontal concentrated force in Mindlin solution is transformed into a triangular distributed load, which is applied to the side of the diaphragm wall to simulate the difference between the slurry pressure and the static lateral soil pressure. The Mindlin solution is integrated to calculate the horizontal and vertical displacement of the surrounding soil caused by the construction of the diaphragm wall in the semiinfinite homogeneous stratum
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