Behavior of an Earth Retaining Wall during Deep Excavation in Shanghai Soft Ground (IS-TOKYO'1999 「軟弱地盤における地下建設の地盤工学的諸問題」特集号)

概要

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In this paper, simulation methods and measurement systems for earth retaining structures during deep excavation work in Shanghai, China are discussed. Comparisons between the measured and simulated data are made, and the inverted construction method for underground works is also evaluated. The main results are as follows : (1) The maximum wall displacement was more than 10 cm in the first excavation stage, and reached a value of approximately 13 cm in the final stage excavated to a depth of 18 m below G.L. (2) In the simulation analysis, the stiffness of the ground on the excavation side was reduced to model the presence of vertical voids induced from the installation of plastic-board drains and other pre-excavation construction. The stiffness of the earth retaining wall was also reduced due to the cracks in the concrete. With these modifications, the results of the simulation analysis showed values quite similar to the measured data. (3) The measuring system worked flawlessly except for minor problems in the installation of the sensors and occasional breakdowns of the inclinometers. (4) During the excavation, real time simulations were conducted by using the most current measurement results to predict behavior in subsequent excavation stages. Consequently, the originally planned No. 4. temporary struts were eliminated, and the excavation was successfully completed to the designed depth.
社団法人地盤工学会の論文
1999-06-15