| Summary: | 碩士 === 國立成功大學 === 土木工程學系 === 87 === In this paper, the analytic model of excavation was investigated by using 2-D plane strain mode and considering large geometric deformation principle based on theory of continua mechanics. Soils were modeled as elastic-perfectly plastic materials, and other materials were elastic. The interactive behaviors between soil and structure were calculated by finite difference program-FLAC. From this, the analytic outcomes were compared to the site monitor''s observations of Tainan Hain-Raod Underground deep excavation for exploring the practicality of this analytic model. In this paper, three influential parameters were studied, i.e., elastic modulus of soils, stiffness of slurry wall, and strut preloading. The results showed that the elastic modulus of soils under bottom of slurry wall made significant influences on the lateral displacement of slurry wall. It is more representative to use effective moment of inertia than moment of inertia of gross area to calculate the stiffness of slurry wall while the cracking of concrete occurred. There were also significant influences on moment of slurry wall for different strut preloading. After intensive study of back analysis, the final analytic results of the lateral displacement and moment of slurry wall were coincide with the site monitor''s observations.
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