Influence of Neighboring Buildings on Deep Excavations

• Main Authors: Chen, Yue-rong, 陳樂融
• Other Authors: Chen, Shong-loong
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/3fft45

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 105 === This study was designed to investigate the influence of neighboring buildings on deep excavation in terms of displacements in retaining structures and surrounding soil. Traditionally, neighboring buildings were included in numeric analysis in the form of surface surcharge. For the purpose of this study, PLAXIS 3D AE, a finite element method program, was introduced for the analysis on the influence of neighboring buildings on deep excavation. Only top-down excavation was simulated. Slab elements were used to simulate the retaining structure of diaphragm wall with H-steels for strutting. Pre-stressing was added with anchor rods to complete the entire system of strut supports for the deep excavation. The neighboring building structures were simulated with slab elements. The results indicated that the lateral displacement along the retaining structure changed with the depth of basement in neighboring buildings. The displacement was relatively large with the basement depth half of excavation depth. As the depth increased to 1.7 times of excavation depth, the displacement converged to a certain value. When the neighboring buildings were twice as far as the excavation depth, the wall displacement curve converged to the curve of “no load.” That is to say, when a neighboring building is located more than twice as far as the excavation depth, the influence of this building on the retaining wall structure is negligible as far as the diaphragm wall displacement analysis is concerned. When the neighboring building is located within the same distance as the excavation depth, the depth of the maximum lateral displacement is closer to the ground level as the building becomes closer to the diaphragm wall. When the neighboring building is located at exactly the same distance as the depth of excavation, the maximum lateral displacement is located at approximately the excavation level. As the basement depth of neighboring building increased to half of the excavation depth, the ground settlement became relatively large, and gradually approached to a certain value as the basement depth increased to 1.6 times of the excavation depth. The ground settlement became larger as the neighboring building moved toward the diaphragm wall and smaller as it moved away.