Ground Displacement and Adjacent Building’s Response due to Long-shape Excavation

• Main Authors: Ming-Hui Wang, 王明輝
• Other Authors: Horn-Da Lin
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/2u9269

碩士 === 國立臺灣科技大學 === 營建工程系 === 94 === A long-shape excavation of a MRT station was carefully monitored to study the response of the ground and adjacent buildings caused by the process of deep excavation. In-situ measured results indicate that the maximum ratio of the wall displacement to the excavation depth is in the range of 0.42％ to 0.7％. The wall deflection is the deep-inward-movement type; and the ground surface settlement is the concave type. The range is 0.46 to 0.57 for the maximum ratio of the wall displacement to the maximum ground surface settlement . The amount of the wall displacement is very limited due to strut removed. The submergence of the raft-foundation building is smaller than the ground surface settlement; the settlement of spread footing is larger than the ground surface settlement. However, both raft-foundation or spread footing, the direction of building tilting and angular distortion may change if the settlement is the concave type. Also it must be noticed that buildings of long-shape and raft-foundation could be subjected to significant local angular distortion. Observation from the horizontal strain measurement indicates that the building nearby the excavated zone may change from tension strain to compressive strain accompanied by the concave type ground submergence. In addition, this study shows that it is more rigorous to consider both angular distortion and horizontal strain simultaneously for the building safety evaluation.