既有建物舊基礎改建時考慮既有連續壁緊貼地界，為維持最大使用空間新建連續壁僅能緊鄰舊有連續壁內側構築，本研究之目的為探討兩者於重疊深度內之複合壁體於後續開挖拆除時壁體變形量，用以
瞭解複合壁體之特性，再以假設案例提出不須全工區回填完成深導溝之流程，且增設扶壁及地中壁以抑制後續開挖時之變形，供未來實務上於既有建物地下建物更新之參考。
新舊連續壁重疊深度內之複合壁體於後續開挖拆除作業有相當一致之側向位移，本研究提出於PLAXIS 中以一線彈性材料之體積元素作為新舊連續壁間夾層，使兩者側向變位於開挖階段趨於相同以共同承擔土水壓力，再以一現正進行且施工方式相似之實際案例檢核其正確性。為瞭解扶壁與地中壁於不同新連續壁厚度下之效益，亦於假設案例進行一系列之參數研究。研究顯示，扶壁受新連續壁厚度而間接影響其表面摩擦力發揮程度；而地中壁則與一般開挖案例設置之相同，若設置之高程範圍係於壁體可能發生最大側向變位處，便能有相當程度之抑制效果。

Consider that the existing diaphragm wall is close to the property line when
reconstructed the old foundation of the existing building. In order to maintain the maximum usable space, the new diaphragm wall can only be constructed next to the inner side of the existing diaphragm wall. The purpose of this study is to explore and understand the characteristics of the wall deformation in the overlapping depth of composite walls during the subsequent excavation and demolition stage. And then, a hypothetical case is used to propose the process of completing the deep guide wall without backfilling the whole area and adding the buttress and cross walls to restrain the wall deformation for engineering practice reference in the urban renewal of existing underground buildings.
The composite walls in the overlapping depth have a quite uniform displacement in the subsequent excavation and demolition stages. So, a volume element of linear-elastic non-porous material in PLAXIS is used to propose as an interlayer between the existing and new diaphragm walls which cause the uniform lateral deformation to undertake the soil lateral and water pressure in the subsequent stages. Afterward, apply the same method of simulation to predict the wall deflections of ongoing urban renewal case to understand the effects of the buttress and cross walls under different new diaphragm wall thicknesses and also a series of parameter studies would be conducted in the hypothetical case. The study indicates that the buttress wall’s surface frictional resistance is affected by the new diaphragm wall thicknesses. However, the cross walls are similar to those general excavation cases if the setting elevation at the wall may have the greatest possible lateral displacement then can have a good restrain effect.

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