地下室與連續壁基礎建築物液化受震行為: 離心模型試驗

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Title:	地下室與連續壁基礎建築物液化受震行為: 離心模型試驗
Authors:	詹瑋誠;Chan, Wei-Cheng
Contributors:	土木工程學系
Keywords:	離心模型試驗;土壤液化;地下室基礎;連續壁基礎;centrifuge model;soil liquefaction;basement;diaphragm wall
Date:	2022-07-21
Issue Date:	2022-10-04 10:45:15 (UTC+8)
Publisher:	國立中央大學
Abstract:	臺灣位於地震頻繁的歐亞板塊交界帶，土壤液化常伴隨著地震而發生，對於高潛勢區經常造成生命財產的損失。本研究進行一系列離心模型試驗，針對不同形式的深基礎建築物進行離心模型的受震反應分析，深基礎結構包括一層地下室基礎、二層地下室基礎、筏式基礎與連續壁基礎，於試驗過程中量測各式物理變化量，探討深基礎建築物於液化地盤的動態反應。試驗結果顯示：在乾淨砂土層且地下水位在地表的地盤下使用一層或二層的地下室基礎搭配七層樓建築物皆不穩定且受震後會發生嚴重傾倒，當降低地下水位後可提高建築物的穩定性且大幅抑制建築物的沉陷量與旋轉變化量 ; 試驗中建築物大部分的沉陷量與旋轉變化量皆發生在受震過程中，當基礎版底面積越大承受的上浮力就越明顯；當超額孔隙水壓向上激發時會使建築物基礎版的土壓力下降，隨著超額孔隙水壓的消散，土層會重新獲得有效應力且重新排列，令土壓力逐漸上升並趨於穩定 ; 連續壁1F基礎版中心與邊緣受到正、負彎矩的作用，因此在彎矩歷時觀察到尖峰反向的行為，由於受震後建築物本身的慣性力作用，建築物左右搖擺產生反覆拉、壓，因此連續壁基礎底部兩側的土壓力歷時也觀察到尖峰反向的行為 ; 貫入非液化層的連續壁基礎在所有試驗中對於抑制建築物沉陷量的效果最好，但由於周圍土壤沉陷較多造成連續壁基礎表面存在負摩擦力，對建築物產生額外下拉力，觀察到連續壁基礎底部的接觸應力超過原先之設計值。 ;Taiwan is located in the junction of the Eurasian plate with frequent earthquakes. Soil liquefaction often occurs along with earthquakes, which often causes loss of life and property in high-potential areas. In this study, a series of centrifuge model tests were carried out to analyze the seismic response of centrifuge models for different types of deep foundation buildings. The deep foundation structure includes one-story basement foundation, two-story basement foundation, raft foundation and diaphragm wall foundation. Various physical changes were measured during the test to explore the dynamic response of deep foundation buildings on liquefaction sites. The test results show that the use of one- or two-story basement foundations with seven-story buildings in pure sandy soil layers and the groun15F-DWater level below the surface is unstable and will collapse seriously after an earthquake. When the groun15F-DWater level is lowered, the stability of the building can be improved and the settlement and rotation change of the building can be greatly suppressed. Most of the settlement and rotation changes of the building occurred during the earthquake. The larger the area of the base plate, the more obvious the buoyancy. As the excess pore water pressure dissipates, the soil layer will regain the effective stress and rearrange, so that the earth pressure gradually rises and becomes stable. The diaphragm wall foundation penetrating the non-liquefied layer was the effect of restraining the building settlement is the best, but due to the surrounding soil settlement, there is a negative friction force on the surface of the diaphragm wall, which causes the building to be subjected to additional pull-down force around the building, so that the contant pressure at the bottom of the diaphragm wall exceeds the design value.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

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