建築物抗液化性能評估與提升對策之研究-建築物液化防治試驗與評估技術之開發-深基礎結構工法(總計畫及子計畫五)(I);Model Tests and Assessment Techniques for Mitigating Liquefaction Damage of Building: Deep Foundation Countermeasures.

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題名:	建築物抗液化性能評估與提升對策之研究-建築物液化防治試驗與評估技術之開發-深基礎結構工法(總計畫及子計畫五)(I);Model Tests and Assessment Techniques for Mitigating Liquefaction Damage of Building: Deep Foundation Countermeasures.
作者:	黃俊鴻;洪汶宜
貢獻者:	土木工程學系
關鍵詞:	土壤液化;深基礎;離心模型試驗;建築物沉陷;soil liquefaction;deep foundation;centrifuge model test;settlement of building
日期:	2020-12-08
上傳時間:	2020-12-09 09:26:01 (UTC+8)
出版者:	科技部
摘要:	針對研究課題「4-4 結構之耐震安全評估方法與補強技術開發」中「土壤液化防治對策與工法研究」項目而言，目前建築物液化防治工法與對策非常多元，視建築物的重要性，所要求的性能與及防治工法的費用與適用性，而有不同的選擇，例如基礎結構工法、固結工法、加密工法和地下水控制工法等。對於小面積與低樓層之建築結構物，基於液化防治的經濟規模，宜以基礎結構工法為最先考量。而本人前期研究計畫已針對不同尺寸淺基礎與筏式基礎之低層樓建築物進行一序列動態離心模型試驗，得到淺基礎尺寸增大抑制建築物沉陷與傾斜之效果與基礎版反力變化之試驗結果。由於淺基礎加大尺寸工法雖可部分減少低矮建築物液化變形量，但無法達到大量減少建築物液化變形量之效果。因此本研究聚焦在使用深基礎結構以顯著降低建築物液化變形量之成效，擬研究的深基礎種類包括地下室基礎與連續壁基礎，以及小口徑樁基礎等工法，期望以較經濟之深基礎設計方案，達到抗液化的效果。擬採用的研究方法主要為進行離心機動態模型試驗，由試驗結果先觀察瞭解建築物與深基礎及液化土之動態互制行為，再輔以數值分析方法以建立評估液化防治效果的評估技術。期望藉由本三年期計畫建立以深基礎抑制建築物液化變形量之模型試驗資料庫與數值評估方法，供工程界及學術界參考與持續研究使用。 ;Currently, there are many countermeasures have been developed to mitigate liquefaction induced damages of buildings and to prevent liquefaction occurrence. The selection of the countermeasure against liquefaction must consider the importance and the required performance of building structures, the cost and applicability of the countermeasure. For example, foundation reinforcement method, solidification method, densification method, and ground water controlling method may be selected. Among them, the foundation reinforcement method is usually the top priority choice for ordinary small area and low-rise buildings when considering engineering economy. In the previous studies, the applicant has performed several dynamic centrifuge tests to investigate the reducing effect of post-liquefaction settlement and tilt of low-rise building by increasing the dimensions of shallow foundation seating on liquefiable deposit. The preliminary results showed that the reducing effect did exist but not significant. Therefore, this project will focus on the use of deep foundation for reducing the settlement and tilt of buildings. The deep foundations that will be studied include small size pile, basement (partial floating) foundation, and slurry wall. The small size pile and basement foundation are used for low-rise buildings. The slurry wall is used for medium high-rise buildings. It is hoped to develop a more economic design strategy of deep foundation for mitigating liquefaction hazard to the buildings. This is a three-year project. In the first two years, the experimental works include dynamic centrifuge tests and laboratory tests. A series of centrifuge tests will be performed to investigate the reducing effect of post-liquefaction deformation of building by using small size pile, basement foundation and slurry wall with variable number of floor and penetration depth into non-liquefying layer. The laboratory works will include the tests of physical index test, triaxial test, cyclic direct simple shear test and resonant column test on the sand used to prepare the model ground in the centrifuge. All the parameters of the test sand will be used in the numerical calibration work in the third year. In the third year, the numerical model for simulating the liquefied soil-pile-structure interaction will be established using FLAC2D Ver.8.0. The numerical analysis will be a fully dynamic effective stress analysis taking the pore pressure generation, dissipation and nonlinear modulus degradation into account. The parameters of the PM4 constitutive law will be calibrated by the laboratory test results in the previous two years. Then, numerical tests will be carried out by varying different design conditions and compare the calculated results with those measured by dynamic centrifuge tests. Through the project, it is expected to establish a complete research data base of the centrifuge test, laboratory test and numerical test for investigating the reducing effect of post-liquefaction deformation of building by using deep foundation method. It is also hoped this data base can be continually used and referenced by anyone who is interested in this topic.
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
顯示於類別:	[土木工程學系 ] 研究計畫

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