計畫資訊 NCREE-R2007001

Project Information / 計畫資訊

Project ID. / 計畫代碼	NCREE-R2007001
主持人	翁作新
PI	Tzou-Shin Ueng
單位	國震中心
Organization	NCREE
計畫名稱	土壤液化及土壤-基樁-結構互制反應之探討
Project Name	The study on soil liquefaction and soil-pile-structure interaction
Project No. / 計畫編號
Keywords / 關鍵字	soil liquefaction, shear box, pile , SSI
Begin Date / 計畫啟始	2007/1/1
End Date / 計畫結束	2007/12/31
Abstract / 摘要	由於地震力作用所引致砂土之超額孔隙水壓激發，而產生液化破壞，往往造成重大的災害。為了解此一現象發生之行為以及液化災害之防治，必須針對土壤因受地震引起之地盤受震反應與液化特性予以研究。同時土壤受震時，地表下孔隙水壓變化對於土壤與結構互制行為也會有相當程度的影響，因此必須要考慮地盤受震及液化過程中土壤與結構互制關係之行為。本計畫針對前述需求而提出，利用所研發之大型雙軸向多層剪力試驗盒，配合國家地震工程研究中心之大型振動台進行試驗，已於91-94年間進行振動台土壤試體液化試驗及在95年進行水力回填砂土試體準備研究，成果豐碩。本年度計劃將持續進行越南砂及水力回填砂土在不同參數條件下之振動台試驗，並配合國科會所執行之大地地震工程相關專題計畫之試驗需求，針對一維及二維運動模式的不同，探討其對砂土受震反應與液化現象之影響。另外，亦同時進行模型樁土側向載重試驗以了解土壤-結構互制關係影響。由振動台試驗成果，可了解現地土壤液化機制以及地盤受震土壤中振動傳遞現象，驗證現有地盤反應與土壤液化之分析模式與設計方法，並可建立大型物理模型試驗與傳統室內元素試驗所得土壤動態特性之關係。
Abstract	Earthquake shaking induces pore water pressure generation that in turn can cause soil liquefaction. Soil liquefaction and associated structural damage during strong earthquakes are serious problems causing losses of lives and properties. Cities located at soft alluvial deposits and the undergoing hydraulically reclaimed lands for industrial parks are both susceptible to soil liquefaction. Thus, it is necessary to study the seismic ground motions and induced liquefaction including soil-structure interaction in these areas and their remedial measures. A large-scale biaxial laminar shear box was thus developed and designed to be used on the shaking table at NCREE that a large soil specimen can be tested under one- and two-dimensional earthquake shakings. The manufacture, testing, and instrumentation of the shear box and evaluation of sample preparation using the wet sedimentation method have been completed. A series of liquefaction tests on Vietnam sand using the large shear box on the shaking table at NCREE was conducted in 2002 and 2006. This year we continue to perform the shaking table tests on Vietnam sand and hydraulic reclamation sand using the large shear box. The tests will also provide the needed data for other studies on geotechnical earthquake engineering. In addition, a preliminary research on soil - structure interaction (SSI) will be carried out in this year by using the lateral load test on the model pile. From the test results, we can better understand the liquefaction mechanism and ground shaking responses, verify the existing models for ground motion analyses under seismic loading, and explore the technical ability for large-scale model tests. Moreover, these data are valuable for establishing liquefaction evaluation criteria and improving seismic design and disaster prevention concerning soil liquefaction.

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Experiments / 實驗清單

實驗代號 Experiment ID	實驗名稱	Experiment Name	地點 Site	設施 Facility	實驗類型 Type	試體材料 Material	說明	Description
p-cyclic	模型樁動態反覆側向載重試驗	Dynamic lateral loading test on model pile	NCREE	Reaction wall & strong floor		Steel pipe	A series of dynamic lateral loading tests on model pile were also conducted in May, 2007. There are totally 12 tests in this experiment. This test is controlled by the displacement of pile top with various amplitudes and frequencies.	A series of dynamic lateral loading tests on model pile were also conducted in May, 2007. There are totally 12 tests in this experiment. This test is controlled by the displacement of pile top with various amplitudes and frequencies.
p-static	模型樁準靜態側向載重試驗	Quai-static lateral loading test on model pile	NCREE	Reaction wall & strong floor		Steel pipe	A series of quai-static lateral loading tests on model pile were conducted in May, 2007. There are totally 4 tests in this experiment. This test is controlled by the displacement of pile top, and the amplitude is ranged from 1-5 mm in one cycle.	A series of quai-static lateral loading tests on model pile were conducted in May, 2007. There are totally 4 tests in this experiment. This test is controlled by the displacement of pile top, and the amplitude is ranged from 1-5 mm in one cycle.
sp-cyclic	飽和砂土中模型樁動態反覆側向載重試驗	Dynamic lateral loading test on model pile in saturated sand	NCREE	Reaction wall & strong floor		Steel pipe in the saturated sand	A series of dynamic lateral loading tests on model pile were also conducted in May, 2007. There are totally 11 tests in this experiment. This test is controlled by the displacement of pile top with various amplitudes and frequencies.	A series of dynamic lateral loading tests on model pile were also conducted in May, 2007. There are totally 11 tests in this experiment. This test is controlled by the displacement of pile top with various amplitudes and frequencies.
sp-static	飽和砂土中模型樁準靜態側向載重試驗	Quai-static lateral loading test on model pile in saturated sand	NCREE	Reaction wall & strong floor		Steel pipe in the saturated sand	A series of quai-static lateral loading tests on model pile in saturaed sand were conducted in May, 2007. There are totally 4 tests in this experiment. This test is controlled by the displacement of pile top, and the amplitude is ranged from 1-5 mm in one cycle.	A series of quai-static lateral loading tests on model pile in saturaed sand were conducted in May, 2007. There are totally 4 tests in this experiment. This test is controlled by the displacement of pile top, and the amplitude is ranged from 1-5 mm in one cycle.