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|Title: ||用過核子燃料最終處置場緩衝材料之潛變實驗及數值分析;Experimental and Numerical Analysis on Creep of Buffer Material in Nuclear Waste Deposition Hole|
|Authors: ||艾瑞莎;Syafiarti, Arintha Indah Dwi|
|Keywords: ||緩衝材料;膨潤土;潛變參數;角應變;潛變位移;Buffer material;Bentonite;Creep parameters;Strain rate;Vertical displacement|
|Issue Date: ||2019-04-02 14:07:34 (UTC+8)|
本研究透過單軸壓密試驗及直接剪力試驗，以取得SPV200膨潤土的潛變參數。單軸壓密試驗是將膨潤土壓實後的不飽和試體，放入單軸壓密試驗儀中，垂直載重從0.6 MPa開始加載至4.8 MPa。由應變控制剪力試驗中取得應力控制剪力試驗所需的數據，以進行應力控制剪力試驗，其發現在高剪力強度下試體含水量減少且試體乾密度會增加。而應力控制剪力試驗的試體分別為含水量29.2%的壓實試體以及在剪力盒上經水壓飽和的試體。
;The buffer material serves a major function in the multiple barrier system for containment of spent nuclear fuels in a geological respository. The deposition hole of high-level nuclear spent fuels components are affected by thermal (T), hydrological (H), mechanical (M), and chemical (C) processes from the near field, referred to as T-H-M-C coupling effects. Bentonite as buffer material is affected by T-H-M-C coupling effects, needs to keep the emplaced canister physically stable to avoid damage caused by displacements and movements initiated by the weight of the canister and stresses exerted by other components of the barrier system.
One-dimensional compression test and direct shear test were performed to determine the creep parameters of SPV200 bentonite. The unsaturated sample compacted and the loading increment for one-dimensional compression test from 0.6 MPa to 4.8 MPa were applied. The strain-controlled direct shear tests were done for obtaining the shear strength of SPV200 bentonite, such that the loading sequence for stress-controlled direct shear test can be obtained. SPV200 bentonite was found to have high shear strength as water content decreases and dry density increases. Stress-controlled direct shear test were run on compacted samples at a saturation water content of 29.2% and on sample saturated in the shear box.
Numerical simulations using ABAQUS were performed on a model incorporating all barrier components in a deposition hole, including the buffer material, the canister, the backfill, and the host rock. The instantaneous settlement caused by canister weight is 0.37 mm as the result of simulation in the first step. The creep parameters obtained from laboratory works were applied as the input for numerical simulation. The creep parameters obtained from direct shear test shows the angular strain rate is higher than the reference. The buffer material was predicted to get fully saturated in 400 years. It is shown that the buffer material under the canister moves upward due to the creep in 100,000 years of time period. And the largest vertical displacement was found to be located at the interface of buffer and backfill caused by the swelling pressure after saturation.
|Appears in Collections:||[土木工程研究所] 博碩士論文|
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