低放射性廢棄物最終處置場膨潤土阻水層之潛變試驗與變形分析

本研究根據我國低放射性廢棄物最終處置場的初步設計概念，探討處置坑內膨潤土阻水層之潛變行為模式。試驗研究發現MX80膨潤土飽和前後抗剪強度存在較大差異，且其定體積回脹壓力、水力傳導能力均符合相關設計要求。藉由等應力直剪試驗求取潛變模型之參數，採用ABAQUS軟體進行模擬分析1000年間處置坑的潛變變形，發現在膨潤土的回脹壓力作用下，最終處置窖與阻水層被上舉15.65 mm，且產生的最大水平位移為26.70 mm。相關研究成果期能為未來之低放射性最終處置場的設計建造與安全評估提供參考。

關鍵字

低放射性廢棄物；膨潤土阻水層；潛變；數值模擬

並列摘要

Based on the preliminary design concept for the final disposal of low-level radioactive waste (LLW) in Taiwan, the creep behavior of the impervious layer made by bentonite in the disposal tunnel was investigated. Experimental study found that MX80 bentonite differs greatly in its shear strength upon saturation by groundwater intrusion, while its constant volume swelling pressure and hydraulic conductivity meet the relevant design requirements. Incorporating the creep model parameters obtained from the stress-controlled shear test, the ABAQUS software was used to simulate and analyze the creep deformation in the disposal tunnel for 1000 years. Numerical simulation showed that the disposal vault and the impervious layer moved 15.65 mm in vertical displacement and 26.70 mm in horizontal displacement due to swelling effect induced by the bentonite material. Research results may provide a reference for the future design, construction, and safety assessment of the low-level radioactive waste disposal.

並列關鍵字

low-level radioactive waste ； buffer material ； creep ； numerical simulation

參考文獻

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國際替代計量

低放射性廢棄物最終處置場膨潤土阻水層之潛變試驗與變形分析

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