具裂縫的緩衝材料自癒行為模擬;Simulation of Self-Healing Behavior in Cracked Buffer Material

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题名:	具裂縫的緩衝材料自癒行為模擬;Simulation of Self-Healing Behavior in Cracked Buffer Material
作者:	古明正;Gu, Ming-Zheng
贡献者:	土木工程學系
关键词:	廢棄物罐;緩衝材料;自癒行為;Canister;Buffer;Self-Healing Behavior
日期:	2024-08-23
上传时间:	2024-10-09 14:53:08 (UTC+8)
出版者:	國立中央大學
摘要:	本研究規劃動態離心模型試驗模擬緩衝材料受震引致破裂行為，以及1 g物理模型試驗模擬有裂縫之緩衝材料受地下水浸潤時自癒行為。在動態離心模型試驗中，透過地工離心機提供10 g的穩定離心加速度場，以模擬現地處置孔中緩衝材料的土壓力條件。在離心模型試驗過程中輸入不同振幅及頻率的基盤震動，紀錄廢棄物罐頂部與底部的加速度反應，並在試驗結束後觀察並記錄緩衝材料塊受震後破裂的裂縫分佈情形。在小模型試驗中將人工製造裂縫，模擬處置孔內受到深層地下水浸潤，觀察帶有裂縫的緩衝材料之自癒行為。離心模型試驗結果顯示無地下水入侵之試驗在振動事件頻率為3 Hz時廢棄物罐有較大的反應，且裂縫分佈多為垂直向裂縫；有地下水入侵之試驗在各振動事件中廢棄物罐皆和系統受震反應一致，裂縫部分則同時有垂直向及水平向。在1g裂縫癒合試驗中，共有20組試驗其中5組為裂縫寬度0.45 mm，裂縫深度分佈為4 mm至 12 mm，模擬處置坑內之水流路徑，在試驗完成後發現其只有表面癒合，內部還存在一裂縫無法閉合；15組為裂縫寬度0.45 mm、0.80 mm及1.45 mm，裂縫深度分佈為4 mm至12 mm，因在現地處置時間約為十萬年，故試驗結果顯示裂縫癒合時間與裂縫深度以較大時間尺度下相差無幾，但裂縫癒合時間與裂縫寬度呈現正相關，其癒合時間隨裂縫寬度之上升趨勢為指數型增加，並且在裂縫寬度較大、裂縫深度較小時較容易發生裂縫癒合不完全之情形。 ;This study plans dynamic centrifuge model tests to simulate the crack behavior of buffer materials induced by input motion and 1g-scale physical model tests to simulate the self-healing behavior of cracked buffer materials under groundwater infiltration. In the dynamic centrifuge model tests, centrifuge provides a stable centrifugal acceleration of 10 g to replicate the stress conditions of buffer materials in the disposal hole. Different amplitudes and frequencies of input motions are applied during the centrifuge model tests, monitoring the acceleration responses at the top and bottom of the canister and observing and recording the crack distribution of the buffer material blocks post-seismic excitation. In the 1g physical model tests, artificial cracks are created to simulate deep groundwater infiltration into the disposal hole, observing the self-healing behavior of buffer material with cracks. In the centrifuge model tests, results indicate that under a input motion frequency of 3 Hz, the canister exhibits greater responses in the absence of groundwater infiltration, with predominantly vertical crack distributions. In tests with groundwater infiltration, the canister′s responses align with the system′s seismic response, with both vertical and horizontal crack distributions. In the 1g crack healing tests, a total of 20 tests are conducted. Five groups have a crack width of 0.45 mm and crack depths ranging from 4 mm to 12 mm, simulating the water flow path within the disposal pit. Post-test observations reveal only surface healing, with internal cracks remaining unclosed. The remaining 15 groups have crack widths of 0.45 mm, 0.80 mm, and 1.45 mm and crack depths ranging from 4 mm to 12 mm. Results suggest that while crack healing time shows minimal variation with crack depth on a large time scale, there is a positive correlation between crack healing time and crack width, with healing time exponentially increasing with crack width. Moreover, incomplete crack healing is more likely to occur with larger crack widths and smaller crack depths.
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