| 高压实膨润土的非饱和渗透膨胀模型 |
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| 引用本文： | 牛文杰,叶为民,陈宝.高压实膨润土的非饱和渗透膨胀模型[J].岩土力学,2009,30(Z2):88-92. |
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| 作者姓名： | 牛文杰 叶为民 陈宝 |
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| 作者单位： | 牛文杰(同济大学,地下建筑与工程系,上海,200092浙江大学,水工结构及环境工程研究所,杭州,310058);叶为民,陈宝(同济大学,地下建筑与工程系,上海,200092同济大学,岩土及地下工程教育部重点实验室,上海,200092) |
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| 基金项目： | 国家自然科学基金项目 |
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| 摘 要： | 高放废弃物深地质处置库中,作为缓冲/回填材料的高压实膨润土的设计功能是,遇水吸湿导致土体膨胀变形,以密封高压实膨润土块体砌置时形成的块体与块体之间和块体与围岩之间的施工缝隙以及围岩中因处置库开挖卸载引起的裂缝,形成阻障围岩中地下水渗入内库引起核素迁移,与库内高放废物的辐射扩散的人工屏障.高压实膨润土在自由膨胀条件下的膨胀应变和非饱和渗透系数由渗透试验测得;孔隙比和吸力的关系由压汞试验测得.吸力和含水率的函数关系可由土-水特征曲线测试试验得到.因此,自由膨胀条件下膨润土的非饱和渗透膨胀模型由膨胀应变、非饱和渗透系数和孔隙比与吸力的函数关系建立.结果表明:渗透系数和体积应变都随吸力减小而增加,因为吸力减小会导致孔隙比增加.这一发现有助于设计高放废物的最终处置方案.
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| 关 键 词： | 高放废弃物深地质处置 高压实高庙子膨润土 自由膨胀条件 |
| 收稿时间： | 2009-08-17 |
Experimentally derived model for suction-induced permeability, swell and microstructure behaviour of unsaturated compacted bentonite |
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| NIU Wen-jie,YE Wei-min,CHEN Bao.Experimentally derived model for suction-induced permeability, swell and microstructure behaviour of unsaturated compacted bentonite[J].Rock and Soil Mechanics,2009,30(Z2):88-92. |
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| Authors: | NIU Wen-jie YE Wei-min CHEN Bao |
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| Institution: | 1.Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 2.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 3.Institute of Hydraulic Structure and Environment Engineering, Zhejiang University, Hangzhou 310058, China |
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| Abstract: | In the deep disposal of highly radioactive waste, the engineering barrier made by densely compacted bentonite is used to prevent the groundwater infiltrating and the radioactive waste diffusing; and the gap between the bedrock and nuclear waste canister can be filled up by the hydro swelling bentonite. The permeability and swelling behavior of bentonite are needed to be carefully studied. It is Gaomiaozi (GMZ) bentonie from China to be investigated here. A series of laboratory tests were conducted including test for determining water retention curve, permeability coefficient test in swelling condition and mercury; intrusion porosimetry (MIP) test after that. A mathematical model is established for the relationship among permeability, swelling volumetric strain, void ratio and suction of GMZ bentonite. Equations of the model indicate that the permeability coefficient and swelling volumetric strain increase with suction decrease. The reason is that the decrease of suction can cause the increase of void ratio of bentonite which will cause the increase of permeability coefficient. This discovery can facilitate the design of deep disposal of highly radioactive waste. |
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| Keywords: | deep disposal of highly radioactive waste highly compacted Gaomiaozi bentonite free swelling condition |
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