膨润土粉密封条件下缓冲砌块接缝的膨胀应力发展研究
Stress development in compacted block joints backfilled with bentonite powder in HLW barrier
查看参考文献16篇
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文摘
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通过室内模拟试验,采用膨润土粉对模拟砌块接缝区进行填充,监测砌块接缝区膨胀应力的发展过程,并借助微观结构分析,探讨砌块接缝膨胀愈合的基本机制。膨胀力试验结果表明:含接缝膨润土砌块的膨胀力发展呈现典型的空间各向异性,接缝区膨胀应力增长速率高于砌块轴向膨胀应力增长速率,顶部膨胀应力受水分迁移以及侧壁摩擦力影响,增长速率滞后于底部区域。随着水化进程的持续,接缝在砌块径向和轴向膨胀应力的双重箍束作用下被挤压密实,砌块区最终干密度下降,接缝区干密度增加。微观结构分析表明:土体集合体内孔隙数目从砌块中心区域至接缝区域逐渐减少,而大孔以及连通孔隙数目逐渐增多,土体结构由紧实状态逐渐过渡到疏松状态,形成一定宽度范围的过渡带。 |
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其他语种文摘
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In this study,an indoor simulation test is conducted to monitor the swelling process of joint area which is backfilled with bentonite powder. The basic mechanism of swell-sealing of joint between blocks is investigated with microstructure analysis. According to the swelling test,the swelling stress development in the joints of blocks is anisotropic. The growth rate of swelling stress at joint area is higher than that of axial direction. The swelling stress at top surface,which is far away from the wetting surface,lags behind that at the bottom surface due to the water migration and sidewall friction. With the increasing of saturation degree,the joint areas are squeezed and compacted under the radial and axial swelling stresses of blocks. The final dry density of blocks decrease and of joint area increases. According to the microstructure analysis,the number of micropores in the soil aggregates decreases and the number of macropores and connected pores increase gradually from the block center to the joint area. A certain width of transition zone is formed between blocks and joint areas. |
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来源
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岩石力学与工程学报
,2018,37(9):2200-2208 【核心库】
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DOI
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10.13722/j.cnki.jrme.2018.0006
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关键词
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土力学
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高放废物处置
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膨润土
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接缝
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膨胀力
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微观结构
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地址
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1.
兰州大学土木工程与力学学院, 甘肃, 兰州, 730000
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兰州理工大学土木工程学院, 甘肃, 兰州, 730050
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-6915 |
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学科
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建筑科学 |
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基金
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国家自然科学基金
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兰州大学基本科研业务费专项资金
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文献收藏号
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CSCD:6322889
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