| 车雯方,樊恒辉,张路,宋婉婷,何武全,娄宗科.蛤蟆通和引汤灌区渠基膨胀土的渗透变形和裂缝冲刷试验[J].中国水利水电科学研究院学报,2018,16(6):578-585 |
| 蛤蟆通和引汤灌区渠基膨胀土的渗透变形和裂缝冲刷试验 |
| The permeability deformation and the crack erosion test of canal foundation with expansive soil in the Hamatong and the Yintang irrigation area |
| 投稿时间：2017-09-27 |
| DOI：10.13244/j.cnki.jiwhr.2018.06.009 |
| 中文关键词: 渠道工程 膨胀土 渗透变形 裂缝冲刷 裂缝演变 |
| 英文关键词:channel engineering expansive soil permeability deformation crack washout crack evolution |
| 基金项目:国家自然科学基金项目（51379177，51579215） |
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| 中文摘要: |
| 以黑龙江省蛤蟆通灌区和引汤灌区渠基的弱膨胀性土为研究对象，采用渗透变形试验和裂缝冲刷试验，对渠基的抗渗特性和裂缝冲刷特性进行研究。试验结果表明，蛤蟆通渠基土和引汤渠基土的渗透性极低，在渗透变形试验中均表现为流土型破坏，具有较强的抗渗透变形能力。膨胀土渠基裂缝在水流的作用下有自愈、缩小、增大和整体流失等4种演变形式，其与土体的含水率、裂缝的开度及裂缝形态等因素有关。含水率越低，裂缝开度越小，裂缝越趋向自愈；反之，裂缝具有扩大甚至产生土体整体流失破坏的趋势。横向裂缝在中部易出现贯穿性孔洞，竖向裂缝的开度则在水流冲蚀部位变大。 |
| 英文摘要: |
| Taking the weak expansive soil of the canal foundation in Hamatong and Yintang irrigation area of Heilongjiang Province as the research objects, the impermeability performance and crack erosion characteristics of the canal foundation were studied by using the permeability deformation test and crack washout test. The test results showed that the permeability of the Hamatong canal foundation soil and the Yintang canal foundation soil was extremely low. All of tests showed that the types of permeability deformation destruction of two kinds were soil flow,and the two kinds of soil had strong resistance to permeability deformation. The crack in the canal foundation with expansive soil had four kinds of evolution patterns,such as self-healing, shrinking, increasing and total erosion, which were related to the water content of the soil, width and morphology of crack. The lower the water content of soil and the smaller the crack width. The more the cracks tended to self-healing. On the contrary,the width of crack had the tendency of expanding or even losing the entire body. If the crack was transverse, the holes tended to appear in the middle. If the crack was vertical,the width of crack with the water erosion part becomed larger. |
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