| 砂-砂砾换基防治渠道冻胀的研究 |
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| 引用本文： | 朱强,付思宁,武福学.砂-砂砾换基防治渠道冻胀的研究[J].冰川冻土,1988(4). |
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| 作者姓名： | 朱强 付思宁 武福学 |
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| 作者单位： | 甘肃省水利科学研究所
(朱强，付思宁)，甘肃省水利科学研究所(武福学) |
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| 摘 要： | 本文依据140组渠道工程上的实测数据,建立了残留冻胀率与换填比间的定量关系,据此得出了在地下水深埋和浅埋两种情况下,不同土质所要求的换填比。同时根据冻胀试验场220组粗粒土敏感性试验资料得出,当冻层与地下水距离大于或小于50cm时,应分别控制砂砾料内含土量不大于10％和5％。文末提出了防治砂砾料被含砂渠水污染及设立排水设施以保证换填防冻效果的两项措施。
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| 关 键 词： | 冻胀 砂砾换基 换填比 冻结敏感性 |
Subsoil Replacement Using Sand-gravel for Preventing Frost Heave Damage of Canal Lining |
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| Zhu Qiang,Fu Shining and Wu Fuxue.Subsoil Replacement Using Sand-gravel for Preventing Frost Heave Damage of Canal Lining[J].Journal of Glaciology and Geocryology,1988(4). |
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| Authors: | Zhu Qiang Fu Shining and Wu Fuxue |
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| Institution: | Gansu Provincial Reseavch Institute of Water Conservancy |
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| Abstract: | Since 1979, a field study on the subsoil replacement using sand-gravel for preventing frost heave damage of canal lining has been carried out in Gansu Province, China. The purpose of the research work is to determine the required depth and quality control criterion of the replacement material. Based on the data from 118 testing sites, the relationship between residual frost heave ratio and replacement ratio and the required replacement ratio are presented.
After a statistic analysis of 220 sets of testing data, it is ascertained that the main index for evaluating the material quality is the percentage of finer than 0.05 mm particles. The suggested limit of the fine particle content is 5% for the distance between frozen layer and water table less than 50 cm and 10% for the distance greater than 50 cm.
This paper also puts forward some measures for solving the " pollution" of sand-gravel by silty seepage flow and suggests some drainage types for the sand-gravel replacement. |
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| Keywords: | frost heave subsoil replacement replacement ratio frost susceptibility |
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