| The study of frost-heave mechanism and seepage technical control on U canal |
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| DOI：10.7606/j.issn.1000-7601.2006.03.42 |
| Key Words: the lining of U Canal mechanism of frost theory of seepage control |
| Author Name | Affiliation | | LI Xue-jun | Institute of Water Resources Xi’an University of Technology,Xi’an,Shaanxi 710048,China；Xi’an Chan—Ba He Management Commission Ecological Bureau,Xi’an,Shaanxi 710032,China | | FEI Liang-jun | Institute of Water Resources Xi’an University of Technology,Xi’an,Shaanxi 710048,China | | MU Hong-wen | Institute of Water Resources Xi’an University of Technology,Xi’an,Shaanxi 710048,China |
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| Abstract: |
| Mechanism of frost of U canal is studied through shell structure theory and it is found that under the frost-heave force,the lining of U canal will be lifted overall,unlike ladder-shaped canals,which will crack in the middle of canal bottom and along the line locating in 1/3 the length of the slope of two side to the bottom line.The main reason of canal destroyed are soil moistures, meteorological phenomena,canal move towards and strength state on canal,all of these which evenly cause frost heave to canal.The parameter of optimized section of U canal is determined according to water dynamics conditions for sections.All these are analyzed,which include three sections of canals in the north and south china irrigated areas,different lining materials,structure forms,filling materials which are used in the designing and building large or medium sized U canals and it is suggested that U canals have good seepage control in frost free areas,and in areas of heaving bottom,where the value of frost heave does not exceed 5 cm,U canal is a feasible and excellent solution for seepage control provided that proper anti-frost measures are implemented.Some problems about the lining of U Canal to be solved are discussed. |
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