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莫永杰¹  ,  徐嘯川²

 

( 1 .  中國有色桂林礦產地質研究院有限公司 ，廣西 桂林 541004 ;

2.  中國地質大學（武漢） 工程學院 ，湖北 武漢 430074)

摘   要 ：堤壩水位的快速降低可能會導致堤壩滲流發生變化，這是由于堤身內部高孔隙水壓力，從而影響堤壩的穩定性?？紫端畨毫Φ南⒃诤艽蟪潭壬鲜苤谭绞降挠绊?。通過大型室內模型試驗，研究吹填 、碾壓筑堤在水位速降下的孔隙水壓力變化 、水土總壓力變化以及坡面位移演化規律。結果表明：水位速降條件下吹填筑堤穩定性優于碾壓筑堤；在水位上升階段，孔隙水壓力平衡后碾壓筑堤的孔隙水壓力高于吹填筑堤；水位  速降時吹填筑堤的孔隙水壓力消散速度比碾壓筑堤慢，并且孔隙水壓力的變化在水土總壓力變化中占主導地位； 滲流邊界的變化，導致壩體內外形成壓力差，是導致壩體發生失穩的主要因素；孔隙水壓消散速度是導致吹填筑堤與碾壓筑堤變形不同的主要原因。研究成果可為水位速降下堤壩治理提供一定參考。

關鍵詞：水位速降 ；堤壩工程 ；模型試驗 ；孔隙水壓力 ；穩定性

中圖分類號：TV871            

文獻標志碼：A           

文章編號： 1005- 8249   (2024)  06- 0048- 07 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.06.009

 

MO Yongjie¹  ,  XU Xiaochuan²

(1 . China Nonferrous Metals  (Guilin)  Geology and Mining Co. ，Ltd. ，Guilin 541004 ,  China;

2. Faculty of Engineering ,  China University of Geosciences  (Wuhan) ,  Wuhan 430074 ,  China)

Abstract: The rapid lowering of dam water levels may lead to changes in seepage within the dam due to high pore water pressure inside the dam body, thereby affecting the stability of the dam. The dissipation of pore water pressure is largely influenced by the dam construction method. Through large-scale indoor model tests, this study investigates the changes in pore water pressure, total earth pressure, and slope displacement evolution under rapid water level drawdown for hydraulic fill and compacted fill dams. The results show that under rapid water level drawdown, the stability of hydraulic fill dams is better than that of compacted fill dams. During the water level rise stage, after pore water pressure equilibrium, the pore water pressure in compacted fill dams is higher than in hydraulic fill dams. During rapid water level drawdown, the dissipation of pore water pressure in hydraulic fill dams is slower than in compacted fill dams, and changes in pore water pressure dominate the changes in total earth pressure. The pressure difference formed between the inside and outside of the dam due to changes in the seepage boundary is the main factor leading to dam instability. The dissipation rate of pore water pressure is the key reason for the difference in deformation between hydraulic fill and compacted fill dams. The findings provide a reference for dam management under rapid water level drawdown conditions.

Keywords :  rapid drawdown of water level;  dam project;  model test;  pore water pressure;  stability

 

*基金項目： 國家自然科學基金項目  (51779155) 。

作者簡介：莫永杰  (1986—) ,  男，本科，工程師，研究方向：巖土工程。

通信作者：徐嘯川  (1988—)  男 ，博士，講師，研究方向：地質災害防治研究。 

收稿日期：2023- 07- 12