Model Test Research on Seepage Stability of Dredging Fill and Rolling Embankment under The Condition of Rapid Water Level Drop
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.
rapid drawdown of water leveldam projectmodel testpore water pressurestability
万方数据
维普
