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Abstract The dispersibility and seepage stability of soil samples obtained from the clay core wall of Banduo earth-rock fill dam in Qinghai Province are studied by the chemical properties of soil analysis and the tests for identification of dispersive clay soils. The tests include double-hydrometer test，pinhole test，crumb test，the test to determine salt contents of pore water and percentage of exchangeable sodium，and seepage distortion tests. The experimental results are shown that the clay mineral is main granite with little montmorillonoid，but a great quantity of sodium-ion and higher pH value in granite soils making the soil intensively be dispersed. At the same time，the dispersive soils have largely filtration properties，so the soils in split are not easily washed away. The achieved results show that dispersive soil can be served as the clay core wall in earth dam under filter layers.
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Received: 31 May 2007
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