Abstract：Research purposes: The drainage-failure of the existing retaining structures is a common disease. In order to uncover the relationship between earth pressure and pore water pressure，and to reveal the damage mechanism of existing retaining structures caused by drainage system′s failure，a series of model experiments were done in the laboratory to research on the variation of earth pressure and pore water pressure under three kinds of drainage condition with two different diameters soil samples(sand and clay)，the value of earth pressure and pore water pressure before and after the water draining was also analyzed to identify this kind of change.
Research conclusions:(1)The test result shows that the earth pressure moved up sharply when soil was submerged in water, if the water in soil is not drained in time，and the maximum value of earth pressure could increase up to 145 % compared with the original value in the test. The failure of the wall drainage system will increase the stress of retaining structure significantly, and may result in the moving out or overturning of the structures.(2)Under the normal circumstances，the pore water pressure will dissipates rapidly. However, if the drainage system fails to work，the water discharge time will cast longer. (3)Therefore，the existing retaining structures should pay attention to drainage- failure in engineering application.(4)The research results may be a guidance for designs and managements of retaining structures.
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2013, Vol. 30 
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