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Abstract Based on the established similarity law and tests of filled up slope failure model and soil-nailed supporting mechanism，test study on the stress and deformation behaviors of soil-nails in continuous and intensive precipitation was conducted. The achieved results are listed as follows：(1) it is one of necessary working processes to construct the closing concrete layer and the advanced vertical anchor pipe for supporting backfilled sidewall or slope with composite soil-nailed technique；(2) after being permeated with precipitation，the backfilled soil grains have the tendency to obtain the minimum potential energy，which means the soil has liquidity tendency and the rigid motion assumption is not suitable for analyzing the stability of backfilled sidewall or slope；and (3) the critical point of penetration speed increment is the key factor to control landslide. It is found that the critical point of the precipitation speed increment is 15.5 cm/d；and sedimentation and landslide will happen when the precipitation speed increment reaches or exceeds the critical point.
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Received: 12 July 2006
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