CONSIDERATION ON PREDICTION METHOD FOR OCCURING TIME OF SLOPE FAILURE DURING SEEPAGE OF RAINFALL

In order to develop a prediction method for the occuring time of a slope failure due to rainfall, the experiments and analyses were carried out. The pore pressures increased sharply from about ten minutes before the failure, while almost no displacement of the slope surface and no strain in the slope was measured. Then the prediction method based on the measurement of pore pressure in a slope during a seepage of rainfall seems to be probable. The seepage characteristic and the thickness of permeable layer have a great influence on the total rainfall till the slope failure. The quantity of successive rainfall for the slope failure can be accurately estimated by numerical analysis if the pore pressure distribution in the slope is known.