It is the drain work that has usually been carried out under control works of landslides. On a drainage plan, the lowered amount of the ground water level is generally reckoned by the analysis for stability of the cross section of landslide.
However, the kind, the scale and the arrangement of equipments to lower the ground water level to the planned one have been decided only from experiences. To control landslides by the safety factor, then, plans for lowering the ground water level must be formed by means of the data obtained from the actual survey of the precipitation, the ground water level fluctuation, the coefficient of permeability etc.
We examined it at Toyomaki Landslide in the Mogami-gawa basin. In our plan, we used the finite element method and intended the designed safety factor to come to 1.1. On forming the model, we adopted the outcomes of our actual drilling survey and coefficient of permeability, the amount of drainage and the boundary condition obtained from the past records of constructions of two water catchment wells. The result proved the model to be reliable because it reproduced the ground water level fluctuation when the equipment had not been constructed yet, and because there was correspondence between the outcome of the simulation and the influence of two water catchment wells which had been constructed by now.
From these points of view, our conclusion is as follows.
1) It is possible to form a model of simulation in a landslide area.
2) A reproduction by the model is well worth being reliable.
3) It is possible to examine the drainage scale and place with simulation of the model.
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