A Study on the Earth Pressure Distribution around the Trap Door

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(1) The earth pressure distribution around the trap door can be numerically simulated for both of sandy and clayy grounds.(2) In particular, the earth pressure in the case of clayy ground is obtained with a high accuracy.(3) It is clarified that the effect of the dilatancy is important and that the selection of thye flow rule should be made carefully.(4) An experiment as well as the numerical simulation was performed for the composite ground of clay and sand but any clear effect of the double layr ground was not observed due to the high stiffness of clay.(5) From the result of the numerical simulation, it was found that almost no loothed earth pressure was observed when the soft clay layr is deposited under the sand layr.(6) The Terzaghi's formula can not predict clearly the earth pressure for the composite layr.