The contemporary conventional theory of earth pressure is based on the very old simple idea of a single shear or slip soil mass surface defining earth pressure stress along the whole height of the retaining structure. More over, the conventional theory neglects any influence of the mass shear strength decrease on earth pressure due to the over-mobilization, when the strength decreases to its residual value and, also does not consider any other value of pressure at rest except of the value of active pressure at rest. After a number of wide analyses the Paper designs a non-conventional conception of the lateral pressure theory on the advanced comprehensive non-linear dependence based. This theory takes into account both the singularity of pressure at rest and the shear strength decrease from the peak value to the residual one.


The actual theory of the earth pressure (in mechanics more widely as "lateral pressure") is based particularly on the works of Ohde, Terzaghi, Caquot-Kerisel, Ehrenberg, Jáky, de Wett, Sowada, Siedek, Myslivec, Pruška, Janbu, Brooker-Ireland, Morgenstern, Eisenstein, Gudehus {1980} and others for static problems, while Tanaka, Finagenov, Alampalli, Lemos, Byrne, Crespellani, Simic and others should be mentioned in connection with dynamic problems. This was confirmed by the results of the last special IS Tokyo 1999 "Geotechnical Aspects of Underground Construction in Soft Ground" {Ariizumi et al., Day, Kort et al., Onishi&Sugawara, Powderham, Siemer et al., Uchiyama and others}. The reason is probably the complex nonlinear dependence of the lateral pressure on the movement of structure neary the rest area with a history similar to the singularity (Koudelka 1990). The recently published model solves the computation of active and passive lateral pressure on curved (circular) shear surfaces by an original Apriori Integration Method {AIM} {Koudelka 1997, Koudelka&Fischer 1999}.

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