A new theory to take into account the important cut, which constitutes a deep excavation, isrnhere analyzed. Starting from the classical Mononobe–Okabe theory, considerations are drawn to rightly evaluaternthe resultant thrust as a consequence of a complex dynamic equilibrium polygon, triggered from the groundrnmotion, with also reference to the rotational aspects, summing up two different internal sub-wedges in order tornfigure out the intensity and the point of application of the actual total seismic thrust (ST). In particular the morerninternal sub-wedge (swe2), constrained by rotational equilibrium induced by the only outer wedge weight couldrnyield the outer pressure p2, while the external sub-wedge (swe1) mass is stopped as well alternatively swe1 canrnmove outward yielding the outer pressure p1, while swe2 is stopped. In the latter case swe1 keeps its point ofrnapplication, according to rational mechanics knowledge, at 2/3H, but the equivalent height h_G representing thernactual point of application of the seismic total thrust could tends to the value 2/3H*STswe1/(STswe1+STswe2),rnwhile in the former case swe2 still keeps at 1/3 H its point of application as it is in a rotational equilibrium.
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