How To Make A Model Uterus

PUSHING THE EARTH

PUSHING THE EARTH

Any material stored silage or exercise against a wall, vertically or inclined, which prevents slips, a push, whose intensity depends on the physical and mechanical properties of the material.
theories for calculating the thrust of the lands, this depends mainly on the bulk density of soil and its friction angle fi, which defines the state of limit equilibrium and identifies, in the absence of cohesion, the level of natural slope, ie that plan under which the mass of earthy, free-falling, of course you have, all the plans that form the horizontal angles alpha> fi represent possible slip planes of the overlying land mass, to be supported by specific works, designed and dimensioned according to the pressure exerted by the mass. First hypothesis

The soil is considered homogeneous in all its parts, that is, you admit his constant physical and mechanical properties. Second hypothesis

If a wall is built of earth fill inconsistent throughout its height, upper bounded by a horizontal or inclined, and unlimited by the other parties, the mass of land immediately causes a push against the wall that undergoes S a slight subsidence, ie a translation or a rotation around the point D.

Before studying the methods of calculation of the thrust of the embankments, some observations are appropriate:
- i valori delle spinte attiva e passiva, essendo definiti in funzione della condizione di equilibrio del muro, consentono a quest'ultimo un lieve spostamento e pertanto possono verificarsi spinte di terrapieni maggiori di Sa, nella seconda ipotesi e minori di Sp nella terza ipotesi;
- nel calcolo della spinta attiva, con un errore praticamente trascurabile e a vantaggio di una maggiore semplicità nel calcolo stesso, la superficie di scorrimento può essere considerata piana anziché curva; tale approssimazione non è possibile nel calcolo della spinta passiva
- nel caso di terreni coerenti e argillosi, eventuali sovraccarichi gravanti sul terrapieno determinano una compressione della massa terrosa con una riduzione dei pori, per which part of 'water content is to accumulate along the sliding surface facilitating the posting of the prism slip and therefore reduces the' angle of friction with the 'increase of the overload;
- the value of the active thrust is calculated under the real one that must withstand up to the wall that the wall has not suffered a mild failure (translation and / or rotation), so it is preferable to a less rigid wall, and therefore more prone to failure, compared to another with high stiffness in As oversized;
- the prism of land that is separated along the sliding surface tends to wedge
to the limited impact it has on the value of the force, in general, this friction is trascurato, anche perché si riduce per la presenza di umidità; quando si vuole considerarlo, se ne tiene conto tramite il relativo angolo di attrito (P, la cui ampiezza può assumere valori: fi = ( 1/2 // 2/3)x fi --> fi1 maggiore o uguale 1/2fi