Limited Soil Earth Pressure Theory And Its Application In Engineering

The role of earth pressure on retaining wall commonly used classical earth pressure theory to calculate. Classical Rankine earth pressure theory and Coulomb earth pressure theory is derived under conditions of semi-infinite soil. With the continuous development of urban construction. Floor space can not meet the needs of construction, Which led to the construction that it is continuous development of underground space. Many support engineering often appear that the width of the soil behind the wall is limited. Previous studies that the limited soil shape is the rule in this case. Now more practical projects are construction,Due to the complexity of the terrain, Diversify of retaining wall backfill, lead to the soil behind the wall that The shape of the soil behind the wall is non-square shape. After retaining wall backfill in the case of is not satisfied semi-infinite soil and regular shape soil. Based on the limit equilibrium method, which a new study of earth pressure calculation method.Derived formula that it is Limited soil active earth pressure and Limited soil passive earth pressure under grading conditions.In this paper, the main work and achievements include the following aspects:(1) Analysis of the soil that It does not change the ratio of the width limited soil and the pit depth(b/H), changing the size of the pit based on this formula. It is no effect of shear plane angle of rupture and limited soil active earth pressure and passive earth pressure limited soil is proportional to the square of pit depth.(2) With the slope angle change, the value of b / H increases, the shear fracture angle and limited soil active earth pressure will tend to a certain value, And the scope of formula that it is regardless of the angle slope and it was negatively correlated of the friction(3) based on the MATLAB computational analysis, When the slope angle changed, angle of internal friction unchanged, When the limited soil width less than 0.85 times the depth of excavation, Shear fracture plane line of limited soil that it is post on the slope, Theory of limited soil calculate the limited soil active earth pressure is available, When the limited soil width more than 0.85 times the depth of excavation, hear fracture plane line of limited soil that it is Post on top of the hill, It can be calculated active earth pressure in accordance with the theory of Coulomb, and with the slope angle increased, which it should not change the failure mode.(4) based on the MATLAB computational analysis, When the slope angle changed, angle of internal friction unchanged, When the limited soil width less than 0.46 times the depth of excavation, Shear fracture plane line of limited soil that it is post on the slope, Theory of limited soil calculate the limited soil passive earth pressure is available, When the limited soilwidth more than 0.46 times the depth of excavation, hear fracture plane line of limited soil that it is Post on top of the hill, It can be calculated passive earth pressure in accordance with the theory of Coulomb, and with the slope angle increased, which it should not change the failure mode.