Study on Passive Earth Pressure of Finite Soil in Foundation Pits
Through data analysis,the influence of limited soil on the displacement and bending moment of the foun-dation pit support structure was quantitatively studied.Based on the limit equilibrium theory,the calculation expres-sion for the passive soil pressure of the limited soil in the pit was derived.The changes of the passive soil pressure of the limited soil in the pit were analyzed with changes in soil cohesion,internal friction angle,external friction angle between support and soil and the slope foot of the limited soil.The research results indicate that the limited soil in the pit can't only be solely used as a safety reserve in practical engineering,but its beneficial effects should be fully considered;The passive soil pressure will increase with the increase of cohesion,internal friction angle,external friction angle,and slope foot.While the rupture angle of the soil will decrease with the increase of internal friction angle,external friction angle,and slope foot;When the cohesion value is the same,with the ratio increase of the width to height of the limited soil gradually increases,the fracture angle also gradually increases;When the ratio of width to height ratio of the limited soil is the same,the greater the cohesive force,the greater the corresponding fracture angle;When the ratio of the width to height of the limited soil is greater than 1.0,with the ratio increases,the smaller the cohesion value,and the larger the fracture angle increases;When the ratio of the width to height of the limited soil is greater than 1.2,the limited soil in the pit can be considered as infinite soil and be solved by the classical soil pressure theory.
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