Interaction of a protecting wall with a soil massif in process extractions of foundation pit

Abstract

The computing procedure to determine the soil pressure on retaining structure and it’s displacements during earth excavation from a pit is developed. At the first stage the protecting construction (slurry wall, sheet piling, row of piles) is enclosed in a ground from the both sides, then the earth excavation from one side of the screen begins. The variations of soil pressure on the both sides of protecting screen are traced in the process of computing with proposed method. The critical depth of a pit at the moment of failure is determined. The retaining structure in the calculating scheme is simulated as an elastic beam construction. The soil is presented as a nonlinear model, in which the modulus of rigidity decreases when the soil stress is nearing to the ultimate limit value. The mathematical procedure consists of iteration of sequential separate calculations by Gauss’s method.

Keywords

• механика
• механика грунтов
• основание
• фундамент
• подпорная стена
• шпунт