Analysis Of Effect Of Strut Parameters On Movement Of Diaphragm Wall And Ground Settlement Behind The Wall

Taking extended modified cam-clay as soil model and employing contact and friction as interaction between soil and diaphragm wall, the movement of diaphragm wall, the ground settlement behind the diaphragm and the upheaval on the bottom of foundation of sequential excavation and strut installation under two cases of loads was simulated by using general FEM program ABAQUS. The affection of building load will increase by fifty percents of the maximum movement of diaphragm wall, two hundred percents of the maximum ground settlement and forty percents of the maximum axial strut force according to the results of computation and practice surveying. So 2-D Plain FEM Method can well simulate the cases of foundation excavation and obtain reasonable results in the case of rational model and parameters.Based on the model above-mentioned, studies show that the movement of diaphragm wall and the ground settlement behind the diaphragm are sensitive to the pre-load of first strut and not sensitive to the stiffness of the strut according to different combination of pre-load and stiffness of the strut. We can also conclude that the movement of diaphragm wall and the ground settlement behind the diaphragm are sensitive to the pre-load and the stiffness of 2nd, 3rd and 4th struts when the stiffness is too low according to different combination of pre-load and stiffness of the struts, but not sensitive to the stiffness of the struts when the stiffness is very high.