Mechanical And Deformation Characteristic Analysis Of Circular Diaphragm Wall

As a special form of supporting, the circular diaphragm wall has great advantagessuch as good impermeability, high rigidity and integrity. It has been widely appliedbecause its arch effect can transform most of the external load into circular internal force,consequently make full use of the concrete compression thus reduce the cost. However,due to the arch effect, stress and deformation stress behavior becomes more complex. Inview of this, study of this particular form has a very important significance.Based on a main steel-making workshop swirl pool in Shougang Jingtang United Iron&Steel Limited Liability Company, deformation and stress behavior of circulardiaphragm wall have been analyzed through comprehensive utilization of three technicalmeans including theoretical arithmetic, field monitoring and numerical simulation, themain contents are as follows:Firstly, based on the cylindrical shell theory with moment, considering the particularforces form and boundary conditions of circular diaphragm wall, formulas for internalstress and deformation are deduced. Secondly, through the processing of experimental data,stress and deformation behaviors of circular diaphragm wall have been gained. Along thedepth of the wall, both of stress and deformation increase first and then decrease. Duringexcavation the point of maximum displacement gradually decreases and is finally stablenear the excavation face. The arch effect restrictes the radial displacement obviously,while can cause larger circumferential stress. Thirdly, after certain simplification to theactual situation, the three-dimensional model is established based on FLAC3D to simulatethe excavation, and its results are in accordance with measured trends basically. Afterthat，the impacts of wall thickness, wall elastic modulus and soil elastic modulus to stressand deformation are separately analyzed. Lastly, the measured results, numerical analysisresults and analytic solutions are compared and the causes of error are analyzed.The laws on stress and deformation of circular diaphragm wall are analyzed, whichcan provide theoretical guidance and technical support for engineering design.