The Static Analysis Of The Diaphrag Wall And The Discussion Of The M Method

On the basis of the experiment, considering the characteristics of interaction between the diaphragm wall and soil, general finite element software Ansys is used to set up three kind of numeral models which based on the theory of ultimate balance, the theory of the elastic compressive resistance and the theory of finite element which considered the elastoplasticity of the soil. And they were calculated with numerical analysis. The model wall with changeless rigidity and varying rigidity were calculated by the method of equal value beam, the method of m and the method of contact surface in the Ansys software. Compared with the results of the model test, the calculated values of displacements and moments are accurate enough. It is proved that the numerical analysis is feasible. The moments and displacements of the model wall with hinged ends are studied specially. I found that the hinged ends and the varying rigidity can affect the values of moments and displacement very much. The values of transverse moments are almost equal with longitudinal moments. Many engineer often ignored the transverse moments and the reinforcement is designed as constructional reinforcement. Obviously, it isn't right.What's more, this paper has discussed the m method. In practice, many people look for the m value in the m table which has been specified by the codes. But the range of the values of m is so large that it leads to more error. For the reason of this, this paper provide a new method to find out more accurate m value. By the way of modifying the function between the test results of m value and the displacement of model wall, put the m value into the Ansys procedure and calculated iteratively, then it would find the most accurate m value.