Inversion Study On Soil Pressure Of Retaining Wall Based On Modal Analysis

Cantilever retaining wall, a kind of light retaining structure, has been widely usedin the supporting structures about6m such as roads, railways and so on due to itssimple structure, construction convenience and the adaptability for soft foundation.The soil pressure of retaining wall is always a big problem which has plaguedengineering industries, and designing the size of soil pressure can directly affects thequality of project and safety of people’s life and property. It is difficult to accuratelyobtain the distribution and size of soil pressure because of the complexity of physicaland mechanical properties of the rock and soil. Besides theoretical research andnumerical simulation in the traditional detection methods of earth pressure, the mostimportant method is field experiment. From the structure of retaining wall-vibrationmodality of wall under the interaction of semi-infinite geotechnical medium power,this paper is to research on the effects of the distribution and size of the soil pressureon modal parameter of retaining wall, and then detects the soil pressure according tothe change of modal parameter. The main researches of this paper are as follows:(1) Based on the consultation of extensive literature data, this paper firstlyexpounds the basic principles of the vibration modality of cantilever slab, thenanalyzes the solving methods of modal frequency and mode shapes of cantileverretaining wall and finally poses the basic ideas of soil pressure inversion through theeffects on modal parameter of cantilever retaining wall system caused by the soilbehind retaining wall.(2) This paper attempts to establish the finite element model of cantileverretaining wall by adding stiffness and quality after the comprehensive analysis on theeffects of the soil behind wall on the modal parameter of cantilever retaining wall, andalso calculates the mode shapes and modal frequency by finite element method.(3) By supposing different distribution forms of soil pressure in an engineeringsample, changing the lateral pressure coefficient of soil, and applying the calculatingmethod to the modal parameter of cantilever retaining wall, this paper establishes thetarget function compared to finite element modal parameter and experimental modalparameter, and also inverses the lateral pressure coefficient and distribution of soilconforming to the practical engineering through optimization of design.From the above research, this paper establishes the analysis theory of modal analysis on cantilever retaining wall based on Winkler elastic foundation hypothesis,builds the basic mode of inversion study on soil pressure, and provides another idea ofsoil pressure monitoring of cantilever retaining wall under non-limit state, which is ofgreat importance to the safety monitoring of cantilever retaining wall.