The Study On Mechanism Of Strengthening Expansive Soil With Bag And Numerical Simulation

The text combined with changjin’s highway as the back ground project, in a variety of effective data was obtained through the numerical simulation of expansive soil slope stability by FLAC3D, The date proved that the method of soilbags technolo-gy is effective, we summarized the main research work as below:1、The text summarized the expansive soil slope and expansive soil in the research results of the related fields,mainly including expansive soil strength, defor-mation, Seepage research, The analytical method of slop stability of Expansive soil and the method of expansive soil slop reinforcement.2、Soilbags simplified into a rectangle, cuboids has six contact surface, FLAC3D software simulated single soilbag of strength and multiple soilbags of strength, the da-te was obtained that soilbags’s strength and the expansive soil of strength, the soilbag-s’s strength was linearly related to the strength of expansive soil, The test results tha-t simulated by FLAC3D accorded with the result of the calculation. multiple soilbags of strength smaller than single soilbag of of strength, multiple soilbags of strength rela-ted to soilbags reinforcement width and soilbags reinforcement height.3、The effect that considering the contact between soilbags and soilbags was better than the effect that not considering the contact between soilbags and soilbags, when the soilbags width is a certain width, It is shown that the maximum horizontal displacement decreased and safety factor increased, the expansive soil slope can be stabilized, If reinforced width was increased, the safety factor is increased but not obviously and the maximum horizontal displacement is decreased but not obviously.4、Different slope of expansive soil that analyzed by FLAC3D,The more steep of expansive soil slope, the more stable of expansive soil slope by soil bag technology under a certain conditions.The superiority of soilbags was obvious.