Study On Numerical Simulation Of Inland River Waterway Slope Stability Based On ABAQUS

Bank slope instability universally exists in rivers, it leads to the damage of buildings along the river and property loss; at the same time, it leads to land erotion of the bank, threatens navigation conditions and increases the channel maintenance cost. Consequently, the research on the river bank slope stability is very meaningful.There are many factors which affect bank slope stability, but in this thesis seepage, rainfall and shipwave are mainly considered. The numerical models are set up based on local data according to the request of Guangxi Autonomous Region Youjiang upstream Naji reservoir bank slope regulation project through large general FEM analysis software ABAQUS, and FEM strength reduction method is applied to analyse the effects of different factors on slpoe stability.The main contents of this thesis are abstracted as follows:1. The ABAQUS fluid-solid coupling analysis principle, the strength reduction method and Mohr-Coulomb model are described, and the selection of modle parameters is introduced.2. The effects of single factors on slope are studied. Single factors include water level, seepage, rainfall and ship wave. Numerical modles are set up in ABAQUS, and safety coefficients are calculated through strength reduction method. According to the calculation results which show the distributions of pore pressure, saturation, plastic zone, displacement and velocity and the change of stress, the reasons why each factor leads to slope steability are analysed. The safety coefficients under the same factor but different conditions are compared, and their trends are summeried. When it comes to the analyse of the effects of water level and seepage on slope steability, Morgenstern-Price method is also adopted, and the results of the two methods are compared to verify the reliability FEM strength reduction.3. The effects of combinatorial factors on slope are studied. Two or all of the three factors are combined,and several conditions are selected for each combination to calculate. According to the calculation results which show the distributions of pore pressure, saturation, plastic zone, displacement and velocity and the change of stress, the reasons why each combination leads to slope steability are analysed. The safety coefficients under different combinations are compared, and their trends are summeried. Besides, how each factor affects each other is also analysed.The results show that the safety coefficient decreases as the water level falls, head difference of steady seepage rises, rainfall intensity increases, soil strength weakening generated by ship wave gets worse. Rainfall mainly leads to the insteability of slope surface and has less effect on global stability of clay slope. Ship wave itself has little effct on slope stability, but the soil strength weakening by its circulation function has a strong influence. When the three factors combined together, the effect of each factor is different.