Stability Analysis Of The Slope Paved With Geo-textile Containers Considering Seepage Effect Based On ABAQUS

Slope stability analysis is the main research topic of geotechnical engineering,and it is also the core content of slope design and treatment.In the factors affecting the stability of soil slope,the seepage effect of water should not be neglected.In fact,the seepage field and the stress field interact and interact with each other,and are in a complex dynamic process,forming a fluid solid coupling relationship.Therefore,the study of coupling between seepage field and stress field has theoretical and practical significance for slope stability.In the light of the serious local collapse of the slope in the seepage process of the groundwater drainage channel in the Yellow River irrigation area of Ningxia,this thesis explores the calculation of the stability of the slope under the seepage action.Using the finite element strength reduction method and the ABAQUS finite element software,the numerical simulation analysis and calculation are carried out by using the finite element strength reduction method and the ABAQUS finite element software.The main research results are as follows:(1)the basic theory of seepage and the principle of fluid solid coupling are expounded in detail.The derivation process of the finite element equation for seepage is introduced,and the conditions for the solution of the seepage equation are summarized.Based on the mechanism of fluid solid coupling,a fluid solid coupling model is established,and the process of solving the model is given.(2)using the finite element software ABAQUS to establish the finite element calculation model of the stability of the geotextile sack side slope considering the seepage effect.The simulation results show that the groundwater seepage in the drainage ditch of the farmland has a obvious influence on the slope stability,and gives the seepage field,stress field and edge of the ditch slope under the fluid solid coupling and the non fluid solid coupling condition.The slope stability coefficient,considering the slope stability coefficient of the fluid solid coupling,is larger than that of the non fluid solid coupling calculation method.On this basis,the influence of cohesion,friction angle,water head and permeability coefficient on the slope stability is analyzed.(3)the calculated values of the slope stability analysis under the actual conditions are compared with the numerical simulation values under the same working conditions.The theoretical values are larger than the numerical values,and the in-situ monitoring data of the two types of working conditions are compared with the numerical simulation under the same conditions.The displacement value and pore water pressure value agree well with the in-situ measured values.In view of the actual situation that the drainage ditch of the farmland mainly takes the discharge of groundwater and reduces the ground water level of the farmland,the finite element strength reduction method is studied for the calculation of the stability safety factor of the slope of the drainage ditch with the consideration of the seepage effect,in order to provide the theoretical basis for the design and construction of the treatment process of the drainage ditch in the farmland.