| The stability of slope is one of the three most classical problems in the field of geotechnical engineering.In the process of slope stability analysis,because of the traditional limit equilibrium method can not accurately a comprehensive consideration of various load of soil and description and the changing rule of the slope stability under load,so use computer technology to the nonlinear finite element strength reduction finite element method(fem)was adopted to the analysis of slope stability,which can better response in the process of calculating the slope rock mass constitutive model and the yield criterion,led to its becoming a main method of the stability of slope.Most landslide accidents caused by slope instability are caused by the change of slope rock and soil properties caused by groundwater seepage,so it is necessary to study the slope stability under the action of groundwater seepage.On the basis of summarizing the previous existing research results,this paper uses ANSYS software to analyze the stability of the slope,mainly from the following four aspects in the process of slope stability analysis related research and discussion:(1)Different definitions of slope safety factor have different physical meanings.Considering that the essence of strength reduction method is to calculate the slope’s strength,the definition method based on strength reserve is more consistent with the actual calculation.In the process of calculating the slope safety coefficient with the finite element strength reduction method,the commonly used slope stability criteria are discussed and selected.Through modeling,calculation and comparative analysis,the main judgment method of slope instability in the process of finite element strength reduction is selected,which is based on the sudden change of the maximum horizontal displacement of the slope and the penetration of the plastic zone.(2)Considering the double strength subtraction happen more in line with the real slope instability of slope geotechnical material intensity in the process of change,the double strength subtraction calculation in the process of slope stability,found using different reduction ratio on the slope to double strength reduction will have different critical state strength parameters,when using cohesive force and Angle of internal friction of strength on behalf of the slope,according to the intensity of "area" this concept,is deduced based on the area of "strength" double strength subtraction calculation formula for the slope safety factor,and through comparing with several computational expressions,solving the corresponding reduction than the scope of the type.(3)Considering the similarity between steady-state thermal analysis and steady seepage analysis in theory,definite solution conditions and other aspects,it indicates that the thermal analysis module in ANSYS can be applied to slope seepage analysis.The interaction mechanism of stress field and seepage field under fluid-solid coupling is analyzed in detail,and the mathematical model and the numerical calculation formula of finite element under fluid-solid coupling are obtained.(4)Combining with the engineering situation before and after the treatment of jiangjiayuan landslide in Xing Shan,Hu Bei province,a two-dimensional typical slope interface model was established to calculate and analyze the stability of the slope under natural state and rainstorm saturation state before and after the treatment,and it was found that the seepage effect on the stability of the slope was obvious.At the same time,the monitoring data after treatment are analyzed to show that the landslide treatment has achieved the effect. |
