Stability Analysis Of Loess Slope Solidified By New Soil Stabilizer

Loess shows poor engineering properties, such as high compressibility,collapsibility, low strength etc., so it couldn’t meet the design, construction andusage requirement of highway, railway subgrade and water conservancy damfoundation until it had been treated. There are various disposing methods inengineering, such as filling, piling, joining with curing materials and so on.These different methods have different effect. New solidified agent is beingextensively studied and used in engineering due to its excellent mechanicalproperties.On the basis of referring on correlation literature and experiment, it can beconcluded that SH can improve the properties of loess. This dissertation isfocused on the numerical simulations about stability of solidified loess slope toanalyze and study.The main work and achievements are as follows:(1) Related experiment and result analysis of loess solidified by curing agentSH were conducted. According to the curve of SH content and water contentinfluencing the shearing strength of solidified loess, some conclusions are obtained. SH curing agent can significantly improve the shear strengthparameters of loess. The effect of SH on loess cohesion is more than on internalfriction angle and water content has significant effects on the shear strength ofsolidified loess. The experiment data provide scientific facts for the parameterselect in slope stability numerical modeling.(2) BP neural network prediction model was established. During theanalysis of the influence of water content on the shear strength of loess, indoorsoil test data was chosen as the study sample and test sample. Then the influenceof water content on the mechanical parameters was predicted. Forecast resultwas matched with test results approximately. So it is feasible that BP neuralnetwork was used to predict the influence of water content on the mechanicalparameters. This model provides a new technology to make the physical indexestransferring to the physical mechanical parameters.(3) Applied strength reduction method to ABAQUS，the slope stability ofsolidified loess was analyzed. And it was simulated on the effect of physical andmechanical parameters such as Young’s modulus, Poisson’s ratio, consolidationdepth, slope angles, water content and densities to the slope stability. In thedeformation analysis of loess slope, the feasibility of mixing the new curingagent SH with the loess surface is analyzed and proofed. The study shows: watercontent and soil density have significant impact on the horizontal, uplifted andglided displacement of solidified loess slope, while the Young’s modulus,Poisson’s ratio and slope angle have little influence. By sensitivity analysis, the optimum mixed thickness and influencing factors of new curing agent SH wereobtained. Simulation results show that: water content has greatest sensitivity onthe safety factor of slope, followed by density, Young’s modulus and Poisson’sratio. This conclusion is consistent with the analysis of slope deformation. So,extra attention should be paid to the influence of water level variation on theslope stability during construction or operation, and the relevant work ofprevention and treatment should be well done.Above all, it is scientific and reasonable that curing agent SH is applied tothe loess slope. The research conclusion provides a theoretical basis andreference value to the improved technology of loess slope and prevention ofgeological disasters.