Visual Software Development For Stability Analysis Of Soil Slope Based On Unified Strength Theory

Slope instability and failure is one of the most commonly encountered problems in civilengineering, and the stability calculation is coeval with it. With the rapid development ofcomputer, the calculation method of slope stability has expanded from early manualcalculation to today’s computerization. However, the currently softwares are mostly foreignsoftwares, and the operation is complex, It requires the user to have higher professionalknowledge, and it’s offen expensive, so they are not suitable for the engineers to use,Compared with the foreign softwares, the domestic softwares development are relativelylagging and slow. Based on the Unified Strength Theory, the author uses the Visual C#language to develop a visual software for stability analysis of soil slope, and uses the softwareto verify the instances and research the related laws. The main research contents andconclusions in this paper include:(1) The inner friction angel φtand cohesion Ctof soil are deduced based on the Triple-shearstrength theory of Xiao-rong Hu, and apply them to the calculation formulas of Felleniusmethod and Simplified Bishop method in order to reflect the influence on soil strengthparameters and safety factor Fsof the intermediate principal stress parameter b and the Lodestress parameter μ．(2) According to the modular design idea and good human-computer interaction principle,using Visual C#language to develop the software in Visual Studio2013developmentenvironment. Through the comparison and verification of a large number of examples in theliteratures, it shows that the software has the advantages of accuracy and simple operation.(3) Using the software to make a large number of calculation experiments，it shows that:Under the Double-shear and Triple-shear stress state, the image of inner friction angel φt,cohesion Ctand safety factor Fspresents special regularity along with the change of Lodestress parameter μ and the intermediate principal stress parameter b. Slope angle, innerfriction angle φ, cohesion C and intermediate principal stress parameter b have a greatinfluence on the stability of slope, and the change of these factors presents certain correlationalong with the change of safety factor Fs. The singularity of the subsection point and the intermediate principal stress effect of the Twin-shear are verified.