Study On The Stability Of Shangma Village Landslide In Wuhu-Tongling Highway

The occurrence of landslides is usually the result of coupling factors, especially water has very important influence on the stability of landslides. Large-scale overhead surface invading in the front of the slope is another significant factor.This paper takes ShangMa Village Landslide as the vestigated subject, through studing the environment of this landslide, the engineering geology condition and man-made factors. Comprehensive analysis show that landform and physiognomy,formation lithology and geological structure are intrenal factors which cause the occurrence of Shangma Village landslides,rainfall is the primary inducing factor which causes the distortion and destroys to the landslide and excavates in the front of the landslide is the important inducing factor which causes the outbreak of this landslide. Study on the effective mechanism to the stability of the slope caused by rainfall and artificial excavation of the slope-front, combining the observation data of the distortion. Simultaneously, analysis on the acting mode caused by the upper slope body to the lower body slope in the layered slippery body has been made.Through analysis of the sensitive factors to the affection of the landslide stability, it is obtained that the maximal influential factor is the mechanical properties in the slippery belt earth, particularly the internal friction angle .This paper has selected the slippery belt earth shearing strength target reasonably (cohesive force c and angle of internal frictionφ),and calculated the stability of the shallow sliding body and the middle sliding body to this landslipe through finite element method under different operational mode.This paper has simulated the stress-strain under two kinds of operating modes, the water saturated state and excavation of the front-slopebody through FLAC3D.The simulated result shows that: while being excavated, the landslide mainly undertakes compressive stress and the sliding face is the concentration region of the stress. under this condition the danger of the landslide is existent.With water function, the tendency that the landslope slides along the sliding face is relatively more obvious than that under the nature condition and the horizontal and vertical displacement increase further.At the same time the plastic region is destroyed further so as to form the destruction area. The results of stability evaluation coincides with the objective reality actually.