Study On Formation Mechanism And Control Measures Of Expansive Soil Landslide

In recent years,landslides in the highway and high-speed railway project in the proportion of growing,so many scholars on the formation mechanism of landslide and governance measures more and more,especially for the special landslide stability research is long lasting.Based on the analysis of the expansive soil landslide in the Ximen County test station,the deformation of the expansive soil is analyzed and studied.The deformation characteristics of the anti-slide pile,the changing characteristics of the inclined hole and the change of the surface displacement To develop the area of landslide control measures.Finally,the landslide is analyzed by Midas-GTS software,and the optimization model is analyzed by supporting the results so as to achieve the best protection effect under the most economical conditions.The main contents of this paper are:(1)To review the relevant literature,to understand the status of the study of expansive soil landslide,clear expansive soil of their own engineering characteristics and the impact of expansive soil landslide factors and expansive landslide instability mechanism.(2)According to the actual situation of the scene to develop landslide monitoring program.In the field,two kinds of spindle sections were selected for deep hole displacement monitoring,six holes were designed and the depth of hole was 40 m,the SWT map was drawn from the monitoring data,the change of borehole displacement and the depth of water depth with time were compared and analyzed,and the variation of the horizontal displacement of each borehole with depth.The earth pressure value of the anti-slide pile is measured,and the internal force of the anti-slide pile is measured by symmetrical setting of the anti-Which can be calculated from the anti-slide pile bending moment.(3)According to the actual soil layer and support situation,MIDAS GTS is used to establish the t According to the actual soil layer and support situation,MIDAS GTS is used to establish the two-dimensional finite element model.The horizontal displacement of the pile is 4.71 cm,4.48 mm,respectively,in the case of single row pile,double row pile and three row pile support Cm,4.20 cm.At the same time,the distribution law of pile moment with depth is obtained,and the position of potential slip surface and the safety factor of landslide after reinforcement are obtained.The calculated results show that the reasonable finite element model can effectively describe the internal force and deformation mechanism of the landslide during the construction process.The results show that the reasonable finite element model can effectively describe the internal force and deformation mechanism of the landslide during the construction process.(4)Finally,by changing the number of anti-slide pile,the stress and deformation mechanism of the landslide in the construction process under different anti-slide piles design scheme are studied.And the safety factor under the design scheme of each anti-slide pile is 1.1,1.15,1.35,1.61 respectively.It is found that the safety factor is the lowest when the anti-slide pile is installed,and the safety factor of the three rows of piles is the highest,taking into account the actual economy.