| "Chuanjiu road" after the "8.8" jiuzhaigou earthquake,the slope along the poor geological development,prominent disaster problems,serious impact on driving safety,party committees and governments at all levels pay great attention.Based on the research background of slope with typical geological disasters along "chuanjiu road",this paper mainly studies the stability and protection technology of typical slope(collapse,landslide and dangerous rock)along this road,as follows:(1)The bad geological characteristics of the slope along the line were investigated and the main factors affecting the instability were found out.By comparing the advantages and disadvantages of the common analysis methods for slope stability,it is found that the numerical analysis methods such as finite element method can better meet the needs of the targeted research along the slope.(2)the limit equilibrium method was compared with the numerical simulation method to verify the reliability of the numerical simulation.The parameter sensitivity in the strength reduction method was analyzed and studied through the midas-gts NX finite element software.The results show that the slope safety coefficient increases with the increase of internal friction Angle and cohesive force,but the cohesive force is more sensitive.The change of slope Angle has great influence on slope safety coefficient.The ratio of internal friction Angle to cohesive force has little influence on the sensitivity of safety coefficient.(3)The corresponding numerical model is established for the slope of typical disaster type,and the stability analysis and evaluation are carried out.The results show that the safety coefficient of K32+224~K32+415 landslide is 1.02.The maximum displacement in the X direction occurred at the retaining wall at the foot of the original slope,with a maximum displacement of 67.7cm.The maximum settlement in the Y direction was 13.8cm,and there was a large uplift at the foot of the slope(i.e.,the inner subgrade).Slope of rock joint fracture zone in K9+725~K9+785 section: safety coefficient 1.05;The maximum displacement of the slope in the direction of X appears in the upper part of the concave rock cavity at the foot of the slope,with the maximum displacement reaching 74 cm.In the direction of Y,there is a large vertical displacement with a maximum value of 36 cm at the fracture zone of highly weathered joints.There is a uplift phenomenon at the foot of the slope and a local bedding sliding trend.(4)This paper introduces the commonly used protection technology and its application range in slope engineering,puts forward the corresponding measures and Suggestions according to the bad geological characteristics and ecological protection demand along the slope,and establishes the corresponding numerical model for the slope of different support types,compares and analyzes the stability effect and the stability evaluation of the earthquake working condition,and selects the better support measures.The analysis results show that the soil landslide in K32+ 224-k32 +415section: the bolt + lattice beam support scheme with better comprehensive effect,less disturbance and more conducive to the local stability of the slope is selected.Section K9+725~K9+785 rock jointed fracture zone slope: the shear slope support with smaller deformation and displacement and smaller plastic zone scope and better safety is selected to meet the stability requirements by checking calculation under seismic conditions. |
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