| In recent years,with the continuous heating up of highway construction in mountainous areas,more and more adverse geological sections are encountered in the construction process.The stability analysis and treatment measures of adverse geological high slope have become one of the current research hotspots.In southwest China,there is a large amount of rainfall and frequent earthquake action,and there is a wide distribution of carbonaceous shale in this region.This rock is soft rock,with poor water rationality,easy disintegration,low strength and other engineering characteristics,which is extremely unfavorable to the stability of slope.In this article,through indoor experiment,theoretical analysis and numerical simulation,such as research methods,under the condition of rainfall,earthquake and under the condition of rainfall and carbonaceous shale under the condition of seepage law of cutting slope,the stability of slope deformation feature points and to study the change rule,to evaluate the dynamic stability of side slope at the same time,provide certain reference for relevant engineering design and construction.The main research contents and results of this paper are as follows;(1)The laboratory test was conducted on the carbonized shale,and the least square method was used to process the test data to obtain the basic test parameters such as the Gross volume density,Elastic Modulus,Poisson’s ratio,Cohesion and Internal friction angle.The V-G model was used to fit and the characteristic curve of the soil water of the carbonized shale was obtained.(2)According to the regional meteorological and hydrological data of the slope and combined with the saturation-unsaturated seepage theory,the analysis working conditions under different rainfall conditions were designed and the rainfall infiltration model was established.The development and change rules of pore water pressure,volume water content and saturation,the change rules of slope safety factor and the correlation between safety factor and instantaneous rainfall intensity and cumulative rainfall are obtained.(3)According to the basic seismic intensity of the slope area and combined with the dynamic analysis theory,the analysis working conditions under different seismic intensity were designed and the seismic analysis model was established.The time-history curves of slope displacement field,maximum shear strain and safety factor under seismic conditions are obtained,and the comprehensive evaluation method of slope dynamic stability with minimum average safety factor and cumulative permanent displacement is determined.(4)Considering the effects of rainfall and earthquake,the working conditions with different intensities of equal rainfall intensity and different intensities of equal rainfall intensity were designed,and the rainfall earthquake analysis model was established.The variation law of slope displacement field and maximum shear strain under rainfall and earthquake is obtained,and the slope stability is evaluated and compared with the results only under earthquake. |
