| At present,China is vigorously developing the national economy,with the development of society,the slope problem with human activities highlighted.Especially in large-scale open-pit mining,railway and highway construction,largescale water conservancy and hydropower projects,such as slope problems are particularly prominent.Landslide,earthquake and debris flow have become the three major geological disasters in the world.Countries all over the world have invested a great deal of human,material and financial resources to find ways and means to solve these problems.In this paper,the influence of rainfall and earthquake on the slope stability is analyzed through the combination of theoretical analysis and numerical simulation.The specific research contents mainly have the following:(1)based on the site investigation of the mine and the Engineering Investigation data provided by the mine,the basic data of the engineering topography,geomorphology,geology and hydrology of the slope of the open-pit stope are obtained,and various factors affecting the stability of the regional slope are analyzed On this basis,the failure mechanism of slope under rainfall infiltration and earthquake is analyzed.It is concluded that rainfall and earthquake are the main influencing factors of the slope,and the failure mechanism of the slope under the action of rainfall and earthquake.(2)the basic rock mechanics parameters obtained by rock mechanics experiments on the spot sampling.Using Hawke's criterion and theoretical calculations,the material parameters needed to establish the model are derived Some parameters are obtained,such as compressive strength,Poisson's ratio,elastic Modulus,internal friction angle,cohesion and permeability Coefficient of rock mass.(3)the basic theoretical derivation process of saturated-unsaturated seepage flow is discussed in detail.The mechanical analysis of Slope Rock mass and the process of rainfall infiltration are described in detail.The variation of Slope Stability Coefficient under hydraulic action is analyzed and calculated.At the same time,the mechanical analysis of rock slope stability under earthquake is also discussed.The formula of Slope Stability Coefficient under rainfall and earthquake action is obtained,and it is concluded that the main factor of slope instability under water action is caused by static water pressure,while the effect of dynamic water pressure is not significant.(4)using MIDAS / GTSsimulation software,the seepage field variation of the model under different rainfall conditions(different rainfall intensity,same rainfall duration,different rainfall duration,same rainfall intensity,same total rainfall,different rainfall intensity,different rainfall duration)and the stability of slope are analyzed by finite element strength subtraction method.It is concluded that under different rainfall intensities,the greater the rainfall intensity,the greater the pore water pressure,and the greater the rate of slope stability decline;under different rainfall intensities,the longer the rainfall duration,the more obvious the pore water pressure in the slope The matric suction in the slope also tends to decrease,so the slope stability tends to decrease.(5)MIDAS / GTS software is used to analyze the displacement field,stress field and effective plastic zone of slope under earthquake action by applying different peak acceleration seismic waves And the change of slope stability under earthquake action.The results show that with the increase of the peak horizontal acceleration,the maximum displacement of the slope appears at the foot of the slope,and the maximum displacement is 0.3 g at the horizontal acceleration,and the stress increases gradually from top to bottom The effective plastic zone of the slope also shows a trend of expanding continuously,reaching the trend of penetrating when the peak acceleration is 0.3 g,and the stability of the slope also shows a trend of decreasing gradually,finally developing to the direction of instability. |
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