Study On The Stability Of Typical Soil Slope Under Dynamic Response In G318 Tibet

The environment many mountainous and multiple earthquakes in our country has brought a lot of stability problems of slope under the action of earthquake.In recent years,the problem of slope dynamic stability has been paid close attention by researchers,and it has also become a hot topic in the field of geotechnical engineering.The Sichuan Tibet highway is one of the two major traffic lifelines connecting Tibet to the mainland.Not only does it play a very important role in promoting the economic development,but it also correlates with the environmental investment in the southeast of Tibet.Therefore,it has played a great role in consolidating national defence and promoting inter-ethnic exchanges and intergration.It is also an important requirement for building a beautiful Tibet in strategic thinking of ’governing a country must govern the border,and the first thing to govern is to keep a stable reserve’.On the basis of the slope stability evaluation scheme,the paper studies the slope stability with the combination of theoretical analysis and numerical simulation on the basis of the slope stability evaluation scheme,and studies the change law of the internal displacement and stress and strain under the action of the earthquake load on the basis of the slope stability evaluation scheme,which is based on the slope stability evaluation scheme of the 318 National Road.The overall response of the slope is changed with the dynamic response of the slope.The main study contents and conclusions are as follows:(1)the safety factor obtained by the strength reduction method is compared with the pseudo static method simplification(Bishop)method,and the safety factor of the slope under the pseudo static method is obtained,and the numerical value is partial to safety.(2)based on the topographic and geological conditions which rely on the selected points,A typical finite difference FLAC3 D software is used to establish typical soil slope model and calculate the static force.The displacement and stress have a certain character,they are controlled by the gravity of the slope body.(3)through numerical simulation analysis,the displacement and stress cloud chart of the original anti-slide pile under the action of weight is similar to the stress state of the cantilever beam,and the stress concentration is appeared in the contact surface of the anti slide-pile and the bedrock.(4)starting from the dynamic response law of the dynamic model of the slope under the earthquake action,the changing trend of velocity and acceleration on the six monitoring points on the slope is analyzed.In this paper,six representative time history curves from the foot to the top of the slope are selected to analyze the internal addition of the slope under the action of the earthquake.The law of velocity and velocity shows that both of them have unfavorable tendency to slope stability.(5)the results obtained in this paper can provide reference for the stability analysis under the similar slope earthquake,and the real-time monitoring should be carried out for the selected point slope,so as to ensure the prevention measures in advance.