Study On Seismic Performance Of Local Reinforced Embankment

Embankment reinforcement engineering is an important measure to protect subgrade disease and ensure the stability of subgrade.The main purpose of embankment reinforcement measures is to suppress embankment settlement and control of slip surface,improving the safety and stability of the embankment.In this paper,a new partially reinforced embankment is proposed,in which the reinforcement is laid in the upper part of the embankment.Due to the reinforcing effect of the reinforcement material,the potential slip surface of the embankment is reduced to a local extent,so as to control the occurrence location of the potential slip surface.Under the strong action,stability of the upper embankment will not be affected basically even though the stability of the embankment will be partially damaged,and the basic traffic performance of the road is still maintained.Fist,in view of the partial reinforced embankment model put forward,the load experiment of the model exerted uniform vertical load on the embankment model of reinforced earth embankment with different numbers of reinforcement layers to study the reinforced embankment settlement,slope deformation,reinforcement embankment deformation,internal soil pressure and other indicators affect the performance of different reinforcement layers on the deformation of reinforced embankment.Secondly,through the shaking table model test of reinforced embankment slope with internal acceleration response rules of deformation reinforcement embankment deformation,internal pressure and other indicators of soil subgrade and embankment everywhere within the acceleration response,reinforcement strain,soil pressure changes and embankment displacement,get the dynamic response characteristics of embankment the model of different acceleration loading?Experimental results show that:1)The embankment reinforcement has effective control over the settlement of embankment.Compared with the whole section reinforced embankment,local reinforced embankment although inhibition of uneven settlement of embankment,limit the effect of the lateral deformation of the soil,but wanes,the smaller the reinforcement performance is not obvious.2)In the process of loading vibration,the unreinforced embankment model can slip and destroy.Because of the backpacking effect of the reinforced embankment onthe whole section,the embankment slope is bulging.The upper slope of the local reinforced embankment model is bulging,and the unreinforced part of the lower part is damaged by slip.3)Embankment model under earthquake force,earth pressure inside the embankment and reinforced material strain periodic increase or decrease with the increase of vibration table mesa distance monitoring distance,each point in the embankment model the response of the acceleration amplification coefficient showed a trend of increase.The reinforcement measures can significantly reduce the amplification effect of embankment on the seismic wave and the amplification effect of reinforcement on the upper seismic wave of embankment is less obvious.4)The reinforcement measures can effectively restrain the subsidence of embankment pavement and the local reinforced embankment may reduce the subsidence effect of the embankment on the whole section,but its attenuation is lower.Under the effect of small amplitude and small frequency loading,the seismic performance of the whole section reinforced embankment model and the local reinforced embankment model is less.5)The local reinforced embankment reinforced material is nearly half,which has a high cost performance compared with the whole section reinforced embankment.