Study On Dynamic Characterisitics Of Soilbag Foundation Under Traffic Load

With the development of the times,green economy is gradually becoming the main mode of economic growth.Woven soilbag bag as a simple processing can be obtained,which has drawn large,and bag filling from sand to clay and gravel from gravel to the abandoned building materials can meet the application requirements,and greatly reduce the cost of materials,according to local conditions,local materials.soilbag sandbag is widely used in foundation reinforcement,reclamation,flood control and port construction and other fields,the technology has made great progress.However,the current use of soilbag mainly summarized on the previous engineering experience as the basis and standard of soil sand in the process of using the dynamic response parameters are rarely related to.In this paper,the shortcomings of this research,launched the following main aspects of inquiry:(1)The indoor model test,the main test by controlling the traffic load model tank different output frequency,amplitude and phase(load vibration exciter with different number of output parameters),study the response characteristics of three different materials filled with acceleration and soil pressure force.The test results show that the effect of vibration frequency on the three kinds of model materials;loading amplitude on the same test results showed that the positive feedback model with slot power output value is greater,the dynamic response characteristics of value increases;increasing the number of vibration exciter,the dynamic response of the characteristic value of month obviously.When the vibration frequency is 15Hz,the output amplitude is 7500N and the number of exciter is 3,the power output value of the box reaches the peak value.The test results show that different particle size filling soilbag the dynamic response characteristics of different,specific performance:the dynamic response and the filling particle size is negatively related to the size of eigenvalues,i.e.filling particle size increasing,the response value is small,In this experiment,the response values are as follows:the river sand is the largest,the middle sand is second,and the coarse sand is the smallest.The test results also show that the larger the particle size of the filling in the bag,the greater the settlement of the concrete block on the top of the model box.(2)Carried out a series of indoor geometric scale model test,test of three kinds(gravel,coarse sand,river sand)dynamic response characteristics of railway subgrade internal material of soilbag filled in different vibration frequency and amplitude and phase of the complex vibration.The test results show that the vibration isolation effect of Subgrade Earthwork bag cushion and the bag under the train load in the filling material is proportional to the diameter of the filling material,the larger particle size,the smaller the value of the dynamic response characteristics,the better isolation effect.On the test results data,the depth of processing,fitting the formula of general rules of the center of the earth pressure and the basic profile of the earth pressure distribution,and the distribution of acceleration based within a general formula fitting formula directly reflects the influence of distance based internal position of vibration and vibration frequency on earth pressure and acceleration,high practical significance.(3)The three kinds of sand(sand,medium sand and coarse sand)bending test,shear wave velocity of sand were calculated(Vp)and compression wave velocity(Vs)and soil dynamic parameters(the modulus M,shear modulus G)and Poisson's ratio v of the material;damping mechanism of sand by comprehensive analysis,the practical guiding significance for the engineering practice of the conclusion.(4)The research in this paper has high practical value,but it is still not comprehensive enough.The author puts forward his own suggestions on the specific direction and ideas of the research in this field.