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Study of Append-mass Method for Quality Evaluation of Earth-rock Filled Roadbed

Author: YuanLinYang
Tutor: ChaiHeJun
School: Chongqing Jiaotong University
Course: Road and Railway Engineering
Keywords: single freedom linear elasticity system append-mass earth-rock filled subgrade numerical simulation Fourier transformation
CLC: U416.1
Type: Master's thesis
Year: 2009
Downloads: 89
Quote: 0
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Abstract


In the most mountain area, the mount of soil can not meet the need of construction. So, rock which contain some soil, the rate maybe over ten percent. The sand replacement method and the water replacement method did not be used in density test of roadbed filled with earth-rock mixtures. Then, many work were conducted on it by researcher. And many evaluation indexes had gotten. All of them are based on the compactness and experiential formula. It worked very well. But the experiential formula is hardly been spread. The index compactness became easy as the reason that the method for getting max dry density of earth-rock mixtures has been obtained. This paper based on project of macro-size soil subgrades evaluation index and testing method on the theory of control of uneven settlement(No. cstc,2008ac6047 ). The work was conducted as follow:(1)Formula for mass, depth and density of earth-rock which vibrate with append mass conducted by analyze single freedom linear elasticity system and vibrated earth-rock system;(2)Fourier transformation is used for the data which gotten from outside or numerical simulation. On the example of velocity, some roles for breaking data was illustrated. Relational curve between time and optimization frequency which contain the most energy has been obtained;(3)Method of numerical simulation was used for density test of earth-rock roadbed in append mass. The relate error rate between simulation result and model below one percent;(4)Test precision, when the bearing plate is square, is lower the cycle. And precision was affected by diffuse angle of earth-rock which vibrated with appending mass, and the rate between side or radius and depth of vibrated earth-rock. The diffuse and rate is bigger, the precision is lower;(5)formula for sure appending mass of the nearest test was conducted by analyzed the relation among of frequency, mass and stiffness coefficient of single freedom linear elasticity system when resonance is happened on the system compose by append-mass and earth-rock which resonance with append-mass.

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade
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