Experiment Study On Rock-filled Embankment & Model Parameter's Back Analysis On Rock-filled Object

With the rapid development of highway in middle-west region ,the rock-filled embankment has been widely applied. However, the existing subgrade density inspecting method has been unable to meet the requirement of the rapid-developing highway construction. Furthermore those parameters obtained from experiment are usually not satisfying. So it is of significant theoretical and practical value for study on a convenient, non-damage, precise subgrade density inspecting method and on model parameters back analysis based on field measured data.At first, in light of similarity theory , a indoor model test was designed , the result of which indicated that it was difficult to set up a quantitative relation with the density by shock frequency analyzing and dynamic stiffness analyzing. On the contrary, it turned out to be a sound linear relation between the density and the vibrating mass calculated by additive mass method, which was consequently adopted as the rock-filled embankment density inspecting method. In addition, the equation could be gained by experimental data fitting and the method was brought out in detail as a reference when it is proved into practice. PVC and water pipe settlement observing equipment were first applied on rock-filled embankment and proved out to be reliable and convenient. A locate large-scale shearing test was designed and carried out at the experimental road and the shear strength index c, φ could be worked out with relative theory applied. With settlement mechanism during construction and based on field measured data, the Duncan non-linear model was selected and the rock-filled object model parameters back analysis method was put forward with genetic algorithm and finite element method introduced. A relative programme was also worked out. At last, with the field measured data of ChangZhang highway and ZhaiRen road analyzed, the reliability and rationality of the method was deeply probed. The result indicated that the rock-filled object model parameters back analysis method proposed in this paper can meet the request of the practical engineering.