Experimental study on foamed concrete as a filler of the bottom layer of&nbsp; high speed railway subgrade

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (6) : 179-186.

Experimental study on foamed concrete as a filler of the bottom layer of high speed railway subgrade

ZHAO Wenhui1,2,SU Qian1,2,LI Ting1,2,HUANG Junjie1,2

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Abstract

When the additional second-line is built on the soft soil areas, interference problems for the existing lines would be caused by the traditional methods.In order to solve these problems, the foamed concrete used as a filler was introduced. According to the results oftriaxial tests, the foamed concrete with the casting density of 600 kg/m3 can meet the static and dynamic conditions of the bottom layer of high-speed railway ballastless track subgrades. Using this material as the filler of the bottom layer of subgrade, large-scale indoor model tests were carried out. The results show that the subgrade structure has good dynamic stress diffusion effect when the foamed concrete is used as the subgrade filler. It has large stiffness and small plastic deformation, which guarantees small elastic deformation (dynamic displacement) and small cumulative settlement value. The foamed concrete subgrade has a good dynamic performance and long-term dynamic stability, and it can ensure the smoothness of subgrade surface, meeting the requirements of long-term service in high-speed railway.

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high speed railway / foamed concrete / bottom layer of subgrade / experimental study

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ZHAO Wenhui1,2,SU Qian1,2,LI Ting1,2,HUANG Junjie1,2. Experimental study on foamed concrete as a filler of the bottom layer of high speed railway subgrade[J]. Journal of Vibration and Shock, 2019, 38(6): 179-186

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