无砟轨道结构抬升用高聚物注浆材料剪切黏结性能研究

为了研究高聚物注浆抬升后无砟轨道结构的稳定性,通过无砟轨道结构实尺模型抬升试验,揭示了高聚物注浆材料的扩展形态及固结体的密度分布规律,并模拟高聚物注浆材料与支承层混凝土的黏结,研究了高聚物注浆材料固结体的剪切黏结性能及压缩性能。结果表明,高聚物注浆材料在无砟轨道下方呈椭圆形扩展,与支承层混凝土形成良好黏结,距抬升孔越近固结体密度越高;随着固结体密度的增加,固结体的压缩强度及剪切黏结强度均逐渐增加,固结体的弹性模量和剪切黏结模量略有增大;固结体的压缩和剪切黏结强度明显高于级配碎石,但弹性模量和剪切黏结模量与级配碎石相当,这确保了服役中高聚物注浆材料固结体能够与级配碎石同步变形、协同受力,保证了抬升后无砟轨道结构的稳定性。

Study on Shear Bond Properties of Polymer Grouting Materials for Uplift of Ballastless Track Structure

In order to study the stability of ballastless track structure after its uplift using polymer grouting material,a full-scale model test was carried out.The extension form and density distribution concretion of polymer grouting material were revealed.By simulation of the bond of polymer cement concrete grouting material and bearing layer,the shear bond properties of polymer material and compression performance were studied.The results show that the polymer grouting material expands elliptically under the ballastless track and forms a good bond with the supporting layer concrete.With the increase of concretion density,the compressive strength and shear bond strength gradually increase,and the elastic modulus and shear bond modulus concretion slightly increase.The compression and shear bond strengths of concretion were significantly higher than those of graded crushed stone,but the elastic modulus and shear bond modulus were on the same level.This ensures that the high polymer material grouting concretion has synchronous deformation and same stress with graded crushed stone,and ensure the stability of the ballastless track structure after uplifting.