有机高分子改性土动力特性试验研究

Experimental study on dynamic properties of soil modified by superpolymer

翻浆冒泥是铁路路基主要病害之一。由于翻浆冒泥造成基床的软化和道碴板结引起道床整体弹性的降低 ,直接影响列车安全运营。实践证明用化学灌浆方法整治这种病害可取得良好效果。为评价选用的有机高分子浆液对路基基床上的改性效果 ,模拟现场土性条件、应力条件、列车循环动力条件和排水条件 ,进行了室内循环动三轴试验。试验结果表明 ,有机高分子浆液改性土动强度显著提高 ,动力特性明显改善。

Mud boil, one of the main railway roadbed diseases, has a direct effect on the safe run of trains, because it may cause the decline of roadbed elasticity through softening of bed and hardening of ballast. It is proved practically that chemical grouting can do with it. For evaluating the positive role of the selected superpolymer to the soil in roadbed, this paper operates the dynamic triaxial test by simulating the properties of soil, the static stress, the cyclic dynamic stress and drainage condition in site. The results show that dynamic strength of the modified soil by superpolymer increases in a considerable degree. The dynamic properties also get a conspicuous reformation. Subsequently the positive role is affirmed in engineering practice.