论文部分内容阅读
针对武广高速铁路无碴轨道红粘土路堑基床的动力稳定性问题,利用改造后的应力控制式动三轴仪代替目前国内尚无的剪应变控制式共振柱仪,测得了不同试验条件下红粘土体积动剪应变门槛值。提出了一套完整的短时动三轴试验方案和试验数据处理方法,为体积动剪应变门槛的确定开辟了新的试验途径。探讨了含水比、围压、固结比对体积动剪应变门槛的影响,给出了相应的回归经验公式。对比分析表明,采用应力控制式短时动三轴试验代替剪应变控制式短时共振柱试验测试体积动剪应变门槛是可行的。研究成果为高速铁路红粘土路基动力稳定性评价提供了宝贵的第一手资料,也为类似工程提供了有益的参考。
Aiming at the dynamic stability of the red clay cutting bed of ballastless track of Wu-Guang high-speed railway, the modified strain-controlled triaxial apparatus is used to replace the existing shear strain controlled resonance column instrument in our country. Red clay volume dynamic shear strain threshold. A complete set of short-time moving triaxial test scheme and experimental data processing method are proposed, which opens up a new experimental approach for the determination of dynamic shear threshold. The influence of water content ratio, confining pressure and consolidation ratio on the dynamic shear stress threshold of volume was discussed, and the corresponding regression empirical formula was given. The comparative analysis shows that it is feasible to use the stress-controlled short-time triaxial test instead of the shear strain control short-time resonant column test to test the dynamic shear stress threshold. The research results provide valuable first-hand information for the dynamic stability evaluation of high-speed railway red clay subgrade and also provide useful reference for similar projects.