【作者】 程远水；

【导师】 张千里；

【作者基本信息】 铁道部科学研究院 ， 岩土工程， 2007， 硕士

【摘要】 本论文主要工作有：（1）针对目前国内无碴轨道路基压实控制参数众多及国际上不同压实标准体系采用不同压实参数的特点，开展有关路基填筑压实参数相关关系的现场试验研究；（2）通过室内回弹模量及波速试验建立起对路基填料压实指标K₃₀、E_v2的事先估计；（3）结合高速铁路路基填料的选择，开展改良土特性及控制指标的研究。基于上述问题，通过现场试验、室内试验及理论分析得到如下结论：（1）路基压实参数中力学指标之间有一定的相关性，物理指标之间也有较高的相关性，但是力学指标与物理指标间相关性很低。通过对E_vd、E_v2及K₃₀的分析可以得出它们均是由介质模量控制的，它们间的相关性最好，它们对路基压实质量的控制标准基本上是一致的。（2）通过对E_v2、K₃₀相关关系及K₃₀／E_v2值的分布情况的分析，可以看出我国与德国的路基压实标准是大体相当的。（3）对于同一种填料，可选取1～2种力学指标以及1种物理指标作为路基填筑压实的控制指标。（4）E_v2更适合评价路基承载力。E_v2值受干扰较小，在E_v2／E_v1满足一定条件的情况下，建议用E_v2值作为路基评价标准。（5）理论上回弹模量E_e及v_s²与地基系数K₃₀基本上为线性关系，实际室内试验所得结果也显示它们之间存在较好的线性关系，可以利用室内回弹模量试验及波速试验对地基系数K₃₀进行事先预估，再利用K₃₀与E_v2之间的相互关系，亦可实现对变形模量E_v2的事先估计，从而可以避免填料选择的盲目性。波速试验较回弹模量试验简便、快捷，不存在接触界面影响的问题。（6）改良土的控制指标既要考虑与普通填料一致的常规指标的要求，又要针对其特性对其特殊指标进行要求。（7）针对改良土本论文提出：将K作为其填筑压实控制指标；K₃₀、E_v2、E_vd、CBR作为其模量及变形控制指标；无侧限抗压强度、抗剪强度指标C、Φ值作为其强度控制指标，湿化质量损失率、冲刷量、有荷膨胀率作为其水稳性控制指标，临界动应力、干湿循环质量损失率作为其耐久性控制指标。（8）压实系数K、地基系数K₃₀、变形模量E_v2、动态变形模量E_vd、无侧限抗压强度等作为改良土的基本控制指标，其它指标根据实际情况、工程重要性、设计要求等选取。从而使改良土的性能应不低于拟选用的A、B组填料的性能。更多还原

【Abstract】 The principal work of the paper includes: （1） In view of the feature——the current domestic ballastless track subgrade compaction control indexes and the many different international compaction standard system using different compaction indexes, launched the field test study of correlativity between subgrade compaction parameters;（2）Through laboratory modulus of resilience and shear wave tests, established the prior estimate to subgrade fill compaction indexes——K₃₀ and E_v2;（3）Combining the select of subgrade fill to high-speed railway, launched the study of characteristics and control indexes to improved soil.Based on the above issues, through field tests, laboratory tests and theoretical analysis, the following conclusions is gained:（1） Subgrade compaction parameters mechanical indexes have some relevance, physical indexes have higher relevance. However, mechanical and physical indicators correlation is very low. Through the analysis of correlation about the mechanical indexes E_vd、E_v2、K₃₀ , can be drawn from them that they are controlled by medium modulus and the relevance between them is the best and we can also see they are basically the same in subgrade compaction quality control standards.（2） Through the analysis to the correlativity of E_v2、K₃₀ and the distribution of K₃₀/E_v2 value, China is generally equivalent with German in subgrade compaction standard.（3） With the same fill, we can choose a two-species mechanical indexes and one physical index as the subgrade fill compaction indexes.（4） E_v2 is more suitable for subgrade evaluation capacity. E_v2 has smaller effect to interference, in E_v2/E_v1 meeting certain conditions circumstances, proposed to use E_v2 value as subgrade evaluation criteria.（5） Theoretically ,modulus of resilience E_e and v_s² seperatly exists in a strictly linear relationship with K₃₀, actual laboratory test results also showed that a good linear relationship exists between them. laboratory modulus of resilience and shear wave tests can be used as the prior estimate of foundation coefficient K₃₀, Reusing the correlativity between E_v2 and K₃₀, but also to achieve prior estimate to deformation modulus E_v2. thus can avoid blindness in fill choice. Contrast resilient modulus test, shear wave test is simpler and faster, and there is no contact interface problems.（6） Improved soil control indexes will have to consider in line with the general fill in the conventional indexes, as well as those of their special characteristics of its indexes request.（7）Against improved soil, the paper presents : K will be as compaction control index; K₃₀、E_v2、E_vd、CBR as modulus and deformation control index; Unconfined compressive strength, shear strength index C,Φvalue as its intensity control index; slaking loss rate of quality, wash loss rate of quality, swelling rate in loading as water rate stability control index; Critical stress, the wet and dry cycles quality loss rate as its durability control index.（8） Compaction coefficient K, foundation coefficient K₃₀, deformation modulus E_v2,dynamic modulus of deformation E_vd, unconfined compressive strength are as the basic control indexes to improved soil. According to the actual situation, the importance of construction and design requirements , Other indexes are selected. Thus improved soil properties should not be lower than that intended for use in the group A and B fill performance.更多还原