城际铁路黄土路基填料室内力学控制标准

为优选路基填料,保证施工后铁路路基力学强度满足相关规范要求,通过现场地基系数K30试验建立K30与压实度、含水率的关系,取现场土样在相同压实度与含水率条件下成型室内试件,并通过CBR试验测定相应的浸水CBR0、非浸水CBR1,从而建立现场地基系数K30与室内CBR的经验公式,并基于规范对现场填料要求提出室内力学控制标准。结果表明：随着压实度的增加,K30、CBR0与CBR1均线性增加；随着含水率的增加,K30与CBR1线性增加,而CBR0呈减小趋势；CBR0与K30相关性较差,而CBR1与K30具有良好的线性关系,K30=1.91CBR1+35,R²=0.93。对不同铁路等级、设计速度与结构层位的路基填料,可采用室内非浸水CBR作为填料预选的力学控制标准。

Indoor mechanical control standard for loess subgrade filling of intercity railway

In order to optimize the subgrade filling material and ensure that the mechanical strength of the railway subgrade after construction meets the relevant specifications, the relationship between K30 and the degree of compaction and moisture content is established through the field foundation coefficient K30 test, and take the field soil samples under the same compaction and moisture content conditions to form indoor specimens, and determine the corresponding water-immersed CBR0 and non-immersed CBR1 through the CBR test, so as to establish the empirical formula of the field foundation coefficient K30 and the indoor CBR, and put forward the requirements for the field filler based on the specification Indoor mechanics control standard. The results show that with the increase of compaction, K30, CBR0 and CBR1 all linearly increase; with the increase of water content, K30 and CBR1 increase linearly, while CBR0 shows a decreasing trend; CBR0 has a poor correlation with K30, while CBR1 has a good linear relationship with K30, K30=1.91 CBR1+35, R²=0.93. For subgrade fillers of different railway grades, design speeds and structural levels, indoor non-immersion CBR can be used as the mechanical control standard for filler preselection.