摘要
以出现上拱病害的兰新二线无砟轨道地基中的重塑泥岩为研究对象,在室内进行不同土样厚度和不同含水率条件下的重塑泥岩无荷膨胀试验。结果表明:重塑泥岩的吸水膨胀过程可以分为加速膨胀、缓慢膨胀、趋于稳定3个阶段,土样厚度成比例增大时,最终膨胀量并不成比例增大。据试验结果拟合出了土样厚度和含水率耦合作用下重塑泥岩极限膨胀量计算公式。经同等条件下平行试验检验,该膨胀量计算公式具有良好的适用性。
Taking the remolded mudstone of ballastless track foundation in the second Lanzhou-Xinjiang railway where upper arch diseases appeared as the research object,the indoor unloaded expansion tests of remolded mudstone were carried out under the conditions of different soil sample thicknesses and different water contents.The results show that the water absorption expansion process of the remolded mudstone could be divided into such three stages as accelerated expansion, slow expansion and stabilization,and the final expansive capacity does not increase in proportion to the thickness of soil sample.Based on the experimental results,the limit expansive capacity calculation formula of remolded mudstone was concluded under the coupling action of soil sample thickness and water content,which has good applicability identified by the parallel tests under the same condition.
出处
《铁道建筑》
北大核心
2017年第12期82-84,共3页
Railway Engineering
基金
长江学者和创新团队发展计划(IRT_15R29)
中国铁路总公司科技研究开发计划(Z2015-G001)
关键词
无砟轨道
膨胀量计算公式
试验研究
膨胀土
土样厚度
含水率
indoor unloaded expansion tests
remolded mudstone
different soil
thicknesses
different water
