崔宏环;王伟浩;邵博源;王小敬;闫利;朱超杰;

• 1:河北省土木工程诊断改造与抗灾重点试验室
• 2:河北建筑工程学院土木工程学院
• 3:北旺集团有限公司

摘要(Abstract)：

针对季冻区高铁路基冻胀融沉问题及高铁安全运营的高要求，利用水泥和粉煤灰改良路基的填料，并通过自制冻融试验装置模拟填料的冻胀融沉条件，研究改良粗颗粒填料在冻胀融沉过程中的温度变化、冻胀率和融沉系数的规律，并评价改良填料的适用性。结果表明：在冻融温度变化过程中，水泥改良填料和水泥-粉煤灰改良填料均有减小填料导热和冻深的能力，且粉煤灰会小幅提升水泥填料的导热能力；改良填料在任一个冻融循环和冻胀阶段条件下的冻胀率均小于相同条件下的未改良填料；冻融循环对水泥-粉煤灰填料在慢降阶段的融沉作用影响较大；水泥填料在各阶段的融沉作用受第二次冻融循环影响较大；两种改良粗颗粒填料均有适用性，且添加5%水泥的改良填料最优。

关键词(KeyWords)： 安全工程;高铁路基;改良粗颗粒填料;温度变化;冻胀率;融沉系数

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51878242);; 河北省教育厅重点项目(ZD2020325);; 河北建筑工程学院创新基金项目(XY202012)

作者(Authors): 崔宏环;王伟浩;邵博源;王小敬;闫利;朱超杰;

DOI: 10.13637/j.issn.1009-6094.2020.1639

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