黏土基泡沫聚合土路基材料的保温性能及力学特性
收稿日期: 2024-01-04
修回日期: 2024-06-04
网络出版日期: 2024-06-24
基金资助
国家自然科学基金（42077262，42077261）、湖北省创新群体项目（2023AFA019）、湖北省交通运输厅科技项目（2020-186-1-9）、2022年度交通运输行业科技项目（2022-ZD-017，2022-ZD-018）和新疆交通设计院科研基金（KY2022042504，KY2022042501，KY2023081601）资助
Thermal insulation performance and mechanical characteristics of clay-based foamed polymeric soil subgrade materials
Received date: 2024-01-04
Revised date: 2024-06-04
Online published: 2024-06-24
以乌鲁木齐绕城高速沿线的挖方弃土为基础，结合水泥和泡沫，共同研发具有多孔保温特性的泡沫聚合土。系统探讨湿密度、土壤掺量和水料比对泡沫聚合土导热性能、无侧限抗压强度和刚度的影响，建立孔隙结构与宏观性能之间的内在联系。研究结果表明，当泡沫聚合土的密度从600 kg/m3提升至1 200 kg/m3时，其导热系数增长约1倍，强度增强约3.95倍，模量更是增长约10.5倍。相较于传统的路基土，泡沫聚合土的导热系数显著降低52%~96.4%。进一步对孔隙结构进行分析，发现随着单位体积内泡沫聚合土孔径的减小，骨架占比相应增加，气孔体积则有所减少。这种细观结构的变化在宏观性能上表现为保温性能的提升（即导热系数的降低）以及力学性能的显著增强（包括强度和刚度的提升）。泡沫聚合土不仅展现出较好的保温性能，还具备较强的力学特性，为季冻区路基的防寒保温层提供了合适的解决方案。
赵阳 , 卢正 , 刘杰 , 张荣 , 颜廷舟 , 唐楚轩 , 李剑 . 黏土基泡沫聚合土路基材料的保温性能及力学特性[J]. 中国科学院大学学报, 2026 , 43(1) : 51 -60 . DOI: 10.7523/j.ucas.2024.062
The use of excavated soil from highway construction sites to produce foamed polymeric soil， employed as a thermal insulation layer for seasonally frozen subgrades， not only achieves comprehensive resource utilization but also mitigates frost damage to the subgrades. Based on the excavated soil along the Urumqi Ring Expressway， combined with cement and foam， the foamed polymeric soil with porous insulation properties was developed. The influences of wet density， soil admixture， and water-cement ratio on the thermal conductivity， unconfined compressive strength， and stiffness of foamed polymeric soil were systematically investigated， establishing an intrinsic connection between pore structure and macroscopic performance. The research findings indicate that when the density of foamed polymeric soil increases from 600 kg/m³ to 1 200 kg/m³， its thermal conductivity approximately doubles， strength increases by about 3.95 times， and modulus increases by approximately 10.5 times. Compared to traditional subgrade soil， the thermal conductivity of foamed polymeric soil is significantly reduced by 52%-96.4%. Further analysis of the pore structure reveals that as the pore size of foamed polymeric soil within a unit volume decreases， the proportion of the skeleton increases correspondingly， while the volume of air pores decreases. This microstructural change manifests as improved thermal insulation performance （i.e.， reduced thermal conductivity） and significant enhancement in mechanical properties （including strength and stiffness） at the macroscopic level. Foamed polymeric soil not only demonstrates better thermal insulation performance but also exhibits strong mechanical characteristics， providing a suitable solution for the thermal insulation layer of seasonally frozen subgrades.
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