细土/粗土混合物力学行为的实验研究与建模

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-09-20 DOI:10.1016/j.trgeo.2024.101382
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引用次数: 0

摘要

在列车循环的作用下,由于道碴颗粒和路基细料之间的相互渗透,在传统的铁轨上形成了一层夹层。考虑到夹层具有较高的承载能力,在铁路轨道的更新计划中一直保留着这种夹层。本研究对这种细/粗土混合物的力学行为进行了实验探索和理论建模。结果表明(i) 混合物的土壤-水分保持曲线(SWRC)只与细土的干密度 ρd-f 有关,而与粗粒含量 fv 无关;(ii) 混合物的两种不同结构可通过特征 fv-cha 值区分:当 fv < fv-cha 时为细基质大结构,当 fv > fv-cha 时为粗粒为主的结构;(iii) 含水量的增加引起永久应变 ε1p 的增长,由于吸力 ψ 的下降引起弹性模量 Mr 的下降,但由于土壤粘度的增加引起阻尼比 Dr 的增长;(iv) 结合 SWRC 为 ε1p 建立了一个构成模型,可以考虑加载循环次数 N、偏差应力 σd 和 fv 的影响。考虑到 σd、ψ 和 fv 的影响,还为 Mr 提出了一个构成模型。
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Experimental investigation and modelling of the mechanical behaviors of fine/coarse soil mixture
An interlayer was formed in the conventional railway track, due to the interpenetration between ballast grains and subgrade fines under the effect of train circulation. Considering the interlayer’s high bearing capacity, it has been remained in the railway track in its renewal program. In present study, the mechanical behaviors of such fine/coarse soil mixture were experimentally explored and theoretically modeled. Results show that: (i) the soil–water retention curve (SWRC) of mixture was solely related to the dry density of fine soil ρd-f, while independent of the coarse grain content fv; (ii) two various fabrics of mixture were distinguished by a characteristic fv-cha value: a fine matrix macrostructure when fv < fv-cha and a coarse grain dominated fabric when fv > fv-cha; (iii) an increasing water content induced the growth of permanent strain ε1p and a decline of resilient modulus Mr due to the decline of suction ψ, but the growth of damping ratio Dr due to the rise of soil viscosity; (iv) a constitutive model was developed for the ε1p by incorporating the SWRC, which allows the influences of the number of loading cycles N, deviator stress σd and fv to be considered. A constitutive model was also proposed for the Mr, taking the influences of σd,ψ and fv into account.
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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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