Dynamic and static compaction methods deriving different strain evolutions under cyclic loading for silt and its microscopic interpretation

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-09-18 DOI:10.1016/j.trgeo.2024.101378
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Abstract

To satisfy the economic requirements and reduce the impact to the surrounding buildings and underground structures, the dynamic compaction (heavy tamping) and static compaction are combined used in the soil filling for airport subgrade. Despite compaction the subgrades in the same degree of compaction, the subgrades filled by dynamic and static compaction method show different increase potential in the permanent strain under cyclic loading, which then further result in the differential settlement and safety problems. This study firstly investigated the compaction characteristics under static compaction and different dynamic compaction scheme, during which the static and dynamic compaction strain and stress evolutions were monitored. The cyclic triaxial tests were then performed to investigate the sample preparation method derived difference in permanent strain under cyclic loading. Furthermore, to provide a microscopic interpretation to this difference, the pore size distributions of the silt samples based on mercury intrusion porosimetry (MIP) test and the internal particle contact stresses from discrete element method (DEM) simulation were respectively explored. The main conclusions are as follows: (1) The dynamic compaction processes can be divided into rapid and slow compaction strain stages determined by strain growth rate and compaction numbers, which further influences the homogeneity of soil samples; (2) The statically compacted samples have more significant permanent strain than the dynamic ones due to the localized stress concentration and different pore microstructures; the permanent strain increases with dynamic compaction energy until a stable stage is reached. (3) The MIP results show that the dynamic compaction transforms the macropores into mesopores; the higher compaction energy enhances this transforming effect but results in a decrease in the overall homogeneity.

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动态和静态压实法得出淤泥在循环加载下的不同应变演变及其微观解释
为了满足经济性要求,减少对周围建筑物和地下结构的影响,在机场路基土填筑中采用了动态压实(重型夯实)和静态压实相结合的方法。尽管压实度相同,但采用动态压实和静态压实方法填筑的基层在循环荷载作用下永久应变的增加潜力不同,进而导致不同的沉降和安全问题。本研究首先研究了静态压实和不同动态压实方案下的压实特性,监测了静态和动态压实应变和应力的变化。然后进行了循环三轴试验,以研究样品制备方法导致的循环加载下永久应变的差异。此外,为了从微观上解释这种差异,还分别探讨了基于汞侵入孔隙模拟(MIP)试验的淤泥样品孔径分布和离散元法(DEM)模拟的内部颗粒接触应力。主要结论如下(1)动态压实过程可分为快速压实应变阶段和慢速压实应变阶段,由应变增长率和压实次数决定,这进一步影响了土样的均匀性;(2)由于局部应力集中和孔隙微结构不同,静态压实土样比动态压实土样具有更显著的永久应变;永久应变随动态压实能量的增加而增加,直至达到稳定阶段。(3) MIP 结果表明,动态压实将大孔隙转化为中孔隙;压实能量越高,这种转化效果越强,但会导致整体均匀性下降。
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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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