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轻量土击实密度模型与工程特性

侯天顺

侯天顺. 轻量土击实密度模型与工程特性[J]. 岩土工程学报, 2014, 36(11): 2127-2135. DOI: 10.11779/CJGE201411020
引用本文: 侯天顺. 轻量土击实密度模型与工程特性[J]. 岩土工程学报, 2014, 36(11): 2127-2135. DOI: 10.11779/CJGE201411020
shu
HOU Tian-shun. Model for compaction density and engineering properties of light weight soil[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(11): 2127-2135. DOI: 10.11779/CJGE201411020
Citation: HOU Tian-shun. Model for compaction density and engineering properties of light weight soil[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(11): 2127-2135. DOI: 10.11779/CJGE201411020
shu

轻量土击实密度模型与工程特性  English Version

  • 西北农林科技大学水利与建筑工程学院,陕西 杨凌 712100

Model for compaction density and engineering properties of light weight soil

  • College of Water Resources and Architectural Engineering, Northwest A&
    F University, Yangling 712100, Shaanxi, China

Funds: Project (2012JQ7013) supported by Natural Science Foundation of Shaanxi Province; Project (Z109021108) supported by Special Matching Funds of Shaanxi Province; Project (QN2012025) supported by the Fundamental Research Funds for the Central Universities; PhD project (2011BSJJ084) supported by Research Foundation of Northwest A&F University

摘要

    摘要
  • 摘要: 为了探索软夹杂土体压实机理,指导轻量土配方设计与压实施工,基于混合土物质结构组成及土体压缩变密的物理本质,建立了击实密度模型。试验发现模型预测值与实测湿密度基本一致,绝对误差仅有0.003~0.051 g/cm3,相对误差仅有0.282%~5.267%,证明击实密度模型可以准确预测混合土不同击实条件下的湿密度。EPS颗粒压缩率、混合土湿密度随击实次数增大而增大,增大趋势逐渐变缓;混合土孔隙比随击实次数增大而减小。在击实作用下,轻量土湿密度的提高是由土体的孔隙减少和EPS颗粒软夹杂的塑性压缩共同完成的。与砂土轻量土性质相似,粘土轻量土的湿密度、无侧限抗压强度随击实次数增大而增大。=25击时,EPS颗粒压缩率范围6.13%~11.51%;=94击时,EPS颗粒压缩率范围12.80%~14.87%。证明规范规定的击实次数与击实能量适合混合土的击实,不会导致EPS颗粒消泡。考虑到击实密度模型参数测定非常繁琐,根据工程实际情况,假设压实过程中土料含水量不变与压实后土颗粒-EPS颗粒之间的孔隙近似为0,进一步提出了简化击实密度模型,并且通过试验证明了简化模型完全适用于实际工程。
    Abstract: In order to study the compaction mechanism of soft inclusion soil, and to guide the prescription design and compaction construction of light weight soil, a model for compaction density is established based on material composition and the physical essence of soil compaction. It is found that the predicted value is nearly close to the measured wet density. The absolute error is only 0.003~0.051 g/cm3, and the relative error is only 0.282%~5.267%. It is proved that the model for compaction density can predict exactly the wet density of mixed soil under different compaction conditions. The compression ratio of EPS beads and the wet density of mixed soil increase with the increase of compaction times, and the increase trend becomes slow gradually, and the void ratio of mixed soil decreases with the increase of compaction times. Under compaction conditions, the increase of wet density of light weight soil is accomplished by both the deceasing pore of soil and the plastic compression of EPS beads soft inclusion. Being similar to those of light weight soil with sand, the wet density and unconfined compressive strength of light weight soil with clay increase with the increasing compaction times. When compaction time =25, the compression ratio range of EPS beads is 6.13%~11.51%; when =94, the compression ratio range is 12.80%~14.87%. It is proved that the compaction times and energy which the standard specifies are fit for the compaction of mixed soil, and will not destroy the EPS beads. Considering that the measuring process of the parameters for the model for compaction density is complex, according to the practical engineering situation, it is supposed that the water content keeps the same during the compaction process, and the holes between soil and EPS beads after compaction are close to 0. The simplified model for compaction density is put forward, and the fact that the simplified model can be fit for the practical projects completely is proved.
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    • 参考文献(17)
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出版历程
  • 收稿日期:  2013-11-15
  • 发布日期:  2014-11-19

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