真空热固结联合强夯处理工程废浆试验研究
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1.江西理工大学土木与测绘工程学院;2.江西省环境岩土与工程灾害重点实验室;3.温州大学建筑与土木工程学院;4.浙江省软弱土地基与海涂围垦工程技术重点实验室

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国家自然科学基金项目(51878512 ,52178348 )


Experimental study of engineering waste slurry treatment by vacuum thermal consolidation combined with dynamic compaction
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1.College of Civil and Surveying Engineering, Jiangxi University of science and technology;2.School of Civil Engineering and Architecture, Wenzhou University

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    摘要:

    为解决真空热固结过程中热量与真空负压在土体中衰减,而导致土体加固效果不均匀的问题,利用强夯法能改善土体密实度的特性,将真空热固结法与强夯法联合应用于工程废浆的加固处理中。通过四组室内模型试验,研究了不同夯击时机对土体加固效果的影响。结果表明:在沉降速率为4cm/3d时为最佳夯击时机,土体表面平均沉降比其他试验组提高26.5%、11.72%和3.74%,对工程废泥浆的处理效果最佳,能有效的解决真空热固结下深层土体加固效果差的问题,并提高土体的均匀性。通过微观结构分析发现,合适的强夯时机下,由于土颗粒之间的孔隙重分布,导致土体密实程度更高,十字板剪切强度随之增加。此外,内部孔隙重分布产生微裂缝形成的排水通道对排水有一定的促进作用,进一步提升了固结效果。所以在合适的夯击时机下,对土体的十字板剪切强度与固结度均有促进作用。

    Abstract:

    In order to solve the problem that heat and vacuum negative pressure decrease in soil which leads to uneven reinforcement effect during vacuum thermal consolidation, the vacuum thermal consolidation combined dynamic compaction method is applied in the reinforcement treatment of engineering waste slurry utilize the characteristics of soil compaction can be improved by dynamic compaction method. The influence of different tamping time on the reinforcement effect of soil was studied by conducting four groups of model tests.. The results show that when the settlement rate is 4cm/3d, the tamping time is the best, the average settlement of soil surface is 26.5%, 11.72% and 3.74% higher than that of other test, and the treatment effect of engineering waste slurry is the best, which can effectively solve the poor reinforcement effect of deep soil under vacuum thermal consolidation and improve the uniformity of soil. Combined with the results of microstructure analysis, it can be found that due to the redistribution of pores between soil particles, the soil density is higher, and the shear strength increases accordingly under the appropriately tamping time. In addition, the drainage channels formed by the micro-cracks generated by the redistribution of internal pores can promote drainage and further improve the consolidation effect.Therefore, the shear strength and consolidation degree of the soil can be promoted under the appropriate tamping time.

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  • 收稿日期:2022-07-21
  • 最后修改日期:2022-08-26
  • 录用日期:2022-09-16
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