沉管隧道碎石垫层力学行为与变形特性试验研究(英文)
发布时间:2022-01-13 11:56
目的:目前国内外尚无采用二片石+碎石作为沉管隧道先铺法垫层的先例,且二片石+碎石组合垫层的力学变形特性尚不明确。本文旨在通过室内物理力学模型试验,定量分析二片石及碎石垫层铺设厚度、级配、落管预压荷载量等因素的影响,提出碎石垫层构造方案以及相应的变形模量和承载力等力学指标,以合理确定垫层厚度及可行的施工工艺、准确评估地基刚度偏差、降低淤泥对碎石垫层承载性能的影响以及保证沉管结构的受力安全。创新点:1.提出二片石+碎石组合垫层的力学变形特性;2.提出落管预压荷载的作用以及对垫层性质的影响。方法:1.分别开展二片石和碎石的室内物理力学模型试验,研究二片石与碎石接触面的平整度、颗粒级配、落管预压荷载以及垫层厚度对垫层的物理力学性质的影响,并在此基础上开展二片石+碎石组合垫层的室内模型试验;2.提出碎石垫层构造方案以及相应的变形模量和承载力等力学指标,以提高沉管结构的受力安全。结论:1.在设计荷载作用下,二片石垫层的荷载-位移曲线呈现越压越密的非线性受力特点,而碎石垫层和碎石+二片石垫层的荷载-位移曲线呈现两阶段线性变化;2.二片石垫层顶部的平整密实度对其沉降和压缩模量有很大的影响,因此在施工时...
【文章来源】:Journal of Zhejiang University-Science A(Applied Physics & Engineering). 2020,21(07)EISCICSCD
【文章页数】:11 页
【文章目录】:
1 Introduction
2 Experiment
2.1 Experimental device
2.2 Experimental method
2.2.1 Conditions
2.2.2 Loading process
2.3 Experimental procedure
3 Secant modulus calculation method
4 Experimental results and analysis
4.1 Flaky stone experiment
4.1.1 Basic working conditions
4.1.2 Influence of loading surface
4.1.3 Influence of preloading pressure
4.1.4 Influence of flaky stone particle size
4.2 Gravel experiment
4.3 Flaky stone and gravel combination cushion experiment
5 Conclusions
Contributors
Conflict of interest
本文编号:3586378
【文章来源】:Journal of Zhejiang University-Science A(Applied Physics & Engineering). 2020,21(07)EISCICSCD
【文章页数】:11 页
【文章目录】:
1 Introduction
2 Experiment
2.1 Experimental device
2.2 Experimental method
2.2.1 Conditions
2.2.2 Loading process
2.3 Experimental procedure
3 Secant modulus calculation method
4 Experimental results and analysis
4.1 Flaky stone experiment
4.1.1 Basic working conditions
4.1.2 Influence of loading surface
4.1.3 Influence of preloading pressure
4.1.4 Influence of flaky stone particle size
4.2 Gravel experiment
4.3 Flaky stone and gravel combination cushion experiment
5 Conclusions
Contributors
Conflict of interest
本文编号:3586378
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