Full Text:   <284>

CLC number: TU433

On-line Access: 2019-12-09

Received: 2019-06-21

Revision Accepted: 2019-11-06

Crosschecked: 2019-11-26

Cited: 0

Clicked: 520

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Qing-yi Mu

https://orcid.org/0000-0002-9235-4978

Chao Zhou

https://orcid.org/0000-0002-9443-6707

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.12 P.979-990

http://doi.org/10.1631/jzus.A1900274


Effects of clay content on the volumetric behavior of loess under heating-cooling cycles


Author(s):  Qing-yi Mu, Charles Wang-wai Ng, Chao Zhou, Gordon Gong-dan Zhou

Affiliation(s):  Department of Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China; more

Corresponding email(s):   c.zhou@polyu.edu.hk

Key Words:  Loess, Volumetric behavior, Clay mineral, Heating-cooling cycles


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Qing-yi Mu, Charles Wang-wai Ng, Chao Zhou, Gordon Gong-dan Zhou. Effects of clay content on the volumetric behavior of loess under heating-cooling cycles[J]. Journal of Zhejiang University Science A, 2019, 20(12): 979-990.

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DOI - 10.1631/jzus.A1900274


Abstract: 
Although numerous studies have been carried out on investigating thermal volume changes in different soils, limited attention has been paid to loess. This study aims to investigate the effects of clay content on the deformation of loess under heating-cooling cycles. Three soils with different clay contents (i.e. SA: 7%; SB: 13%; SC: 35%) were prepared with loess collected in situ through the sedimentation method. The soil volume changes were measured under heating-cooling cycles by using a thermal invar oedometer. To interpret the experimental results, X-ray diffraction (XRD) and scanning electron microscope (SEM) tests were conducted to identify the composition and microstructure of tested soils, respectively. The results show that the plastic axial strains of SA, SB, and SC accumulate to a certain level with the increasing number of heating-cooling cycles. At the stable state, the plastic axial strain of SC is 264% and 52% larger than those of SA and SB, respectively. On the other hand, the linear thermal expansion coefficient of SC is 66% and 20% larger than those of SA and SB, respectively. As evidenced from the XRD test, the clay in loess mainly contains kaolinite, chlorite, and illite, while the composition of silt is dominated by quartz. The clay minerals are more sensitive to thermal fluctuations than quartz because of the electrical double layer. SC, whose clay content is deliberately enhanced, exhibits a larger plastic axial strain and linear thermal expansion coefficient than do SA and SB.

The paper presents the results of a laboratory investigation of the amount of clay content on the cyclic thermal expansion characteristics of loess. Three soil samples were tested with varying amount of clay content. The study concludes that higher clay content results in larger thermal expansion and higher coefficient of thermal expansion.

循环温度荷载下黏粒含量对黄土变形特性的影响

目的:1. 探讨加热-降温循环温度荷载下黄土中黏土矿物对其变形特性的影响,包括累积塑性压缩变形和热膨胀系数. 2. 研究黄土由于施加温度荷载产生变形的微观机理.
创新点:1. 明确了对黄土由温度荷载引起累积塑性变形具有重要影响的矿物成分; 2. 研究得到黄土由于施加温度荷载产生变形的微观机理.
方法:1. 通过溶液沉积法,分离黄土中的黏土矿物,并制备出三种不同黏土矿物含量的黄土测试样品; 2. 通过温控一维固结仪,测试不同黏土矿物含量的黄土在循环温度荷载下的累积塑性变形和热膨胀系数; 3. 通过扫描电镜试验和矿物成分测试,研究黄土由于施加温度荷载产生变形的微观机理.
结论:1. 黄土中所含伊利石、绿泥石、高岭石和蒙脱石等黏土矿物对其由于施加温度荷载所产生的累积塑性变形具有重要影响; 2. 黄土孔隙比对其由温度荷载引起的累积塑性变形和热膨胀系数影响较小.

关键词:黄土; 变形; 黏土矿物; 循环温度荷载

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Abuel-Naga HM, Bergado DT, Bouazza A, et al., 2007. Volume change behaviour of saturated clays under drained heating conditions: experimental results and constitutive modeling. Canadian Geotechnical Journal, 44(8):942-956.

[2]ASTM, 2007. Standard Test Method for Particle-size Analysis of Soils (Withdrawn 2016), ASTM D422-63. National Standards of USA.

[3]ASTM, 2011. Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System), ASTM D2487-11. National Standards of USA.

[4]Burland JB, 1990. On the compressibility and shear strength of natural clays. Géotechnique, 40(3):329-378.

[5]Campanella RG, Mitchell JK, 1968. Influence of temperature variations on soil behavior. Journal of the Soil Mechanics and Foundations Division, 94(3):709-734.

[6]Cekerevac C, Laloui L, 2004. Experimental study of thermal effects on the mechanical behaviour of a clay. International Journal for Numerical and Analytical Methods in Geomechanics, 28(3):209-228.

[7]Cui YF, Nouri A, Chan D, et al., 2016. A new approach to DEM simulation of sand production. Journal of Petroleum Science and Engineering, 147:56-67.

[8]Cui YF, Chan D, Nouri A, 2017. Coupling of solid deformation and pore pressure for undrained deformation—a discrete element method approach. International Journal for Numerical and Analytical Methods in Geomechanics, 41(18):1943-1961.

[9]Dach J, Jager J, 1995. Prediction of gas and temperature with the disposal of pretreated residential waste. Proceedings of the 5th International Landfill Symposium, p.665-677.

[10]Delage P, Sultan N, Cui YJ, 2000. On the thermal consolidation of Boom clay. Canadian Geotechnical Journal, 37(2):343-354.

[11]Di Donna A, Laloui L, 2015. Response of soil subjected to thermal cyclic loading: experimental and constitutive study. Engineering Geology, 190:65-76.

[12]Hueckel T, Baldi G, 1990. Thermoplasticity of saturated clays: experimental constitutive study. Journal of Geotechnical Engineering, 116(12):1778-1796.

[13]Khalili N, Uchaipichat A, Javadi AA, 2010. Skeletal thermal expansion coefficient and thermo-hydro-mechanical constitutive relations for saturated homogeneous porous media. Mechanics of Materials, 42(6):593-598.

[14]Konrad JM, 1990. Unfrozen water as a function of void ratio in a clayey silt. Cold Regions Science and Technology, 18(1):49-55.

[15]Liu XC, Xu WJ, Zhan LT, et al., 2016. Laboratory and numerical study on an enhanced evaporation process in a loess soil column subjected to heating. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 17(7):553-564.

[16]Liu Z, Liu FY, Ma FL, et al., 2016. Collapsibility, composition, and microstructure of loess in China. Canadian Geotechnical Journal, 53(4):673-686.

[17]Lu HJ, Li JX, Wang WW, et al., 2015. Cracking and water seepage of Xiashu loess used as landfill cover under wetting-drying cycles. Environmental Earth Sciences, 74(11):7441-7450.

[18]Mu QY, Ng CWW, Zhou C, et al., 2018. A new model for capturing void ratio-dependent unfrozen water characteristics curves. Computers and Geotechnics, 101:95-99.

[19]Mu QY, Zhou C, Ng CWW, et al., 2019. Stress effects on the soil freezing characteristic curve under freezing and thawing: equipment development and experimental results. Vadose Zone Journal, 18:180199.

[20]Ng CWW, Zhou C, 2014. Cyclic behaviour of an unsaturated silt at various suctions and temperatures. Géotechnique, 64(9):709-720.

[21]Ng CWW, Wang SH, Zhou C, 2016. Volume change behaviour of saturated sand under thermal cycles. Géotechnique Letters, 6(2):124-131.

[22]Ng CWW, Mu QY, Zhou C, 2017a. Effects of boundary conditions on cyclic thermal strains of clay and sand. Géotechnique Letters, 7(1):73-78.

[23]Ng CWW, Mu QY, Zhou C, 2017b. Effects of soil structure on the shear behaviour of an unsaturated loess at different suctions and temperatures. Canadian Geotechnical Journal, 54(2):270-279.

[24]Ng CWW, Mu QY, Zhou C, 2019a. Effects of specimen preparation method on the volume change of clay under cyclic thermal loads. Géotechnique, 69(2):146-150.

[25]Ng CWW, Chen R, Coo JL, et al., 2019b. A novel vegetated three-layer landfill cover system using recycled construction wastes without geomembrane. Canadian Geotechnical Journal, 56(12):1863-1875.

[26]Romero E, Gens A, Lloret A, 2003. Suction effects on a compacted clay under non-isothermal conditions. Géotechnique, 53(1):65-81.

[27]Southen JM, Rowe RK, 2005. Laboratory investigation of geosynthetic clay liner desiccation in a composite liner subjected to thermal gradients. Journal of Geotechnical and Geoenvironmental Engineering, 131(7):925-935.

[28]Tu XB, Kwong AKL, Dai FC, et al., 2009. Field monitoring of rainfall infiltration in a loess slope and analysis of failure mechanism of rainfall-induced landslides. Engineering Geology, 105(1-2):134-150.

[29]van Dijk B, 2018. Design of suction foundations. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 19(8):579-599.

[30]Vega A, McCartney JS, 2015. Cyclic heating effects on thermal volume change of silt. Environmental Geotechnics, 2(5):257-268.

[31]Wang XL, Zhu YP, Huang XF, 2014. Field tests on deformation property of self-weight collapsible loess with large thickness. International Journal of Geomechanics, 14(3):04014001.

[32]Zhan LT, Qiu QW, Xu WJ, et al., 2016. Field measurement of gas permeability of compacted loess used as an earthen final cover for a municipal solid waste landfill. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 17(7):541-552.

[33]Zhan LT, Li GY, Jiao WG, et al., 2017. Field measurements of water storage capacity in a loess–gravel capillary barrier cover using rainfall simulation tests. Canadian Geotechnical Journal, 54(11):1523-1536.

[34]Zhou C, Ng CWW, 2018. A new thermo-mechanical model for structured soil. Géotechnique, 68(12):1109-1115.

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