The Quantification of Micro-structural Damage of Weak Muddy Intercalation in Dry-wet Cycles Combining in-situ SEM and DIP

Abstract

In order to reflect truly the damage evolution mechanism of weak muddy intercalation in dry-wet cycles, two typical weak muddy intercalations were selected for dry-wet cycles. The mineral changes of specimens were analyzed via X-ray diffraction after dry-wet cycles. By combining in-situ SEM and digital image processing (DIP), the damage evolution process and damage characteristic parameters of each stage were obtained. The experimental results indicate that the hydration and dissolution of minerals can not be a determinant factor in structure damage. The micro-structural damage is due to disintegration of mineral aggregates, leading to changes in the number and size of cracks and pores. The damage degree of specimens is related to its initial structure, and the micro-structural damage intensifies and finally tends to stabilize with cycle times increased.

Keywords

dry-wet cycles / weak muddy intercalation / in-situ SEM / digital image processing / microstructural damage

References

[1] Hama K, Bateman K, Coombs P, et al. Influence of Bacteria on Rock-water Interaction and Clay Mineral Formation in Subsurface Granitic Environments[J]. Clay Minerals, 2001, 36(4): 599-613.

[2] Sou-ding I, Xiao LI, Nian-xue Z, et al. Water-rock Interaction of Clay Gouged Intercalation Sludging Process of Baota Landslides in Three Gorges Reservoir Area[J]. Rock and Soil Mechanics, 2006, 27(10): 1 841-1 846.

[3] Iverson RM. Landslide Triggering by Rain Infiltration[J]. Water Resources Research, 2000, 36(7): 1 897-1 910.

[4] Yalcin A. The Effects of Clay on Landslides: A Case Study[J]. Applied Clay Science, 2007, 38(1-2): 77-85.

[5] Jiang J, Xiang W, Rohn J, et al. Research on Water-rock (soil) Interaction by Dynamic Tracing Method for Huangtupo Landslide, Three Gorges Reservoir, PR China[J]. Environmental Earth Sciences, 2015, 74(1): 557-571.

[6] Cokca E, Erol O, Armangil F. Effects of Compaction Moisture Content on the Shear Strength of An Unsaturated Clay[J]. Geotechnical & Geological Engineering, 2004, 22(2): 285-297.

[7] Rayhani MHT, Yanful EK, Fakher A. Desiccation-induced Cracking and Its Effect on the Hydraulic Conductivity of Clayey Soils from Iran[J]. Canadian Geotechnical Journal, 2007, 44(3): 276-283.

[8] Rayhani MHT, Yanful EK, Fakher A. Physical Modeling of Desiccation Cracking in Plastic Soils[J]. Engineering Geology, 2008, 97: 25-31.

[9] Basma Ai-homound AS, Hudein Malkawia I, et al. Swelling-shrinkage Behavior of Natural Expansive Clays[J]. Applied Clay Science, 1996 211-227.

[10] Jiamin B. Direct Shear Test on Strength of Weak Expansive Soil under Dry-wet Cycles[J]. Journal of Yangtze River Scientific Research Institute, 2018

[11] Liu X, Li D, Wang Z, et al. The Effect of Dry-wet Cycles with Acidic Wetting Fluid on Strength Deterioration of Shaly Sandstone[J]. Chinese Journal of Rock Mechanics and Engineering, 2016

[12] Liang H, Wang Y, Zhou T P, et al. Dry and Wet Cycle Tri-axial Test Research of Silt[J]. Applied Mechanics and Materials, 2011 90-93.

[13] Zuo C, Liu D, Ding S, et al. Micro-characteristics of Strength Reduction of Tuff Residual Soil with Different Moisture[J]. KSCE Journal of Civil Engineering, 2016, 20(2): 639-646.

[14] Hu Q, Cai Q, He L, et al. Novel Method to Determine the Image Segmentation Threshold during the Quantitative Test on Meso-structure of Geo-material[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2017, 32(6): 1 408-1 412.

[15] Hu Q, Shi R, Yang X, et al. Mesomechanics Finite-element Method for Determining the Shear Strength of Mudded Intercalation Materials[J]. Journal of Wuhan University of Technology-Mater. Sci. Ed., 2017, 32(2): 289-291.

[16] Liu Y, Lei S, Li Y, et al. Influence of Replacement Level of Coal-series Kaolin on Hydration of Ordinary Portland Cement by X-ray Diffraction/Rietveld Method[J]. Journal of Wuhan University of Technology- Mater. Sci. Ed, 2019, 34(3): 614-621.

[17] Liu X, Yuan W, Fu Y, et al. Porosity Evolution of Sandstone Dissolution under Wetting and Drying Cycles[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(3): 527-532.