БАРЬЕРНОЕ ВЛИЯНИЕ МОДИФИЦИРОВАННОЙ ПОДУШКИ НА РАЗВИТИЕ ЗАСОЛЕННОСТИ ОСНОВАНИЯ ВЕЛИКОЙ КИТАЙСКОЙ СТЕНЫ Barrier effect of modified cushion on salinity deterioration in basal sapping zone of earthen sites

Kai Cui, Donghua Wang, Xinyue An, Li Yu, Guopeng Wu

Аннотация


В статье раскрывается механизм барьерного воздействия "естественного оранжевого слоя почвы" в основании Великой Китайской стены на образование засоленности. Разработан и испытан модифицированный материал "подушки", улучшающей известковый грунт путём добавления модифицированного поливинилового спирта в качестве цементирующего агента и золы. Проведены испытания этого материала на циклическое замораживание-оттаивание и изменение температуры и влажности. Выполнены полевые испытания уплотнения базальной зоны реставрации с модифицированной подушкой и без неё. В результате анализа сделаны выводы: природный оранжевый слой грунта, залегающий в основании, имеет гранулометрический состав частиц и распределение пор, которые не способствуют подъёму капиллярной воды, что является основной причиной отсутствия эрозии нижней части участка Великой Китайской стены в округе Хуанчжун. Модифицированный поливиниловый спирт в качестве цементирующего агента, оказывает хорошее влияние на улучшение морозостойкости и долговечности материалов подушки.


Литература


Z. X. Li, L. Y. Zhao, and M. L. Sun, "Deterioration of earthen sites and consolidation with PS material along Silk Road of China," Chinese Journal of Rock Mechanics and Engineering, 28(5), 1047–1054 (2009).

Z. X. Li, X. D. Wang, M. L. Sun, W. W. Chen, Q. L. Guo, and H. Y. Zhang, "Conservation of Jiaohe ancient earthen site in China," J. Rock Mech. Geotech. Eng., 3 (3), 270–281 (2011).

Q. L. Wu, P. Z. Zhang, H. P. Zhang, Y. M. Lin, and Z. Q. Zhang, "A palaeo-earthquake induced damming and bursting of Yellow River and the abnormal flood that destroyed Lajia relic," Sci China Ser D-Earth Sci., 39 (8), 1148–1159 (2009).

M. S. Shao, L. Li, S. J. Wang, E. Z. Wang, and Z. X. Li, "Deterioration mechanisms of building materials of Jiaohe ruins in China," J. Cult. Herit., 14 (1), 38–44 (2013).

Y. M. Du, W. W. Chen, K. Cui, S. Y. Gong, T. B. Pu , and X. L. Fu, "A Model Characterizing Deterioration at Earthen Sites of the Ming Great Wall in Qinghai Province, China," Soil Mech. Found. Eng., 53 (6), 426–434 (2017).

K. Cui, W. W. Chen, L. Han, X. D. Wang, and W. F. Han, "Effects of salinized deterioration and aeolian ullage on soils in undercutting area of earthen ruins in arid region," Chin. J. Geotech. Eng., 33 (9), 1412–1418 (2011).

K. Cui, W. W. Chen, J. Kuang, X. D. Wang, and W. F. Han, "Effect of deterioration of earthern ruin with joint function of salinized and alternating wet and dry in arid and semi-arid regions," Journal of Central South University (Science and Technology), 43 (6), 2378–2384 (2012).

B. Dong, X. F. Zhang, X. Li, and D. Q. Zhang, "Comprehensive tests on rising height of capillary water," Chin. J. Geotech. Eng., 30 (10), 1569–1574 (2008).

H. Y. Zhao, Z. X. Li, W. F. Han, X. D. Wang, and W. W. Chen, "Main diseases and their causes of earthen ruins in region of Northwest China," Chinese Journal of Rock Mechanics and Engineering, 22 (S2), 2875–2880 (2003).

D. Q. Kong, and R. Wang, "The Research of Quality Evaluated Methods of Lime-Soil Foundation in Loess Region of Northwest China," 2008 International Conference on Information Management, Innovation Management and Industrial Engineering, (2008).

H. Z. Mi, J. M. Huang, and Y. N. Hu, "Experiment on constitutive relation and strength properties of three-to-seven lime-loess," Journal of architecture and civil engineering, 31 (2), 112–118 (2014).

W. Chen, Y. Zhang, J. Zhang, and P. Dai, "Consolidation effect of composite materials on earthen sites," Constr. Build. Mater., 187, 730–737 (2018).

K. Cui, G. Wu, Y. Du, X. An, and Z. Wang, "The coupling effects of freeze-thaw cycles and salinization due to snowfall on the rammed earth used in historical freeze-thaw cycles relics in northwest China," Cold Regions Science and Technology, 160, 288–299 (2019).

W. W. Chen, Q. Y. Zhang, H. W. Liu, and Z. Q. Guo, "Feasibility of protecting earthen sites by infiltration of modified polyvinyl alcohol," Constr. Build. Mater., 204, 410–418 (2019).

M. Li, S. Chai, H. Zhang, H. Du, and L. Wei, "Feasibility of reinforced saline soil with treated wheat straw and lime," Soil Foundations, 52 (2), 231–241 (2012).

GB/T 50123-1999. Standard for soil test method, China National Standard (1999).

GB/T 17671-1999, Method of testing cements-Determination of strength, China National Standard (1999).

WW/T 0039-2012, Testing techniques specifications for preservation of earthen sites, China Professional Standard (2012).

M. I. Gomes, P. Faria, and T. D. Gonçalves, "Rammed earth walls repair by earth-based mortars: The adequacy to assess effectiveness," Constr. Build. Mater., 205, 213–231 (2019).

J. Zhang, W. Chen, Z. Li, X. Wang, Q. Guo, and N. Wang, "Study on workability and durability of calcined ginger nuts-based grouts used in anchoring conservation of earthen sites," Journal of Cultural Heritage, 16 (6), 831–837 (2015).

M. M. Chen, "Intensity deterioration factor and regulation's study on earthern sites undergoing rainfall in arid and semi-arid regions," M.Sc. thesis, Lanzhou University of Technology, Lanzhou, China (2017).

Y. X. Shen, "Salt weathering mechanism of ancient earthen material in arid area of Northwest China: a case study of Na2SO4-NaCl salt mixtures," PhD thesis, Lanzhou University, Lanzhou, China (2017).

Y. M. Wang, Z. C. Yang, W. W. Chen, and W. F. Han, "Strength characteristics and mechanism of loess solidified with new polymer material SH," Chinese Journal of Rock Mechanics and Engineering, 24 (14), 2554–2559 (2005).


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