Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (10): 2860-2870.doi: 10.16285/j.rsm.2023.0798

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

CT-based mesoscopic structural characteristics of compacted silty clay under wetting-drying cycles sequentially coupled with dynamic loadings

HU Zhi1, 2, LI Zhi-chao3, LI Li-hua2, YAN Xin1, ZHAN Wei1   

  1. 1. Key Laboratory for Road and Bridge Detection and Maintenance Technology of Zhejiang Province, Zhejiang Scientific Research Institute of Transport, Hangzhou, Zhejiang 310023, China; 2. School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan, Hubei 430068, China; 3. China Construction Third Bureau First Engineering Co., Ltd., Wuhan, Hubei 430040, China
  • Received:2023-06-13 Accepted:2023-07-24 Online:2023-10-13 Published:2023-10-16
  • Supported by:
    This work was supported by the Zhejiang Provincial Basic Public Welfare Research Project (LGF22E080029) and the National Natural Science Foundation of China (51708190).

PDF (Chinese)

340

Abstract:

This study aims to further reveal the deterioration mechanism of subgrade soil performance under the coupling of multiple factors. On the basis of previous work, CT scanning technology is adopted to analyze the mesoscopic structural characteristics of compacted silty clay under wetting-drying cycles sequentially coupled with dynamic loadings. By examining influences of the coupling effect on the three-dimensional spatial pore distribution, the statistical distribution of pore volume, and the statistical indicators of image grayscale, the relationship between the macroscopic performance and the mesoscopic structural characteristics of specimens is revealed. Results indicate that more large pores and through-cracks would be induced by wetting-drying cycles, while part of pores or cracks caused by wetting-drying cycles can be closed by dynamic loadings. With the sequential coupling of wetting-drying cycles and dynamic loadings, the number of small pores in the specimen tends to increase. Increasing of total pore volume can be caused by wetting-drying cycles, and decreasing of total pore volume can be caused by sequential dynamic loadings. The mesoscopic structural parameters can be used to explain the evolution of macroscopic performance of specimens.

Key words: CT, wetting-drying cycle, dynamic loading, sequential coupling effect, subgrade soil, mesoscopic structure

CLC Number: 

  • TU411
[1] YANG Chun-he, WANG Gui-bin, SHI Xi-lin, ZHU Shi-jie, ZHENG Zhu-yan, LIU Wei, FAN Jin-yang, . Demands and challenges of large-scale salt cavern hydrogen storage in China [J]. Rock and Soil Mechanics, 2024, 45(1): 1-19.
[2] GAO Ming-shi, YU Xin, XU Dong, HE Yong-liang, ZHAO Shi-fan, . Graded support of rock burst roadway based on balance theory of impact energy and absorbed energy [J]. Rock and Soil Mechanics, 2024, 45(1): 38-48.
[3] LI Yu-ping, CHEN Jia-rui, SHI Jian-yong, FAN Bao-yun, . Thermo-mechanical volume change behavior and constitutive model of municipal solid waste [J]. Rock and Soil Mechanics, 2024, 45(1): 49-58.
[4] WU Xiao-feng, ZHANG Di, LI Xing, WANG Yu-bing, WEN Kai, . Lateral deformation prediction model of pile foundation in liquefiable site [J]. Rock and Soil Mechanics, 2024, 45(1): 77-86.
[5] CAI Yong-ming, WANG Zhi-jie, QI Yi-fei, YANG Guang-qing, WANG He, . Experimental study on dynamic properties of geogrid reinforced rubber gravel [J]. Rock and Soil Mechanics, 2024, 45(1): 87-96.
[6] LIU Tian-xiang, ZHU Hong-hu, WU Bing, LI Hao-jie, HU Le-le, . Progressive failure mechanism of embedded strain sensing cable-frozen soil interface [J]. Rock and Soil Mechanics, 2024, 45(1): 131-140.
[7] CUI Xin-zhuang, JIANG Peng, WANG Yi-lin, JIN Qing, CHEN Lu, . On the role of dilatancy induced by high resistance hyperstatic geogrids in coarse-grained soil layer [J]. Rock and Soil Mechanics, 2024, 45(1): 141-152.
[8] LUO Xiao-qian, KONG Ling-wei, YAN Jun-biao, GAO Zhi-ao, TIAN Sheng-kui, . In-situ borehole shear test and shear strength response characteristics of expansive soil under different saturations [J]. Rock and Soil Mechanics, 2024, 45(1): 153-163.
[9] ZHANG Xiao-di, DUAN Bing, WU Jian, WANG Jin-chang, YANG Zhong-xuan, GONG Xiao-nan, XU Rong-qiao, . Analytical approach to axially loaded concrete core-cement soil composite pile [J]. Rock and Soil Mechanics, 2024, 45(1): 173-183.
[10] ZHANG Yu-guo, YANG Wen-bing, ZHAO Ya-chun, WANG Chuang, ZHAO Ya-min. Theoretical study on consolidation of composite foundation with composite piles considering spatiotemporal effect of stress under bidirectional seepage [J]. Rock and Soil Mechanics, 2024, 45(1): 184-196.
[11] MENG Qiu-jie, SONG Yi-xiang, HUANG Da, MA Wen-zhu, ZHONG Zhu, CEN Duo-feng, . Mechanism of shear strength degradation of subglacial debris under thawing [J]. Rock and Soil Mechanics, 2024, 45(1): 197-212.
[12] LEI Hua-yang, BO Yu, MA Chang-yuan, WANG Lei, ZHANG Wei-di, . Variation pattern and prediction model of clay specific heat capacity considering multi-factors [J]. Rock and Soil Mechanics, 2023, 44(增刊): 1-11.
[13] ZHANG Pei-sen, XU Da-qiang, LI Teng-hui, HU Xin, ZHAO Cheng-ye, HOU Ji-qun, NIU Hui, . Experimental study of seepage characteristics before and after grouting and mechanical characteristics after grouting of fractured sandstone [J]. Rock and Soil Mechanics, 2023, 44(增刊): 12-26.
[14] DENG Hua-feng, FENG Yun-jie, LI Jian-lin, WANG Wen-dong, LI Guan-ye, QI Yu, . Quantification study on effective shear zone of matching structural plane based on illumination technology [J]. Rock and Soil Mechanics, 2023, 44(增刊): 63-72.
[15] LUO Guo-li, ZHANG Ke, QI Fei-fei, ZHU Hui, ZHANG Kai, LIU Xiang-hua, . Size effect and anisotropy of mechanical properties of fractured rock masses based on 3D printing [J]. Rock and Soil Mechanics, 2023, 44(增刊): 107-116.
Viewed
Full text


Abstract

Cited
  Shared   
  Discussed   
[1] LIU Xiao，TANG Hui-ming，LIU Yu. A new model for landslide displacement prediction based on set pair analysis and fuzzy-Markov chain[J]. , 2009, 30(11): 3399 -3405 .
[2] HU Da-wei, ZHOU Hui, XIE Shou-yi, ZHANG Kai, SHAO Jian-fu, FENG. Study of Biot’s coefficients of marble during plastic deformation phase[J]. , 2009, 30(12): 3727 -3732 .
[3] SHI Xu-chao，HAN Yang. Water absorption test of soft clay after rebound under unloading[J]. , 2010, 31(3): 732 -736 .
[4] YUAN Xi-zhong, LI Ning , ZHAO Xiu-yun, YANG Yin-tao. Analysis of sensitivity of frozen ground bearing capacity to climate change in Northeast China permafrost regions[J]. , 2010, 31(10): 3265 -3272 .
[5] BAI Bing, LI Xiao-chun, SHI Lu, TANG Li-zhong. Slope identity of elastoplastic stress-strain curve and its verification and application[J]. , 2010, 31(12): 3789 -3792 .
[6] TANG Li-min. Regularization algorithm of foundation settlement prediction model[J]. , 2010, 31(12): 3945 -3948 .
[7] LI Zhan-hai，ZHU Wan-cheng，FENG Xia-ting，LI Shao-jun，ZHOU Hui，CHEN Bing-rui. Effect of lateral pressure coefficients on damage and failure process of horseshoe-shaped tunnel[J]. , 2010, 31(S2): 434 -441 .
[8] CAI Hui-teng, WEI Fu-quan, CAI Zong-wen. Study of silty clay dynamic characteristics in Chongqing downtown area[J]. , 2009, 30(S2): 224 -228 .
[9] SONG Ling　, LIU Feng-yin　, LI Ning　. On mechanism of rotary cone penetration test[J]. , 2011, 32(S1): 787 -0792 .
[10] JIN Jie-fang , LI Xi-bing , YIN Zhi-qiang , ZOU Yang. A method for defining rock damage variable by wave impedance under cyclic impact loadings[J]. , 2011, 32(5): 1385 -1393 .
Copyright © Rock and Soil Mechanics, All Rights Reserved.
Tel: 027-87198484, 87199252, 87199253, 87198752　E-mail: ytlx@whrsm.ac.cn
Powered by Beijing Magtech Co. Ltd