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Sciences in Cold and Arid Regions ›› 2015, Vol. 7 ›› Issue (4): 456–468.doi: 10.3724/SP.J.1226.2015.00456

• REVIEW • 上一篇    

Processes and mechanisms of multi-collapse of loess roads in seasonally frozen ground regions: A review

GuoYu Li1, Wei Ma1, Fei Wang1,2, YanHu Mu1, YunCheng Mao1,3, Xin Hou1,2, Hui Bing1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Communication Research Institute of Gansu Province, Lanzhou, Gansu 730050, China
  • 收稿日期:2015-02-20 修回日期:2015-05-11 发布日期:2018-11-23
  • 通讯作者: Ph.D., Wei Ma, Professor of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences.No. 320, West Donggang Road, Lanzhou, Gansu 730000, China.Tel: +86-931-4967262; Fax: +86-931-4967302; E-mail: mawei@lzb.ac.cn E-mail:mawei@lzb.ac.cn
  • 基金资助:
    This work was supported by the National Key Basic Research Program of China (973 Program) (No. 2012CB026106), the Science and Technology Major Project of Gansu Province (No. 143GKDA007), the West Light Foundation of CAS for Dr. G.Y. Li, the Program for Innovative Research Group of the Natural Science Foundation of China (No. 41121061), and the Foundation of the State Key Laboratory of Frozen Soils Engineering of CAS (No. SKLFSE-ZT-11).

Processes and mechanisms of multi-collapse of loess roads in seasonally frozen ground regions: A review

GuoYu Li1, Wei Ma1, Fei Wang1,2, YanHu Mu1, YunCheng Mao1,3, Xin Hou1,2, Hui Bing1   

  1. 1. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Communication Research Institute of Gansu Province, Lanzhou, Gansu 730050, China
  • Received:2015-02-20 Revised:2015-05-11 Published:2018-11-23
  • Contact: Ph.D., Wei Ma, Professor of Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences.No. 320, West Donggang Road, Lanzhou, Gansu 730000, China.Tel: +86-931-4967262; Fax: +86-931-4967302; E-mail: mawei@lzb.ac.cn E-mail:mawei@lzb.ac.cn
  • Supported by:
    This work was supported by the National Key Basic Research Program of China (973 Program) (No. 2012CB026106), the Science and Technology Major Project of Gansu Province (No. 143GKDA007), the West Light Foundation of CAS for Dr. G.Y. Li, the Program for Innovative Research Group of the Natural Science Foundation of China (No. 41121061), and the Foundation of the State Key Laboratory of Frozen Soils Engineering of CAS (No. SKLFSE-ZT-11).

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摘要： Usually, the collapsible loess widely distributed across the world can serve as a type of foundation soil that meets its strength requirement after dense compaction and elimination of collapsibility. However, many problems such as cracks and differential settlement still occur in loess roads in the seasonally frozen ground regions after several years of operation. Many studies have demonstrated that these secondary or multiple collapses primarily result from the repeatedfreezing-thawing, wetting-drying, and salinization-desalinization cycles. Therefore, we conducted a research program to (1) monitor the in-situ ground temperatures and water content in certain loess roads to understand their changes, (2) study the effects of freezing-thawing, wetting-drying, and salinization-desalinization cycles on geotechnical properties and micro-fabrics of compacted loess in the laboratory, and (3) develop mitigative measures and examine their engineered effectiveness, i.e., their thermal insulating and water-proofing effects in field and laboratory tests. Our results and advances are reviewed and some further research needs are proposed. These findings more clearly explain the processes and mechanisms of secondary and multiple collapse of loess roads. We also offer references for furtherstudy of the weakening mechanisms of similar structural soils.

关键词: mechanics of loess, loess roads, secondary or multiple collapse, freezing-thawing, wetting-drying, salinization-desalinization

Abstract: Usually, the collapsible loess widely distributed across the world can serve as a type of foundation soil that meets its strength requirement after dense compaction and elimination of collapsibility. However, many problems such as cracks and differential settlement still occur in loess roads in the seasonally frozen ground regions after several years of operation. Many studies have demonstrated that these secondary or multiple collapses primarily result from the repeatedfreezing-thawing, wetting-drying, and salinization-desalinization cycles. Therefore, we conducted a research program to (1) monitor the in-situ ground temperatures and water content in certain loess roads to understand their changes, (2) study the effects of freezing-thawing, wetting-drying, and salinization-desalinization cycles on geotechnical properties and micro-fabrics of compacted loess in the laboratory, and (3) develop mitigative measures and examine their engineered effectiveness, i.e., their thermal insulating and water-proofing effects in field and laboratory tests. Our results and advances are reviewed and some further research needs are proposed. These findings more clearly explain the processes and mechanisms of secondary and multiple collapse of loess roads. We also offer references for furtherstudy of the weakening mechanisms of similar structural soils.

Key words: mechanics of loess, loess roads, secondary or multiple collapse, freezing-thawing, wetting-drying, salinization-desalinization

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