›› 2010, Vol. 31 ›› Issue (3): 851-855.

• Geotechnical Engineering • Previous Articles     Next Articles

Discussion on the compaction degree index of subgrade filled with laterite

TAN Yun-zhi 1, 2，KONG Ling-wei1，GUO Ai-guo1，FENG Xin1，WAN Zhi3   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, Three Gorges University, Yichang 443002, China; 3. Hunan Communications Research Institute, Changsha 410015, China
  • Received:2009-02-10 Online:2010-03-10 Published:2010-03-31

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Abstract:

Laterite soil is one of the typical and special soil. There are clearly states in the technical specification of highway subgrades that the compaction degree can be reduced according to the specific condition when the subgrade constructs with special fillings. Moreover, the subgrade can’t be filled directly with high liquid limit and high plastic index soils. By using the laterite of one highway, a series of compaction and California bearing ratio (CBR) tests are carried out; the results indicate that laterite is sensitive to water strongly; the water content corresponding to the maximum CBR is 3 % greater than the optimal one. In addition, according to the rules that strength, compressibility, swelling-shrinkage, permeability indexes change with compaction degree, the compaction degree of laterite which is as sub-embankment filling can be reduced by 2.5 %, the water content is around 35 % during compaction.

Key words: laterite, subgrade, compaction standard, special soil

CLC Number: 

  • TU 446
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