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Research on the Chang Rule of Temperature Moisture and Frost of Silty Soil Subgradein in Seasonally Frozen Region

Author: YuDeZhong
Tutor: ChengPeiFeng
School: Northeast Forestry University
Course: Road and Railway Engineering
Keywords: Silty sands Roadbed Temperature Moisture content Frost heave rate Freeze-thaw cycles
CLC: U416.1
Type: Master's thesis
Year: 2011
Downloads: 106
Quote: 0
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Abstract


Silty sands rock after weathering product , particles between fine sand and silt , the particle composed mainly of sand and silt , sticky particles were relatively small . The lower silt natural moisture , particles smaller when more developed capillary action , Silt Subgrade in Seasonal Frost Region in the freezing process , the accumulation of moisture migration phenomenon is more significant , continued negative temperature conditions will exacerbate roadbed frost heave . Frost heaving has been plagued northern China in particular is a problem in severe seasonal frozen area of highway construction . Silt Subgrade study seasonal frozen area water , temperature variation , the amount of frost heaving of subgrade , and after a number of freeze-thaw cycles role subgrade soil strength variation in the Nen River Valley to select a representative two at Silt Subgrade the roadbed of water , temperature change monitoring and analysis , and soil samples of soil physical properties and hydrological properties and mechanical properties of test ; based on combined indoor frost heave test powder sand at different moisture content rate of frost heave rate and degree of compaction conditions ; using roadbed the frost heave mathematical model to calculate the amount of frost heaving ; CBR tests carried out under conditions of optimum moisture content , the different degree of compaction and freeze-thaw cycles , research Silt Subgrade strength after freeze-thaw cycle variation . The results show that : the subgrade soil in the freezing process , the temperature gradient , the accumulation of roadbed upper and largest frozen depths of moisture migration phenomenon significantly ; different depths , freezing unit thickness (0.2m) , due to the temperature difference between the different soil required the time difference; Silt Subgrade frost heave amount varies with the change of moisture content, degree of compaction , the moisture content and the degree of compaction is the impact of of Silt Subgrade frost heave the two main factors ; using mathematical models to calculate the the amount of frost heaving close to the field measurement results , verify the reliability of the the frost heave mathematical model ; subgrade soil CBR value decreased after freezing and thawing cycles . Results for the seasonally frozen ground region of Silt Subgrade and similar soil subgrade construction , design and frost heave Diseases provides theoretical support .

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CLC: > Transportation > Road transport > Road works > Roadbed, pavement engineering > Subgrade
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