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| Research on the effect of freeze and thaw cycles on the property and damage mechanism of M-CMC stabilized soil |
| YANG Qingwen，PEI Xiangjun，HUANG Runqiu |
| (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China) |
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Abstract A soil stabilization method using modified carboxymethyl cellulose(M-CMC) is developed to control soil loss of slope in seasonal frozen region. A series of laboratory experiments is conducted to study the effect of the number of freeze and thaw cycles and freezing temperatures on the shear strength，infiltration coefficient，structure and durability of stabilized loess and fine silty sand. Results show that the volume and infiltration coefficient of stabilized soil increase with the increasing of number of freeze and thaw cycles，but shear strength decreases. Volume，shear strength and durability decrease with the decreasing of frozen temperature，but infiltration coefficient increases. The volume and infiltration coefficient of stabilized loess changes more significantly compared to that of stabilized fine silty sand experiencing to frozen action. Meanwhile，the internal friction stress of silty sand changes more significantly compared to loess as the cementation of sand is weak. The durability both two stabilized soil shows similar trend. The coated cementation and adsorption between M-CMC and soil particles make a steady structure to increase water binding capacity. Hence，water content of soil specimens increases subjecting to frost heaving and thawing process. The higher sample?s water content is，the more serious plastic deformation and damage between aggregates is. This is the main reason why plastic deformation and even crack are generated for aggregate. Then the structure of stabilized soil is damaged and the properties of soil are affected. However，frost heaving damage from frozen are released and the durability of stabilized soil was held under the elastic connection between M-CMC and particles.
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2019, Vol. 38 
