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Swelling Force of Weathered Sand of Improved Expansive Soil
Yang Jun, Yang Zhi, Zhang Guodong, Tang Yunwei
2014, 33(4):
106-109.
DOI: 10.3969/j.issn.1674-0696.2014.04.22
Based on the expansive soil of a certain highway construction
section of Yichang in Hubei province, the weathered sand distributed
widely at the local was used to modify the expansive soil. 0%, 10%,
20%, 30%, 40%, 50% of the weathered sand was mixed into expansive soil
respectively. Samples were made successively according to the dry
density, that is 1.6, 1.7, 1.8, 1.9, 2.0 g/cm3. The influence of
different sand ratios and different initial dry densities on the
swelling force of the weathered sand modified expansive soil was
researched by the indoor balanced way. Experiments show that: when the
initial dry density is the same, with the increase of weathered sand
content, the swelling force increases slowly at first and then
decreases rapidly, and there are three times of polynomial function
relation between weathered sand content and swelling force; when the
sand ratio is determined, with the increase of initial dry density, the
swelling force increases gradually, and the relation between initial
dry density and expansion force is logarithm function. The greater the
sand ratio is, the smaller the decrease amplitude of expansive force
is; the bigger the initial dry density is, the larger the decrease
amplitude of expansive force is. Weathered sand can effectively inhibit
the expansion of expansive soil.
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