| Expansive soil is a special kind of cohesive soil, its mineral compositioncontaining montmorillonite, illite and kaolinite, and so on. With montmorillonite andillite have relatively strong water sensitivity, resulting in the expansive soil is expandingunder the influence of water, water shrinkage, again meet water to the expansion of theengineering characteristics, has the very big harm to each kind of engineering.Based on the expansive soil in handan area as an example, through the test ofexpansive soil mixed with different modified materials, compare the expansive soil, soiland all kinds of improved soil as the engineering properties of compacted fill material,to find a new way to improve the expansive soil in handan area.First of all, familiar with all kinds of modified mechanism of expansive soil,according to the domestic and foreign about the present situation of the expansive soilimprovement, different improvement schemes are put forward. And relevant tests arecarried out, including physical and mechanical properties of expansive soil test (naturalmoisture content, specific gravity, density, liquid limit, plastic limit, free expansion rate)and the improvement of some indicators of soil test, compaction test, no charge inflationrate experiment, expansion force, free expansion rate), analysis and comparison ofvarious modified scheme features, the best way to get fit for expansive soilimprovement in handan area.This article main research results are based on laboratory test results obtained forthe basic physical and mechanical properties of expansive soil in handan area index,understanding of various materials modified chemical mechanism of the swell-shrinkcharacteristics of expansive soil, finally got improved expansive soil in handan area badengineering properties of the improved method is the most suitable mixed with fly ashand polypropylene fiber, the optimum content of polypropylene fiber is0.9%, theoptimum content of fly ash is8%. |
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