Study On Road Performance And Filling Technology Of Solidified Muddy Soil By Fly-Ash

With the acceleration of our country urbanization process, traffic infrastructure construction is in the rapid developing golden period,then the environmental protection problem and resources shortage problem followed by it is increasingly outstanding. Highway construction in ensuring sustainable development, while solving the problem of environmental protection and resource scarcity of effective measures at the same time have been of increasing concern.This paper combines the environmental pollution produced by muddy soil traditional parabolic filling and the inadequacy problem of highway embankment filling materials. We added fly-ash to muddy soils and then solidify muddy soils. By tests we research the compaction characteristics, unconfined compression strength, time delay and water stability of the muddy soil fly-ash curing agent and analyze the effects of compaction delay and polypropylene-fiber on solidified muddy soil. And we systematically analyze the construction technology of the muddy soil fly-ash embankment backfill and constructionfilling embankment which relies on the project of Xing-Tai Road in Jiangsu province .Then we obtain the research results as follows:1. Compaction test of solidified muddy soil by fly-ash shows that the maximum dry density of muddy soil and fly-ash mixture increased with fly-ash decreases, optimal water content of the mixture increases with the fly-ash increases. After the incorporation of fly-ash sludge, with the increase in delay time tamping, the maximum dry density of improved soils decreases; the optimal w increased. CBR value of the soils increases as the curing agent of fly-ash content increases.2. Triaxial test of solidified muddy soil by fly-ash shows that improved soils tend to show the trend of brittle failure with water content reduced and fly-ash content increased. c andφof the soils increases with increases of age, fly-ash content, fiber content increases. If the improved soil is not timely tamping, its strength will become lower and lower with the time delay. And the strength of solidified soils in non-saturated silt under the water becomes lower with w increase.3. The use of solidified muddy soils in construction site showed that the strength of waste muddy soils solidified by fly-ash significantly improves. And engineering parameters like water content and degree of compaction meet the requirements of embankment materials. And we should control the height of muddy soils and fly-ash during construction strictly, and we should make every effort to smash the soil particles to increase the size of the hydration reaction by making full contact with the soils and fly-ash.