Research On The Key Technology Of Soft Soil Highway Roadbed Widening Treatment

With the rapid growth of the volume of traffic, highway is facing the problem of widening and expansion, especially, the segment on soft foundation for widening needs complex analysis and processing. No mature experience can be followed to widen the existing highway, and there are many constraints from designing to construction; what’s more, there are some technical problems in the widening projects that have been completed, and the project results can’t be guaranteed. Thus systematic research of widening the highway on soft foundation is very urgent.Firstly, this paper analyzes the disease and disposal technologies arising after the highway widening. Lists some of the major diseases and analyzes the causes of the disease produced theoretically, as well as some methods approach to road disease.Then through the construction segment k79 working condition analysis, including CFG pile and jet grouting pile these two ways, a graph depicting the settlement, research on foundation settlement issues, comparative analysis of the pros and cons of the two piles treatment, construction of the future reasonable suggestions.Finally, through the experimental method to the state old roadbed slope were investigated, including some aspects: distribution along the cross section along the height of the distribution, level state analysis, lap joint reinforcement technology. Meanwhile get most of the old embankment slope degree of compaction of the soil less than the design requirements, so a strong tamping machine to recover secret technology to new and old roadbed slope overlapping parts of reinforcement, and use liquid fly ash technique to solve vehicle bumping at bridge, backfill settlement problem.