Model Test Research On Loess Embankment Slope Treated By Dynamic Compaction

Along with the urbanization construction gradually developed,urban construction landbecame less and less.In order to avoid occupy arable land,many cities put forward the"industry out of the city, project up the hill" development strategy.In some areas cities evenare built in the mountains.If constructions were built in the mountains,cutting mountain andfiling the ditch can not be avoid.Therefore,the problem of fill slope will be encounteredfrequently,which need to be worked out urgently.In view of the current status of construction land becoming increasingly nervous,thisarticle choose dynamic compaction used in mountainous area to form fill slope as researchtopic,which researched in numerical stimulation and indoor model testing.First,Foundation reinforcement mechanism by dynamic consolidation were summarizedfrom such perspectives:dynamic compaction theory and Seismic wave theory.Besides.thedynamic compaction used in unsaturated loess was analysis by macro micromeans.Furthermore,combined with the construction method of “layered filling and layereddynamic compaction”,the mechanism of fill slop which was formed by dynamic compactionwas analysis. Finally,it comes to a conclusion that fill slope can be built by dynamiccompaction.Second,indoor model test of loess embankment slope formed by dynamic compactionwas experimented.Through dynamic compaction grouping test,the change rule of thephysico-mechanical parameters of every stratum behind the temping points and between thetemping points was worked out.Besides,the influence of the tamper weights and drop distanceto every stratum was obtained.And also,the paper investigated the regularity of every stratumexpansion uniformity affected by tamping method.At last,combined with a dynamic compaction fill slope of a certain power plant,the paperused MIDAS/GTS for the slope stability analysis.Through changing the rate,height and shape of slope,slope safety factor was worked out and maximum shear strain zone in slope was findout.By way of analysis, it come to some useful conclusion:keeping slope embankment underthe condition of constant height,the critical slip surface in slope got closer slope surface andsliding out point got closer to slope toe with the increase of slope rate.under the condition ofthe slope rate unchanged,the slope safety factor decreased roughly linearly with the increaseof slope rate.furthermore,divided step can improve the stability of the slope,but not for theinfluence of the position of maximum shear strain.