Comparative Analysis Of Dynamic Compaction Method And Grouting Method Of Roadway Mined-out Area

In recent years,with the development of road engineering,some new roads inevitably through the coal mined-out area,mined-out area of governance research on the construction of the road has a very important significance.Affected by mined out area,partial collapse occurs during embankment construction.Based on an actual engineering,the survey and exploration methods of mined out area are analyzed and the settlement of subgrade above mined out area is investigated by numerical simulation.According to this study,Comprehensive treatment and reinforcement are suggested and certain research results are achieved.The main contents of this paper are as follows:(1)Based on the engineering field of Henan provincial highway 323 Line of Xinmi pass to Dengfeng Zhangzhuang section,high density resistivity method and shallow seismic method are used to detect the collapse section.Combined with actual drilling map,the detection results are analyzed,the classification of road bed and the relative position of gob distribution are classified.(2)According to the relative position of the goaf and the road bed,the gently distributed mined area is selected as the special case,combined with the engineering geological background,using the finite element analysis software Plaxis for numerical analysis.The results show that after the grouting treatment,the overall settlement is reduced compared with that before untreated,which plays the role of bed lifting,which is better for the whole treatment of road bed and rock formation.(3)According to the range of the shape and shape of the mined-out area,the consolidation effect of the dynamic compaction method is simulated.The dynamic compaction method has a quick effect on the settlement of the tamping layer and has an effect on the area near the mined-out area.settlement.According to the relative position relationship between the goaf and the road bed,the grouting method and the dynamic compaction method are used respectively,and the reasonable comprehensive treatment proposal is given.