Effect Analysis And Application Research On Dynamic Compaction Used To Collapsible Loess Foundation Of Xigou Tailings

As high potential artificial debris flow dangerous source,tailing pond exists the dam-break risk,and once tailing pond accident happened due to artificial factors or force majeure,life and property of people living in the downstream will loss a lot.The foundation condition of tailing pond is one of the main factors that influenced saturation surface positions while the seepage is one of the import factors that influenced dam stability,and the break caused by insufficient strength of foundation may be lead to landslide of tailing dam directly.This paper compared seepage field and stability of tailing dam before and after that collapsible loess is handled by making use of the dynamic consolidation,the main content as follows:Firstly,summarize the physical mechanical properties of collapsible loess,described the theory of dam stability of tailing pond and dynamic consolidation reinforcement to collapsible loess.Secondly,introduce the analysis theory of seepage field and dam stability of MIDAS GTS NX.Based on simplified model of tailing pond,by using continuous seepage-stress method,numerical simulation is carried to attain saturation surface distributions,pore water pressure distributions,plastic zones and safety factors in different foundation condition of collapsible loess,then,compare respective seepage field and stability.Thirdly,combined collapsible loess actual situation of the primary dam foundation in the Xigou tailing pond,related parameters design and construction scheme are put forward about how to use dynamic consolidation reinforcement to handle collapsible loess.Finally,For the engineering example with the Xigou tailing pond,by handling collapsible loess in the primary dam foundation by making use of the dynamic consolidation,the collapsibility of foundation is eliminated,the compressibility of soil is reduced,the bearing capacity of foundation is raised.Numerical simulation is carried by using MIDAS GTS NX to attain saturation surface distributions,pore water pressure distributions,plastic zones and min-safety factors before and after handled foundation,and draw the conclusion that dam stability improves after the foundation handled compared three-dimensional seepage field and stability before and after handled foundation.