Combining the design of heightening and strengthening of the debris flow blocking dam in Dadi Trench of Tanchang County

two kinds of heightening reinforcement scheme is proposed.Based on fluid dynamics

the mud fluid and the pressure in blocking dam are determined in this paper by modeling mud fluid in CFX.To analyse the horizontal displacement of both heightening and strengthening schemes by using finite element analysis software

we obtain the horizontal displacement curve.The results show that

for the heightening and strengthening dam

the influence of stone impact force on the horizontal displacement turns out to be small;Buttressed heightening and strengthening scheme has more rigidity

but the sliding resistance and resistance to capsizing are basically the same

and it is helpful to save the amount of concrete;However

shear stress distribution is more concentrated in combination surface.