When building earth-rock dam in river of high canyon,the excavation quantities of spillway will be very large.For saving project cost,the spillway can be directly plan on the dam,the chute of the spillway is generally more steep.In order to ensure its stability,to strengthen the base plate of spillway with multilayer level anchor rods is necessary.Through the stability analysis for the base plate,we can also obtain the relationship formula between the numbers and length of anchor rods and the stress.It can ...