Based on structural plane stereographic projection analysis of four platform slope

i.e.320

350

380

410 platforms in Xiyuanling

Jiangxi Province

where 320

350

380

410 platforms mean the platforms at 320

350

380 and 410mhigh respectively

it is known that

the 410 platform has five kinds of combinations

380 platform has one kind of combinations

350 platform has three kinds of combinations

320 platform has one kind of combination which can occur platform wedge destruction.And 410

350

320 platform each has a place where may occur single plane damage.Then using rigid body limit equilibrium methods for various real potential failure surface under two kinds of natural and storm conditions the stability analysis was carried out.The results show that the wedge destruction controlled by 380 platform F380-01 and F380-02 in the natural state and storm conditions is less than the safety factor.The wedge destruction controlled by 350 platform F350-03 and F350-04

and the single plane destruction controlled by 320 platform F320-11 is greater than safety factor in natural conditions

and less than safety factor in storm conditions.Comparative analysis shows that stereographic projection method can very quickly search the structure of the sliding surface possible combinations.However

to determine whether the combination of the actual structure is sliding surface needs furtheremore quantitative analysis.