In the construction and operation processes of underground storage cavern in bedded salt

ground subsidence

even earth surface collapse accidents

resulted by the storage cavern contraction and overlying rock deformation is an important accident type. Aimed at the ground subsidence accidents caused by underground storage cavern

this paper reveals the mechanism and builds the fault tree model of this type of accidents

finds out 14 failure patterns as well as 10 basic influence factors

also

puts forward the related control measures. Then Yunmeng-Yingcheng salt mine is taken as an example to forecast the severity of accident consequence. On the premise that ground subsidence accident happened at Yunmeng-Yingcheng salt mine

the severity probability of the accident consequence is analyzed using fuzzy comprehensive evaluation. Research results show that the severity of accident consequence belong to negligible level

to be considered level

serious level

very serious level and calamitous level are 0.24

0.28

0.29

0.15

0.04 respectively. The results are useful to prevent ground subsidence accidents caused by the storage caverns. What’s more

it also provides according theory and a feasible way for appraising the loss severity before the accident happening