Study on rockfall offset of disused mine slope based on orthogonal test
There are many influencing factors and large randomness of lateral offset of slope rockfall,which makes the design of protection engineering more difficult.In order to improve the accuracy and rationality of protection engineering design,the law of rockfall collapse of disused mine slope was studied.In order to highlight the key points and moderately save the workload of the test,the field orthogonal test method with four factors(slope angle,slope length,stone size and stone shape)and three levels was used.The experimental results and research conclusions were mainly reflected in four aspects.1)among the four factors,the slope length has a more significant impact on the offset ratio.While the other three factors have a slightly less significant impact and are roughly equal.Among them,only the stone shape has a strong regularity on the offset ratio.That is,the more irregular the stone shape,the greater the influence on the offset ratio.And the other three factors have no linear regularity on the impact of the offset ratio.2)the offset ratio used in the engineering design should not be less than 0.25.3)when the slope is partially covered with soil or vegetation,the offset ratio can be reduced.4)the uncertainty and regularity of rockfall of this kind of slope are greater and weaker.So it is appropriate to determine the offset ratio by on-site rockfall test when carrying out engineering investigation and design.This study has some innovations in the selection of test blocks,test methods and sites.And the results have certain guiding significance for the design of such protective engineering.
disused mineslopecollapse rockfalloffset ratiogeological disaster prevention and controlecological restorationengineering investigation and design
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