Study on mining-induced deformation and failure mechanism of soft and hard interbedded gentle counter-inclined rocky slopes
In order to study the mining-induced deformation and failure mechanism of soft and hard interbedded gentle count-er-inclined rocky slopes in southwestern mining area of China,taking Duyun coal cave slope of Guizhou province as an exam-ple,the numerical simulation was used to analyze the deformation and failure characteristics of soft and hard interbedded gen-tle counter-inclined rocky slopes induced by mining.The action law of mining on the slopes was discussed,and the deforma-tion and failure mechanism of the slopes by single-condition mining and repetitive mining under the retained coal pillar was studied.The results show that the mining close to the slope surface working face and the repetitive mining under the retained coal pillar have the greater influence on the stability of slope body.The mining-induced fissures are first concentrated on both sides of goaf and develop upward,and the separation fissures between soft and hard interlayers are generally likely to occur.The retained coal pillar can prevent the slope subsidence and fragmentation,but it may also aggravate the decline of slope sta-bility.The research results can provide a theoretical reference for the geological disasters of mountain instability induced by underground mining of soft and hard interbedded gentle counter-inclined rocky slopes.
mining-induced fissuredeformation characteristicssoft and hard interbeddinggentle counter-inclineddis-crete element