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Deformation effect of lateral roof roadway in close coal seams after repeated mining 被引量:2
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作者 Xie Jianlin Xu Jialin +2 位作者 Wang Feng Guo Jiekai Liu Donglin 《International Journal of Mining Science and Technology》 SCIE EI 2014年第5期597-601,共5页
This paper analyzed the deformation mechanism in lateral roof roadway of the Ding Wu-3 roadway which was disturbed by repeated mining of close coal seams Wu-8 and Wu-10 in Pingdingshan No. 1 Mine. To determine the str... This paper analyzed the deformation mechanism in lateral roof roadway of the Ding Wu-3 roadway which was disturbed by repeated mining of close coal seams Wu-8 and Wu-10 in Pingdingshan No. 1 Mine. To determine the strata disturbance scope, the strata displacement angle was used to calculate the protection pillar width. A numerical model was built considering the field geological conditions. In simulation, the mining stress borderline was defined as the contour where the induced stress is 1.5 times of the original stress. Simulation results show the mining stress borderline of the lateral roadway extended 91.7 m outward after repeated mining. Then the original stress increased, deforming the road- way of interest. This deformation agreed with the in situ observations. Moreover, the strata displacement angle changed due to repeated mining. Therefore, reselection of the displacement angle was required to design the protective pillar width. Since a constant strata displacement angle was used in traditional design, the orooosed method was beneficial in field cases. 展开更多
关键词 Repeated mining Mining stress borderline Strata displacement angle Lateral roof roadway Protective pillar
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Relationship between loading angle and displacing angle in steel bolt shearing
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作者 Yu CHEN Ping CAO +1 位作者 Ke-ping ZHOU Yun TENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第4期876-882,共7页
When subjected to shear loading condition,a steel rock bolt will become bent in the field close to the loading point in situ.The bolt is deformed as the joint displacement increases,which can mobilize a normal load an... When subjected to shear loading condition,a steel rock bolt will become bent in the field close to the loading point in situ.The bolt is deformed as the joint displacement increases,which can mobilize a normal load and a shear load on the bolt accordingly.In this work,the relationship analysis between the displacing angle and loading angle is carried out.By considering elastic andplastic states of rock bolt during shearing,the rotation of bolt extremity can be calculated analytically.Thus,the loading angle isobtained from displacing angle.The verification of analytical results and laboratory results from reference research implies that theanalytical method is correct and working.In terms of in-situ condition,the direction of the load acting on steel bolt can be predictedwell according to the direction of the deformed rock bolt with respect to original bolt axis. 展开更多
关键词 steel rock bolt SHEAR displacing angle loading angle
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