全长树脂锚杆在拉拔荷载作用下的轴向力分析  

Analysis force analysis of full length resin bolt under drawing load

作　　者：王德全 张超 张开诚 康明超 郭学庭 WANG Dequan;ZHANG Chao;ZHANG Kaicheng;KANG Mingchao;GUO Xueting(Sanshandao Gold Mine of Shandong Gold Mining Industry Co.,Ltd.,Laizhou Shandong 261442,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]山东黄金矿业(莱州)有限公司三山岛金矿,山东莱州261442 [2]北京科技大学土木与资源工程学院,北京100083

出　　处：《有色金属（矿山部分）》2021年第3期15-21,共7页NONFERROUS METALS(Mining Section）

基　　金：中央高校基本科研业务费资助项目(FRF-TP-15-042A1)。

摘　　要：为进行拉拔荷载作用下围岩剪应力和锚杆轴向力的分析,以Mindlin位移解为理论基础,基于理想弹塑性荷载传递模型,得出围岩剪应力分布与位移关系曲线,并结合某金矿具体工程实例进行验证分析。应用FLAC3D进行树脂锚杆拉拔实验模拟,分析锚杆在不同拉拔荷载作用下轴向力及围岩塑性区的分布情况,并与理论分析进行对比。研究表明:拉拔实验塑性区呈倒锥形分布;围岩剪应力呈负指数分布,围岩剪应力值在孔口位置为0,距离孔口50 mm范围内剪应力急剧增大至峰值,之后缓慢减小并在孔底位置趋近于0;树脂锚杆的轴向力在孔口位置受力最大,孔底轴向力逐渐减小并趋于零。研究结果可为树脂锚杆支护提供参考。The shear stress and axial force of rock bolt under pull load were analyzed,based on the Mindlin position transfer solution and the ideal elastic-plastic load transfer model,the relation curve of shear stress distribution and displacement in surrounding rock was obtained,and the verification analysis was carried out with a specific engineering example of a gold mine.FLAC3D was used to simulate the drawing experiment of resin bolt,and the distribution of plastic zone and shear stress of bolt under different drawing loads was analyzed,and compared with the theoretical analysis.The results showed that the plastic zone in the drawing experiment was inverted conical distribution.The surrounding rock shear stress was negatively exponentially distributed.The value of surrounding rock shear stress was 0 at the orifice.Within 50 mm from the orifice,the shear stress increased sharply to the peak value,then decreased slowly and approached 0 at the bottom of the orifice.Correspondingly,the axial force of the resin bolt was the maximum at the orifice position,and the axial force towards the bottom of the orifice gradually decreased and tended to zero.The research results can provide reference for resin bolt support.

关 键 词：树脂锚杆 拉拔实验 MINDLIN位移解 围岩剪应力 数值模拟 

分 类 号：TD353.6[矿业工程—矿井建设]