爆破动载下全长锚固玻璃钢锚杆累积受力特征研究  

Study on the Cumulative Stress Characteristics of Fully Grouted GFRP Bolts under Blasting Dynamic Load

作　　者：刘超 王文杰[1,2] 黄永祥[3] 贾稳宏 朱大铭[3] LIU Chao;WANG Wenjie;HUANG Yongxiang;JIA Wenhong;ZHU Daming(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan 430081,China;No.3 Mine Area,Jinchuan Group Co.,Ltd.,Jinchang 737100,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 [3]金川集团股份有限公司三矿区,甘肃金昌737100

出　　处：《金属矿山》2023年第8期205-213,共9页Metal Mine

基　　金：国家自然科学基金项目(编号:51974206);湖北省安全生产专项资金科技项目(编号:KJZX202007007)。

摘　　要：针对全长锚固玻璃钢锚杆在多次爆破冲击作用下的损伤失效问题,依据金川三矿区玻璃钢锚杆支护参数及爆破振动现场实测数据,基于应力波反射拉伸破坏理论简化了锚杆动载受力模型并建立了数值计算方案,研究了单次及多次爆破动载下的全长锚固玻璃钢锚杆轴向受力特征,并通过全长锚固玻璃钢锚杆冲击试验结果验证了数值计算结果的可靠性。研究表明:在动载强度不变的情况下,不同爆破次数下的全长锚固玻璃钢锚杆轴向应力均沿杆体长度方向呈指数型下降,且锚杆最大轴向应力始终在孔口位置;随着爆破次数的增加,锚杆各部位轴向应力均不断增大,锚杆最大轴向应力增加更为明显,且轴向应力分布范围不断向锚固段深处延伸;随着爆破次数增加,玻璃钢锚杆最大轴向应力持续增大直至破坏,但金属锚杆轴向应力快速增大至一定数值后便趋于平稳,两者具有明显差异性;随着动载强度的增大,玻璃钢锚杆失效前的最大受力次数整体上呈先快速下降后缓慢下降的指数型变化特征。研究结果可为爆破冲击作用下的玻璃钢锚杆支护设计及爆破控制提供理论依据。In view of the damage and failure of full-length anchored GFRP bolt under multiple blasting shocks,this paper is based on the supporting parameters of GFRP bolt and the field measured data of blasting vibration in Jinchuan No.3 mining area,based on the stress wave reflection tensile failure theory,the dynamic load model of anchor is simplified and the numerical calculation scheme is established,and the axial stress characteristics of full-length anchored GFRP bolt under single and multiple blasting dynamic loads are studied.The reliability of the numerical results is verified by the impact test results of the fulllength anchored GFRP bolt.The results show that under the condition that the dynamic load strength is constant,the axial stress of the full-length GFRP bolt decreases exponentially along the length direction of the rod under different blasting times,and the maximum axial stress of the bolt is always at the orifice position.With the increase of blasting times,the axial stress in all parts of the bolt increases,the maximum axial stress increases more obviously,and the axial stress distribution extends to the depth of the anchoring section.With the increase of blasting times,the maximum axial stress of GFRP bolt increases continuously until it is destroyed,but the axial stress of metal bolt tends to be stable after rapidly increasing to a certain value,and there is an obvious difference between the two.With the increase of dynamic load strength,the maximum stress times before GFRP bolt failure shows the exponential characteristics of first rapid decrease and then slow decline.The research results can provide a theoretical basis for the design and blasting control of GFRP bolt support under blasting impact.

关 键 词：多次爆破动载 全长锚固 玻璃钢锚杆 轴向应力 累积受力 

分 类 号：TD353[矿业工程—矿井建设]