基于LS-DYNA的交错扇形深孔崩落法排间间隔时间优化研究

为了同时解决"隐患资源高效回收"和"空区隐患安全治理"这对矛盾问题,提出交错扇形深孔崩落法;采用室内试验和数值模拟相结合的方法,根据交错扇形布孔形式建立数值计算模型,按照1#矿体岩石的物理力学指标确定模型材料参数,采用LS-DYNA动力仿真软件优选扇形排间间隔时间.研究结果表明:当采空一区排间间隔为100 ms时,岩石...

Study on optimized selection for row interval time of staggered sector deep-hole caving method based on LS-DYNA

In order to simultaneously solve the contradictory problems of “efficient recovery of hidden dangerous resources” and “safety treatment of hidden hazards in goaf”,a staggered sector deep-hole caving method was proposed.The combined methods of indoor experiment and numerical simulation were used to establish the numerical calculation model according to the staggered sector arrangement forms of holes,then the material parameters of the model were determined according to the physical and mechanical indexes of 1# ore body rock,and the optimized selection of the sector row interval time was conducted by using the LS-DYNA dynamic simulation software.The results showed that when the row interval of No.1 goaf was 100 ms,the rock failure range was the largest,the collapse area was scattered,the roof disintegration was sufficient,and the blasting fragmentation was uniform.When the row interval of No.2 goaf was 50 ms,the transverse penetrated fracture generated at the joint of the cross roadway,which could ensure the continuous collapse of rock and provide free surface for the subsequent blasting.The field application results indicated that the treatment effect of hidden hazards in 1# ore body goaf was good by using the staggered sector deep-hole caving method,which not only eliminated the risk of isolated pillar collapse,but also ensured the safety of mining area construction under the goaf.