空气锤钎头破岩机理仿真分析

基于非线性动力学理论,利用ANSYS/LS-DYNA显式动力学分析软件建立空气锤钎头与岩石的破岩机理仿真模型,对钎头的破岩过程进行仿真分析,认为钎头破碎岩石的过程分为4个阶段,即弹性变形阶段、塑性变形阶段、裂纹萌生阶段和破碎完成阶段。最后对花岗岩、砂岩、白云岩、页岩、灰岩5种不同类型的岩石在同一条件下的破岩结果进行比较。结果表明,花岗岩的侵入深度最小,灰岩的侵入深度最大;页岩的体积破碎量最小,花岗岩的体积破碎量最大。由仿真发现,岩石体积破碎主要发生在卸载阶段。不同类型岩石的体积破碎量和侵深虽然不同,但整体的破岩曲线走向是一致的,即破岩规律是相似的。

A simulation analysis of the rock-breaking mechanism of the air hammer bit

Based on the nonlinear kinetic theory,the ANSYS/LS DYNA explicit kinetic analysis software was adopted to establish the simulation model of air hammer bit and rock-breaking mechanism.The simulation analysis of the rock-breaking process of the bit was conducted.It was thought that the rock-breaking process included four stages,namely,elastic deformation stage,plastic deformation stage,crack initiation stage and fragmentation completion stage.Finally,a comparison was conducted of the rock-breaking result of granite,sandstone,dolomite,shale and limestone under the same condition.The result showed that the granite invasion depth was minimum and that of limestone was maximum.The volume crushing of shale was minimum and that of granite was maximum.The simulation found that the rock volume fracture took place at the unloading stage.Although the volume crushing and invasion depth of different types of rocks were different,the overall tendency of rock-breaking curve remained the same.In other words the rock-breaking law was similar.