复杂煤层赋存条件下螺旋滚筒力学行为研究

Study on Mechanical Behaviour of Spiral Drum under Complex Condition of Coal Seam

为研究复杂煤层赋存条件下螺旋滚筒的力学行为,基于Drucker-Prager屈服准则构建出煤岩材料的本构模型。通过对螺旋滚筒截割过程进行了数值模拟,得到了煤岩体的应力分布、截齿以及螺旋滚筒的受力变化规律。在0°~12°范围内,随着倾斜角的增加,截齿受力均值增大了30.9%。牵引速度增大使得与截齿接触的煤岩体所积聚的弹性能量和脆性增加,煤、岩体应力最大增幅分别为40.1%和9.3%;螺旋滚筒转速降低使得与截齿接触的煤岩体应力有所降低,煤、岩体应力最大降幅分别为27.0%和7.5%。牵引速度增大及螺旋滚筒转速的降低使得三向力中牵引阻力的增幅最大,其最大增幅为91.73%。螺旋滚筒载荷大小及波动随截割对象性质不同而出现明显的变化。

In order to study the mechanical behaviour of spiral drum under complex condition of coal seam,the constitutive model for coal and rock materials was constructed based on Drucker-Prager yield criterion.Through the numerical simulation of the cutting process of spiral drum,the stress distribution of the coal and rock mass,the force variation law of the pick and the spiral drum are obtained.In the range of 0°~12°,the mean force of the cutting pick increases with the increasing of dip angle by 30.9%.The increase in traction speed led to the increase in elastic energy and brittleness accumulated in coal and rock mass contact with the cutting pick,and the maximum stress of coal and rock mass increased by 40.1%and 9.3%.The reduce in spiral drum speed led to a decrease in the stress of coal rock body in contact with the pick,and the maximum stress of coal and rock mass reduced by27.0%and 7.5%.The increase in traction speed and the reduce in rotation speed of spiral drum caused the greatest increase in traction resistance among the three-way forces,with the maximum increased by 91.73%.The load and fluctuation of the spiral drum varied significantly with the nature of cutting object.