摘要
针对冲击荷载作用下围岩中锚杆间作用力瞬间激增造成的锚杆脆断、撕裂,支护失效等问题,设计了一种锚杆碟簧组减振缓冲结构。根据阻尼系统理论,建立了冲击荷载作用下锚杆碟簧组减振缓冲结构的振动力学方程,并采用Abaqus有限元数值模拟方法对比分析了同一冲击能量(2.25 kJ)下碟簧不同组合方式、不同材质(45#钢、Q235钢)结构与四种冲击能量(2.25 kJ、4.00 kJ、6.25 kJ、9.00 kJ)下,同一碟簧组结构的动力学响应特征。理论分析结果表明:碟簧组结构具有较好的减振缓冲能力,且随着阻尼比增加,减振缓冲能力会逐渐增大。模拟结果表明:在相同冲击荷载作用下,与无碟簧结构相比,对合、复合1、复合2碟簧组结构峰值荷载分别减少81%、65%和62%,作用时间分别延长19 ms、8 ms、5 ms,对合的45#钢、Q235钢材质组结构峰值荷载分别减少75%、43%,四种冲击荷载作用下,对合碟簧组结构峰值荷载分别减少81%、69%、58%、35%。这表明碟簧组结构具备优良的减振缓冲性能,能延长冲击荷载作用时间,降低荷载峰值,且与45#钢、Q23钢材质的对合组结构相比,对合碟簧组具备更好的减振缓冲性能,可以避免锚杆产生刚性破坏,保证在高冲击荷载作用下支护的稳定性。
Aiming at the proble ms of bolt brittle fracture,tearing and support failure caused by the instantaneous increase of force between bolts in surrounding rock under impact load,a damping buffer structure of bolt disc spring group was designed.According to the damping system theory,the vibration mechanics equation of the damping buffer structure of the bolt disc spring group under impact load was established.The Abaqus finite element numerical simulation method was used to compare and analyze the dynamic response characteristics of the same disc spring group structure under different combinations of disc springs,different materials(45#steel,Q235 steel)and four kinds of impact energy(2.25 kJ,4.00 kJ,6.25 kJ,9.00 kJ)under the same impact energy(2.25 kJ).The results of theoretical analysis show that the disc spring group structure has better damping and buffering capacity,and with the increase of damping ratio,the damping and buffering capacity will gradually increase.The simulation results show that under the same impact load,compared with the non-disc spring structure,the peak load of the involution,composite 1 and composite 2 disc spring group structure is reduced by 81%,65%and 62%respectively,and the action time is extended by 19 ms,8 ms and 5 ms respectively.The peak load of the involution 45#steel and Q235 steel group structure is reduced by 75%and 43%respectively.Under the action of four impact loads,the peak loads of the combined disc spring group structure are reduced by 81%,69%,58%and 35%respectively.This shows that the disc spring group structure has excellent vibration damping and buffering performance,which can prolong the impact load action time and reduce the load peak,and compared with the 45#steel and Q23 steel pairing structure,the disc spring group has better vibration damping and buffering performance,which can avoid the rigid failure of the bolt and ensure the stability of the support under the action of high impact load.
作者
尚江淮
缪易辰
潘文
彭启友
李蕊雪
袁勋
SHANG Jianghuai;MIAO Yichen;PAN Wen;PENG Qiyou;LI Ruixue;YUAN Xun(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Earthquake Engineering Researching Center of Yunnan,Kunming 650500,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2024年第S02期412-418,共7页
Materials Reports
关键词
冲击荷载
碟簧
减振缓冲
动力响应
数值模拟
impact load
disc spring
vibration damping buffer
dynamic response
numerical simulation
