摘要
为研究动载下洞室加固锚杆的受力特点,应用快速拉格朗日差分分析程序FLAC对爆炸动载下全长粘接式锚杆加固洞室时的洞室效应进行了模拟。围岩体的压力变化模拟结果表明,随着与爆源距离的增加,围岩受较大爆炸应力波的正压力到较小反射拉伸压力的作用;洞室顶底板位移速度变化模拟结果看出洞室顶板先以较大的速度向下,由于受边墙变形的挤压和加固后围岩体的弹性变形影响,又以较慢的速度向上;锚杆在动载下受力数值模拟表明,从锚杆锚端到锚头轴力压力逐渐降低,拉力逐渐增加。模拟结果与理论分析和实验室实测的数据规律具有一致性。
To study the reinforcement cavern bolt force characteristics under dynamic loads,fast Lagrangian analysis program FLAC was used to calculated length bonding load-type bolt reinforcement cavity effect under dynamic loading in explosion in this paper.The simulation results of pressure changes surrounding the body show that with the pressure change with increasing distance from the explosion source,mainly by being more explosion stress waves reflected positive pressure to the smaller role of tensile stress.The simulation results show that cavern roof and floor displacement rate of change in the roof cavity to a larger rate of the first down,due to deformation of the extruded side walls and reinforced elastic deformation of rock bodies so,on a slower speed up.The bolt force by dynamic loading numerical simulations show that,from the first anchor bolt anchor-ended axial pressure gradually reduced,tension gradually increased.The law of simulation results with the theoretical analysis and laboratory experimental data is consistent.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2009年第S2期42-46,共5页
Acta Armamentarii
基金
国家自然基金项目(40638040
50874039)
河南省教育厅自然科学基金(2006130002)
河南省高校骨干教师资助项目
河南省重点攻关项目(092102310313)
关键词
动载
锚杆
加固
数值模拟
dynamic loading
rock bolt
reinforcement
numerical simulation
