摘要
为研究拱腰集中装药下锚杆的动载响应特性,利用有限元分析程序LS_DYNA 3D,对锚杆的轴向应力分布规律进行了显示动力分析。对比爆心径向同一距离测点的实测压应力时程曲线,模拟结果曲线峰值、形态和趋势与之较为一致。迎爆侧受压强度明显大于背爆侧,最强的受压部位在迎爆侧拱腰;迎爆侧拱顶和拱腰受拉强度比较大,最强受拉部位在拱顶。受压峰值和受拉峰值从锚头到锚端都是先增加后减小,但最大峰值位置不同,并利用应力波原理和最大拉应力瞬时断裂准则分析其原因。
In order to study dynamic response of rock bolts under explosion load from hance, the distribution of axial pressure of rock bolts was analyzed by LS_DYNA 3D. Comparing pressure curves from the simulation and the test, the peak values, shape and trends of the results were in uniform. The peak pressure on face of blast wave was stronger than that on back of blast wave, and the location of the maximum peak pressure lied in the hance. Compared with other parts of the tunnel, the larger tension was in the range of vault and hance, and the maximum tension lied in the vault. From anchor head to anchor, the peak pressure and peak tension increased firstly, and then decreased, but the locations were different. The principles of stress waves and instantaneous fracture of the maximum tension were applied to disclose the inner mechanism.
出处
《爆破》
CSCD
北大核心
2015年第2期33-38,共6页
Blasting
基金
国家自然科学基金(41072225)
河南省科技攻关(1421022104 33)
河南省教育厅科学技术研究重点项目科技攻关计划(14A440003)
关键词
地下工程
锚杆
拱腰
爆炸荷载
动态响应
数值分析
underground engineering
rock bolts
hance
explosion load
dynamic response
numerical analysis
