摘要
通过模型试验,研究了在平面装药爆炸应力波的作用下,全长粘结式锚杆加固洞室抗爆性能。试验结果表明,通过分析自由场压力-时程曲线,证明试验数据可靠;经过加固的洞室拱顶位移峰值减少明显,当比例距离为5.23cm/g1/2时,洞室发生破坏;在平面波的作用下,两个洞室洞壁各个位置都产生压应变,最大应变出现在拱脚处,随着比例距离减小,拱顶应变峰值先增加后减小,最大应变峰值越来越大;拱顶是加速度振动最激烈的地方,经过加固可以降低拱顶加速度,但效果不明显,在变形不大时底板加速度增加较大,必要时应该采取减震措施,经过加固洞室侧墙加速度普遍有不同程度减小,并且破坏越严重效果越明显,随着比例距离减小,拱顶和侧墙加速度越来越大,尤其当比例距离为5.23cm/g1/2时,加速度急剧上升。
Based on anti-explosion model test, the explosion resisting performance of the tunnel which is reinforced by fully bonded rock bolts is studied under explosive stress waves produced by plane charging. The results show that test data are reliable by analyzing pressure temporal curves of free field; vault displacement of the anchored tunnel is reduced significantly; and the tunnels are damaged when the scale distance is 5.23 cm/g^1/2; the surface strains of two tunnels are pressed under plane explosive stress waves, the most of which is on arch foot; with the reducing scale distance, the peak strains increase firstly; and then reduce, the maximal peak strains increase; the acceleration of roof is maximal, which is relatively reduced when anchored; and the acceleration of floor of the anchored tunnel is increased under the condition of small deformation which should be reduced as necessary by adopting some vibration-absorptive ways; the more the tunnel damages severally, the more the acceleration of ribs of the anchored tunnel reduce significantly, with the reducing scale distance, the acceleration of roof and ribs grow, especially when the scale distance is 5.23 cm/g^1/2.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第1期107-112,共6页
Rock and Soil Mechanics
关键词
全长粘结式锚杆
抗爆性能
模型试验
爆炸荷载
fully bonded rock bolts
explosion resisting performance
model test
explosive loads
