爆炸荷载下不同锚固参数围岩的加速度响应分析
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摘要
地下洞室岩体加速度过大易造成围岩的不稳定,通过由模型试验得到的加速度-时程曲线分析,研究了爆炸荷载作用下不同锚固参数洞室围岩的加速度响应特征。分别阐述了洞室拱顶、底板、两帮加速度时程曲线的形态及其峰值大小,重点比较了洞室围岩因锚杆加固方式的不同对爆炸产生加速度响应的差异,结果表明,拱顶垂直和右帮水平加速度-时程曲线较光滑,而底板和左帮垂直加速度-时程曲线存在较大震动;洞室拱顶加速度峰值最大;4个洞室中锚杆间距最小的洞室,其拱顶、两帮加速度比其他洞室的小,而底板加速度比其他洞室的略大,可见减小锚杆间距可以增加洞室稳定性。
If acceleration of rock mass is too large,the surrounding rock of underground cavern is not stable. By analyzing time-history curves of acceleration obtained by model test,the acceleration response characteristics of surrounding rock with different anchorage parameters in underground cavern subjected to explosive loads are studied. The forms and peak values of the time-history curves of acceleration of underground cavern's crown,floor and two sides are explained respectively. Because of the different reinforcing modes,the distinctions of the acceleration response of surrounding rock of underground cavern are compared emphatically. The results indicate that the time-history curves of the vertical acceleration of crown and the horizontal acceleration of floor right side are smooth enough;but the vibration of the time-history curves of the vertical acceleration of floor and the left side are larger than the others. The acceleration of the crown is the largest than the other positions. For the cavern of the smallest spacing of rock bolts in four underground caverns,the acceleration of its crown and two sides is smaller than the other caverns;but the acceleration of its floor is larger slightly than the others'. By means of comparing and analyzing above,reducing the spacing of the rock bolts can enhance the stabilization of underground cavern.
If acceleration of rock mass is too large,the surrounding rock of underground cavern is not stable. By analyzing time-history curves of acceleration obtained by model test,the acceleration response characteristics of surrounding rock with different anchorage parameters in underground cavern subjected to explosive loads are studied. The forms and peak values of the time-history curves of acceleration of underground cavern's crown,floor and two sides are explained respectively. Because of the different reinforcing modes,the distinctions of the acceleration response of surrounding rock of underground cavern are compared emphatically. The results indicate that the time-history curves of the vertical acceleration of crown and the horizontal acceleration of floor right side are smooth enough;but the vibration of the time-history curves of the vertical acceleration of floor and the left side are larger than the others. The acceleration of the crown is the largest than the other positions. For the cavern of the smallest spacing of rock bolts in four underground caverns,the acceleration of its crown and two sides is smaller than the other caverns;but the acceleration of its floor is larger slightly than the others'. By means of comparing and analyzing above,reducing the spacing of the rock bolts can enhance the stabilization of underground cavern.
引文
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[2]SINGH P K.Blast vibration damage to underground coal mines from adjacent open-pit blasting[J].International Journal of Rock Mechanics&Mining Sciences,2002,39(8):959-973.
[3]刘慧.近距侧爆情况下马蹄形隧道动态响应特点的研究[J].爆炸与冲击,2000,20(2):175-181.LIU Hui.Dynamic responses of hoof-shaped tunnels to adjacent blastings[J].Explosion and Shock Wave,2000,20(2):175-181.
[4]曾宪明,杜云鹤,李世民.土钉支护抗动载原型与模型对比试验研究[J].岩石力学与工程学报,2003,22(11):1892-1897.ZENG Xian-ming,DU Yun-he,LI Shi-min.Testing study of prototype and model comparison on resisting dynamical load with soil nail supporting[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1892-1897.
[5]喻晓今,余学文,张豫.数种情形下土钉的瞬态应变累积效应分析[J].华东交通大学学报,2006,23(4):1-4.YU Xiao-jin,YU Xue-wen,ZHANG Yu.Analysis of the effect of cumulation of transient strain on soil nail in several cases[J].Journal of East China Jiaotong University,2006,23(4):1-4.
[6]王昆明,唐德高,贺虎成,等.破碎带对地下坑道动力响应影响的数值分析[J].防灾减灾工程学报,2007,27(1):74-79.WANG Kun-ming,TANG De-gao,HE Hu-cheng,et al.Numerical analysis of the effect of fractured zone on dynamic response of underground tunnels[J].Journal of Disaster Prevention and Mitigation Engineering,2007,27(1):74-79.
[7]李海波,朱莅,吕涛,等.考虑地震动空间非一致性的岩体地下洞室群地震反应分析[J].岩石力学与工程学报,2008,27(9):1757-1766.LI Hai-bo,ZHU Li,LüTao,et al.Seismic response analysis of an underground cavern groups in rock subjected to spatially non-uniform seismic ground motion[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(9):1757-1766.
[8]陈剑杰,孙钧,林俊德.深埋岩石洞室受爆炸应力波荷载作用的破坏效应[J].辽宁工程技术大学学报(自然科学版),2001,20(4):402-404.CHEN Jian-jie,SUN Jun,LIN Jun-de.Failure of deep-buried rock openings under blast stress wave[J].Journal of Liaoning Technical University(Natural Science),2001,20(4):402-404.
[9]朱波,赵国志,阳波.钻地炸弹近爆地下工事的动力响应数值分析[J].箭弹与制导学报,2005,25(4):60-62.ZHU Bo,ZHAO Guo-zhi,YANG Bo.Numerical analysis of dynamic response about drill-ground bomb nearly on underground engineering[J].Journal of Rockets,Missiles and Guidance,2005,25(4):60-62.
[10]王礼立.应力波基础[M].北京:国防工业出版社,2005.
[11]杨自友,张速,顾金才,等.球面波传播特性和围岩动态裂纹产生的数值试验研究[J].振动与冲击,2010,29(5):110-113+244.YANG Zi-you,ZHANG Su,GU Jin-cai,et al.Numerical test study on spherical explosive wave propagating characteristics and dynamical crack production in wall rock[J].Journal of Vibration and Shock,2010,29(5):110-113+244.
[12]李冀祺,马素贞.爆炸力学[M].北京:科学出版社,1992.
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