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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第1期146-150,共5页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.51074002)
安徽省高等学校省级优秀青年人才基金项目(No.2010SQRL086)
安徽建筑工业学院博士基金会资助(2009)
关键词
模型试验
爆炸应力波
时程曲线
加速度响应
震动特性
model test
explosive stress waves
time-history curve
acceleration response
vibration characteristics
