【摘要】：根據(jù)直墻拱形隧洞爆破振動(dòng)速度的現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),文章分析了鄰近巖體爆破開挖誘發(fā)的隧洞圍巖質(zhì)點(diǎn)振動(dòng)速度分布規(guī)律。在此基礎(chǔ)上,采用數(shù)值模擬方法研究了在爆破P波作用下鄰近隧洞圍巖的質(zhì)點(diǎn)振動(dòng)速度的縮放效應(yīng)并分析了其主要影響因素,對(duì)比分析了振動(dòng)速度縮放效應(yīng)與動(dòng)應(yīng)力集中效應(yīng)的差異。計(jì)算結(jié)果表明,在P波作用下直墻拱形隧洞靠近振源一側(cè)圍巖的質(zhì)點(diǎn)振動(dòng)速度大于振源振動(dòng)速度,而另一側(cè)質(zhì)點(diǎn)振動(dòng)速度則小于振源振動(dòng)速度,圍巖質(zhì)點(diǎn)振速較大的區(qū)域的動(dòng)應(yīng)力集中系數(shù)較低,而圍巖質(zhì)點(diǎn)振速較小區(qū)域的動(dòng)應(yīng)力集中系數(shù)較高。
[Abstract]:Based on the field monitoring data of blasting vibration velocity of straight wall arch tunnel, the distribution law of surrounding rock mass vibration velocity induced by blasting excavation in adjacent rock mass is analyzed in this paper. On this basis, the scaling effect of particle vibration velocity of adjacent tunnel surrounding rock under the action of blasting P wave is studied by numerical simulation method, and the main influencing factors are analyzed. The difference between vibration velocity scaling effect and dynamic stress concentration effect is compared and analyzed. The calculated results show that the particle vibration velocity of the arched tunnel near one side of the vibration source is larger than that of the vibration source under the action of P-wave, while the vibration velocity of the other side is smaller than that of the vibration source. The coefficient of dynamic stress concentration is lower in the region with larger particle velocity of surrounding rock and higher in the region with smaller vibration velocity of surrounding rock.
【作者單位】： 中國(guó)地質(zhì)大學(xué)(武漢)工程學(xué)院;北京城建勘測(cè)設(shè)計(jì)研究院有限責(zé)任公司;中鐵二院重慶勘察設(shè)計(jì)研究院有限責(zé)任公司;
【基金】：重慶市科技計(jì)劃項(xiàng)目(cstc2014yykf B30003) 國(guó)家自然科學(xué)基金項(xiàng)目(51379194,41102196)
【分類號(hào)】：U451.2

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