【摘要】：在具有沖擊傾向性礦井的動(dòng)載支護(hù)設(shè)計(jì)中,地震動(dòng)對(duì)動(dòng)態(tài)載荷的估算有重要作用。目前,國(guó)內(nèi)外普遍采用半經(jīng)驗(yàn)公式(scaling law)來(lái)估算質(zhì)點(diǎn)峰值振動(dòng)速度(PPV)。然而,此方法在實(shí)際估算地震動(dòng)時(shí)忽略了地質(zhì)和巷道開(kāi)挖對(duì)地震動(dòng)分布的影響。為更好地理解開(kāi)挖對(duì)地震動(dòng)在地下開(kāi)挖邊界分布的影響,基于筆者提出的適于開(kāi)挖邊界的非線(xiàn)性速度模型及FLAC/SPECFEM2D的耦合數(shù)值模擬方法,針對(duì)高質(zhì)量及中等質(zhì)量圍巖體兩種情況,對(duì)一地下采場(chǎng)的地震動(dòng)分布進(jìn)行了數(shù)值分析。研究結(jié)果表明,不同速度模型對(duì)地震動(dòng)分布影響很大。考慮了圍壓及開(kāi)挖影響的非均勻速度模型能夠更好地模擬地震動(dòng)在地下開(kāi)挖邊界附近的分布,且模擬的地震動(dòng)在采場(chǎng)表面的放大作用與現(xiàn)場(chǎng)觀(guān)測(cè)的放大現(xiàn)象具有很好的一致性。相比于高質(zhì)量圍巖體,當(dāng)模擬的開(kāi)挖采場(chǎng)圍巖為中等質(zhì)量圍巖體時(shí),采場(chǎng)開(kāi)挖邊界處具有更強(qiáng)的地震動(dòng)及更廣的地震響應(yīng)。
[Abstract]:Ground motion plays an important role in the estimation of dynamic load in the design of dynamic load support of mine with impact tendency. At present, semi-empirical formula (scaling law) is widely used to estimate the peak vibration velocity of particle (PPV). At home and abroad. However, the influence of geology and roadway excavation on the distribution of ground motion is neglected in the actual estimation of ground motion. In order to better understand the influence of excavation on the distribution of ground motion in the boundary of underground excavation, based on the nonlinear velocity model proposed by the author and the coupled numerical simulation method of FLAC/SPECFEM2D, two kinds of surrounding rock mass with high quality and medium mass are considered. The distribution of ground motion in an underground stope is numerically analyzed. The results show that different velocity models have great influence on the distribution of ground motion. Considering the influence of confining pressure and excavation, the non-uniform velocity model can better simulate the distribution of ground motion near the boundary of underground excavation, and the magnification of simulated ground motion on the surface of stope is in good agreement with that of field observation. Compared with the high quality surrounding rock mass, when the simulated excavation surrounding rock is of medium mass, the excavation boundary of the stope has stronger ground motion and wider seismic response.
【作者單位】： 勞倫森大學(xué)Bharti工程學(xué)院;MIRARCO 采礦創(chuàng)新中心;
【基金】：加拿大安達(dá)略省研究基金(ORF)項(xiàng)目(No.SUMIT) 加拿大國(guó)家自然科學(xué)與工程研究項(xiàng)目(NSERC)(No.RGPIN/249620-2011)~~
【分類(lèi)號(hào)】：TD32

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