地震动在地下采场开挖边界的耦合数值分析
发布时间：2018-08-15 18:18
【摘要】：在具有冲击倾向性矿井的动载支护设计中,地震动对动态载荷的估算有重要作用。目前,国内外普遍采用半经验公式(scaling law)来估算质点峰值振动速度(PPV)。然而,此方法在实际估算地震动时忽略了地质和巷道开挖对地震动分布的影响。为更好地理解开挖对地震动在地下开挖边界分布的影响,基于笔者提出的适于开挖边界的非线性速度模型及FLAC/SPECFEM2D的耦合数值模拟方法,针对高质量及中等质量围岩体两种情况,对一地下采场的地震动分布进行了数值分析。研究结果表明,不同速度模型对地震动分布影响很大。考虑了围压及开挖影响的非均匀速度模型能够更好地模拟地震动在地下开挖边界附近的分布,且模拟的地震动在采场表面的放大作用与现场观测的放大现象具有很好的一致性。相比于高质量围岩体,当模拟的开挖采场围岩为中等质量围岩体时,采场开挖边界处具有更强的地震动及更广的地震响应。
[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.
【作者单位】： 劳伦森大学Bharti工程学院;MIRARCO 采矿创新中心;
【基金】：加拿大安达略省研究基金(ORF)项目(No.SUMIT) 加拿大国家自然科学与工程研究项目(NSERC)(No.RGPIN/249620-2011)~~
【分类号】：TD32
本文编号：2185016
[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.
【作者单位】： 劳伦森大学Bharti工程学院;MIRARCO 采矿创新中心;
【基金】：加拿大安达略省研究基金(ORF)项目(No.SUMIT) 加拿大国家自然科学与工程研究项目(NSERC)(No.RGPIN/249620-2011)~~
【分类号】：TD32
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