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Simulation Study on Seismic Response of Ground Surface Above an Underground Longwall Goaf

机译：地下磨损地面地面抗震响应的仿真研究

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摘要

The dynamic varied elastic modulus and damping coefficient of underground goaf are most important factors which describes the goaf absorption ability on seismic wave energy. This numerical simulation study have focused on the effect of goaf area on earthquake-wave propagation and seismic response on the ground surface in a coal mine area. The laboratory measurements were carried out by 135 porous samples cases consisting rocks and coal particles 0.12-0.25 mm in size to estimate the dynamic elastic modulus and damping coefficient of the fragmented rock masses. In this simulation, a new model on damping coefficient of longitudinal and transverse waves has been presented in considering rock size (D), effective stress (sigma(e)), porosity (phi) and compaction time (t). The empirical correlation between the damping coefficient and effective stress (depth) as well as the compaction time of the goaf area has been derived and used for each goaf and strata grid blocks in the simulation. The results showed that the peak ground acceleration (PGA) above the goaf area exhibits 9-20% reduction compared to that of unexcavated condition (original coal seam), and around 10-35% seismic energy is trapped in the goaf area as goaf varied from 100 to 700 m. In the meantime, the peak ground displacement (PGD) is amplified up to seven times for the goaf depth ranging from 100 to 700 m compared to that of the unexcavated condition. Both PGA and PGD above goaf area are smaller than those above the undisturbed coal seam.
机译：地下GOF的动态变化弹性模量和阻尼系数是最重要的因素，描述了地震波能量上的GOF吸收能力。该数值模拟研究专注于GoF区域对煤矿区域地面地面地震波传播和地震反应的影响。实验室测量由135个多孔样品案例组成，组成岩石和煤颗粒0.12-0.25mm，以估计碎片岩体的动态弹性模量和阻尼系数。在该模拟中，考虑岩石尺寸（D），有效应力（Sigma（E）），孔隙率（PHI）和压实时间（T），已经提出了一种关于纵向和横波的阻尼系数的新模型。已经导出了阻尼系数和有效应力（深度）与有效应力（深度）之间的经验相关性，并用于模拟中的每个GOAF和地层网格块的GoAF区域的压实时间。结果表明，与未进射条件（原煤接缝）相比，GoAF区域上方的峰接地加速度（PGA）表现出9-20％，并且在GOF区域中捕获了大约10-35％的地震能量。从100到700米。与此同时，与未透明的条件相比，峰接地位移（PGD）高达七倍的GOAF深度范围为100至700米。 PGA和PGD上方GOF区域的均小于未受干扰的煤层上方的PGD。

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