College of Mining, Liaoning Technical University

为了研究车辆诱发的振动波对岩土质边坡动力响应特性的影响,以内蒙古元宝山露天煤矿内排土场为原型,借助MatDEM软件构建内排土场边坡动力响应模型,模拟了车辆激振边坡的过程,并从不同坡面、不同垂直距、不同水平距和同距不同角度等多方面分析了边坡在地震作用下的动力特性及动力响应规律。结果表明,震源激发的速度波呈圆弧传播,因波的多次反射和散射导致波场的无序;振动波传播越远,波扩散面越大,波动能量越分散,土体振动的起始时间越晚,振幅和频率越小,表现为土体振动越简单,距震源3~6m范围内的动力响应较大;途中遇到的土密实度越大,波损程度则越大;振动波在狭窄界面具有聚波的放大效应,在开阔界面具有散波的缩小效果。

In order to study the effect of vehicle - induced vibration waves on the dynamic response characteristics of geotechnical slopes, the inner dump of Yuanbaoshan Open - pit Mine in Inner Mongolia was taken as the prototype, and MatDEM software was used to construct a dynamic response model of the inner dump slope. The process of vehicle induced vibration of the slope was simulated, and the dynamic characteristics and response laws of the slope under seismic action from various aspects such as different slope surfaces, different vertical distances, different horizontal distances, and different angles at the same distance. The results indicate that, the velocity waves generated by the seismic source propagate in a circular arc, resulting in wave field disorder due to multiple reflections and scattering of the waves. The amplitude and frequency of wave propagation are mainly affected by wave propagation distance and soil compactness. The farther the vibration wave propagates, the larger the wave diffusion surface, the more dispersed the fluctuation energy, the later the onset of soil vibration, the smaller the amplitude and frequency, the simpler the soil vibration, and the larger the dynamic response within 3-s6 m from the source. The greater the density of the soil encountered on the way, the greater the degree of wave damage. Seismic waves have the amplification effect of converging waves at narrow interfaces and the reduction effect of scattered waves at open interfaces.

国家自然科学基金项目(51974144);辽宁省教育厅项目(LJ2020FWL006);辽宁工程技术大学学科创新团队项目(LNTU20TD-07)

朱永东, 刘光伟. 车辆荷载作用下露天煤矿内排土场动力响应特征 [J]. 煤炭工程, 2023, 55(9): 151-157.