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三峡库区微震级低烈度地震频发,但相关研究较少,因此以三峡库区白家包滑坡为研究对象,耦合运用Geo-Studio中Quake、Seep、Slope模块模拟分析该滑坡频发微震下的动力响应情况。结果表明,由于能量传输耗能,后缘记录点位移小于前缘,且由于表层放大效应,上部记录点位移大于下部;滑坡整体呈现出不同程度的加速度放大作用,且前缘整体放大倍数大于后缘,表层大于内部,与动态位移分析一致;滑坡仅175m水位附近发生微弱液化,随着地震的持续,液化区沿滑体表面向下蔓延扩大,其他位置滑面无液化迹象,因此考虑不同因素的两种Quake应力法稳定系数时程曲线完全一致,且当滑面平均加速度大于临界值时,稳定系数小于1,由于地震持时较短,不会整体失稳,仅发生不可逆累进塑性变形。
Therefore, taking the Baijiabao landslide in the Three Gorges reservoir area as the research object, the Quake, Seep and Slope modules in Geo-Studio are used to simulate and analyze the micro-earthquakes caused by frequent landslides The dynamic response. The results show that the displacements at the trailing edge are smaller than those at the leading edge because of energy dissipation and the displacement of the upper recording point is larger than that at the lower part because of the amplification effect of the surface layer. The whole landslide shows different degree of acceleration amplification, And the surface is larger than the interior, which is consistent with the dynamic displacement analysis. The weak liquefaction occurs only in the vicinity of 175m water level. As the earthquake persists, the liquefied zone spreads downwards along the surface of the slide and no signs of liquefaction occur in other positions. Therefore, The stability curves of the two Quake stress methods are exactly the same. The stability coefficient is less than 1 when the average acceleration of the sliding surface is larger than the critical value. Because of the short duration of the earthquake, the overall instability will not occur and irreversible progressive plastic deformation will occur.