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以江西城门山铜矿城门湖区软基土石坝为研究对象,基于淤泥流动过程中的冲击力特性,采用FLAC3D程序模拟和分析了淤泥冲击挤压作用下软基土石坝的水平速率、水平位移和剪应变等动态响应。研究结果表明:(1)坝体速率变化规律与冲击挤压作用周期基本一致。坝体监测点速率大小及发生运动的区域均随时间增加而增大。约在0.3 s(1/2周期)时,速率达到最大值;而约在0.45 s(3/4周期)时,发生运动的区域达到最大;之后随着冲击荷载的衰减坝体质点逐渐趋于静止。(2)淤泥冲击挤压作用下坝体发生了永久位移,平均位移值约30 mm,可看作坝身整体向下游侧移动了30 mm。(3)坝体内形成了一条明显的剪应变增量贯通带,发生区域位于上层软土坝基内,表明坝体最可能沿此位置发生整体滑动失稳破坏。
Taking soft soil foundation rockfill dam of Chengmenshan Copper Mine in Chengmenshan Copper Mine of Jiangxi Province as the research object, the FLAC3D program was used to simulate and analyze the horizontal velocity and the horizontal velocity of the soft-rock embankment dam under the action of silt impact and extrusion based on the impact characteristics in the process of silt flow. Displacement and shear strain and other dynamic response. The results show that: (1) The variation of dam body velocity is consistent with the period of impact extrusion. The rate of dam monitoring area and the area of motion increased with time. At about 0.3 s (½ cycle), the velocity reached a maximum, while at about 0.45 s (¾ cycle), the area where motion occurred reached the maximum; then the body mass gradually became lower as the impact load attenuated still. (2) The displacement of the dam under the action of silt impact is about 30 mm. The displacement of the dam body is about 30 mm. (3) A clear increment of shear strain increment is formed in the dam body. The occurrence zone is located in the soft soil foundation of the upper layer, indicating that the dam body is most likely to have the entire sliding instability damage along this location.