多因素耦合作用下的边坡滑动机理研究
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万宝矿产有限公司

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TD

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STUDY ON SLOPE SLIDING MECHANISM UNDER MULTI-FACTOR COUPLING
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Wanbao Mining Co,Ltd

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    摘要:

    为了探明刚果(金)卡莫亚铜钴矿南Ⅱ露天采场边坡滑动机理,以弹塑性有限元和强度折减为理论基础,采用有限元专业分析软件Phase2对卡莫亚南II露天边坡4个分区的代表性剖面进行了应力、渗流以及爆破振动力的多因素耦合分析。研究结果表明:(1)从现场踏勘结果来看,目前南II露天采场边坡除了东边坡局部有小型滑坡及北东角1480m平台第四系粘土层边坡开裂外,整体是稳定的。(2)以最终设计境界为基础建立的各分析模型应力分布以压应力为主,坡顶有少量拉应力产生;位移主要是向采坑临空面移动,坡脚坑底位移向上隆起,以水平位移为主,总位移较大处均位于坡体中部偏向坡脚位置;以剪切破坏为主,破坏区主要分布在坡顶及坡脚。(3)边坡的滑动机理为:在地下水和爆破的共同作用下,随着折减系数的增加,边坡坡顶和坡脚的剪切破坏区逐步向坡体内延伸,并在岩体强度低的砂砾岩体内或者砂砾岩和白云岩交界的位置贯通,此时边坡位移发生突变,边坡开始整体滑动;滑动模式为“圆弧滑动”或者“剪切作用下的圆弧-切层组合滑动”。(4)建议矿山在临近终了边坡处采取如预裂爆破等控制爆破技术措施,切实做好边坡的截排水措施。(5)以边坡稳定性研究结论为基础,对南II露天采场境界进行了优化调整,将原设计边坡角43°~45°提高到46°~50°,极大的减少了剥离量,取得了良好的经济效益。

    Abstract:

    In order to find out the sliding mechanism of south II open pit slope in Camoya copper and cobalt mine, Congo (Kinshasa), based on the elastic-plastic finite element method and strength reduction theory, the stress, seepage and blasting vibration force of four representative sections of open pit slope were analyzed by using the professional finite element analysis software Phase 2. The results show that: (1) According to the field survey results, the slope of south II open pit is stable, except for small landslides in the east slope and cracks in the quaternary clay slope of 1480m platform in the north-east corner. (2) Based on the ultimate design boundary, the stress distribution of each analysis model is mainly compressive stress, with a small amount of tensile stress at the top of the slope. The displacement mainly moves to the free face of the mining pit. The displacement of the bottom of the pit at the foot of the slope rises upward, with the horizontal displacement being the main one. The larger total displacement is located in the middle of the slope body, which is inclined to the foot of the slope. Shear failure is the main failure area. The failure area mainly distributes at the top and foot of the slope. (3) Under the combined action of groundwater and blasting, with the increase of reduction coefficient. The shear failure zone of the top and foot of the slope gradually extends into the slope body, and penetrates into the low-strength glutenite or the intersection of glutenite and dolomite. The displacement of the slope suddenly changes and the slope begins to slide as a whole. The sliding mode is "arc sliding" or "arc-shear combined sliding".(4) At the end of the slope, the control blasting measures should be carried out, such as pre-splitting blasting, to effectively cut off and drain the slope. (5) Based on the conclusion of slope stability study, the boundary of south II open-pit stope was optimized and adjusted. The original design slope angle was increased from 43~45 to 46~50 which greatly reduced the amount of stripping and achieved good economic benefits.

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  • 收稿日期:2019-05-31
  • 最后修改日期:2019-05-31
  • 录用日期:2019-06-08
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