软弱基底排土场堆载过程中稳定性数值模拟

发布时间：2018-04-28 22:18

本文选题：排土场 + 软弱基底　；参考：《防灾减灾工程学报》2017年05期

【摘要】：针对软弱基底排土场普遍存在稳定性差的问题,在分析了排土场失稳的主要影响因素以及常见的5种失稳模式的基础上,结合胜利东二露天煤矿南排土场南帮边坡工程地质实际,基于强度折减理论,运用大型岩土数值模拟软件FLAC3D对排土场逐水平堆载过程中基底与边坡岩体变形破坏规律及稳定性进行了数值模拟分析,确定了南排土场南帮边坡的破坏模式以及最终排弃高度。结果表明:胜利东二露天矿南排土场边坡变形破坏主要受排弃物料重力影响,随着排弃高度的增加,基底内部第四系弱层最大位移呈线性增加,弱层以下岩土体变形量较小,其滑坡模式为沿基底内部弱层发生的剪切圆弧滑动,可在原设计基础之上继续排弃一个排土台阶高度,提高了排土场的空间利用率,并为类似排土场边坡设计提供借鉴。
[Abstract]:In view of the problem of poor stability in the dump with weak foundation, the main influencing factors of the instability of the dump and the five common instability modes are analyzed. Combining with the engineering geological practice of the south side slope of the south dump of Shengli Donger opencast coal mine, based on the theory of strength reduction, The deformation and failure law and stability of the basement and slope rock mass during the horizontal loading process of the dump are simulated and analyzed by using the large-scale geotechnical numerical simulation software FLAC3D, and the failure mode and the final dumping height of the south side slope of the south dump are determined. The results show that the deformation and failure of the slope in the south dump of Shengli East No.2 Open-pit Mine is mainly affected by the gravity of the discharged material. With the increase of the discharging height, the maximum displacement of the Quaternary weak layer in the basement increases linearly, and the deformation of the rock and soil below the weak layer is relatively small. The landslide model is a shear arc sliding along the weak layer inside the basement, which can continue to discard a dump step height on the basis of the original design, improve the space utilization ratio of the dump, and provide a reference for the slope design of similar dump.
【作者单位】：辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金项目(51104084,51474119);国家自然科学基金重点项目(U1361211) 高等学校博士学科点专项基金项目(20122121110003)资助
【分类号】：TU43

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