曹博;黄云龙;张院生;汪帅;刘士晨;刘光伟;

• 1:辽宁工程技术大学矿业学院
• 2:中国铁道科学研究院(深圳)研究设计院有限公司

摘要(Abstract)：

为了揭示承载河道下高大内排土场的蠕变沉降规律，以某露天煤矿内排土场为研究对象，结合排土场回填体的三轴蠕变试验和地表沉降监测，反演排土场碾压区砂砾石土和非碾压区细粒土质砂的蠕变参数，建立了内排土场边坡三维模拟数值模型。Burgers黏弹性蠕变模型模拟结果表明：内排土场碾压区和非碾压区2020—2029年的蠕变沉降和水平变形均达到收敛状态，经历了初期加速蠕变、中期减速蠕变和后期收敛蠕变3个阶段；蠕变沉降量随距坡肩距离增大而减小，碾压区河道外侧边界正下方及碾压区与非碾压区分界位置2个监测点的蠕变沉降收敛于0.33 m和0.40 m,沉降变形量小且近似均匀，对河道运营和坝体安全的影响较小；非碾压区坡肩处2020—2029年竖直和水平蠕变量为7.43 m和8.92 m,最大蠕变发生在非碾压区中部及中上部台阶处，是回填土蠕变滑坡的重点监测和预防区域。通过建立排土场沉降蠕变理论模型，得到了填方土蠕变沉降方程和下沉速度系数，理论模型与数值模拟的蠕变沉降量具有较好的一致性，验证了数值模型的合理性。

关键词(KeyWords)： 安全工程;内排土场;蠕变阶段;蠕变模型;数值模拟;反演分析

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51974144)

作者(Authors): 曹博;黄云龙;张院生;汪帅;刘士晨;刘光伟;

DOI: 10.13637/j.issn.1009-6094.2021.0128

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