共查询到19条相似文献,搜索用时 125 毫秒
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露天矿山边坡稳定性是矿山安全生产的主要影响因素之一。针对长山壕金矿东露天采场逐渐转入深部开采后出现的多处区域不同规模的滑坡及不稳定现象,对原东露天采场境界进行重新圈定,并对重新圈定的露天境界边坡进行了稳定性分析。详细介绍了东露天采场境界方案比选、道路参数的选择与设置、露天境界的重新圈定及边坡稳定性分析等。结果表明,优化后的露天境界边坡整体处于稳定状态,满足安全生产要求。 相似文献
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露天边坡角的大小对矿山边坡稳定及开采成本有着重要影响,合理的边坡角是保证露天采场安全、经济回采的重要因素。本文以卢安夏铜矿穆利亚希南矿区为背景,应用 Geo-Slope 软件在考虑地震影响因素下使用极限平衡法中的 Ordinary 法、Bishop 法、Janbu 法及 Morgenstern-Price 法对穆利亚希南矿区一区和二区不同角度的露天边坡稳定性进行分析,结果表明 :当一分区的边坡角为 40°,二分区的边坡角为 39°时,边坡最为稳定,能保证工作平台安全生产。研究成果可为卢安夏其它露天矿边坡稳定性分析提供借鉴。 相似文献
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露天矿边坡的稳定是矿山安全生产的保证.某铜钼露天矿东侧边坡690 m台阶面上已形成一个长52 m的塌陷坑,690~678 m台阶花岗斑岩和长英质角岩较破碎,坡面风化较严重,发生坍塌滑坡,影响矿山正常的采矿进程和采场内作业人员的安全.通过分析该矿边坡失稳影响因素及治理对策,指出边坡失稳破坏是多种因素共同作用的结果,并提出... 相似文献
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对露天矿山边坡稳定性影响因素从内外因两个方面进行分析,总结了极限平衡法、基于FLAC3D强度折减的有限差分法和基于强度折减的有限元法等3种常用的边坡稳定性分析方法,提出了加强地质勘查、做好安全监测、合理确定台阶要素和选择爆破方法、削坡减压和减重压脚、加强边坡检查与管理等治理边坡滑动灾害的控制措施。研究结果对露天矿山的安全生产及预防和控制边坡失稳具有一定的指导意义。 相似文献
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本钢南芬露天铁矿产生大规模边坡滑体,威胁了矿山采场生产人员和设备的安全,极大地影响了矿山的正常生产,保成了本钢南芬露天铁矿新一轮的边坡稳定性研究,本文正是在这一背景下,对本钢南芬露天铁矿的地质概况、生产概况和边坡滑体产生的现状进行了浅要介绍,然后通过对局部边坡岩体的岩性、构造、岩层产状等的地质调查和岩移监测结果分析,得出影响露天矿边坡稳定,并产生边坡滑体的主要原因是:岩体的岩性及结构特征、爆破震动、雨水渗透和生产中的人为因素。最后提出露天矿边坡稳定研究的防治工作的几点建议:建立边坡稳定技术研究机构和专职边坡施工维护队伍、防水排水、加固整治、岩移监测和控制爆破。 相似文献
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根据露天矿山的生产工艺特征,将岩质边坡划分为总体边坡、路间边坡和台阶边坡三种尺度,并对其控制因素、破坏模式进行了分析;结合土木工程边坡规范和非煤露天矿山边坡规范的边坡设计安全系数取值,讨论了国内外非煤露天矿山边坡设计安全系数的要求,提出了六条建议;综合考虑服务年限、边坡尺度规模的设计安全系数改进方案,并引入失稳概率,拓展了不同尺度边坡稳定性评价的设计标准,可有效提升非煤露天矿岩质边坡稳定性评价的合理性和科学性,进一步完善了矿山边坡设计理论和方法。 相似文献
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露天边坡稳定性受岩性、岩体结构、水文地质、边坡形态和爆破等多种因素影响。露天矿常见的边坡失稳,滑坡等地质灾害直接威胁露天采场的正常生产。为研究银山矿现有边坡的稳定性,建立了Dimine软件三维模型,采用工程地质分区、极限平衡法分析边坡各种破坏模式下的受力状态,以边坡滑体上的抗滑力和下滑力之间的关系评价边坡的稳定性,分析结果表面银山矿总体边坡较稳定,南部后续开采过程中需加强现场巡视与边坡监测,及时消除安全隐患。 相似文献
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为了更加快捷、高效地判定边坡稳定与否,基于机器学习,融合主成分分析法(PCA)、参数调整、影响因素权重分析等,建立了一种边坡安全稳定性评价体系。研究发现,运用PCA可以在保留80%数据原信息的前提下将输入变量维度从六维降至三维,但此时模型效果有所下降;随机森林及梯度提升(XGBoost) 两种学习算法均可搭建有效的边坡安全稳定性评估模型,通过对其预测效果的对比分析,确定XGBoost为最佳评价模型。与此同时,采取卡方检验、F检验以及互信息法3种相关性检验手段,并通过计算评价因子的重要程度且加以可视化展示,明确了容重、坡高、内摩擦角以及内聚力4个内在因素的重要性,最终将评估结果与实际结合提出了边坡安全防护措施。 相似文献
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Classical limiting equilibrium analysis seeks the minimum factor of safety and its associated critical slip surface. This objective is mathematically convenient; however, it limits the analysis' practical usefulness. Introduced is a general framework for safety maps that allow for a physically meaningful extension of classical slope stability analysis. Safety maps are represented by a series of contour lines along which minimal safety factors are constant. Each contour line is determined using limit equilibrium analysis and thus represents a value of global safety factor. Since most problems of slope stability possess a flat minimum involving a large zone within which safety factors are practically the same, representation of the results as a safety map provides an instant diagnostic tool about the state of the stability of the slope. Such maps provide at a glance the spatial scope of remedial measures if such measures are required. That is, unlike the classical slope stability approach that identifies a single surface having the lowest factor of safety, the safety map displays zones within which safety factors may be smaller than an acceptable design value. The approach introduced results in a more meaningful application of limiting equilibrium concepts while preserving the simplicity and tangibility of limit equilibrium analysis. Culmann's method is used to demonstrate the principles and usefulness of the proposed approach because of its simplicity and ease of application. To further illustrate the practical implications of safety maps, a rather complex stability problem of a dam structure is analyzed. Spencer's method using generalized slip surfaces and an efficient search routine are used to yield the regions within the scope where the safety factors are below a certain value. 相似文献
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The performance of a slope, such as surviving a certain groundwater condition, can be viewed as the outcome of a full-scale test performed directly on the slope and may provide valuable information for safety assessment, upgrading analysis, and repair design of the slope. Performance information can be divided into two types: (1)?the slope survived a certain state, and (2)?the slope failed at a certain state. This paper illustrates two methods for slope reliability analysis considering site-specific performance information, i.e., an indirect method based on back-analysis of the performance information, and a direct method, in which the back-analysis procedure is bypassed. The two methods are theoretically the same but different in implementation details. As examples, an existing slope for safety assessment and a failed slope to be repaired are studied in this paper. Considering the past survival information increases the reliability of the slope. The increase in reliability is larger if the slope survives a more critical state. Thus, ignoring the survival information may result in uneconomical decisions. In contrast, ignoring the failure information may either underestimate or overestimate the reliability of a slope. As a result, neglecting the past failure information may lead to unsafe or uneconomical decisions. 相似文献
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预应力锚索作为高危边坡加固的一种有效措施,在各种边坡工程建设中得到了广泛的应用。本文首先阐述了道路工程高路堑边坡预应力锚索施工的工艺特点、施工工艺及施工要点,提出了常见问题的处理措施。基于锚索预应力损失问题是关系到锚固工程安全与否的重要因素,随后对预应力锚索加固边坡的机理、锚索预应力损失的影响因素及其应对方法进行了探讨,提出了应力补偿的措施。 相似文献
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Quentin B. Travis Sandra L. Houston Fernando A. M. Marinho Mark Schmeeckle 《Canadian Metallurgical Quarterly》2010,136(7):963-974
A slope stability model is derived for an infinite slope subjected to unsaturated infiltration flow above a phreatic surface. Closed form steady state solutions are derived for the matric suction and degree of saturation profiles. Soil unit weight, consistent with the degree of saturation profile, is also directly calculated and introduced into the analyzes, resulting in closed-form solutions for typical soil parameters and an infinite series solution for arbitrary soil parameters. The solutions are coupled with the infinite slope stability equations to establish a fully realized safety factor function. In general, consideration of soil suction results in higher factor of safety. The increase in shear strength due to the inclusion of soil suction is analogous to making an addition to the cohesion, which, of course, increases the factor of safety against sliding. However, for cohesive soils, the results show lower safety factors for slip surfaces approaching the phreatic surface compared to those produced by common safety factor calculations. The lower factor of safety is due to the increased soil unit weight considered in the matric suction model but not usually accounted for in practice wherein the soil is treated as dry above the phreatic surface. The developed model is verified with a published case study, correctly predicting stability under dry conditions and correctly predicting failure for a particular storm. 相似文献