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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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本文研究了边坡稳定的影响因素,用极限平衡法结合具体工程分析了边坡的稳定性。研究表明:影响边坡稳定的因素较多,可归纳为内外因素综合作用的结果;极限平衡法所得到的结果比较满意。 相似文献
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本文意用(英)HOEK《岩石边坡工程》一书的主要观点,利用微型计算机,将实楔形体稳定性的定量分析法扩拓到虚楔形体稳定性分析之中。结合攀矿兰山采场边坡实际,系统地阐明了对岩质边坡中节理、裂隙(统称结构面)的有效研究方法,试探讨了虚楔形体定量分析的问题;对从事边坡工作的现场人员有一定参考价值。 相似文献
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本文在使用各种极限平衡方法对某露天矿边坡的稳定性进行分析的基础上,根据概率统计原理,对便用不同计算方法所得到的结果进行概率计算与分析,从而对各种计算方法进行了评价。指出,在使用极限平衡方法分析冶金矿山岩石边坡的稳定性时,分块极限平衡法、水平投影法和萨尔玛法较其它方法更符合实际。 相似文献
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本文研究了边坡稳定性的分析方法,研究表明:边坡稳定分析方法主要分为定性分析法和定量分析法。边坡稳定的定性分析法主要有地质历史力学法、工程经验类比法和图解法等;边坡稳定的定量分析法主要包括极限平衡法、有限单元法、能量平衡法、控制理论分析法、智能技术分析法以及综合分析法。各种方法都有它的适用范围和利弊,在具体工程中应该综合各种边坡稳定分析方法的利弊来进行选择分析。 相似文献
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提出了一种基于有限元弹塑性应力场和极限平衡状态的三维边坡稳定分析方法——三维有限元极限平衡法。首先,考虑三维空间中滑动方向,提出滑动面上一点在滑动方向上的极限平衡条件,并证明滑动面上土体整体达到极限平衡状态与滑动面上土体各处在滑动方向上处于极限平衡状态等价。再通过刚体极限平衡假定计算主滑方向和滑动面上各点滑动方向。最后,定义局部安全系数为抗剪强度与滑动方向上剪应力投影的比值,基于三维边坡整体极限平衡条件将局部安全系数通过积分中值定理转变为整体安全系数。该方法计算简单,消除了剪应力比形式定义安全系数滑动面形状限制,具备合理性与有效性。算例验证结果表明,该方法滑动方向假设合理,安全系数与严格三维极限平衡法结果一致。 相似文献
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Conventional limit equilibrium methods are commonly used to assess the stability of embankments. The finite-element method, as an alternative to limit equilibrium methods, is being increasingly used in the deterministic stability analysis of slopes or embankments. In this paper, a practical procedure for integrating the finite-element method and the limit equilibrium methods into probabilistic stability analysis for embankments is presented. The response surface method is adopted to approximate the performance function for the stability problems and the first-order reliability method is used to calculate the reliability index based on an intuitive expanding ellipsoid perspective. The advantages of the response surface method as a bridge between stand-alone numerical packages and spreadsheet-based reliability analysis via automatic constrained optimization are demonstrated and discussed through a hypothetical two-layer slope and an actual case of the James Bay Dykes. The results show the ease and successful implementation of the proposed procedure for reliability analysis of embankments. 相似文献
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考虑传统的极限平衡法和FLAC二维非线性数值分析方法的优缺点,将边坡稳定性分析的Slide极限平衡法和FLAC2D强度折减法相结合,以某排土场为工程实际,进行了边坡在天然、天然地震、降雨和降雨地震四种不同工况下的稳定性验算比较;鉴于影响边坡稳定因素的不确定性,采用基于Spencer法的Mont-Carlo法进行了边坡可靠度指标的计算,并对强度参数C、(φ)和容重γ对边坡稳定的影响进行了分析,得出边坡稳定对内摩擦角(φ)的敏感性高于内聚力C的敏感性,而容重γ的影响较C、(φ)可忽略不计.该方法通过两者的相互校核,不仅给出边坡非线性应力-应变关系和安全系数来共同评价边坡的稳定性,而且结合排土场边坡安全系数的概率分析提供边坡潜在的失效概率使边坡稳定性评价更加科学、精确. 相似文献
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金堆城钼矿排土场稳定性分析与研究 总被引:2,自引:0,他引:2
通过采用有限元计算法及极限平衡计算法.对金堆城钼矿排土场典型边坡地段稳定性进行分析与研究,揭示出两个排土场不同地段边坡稳定状态,并采取相应不同的预防和治理措施。 相似文献
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Stability Analysis of Complex Soil Slopes using Limit Analysis 总被引:2,自引:0,他引:2
The limit equilibrium method is commonly used for slope stability analysis. Limit equilibrium solutions, however, are not rigorous because neither static nor kinematic admissibility conditions are satisfied. Limit analysis takes advantage of the lower- and upper-bound theorems of plasticity theory to provide rigorous bounds on the true solution of a stability problem. In this study, finite-element models are used to construct both statically admissible stress fields for lower-bound analysis and kinematically admissible velocity fields for upper-bound analysis of soil slopes. While limit analysis of relatively simple slopes, typically homogeneous and of simple geometry, has been done previously, limit analysis of slopes with complex geometries, soil profiles, and groundwater patterns could not be effectively done in the past. In this paper, the theoretical basis and procedure for limit analysis of such slopes is presented. Various examples of slopes are selected from the literature and analyzed using both limit equilibrium and limit analysis. Factors of safety from limit equilibrium and limit analysis are compared. A comparison is also made, for each example, between the critical slip surfaces from limit equilibrium with the velocity field and plastic zone from the upper-bound solution and with the stress field from the lower-bound solution. 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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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