诸极限平衡方法安全系数的概率计算与分析

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。     

基于极限平衡法与强度折减法的边坡稳定性分析

为研究某矿露天采场边坡的安全性与稳定性,根据三维建模资料,开展现场实际调查,对露天边坡稳定性计算坡面进行选取,分别利用极限平衡法与有限元强度折减法对边坡的稳定性进行了计算分析,并根据计算分析结果对边坡的稳定状态进行了评价。     

科卡金矿高边坡稳定性分析

针对厄立特里亚的科卡露天金矿边坡工程的稳定性进行分析,选取了代表性的三个剖面,采用极限平衡法和有限元强度折减法进行计算。结果表明:极限平衡法计算得到的三个剖面中最小的安全系数为1.46,而有限元强度折减法获得最小安全系数为1.45。安全系数均满足国家技术规范要求,初步设计的露天矿边坡处于稳定状态。     

基于参数反分析法的露天开采边坡稳定性分析

在边坡稳定性分析中,岩土物理力学参数是影响分析计算结果的一个重要因素。针对试验力学参数离散性大的问题,以德兴铜矿富家钨露天开采边坡工程为背景,对试验所获取的力学参数进行了反算,然后根据这些参数分别运用极限平衡法和有限元强度折减法对边坡在天然、饱水、爆破等工况下进行数值模拟计算,并综合考虑裂隙、岩性等因素对边坡作出稳定性评价。结果表明,边坡在局部地方可能发生失稳破坏,这也验证了参数反算结果的准确合理性且与工程实际相符。     

排土场边坡稳定性有限元法研究及应用

本文从排土场边坡岩石破坏模型入手，考虑到排土场形成的模拟，地震效应以及地下水的力学作用，采用弹塑性有限元分析方法对其边坡稳定性进行分析研究，并引入抗煎破坏安全度的概念，对边坡稳定性进行评价。应用于南芬铁矿庙儿沟排土场边坡稳定性研究，其计算结果与极限平衡分析结果进行了比较，取得了良好效果，表明该人有广泛的应用前景。     

攀钢营盘山高陡边坡稳定性极限平衡综合评价

针对营盘山高陡边坡工程地质条件实际，根据控制边坡稳定性的不同边界条件，采用极限平衡法，从平面、空间角度对边坡稳定性进行了定量计算，并综合分析、评价了优化后的边坡境界方案。     

某磷矿边坡稳定性分析与整治

边坡稳定是露天矿山的主控工程之一,而影响边坡稳定的因素是错综复杂的。某磷矿从宏观到微观、从内因到外因分析了边坡失稳的主要原因;采用极射赤平投影法和极限平衡法分别对边坡的稳定性进行了定性分析和定量计算,对其所处的稳定状态作出了科学的判断;并采取相应的措施对不稳定边坡进行整治,收到了良好的效果。     

金堆城钼矿排土场稳定性分析与研究

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。     

边坡稳定性分析中极限平衡法、三维有限元法和离散元法的联合应用研究

利用极限平衡法、三维有限元法和离散元法对嵩明一待朴高速公路K83 480～800路段边坡稳定性进行了计算机模拟及计算分析。这三种方法各有优缺点，联合应用可互为补充，最后得出结果与实际情况比较吻合，为以后的边坡稳定性分析工作提供了借鉴经验。     

岩全工程系统破坏失稳的能量突变准则

本文在明确区分了岩石材料破坏与岩石工程系统失稳破坏不同含义的基础上，提出用数据计算模拟地下岩石开挖工程和实际工程设计中，不应简单地将岩石材料的破坏与岩石工程系统的破坏用同样的破坏准则加以判断，文中运用系统能量的原理，借助突变理论的方法推导出岩体工程开挖系统失稳破坏的能量突变准则，并将其引入进有限元数值计算中去判断岩体工程系统失稳的可能性，通过工程实例分析，证明所提出了观点和判断准则是正确的，具有一     

强度折减法在某尾矿坝边坡稳定性分析中的应用

利用有限元强度折减法对某尾矿坝的边坡稳定性进行了计算,同时利用简化毕肖普法和瑞典圆弧法对该坝体的边坡稳定性进行了计算。通过对比分析,有限元强度折减法的计算值与考虑条块间作用力的简化毕肖普法的计算值基本一致,证明基于有限元理论的强度折减法的计算结果是合理的,其安全系数值可以作为该尾矿工程定量判断的依据。     

Probabilistic Slope Stability Analysis by Finite Elements

In this paper we investigate the probability of failure of a cohesive slope using both simple and more advanced probabilistic analysis tools. The influence of local averaging on the probability of failure of a test problem is thoroughly investigated. In the simple approach, classical slope stability analysis techniques are used, and the shear strength is treated as a single random variable. The advanced method, called the random finite-element method (RFEM), uses elastoplasticity combined with random field theory. The RFEM method is shown to offer many advantages over traditional probabilistic slope stability techniques, because it enables slope failure to develop naturally by “seeking out” the most critical mechanism. Of particular importance in this work is the conclusion that simplified probabilistic analysis, in which spatial variability is ignored by assuming perfect correlation, can lead to unconservative estimates of the probability of failure. This contradicts the findings of other investigators who used classical slope stability analysis tools.     

Observations on Limit Equilibrium–Based Slope Reliability Problems with Inclined Weak Seams

This study addresses the complexity of slope reliability problems based on limit equilibrium methods (LEMs). The main focus is on the existence of multiple failure modes that poses difficulty to many LEM-based slope reliability methods. In particular, when weak seams are present, the failure modes associated with those seams may be difficult to detect. A systematic way of searching the failure modes is proposed, and its robustness over slopes with or without weak seams is demonstrated. It is found that in the presence of weak seams, assuming circular slip surfaces may cause underestimation of slope failure probability. The conclusion of the study promotes the use of finite elements as the stability method for reliability evaluation because it is not necessary to search for failure surfaces in finite-element stability analysis.     

仓上金矿-82m至-178m下盘东部边坡稳定性及工程处理评价

文中以工程地质、水文地质、岩体物理力学性质以及爆破振动影响边坡破坏模式调查所获得的大量实际资料为基础,通过对边坡的多种岩体的物理力学性质、破坏模式以及多种影响因素的综合分析,正确选用符合的力学参数和几何参数,经过稳定性计算最终给出表征边坡稳定程度的定量指标。并以此为基础,设计出切实可行的综合防治边坡岩体滑落的措施。而后,付诸工程实践中,达到运输公路安全的预期目的。     

基于动态权重的边坡稳定性评价方法

为了保证露天矿边坡的稳定性,提高开采的安全性,减少人身财产损失,针对边坡稳定性存在的模糊不确定性和层次性的特点,采用模糊数学方法,建立边坡稳定性模糊综合评价模型。通过实地走访结合文献总结,选用5个影响因素及其对应的18个影响因子,集成误差传递原理、相似性和差异性分析以及区间数矩阵相对优势度分析建立动态权重。研究结果表明：该模型得到的结果能较准确地反映边坡的稳定程度,评价结果与实际结果相吻合,为边坡稳定性评价提供了一种可行的方法。     

Stability Analysis of Strain-Softening Slope Reinforced with Stabilizing Piles

Stabilizing piles have been used extensively over the past few decades to support unstable slopes. A new simplified method is described to analyze the stability level of a strain-softening slope reinforced with stabilizing piles. An equivalent principle is proposed to account for the three-dimensional effect of the piles on the stability level of slopes. The formulation is derived on the basis of the displacement distribution assumptions of the slope by extending the simplified Bishop slice method. The parameters can be easily determined by element tests. This method is used on a real-world slope to discuss the influential factors. The results show that the slope geometry and pile layout, which includes pile spacing, pile location, and pile depth, have a significant effect on the safety factor and critical slip surface of the reinforced slope. The stability level of a strain-softening slope is dependent not only on the strength parameters but also on the stress-strain relationship of soil.     

Prediction of Velocity and Deformation Fields During Multipass Plate Hot Rolling by Novel Mixed Analytical-Numerical Method

 An integrated mathematical model is proposed to predict the velocity field and strain distribution during multi-pass plate hot rolling. This model is a part of the mixed analytical-numerical method (ANM) aiming at prediction of deformation variables, temperature and microstructure evolution for plate hot rolling. First a velocity field with undetermined coefficients is developed according to the principle of volume constancy and characteristics of metal flow during rolling, and then it is solved by minimizing the total energy consumption rate. Meanwhile a thermal model coupling with the plastic deformation is exploited through series function solution to determine temperature distribution and calculate the flow stress. After that, strain rate field is calculated through geometric equations and strain field is derived by means of difference method. This model is employed in simulation of an industrial seven-pass plate hot rolling process. The velocity field result and strain field result are in good agreement with that from FEM simulation. Furthermore, the rolling force and temperature agree well with the measured ones. The comparisons verify the validity of the presented method. The calculation of temperature, strain and strain rate are helpful in predicting microstructure. Above all, the greatest advantage of the presented method is the high efficiency, it only takes 12 s to simulate a seven-pass schedule, so it is more efficient than other numerical methods such as FEM.     

Study on Extracting Rare Earth from Sulfate System by Long-Chain Fatty Acid

The extraction of rare earths by long-chain fatty acid in kerosene from sulphate system was described.It was demonstrated from the experimental results that the ratio of kerosene: fatty acid: isooctanol = 55 : 30: 15 ( V/V),By the saturation capability method and the slope method, the extracted reaction mechanism of the extraction of rare earth was studied.It is shown that the extraction reaction conform to the cation exchange reaction mechanism.The extracted sequence of rare earth was determined in this system and it is shown that there is no tetrad effect and the position of yttrium is between lanthanum and cerium.     

Stable Boundary Element Method/Finite Element Method Procedure for Dynamic Fluid–Structure Interactions

The stability problem has prevented the application of the boundary element method/finite element method (BEM/FEM) coupling procedure in dynamic fluid–structure interaction problems for the last 2 decades. It has been proved that the linear θ method can make a significant stability improvement for the time domain BEM scheme. With the use of the linear θ method, the BEM/FEM coupling procedure is applied to two-dimensional time domain fluid–structure interaction problems. The fluid domain is acoustic and modeled by taking advantage of the BEM scheme that is suitable to either finite or infinite domains. An internal source has been considered in BEM formulations, and no artificial boundary needs to be introduced for the infinite domain. The structure is modeled by finite elements that can be either linear or nonlinear. Two classical examples are given to show the validity of the coupling procedure in fluid–structure interaction problems and the significant stability improvement given by the linear θ method to the BEM/FEM coupling procedure.