基于Geo-slope软件对某高边坡的稳定性分析与评价

通过Geo-slope软件,运用极限平衡理论对高边坡稳定性进行稳定性分析,模型计算结果显示边坡是稳定的。并结合边坡场地处的实际情况,提出对边坡治理的措施和建议。     

白云鄂博铁矿东矿边坡稳定性研究

针对白云鄂博铁矿东矿C区边坡产生的3处不稳定滑体,结合现场工程地质勘察和岩石力学试验,采用理正岩土分析软件5.5版及加拿大岩质边坡稳定性分析计算软件SLIDE5.0对削坡、锚索加固、注浆的二次加固措施进行了分析计算,通过计算得到的安全系数来综合判断该二次加固措施的有效性。分析计算结果表明,通过削坡、锚索加固、注浆的加固措施,可以使白云鄂博铁矿东矿C区边坡最危险滑面的安全系数达到1.186,符合设计边坡稳定安全系数要求。文章最后提出了实施这些措施时的注意事项。     

尾矿库中后期坝体稳定性计算分析

尾矿库坝体存在溃坝危险,所以尾矿库是一座重大危险源,在国际灾害事故排名中位列第18位。可见,对尾矿库坝安全进行研究,并加强监管和监控,对于防止尾矿库事故的发生,保证尾矿库安全运行是极其重要。本文采用MIDAS岩土工程分析软件,对元江尾矿库的大坝进行三维静力稳定性分析,研究其在静力作用下的位移、应力变化规律,从而判定其稳定性。三维分析时大坝在正常工况和洪水工况下,在洪水工况下的安全系数均大于规范所规定的最小安全系数要求,即满足规范要求,坝体稳定。     

节理岩体稳定性分析的电算程序

本文介绍了适用于边坡、洞等岩体工程稳定性分析的电算程序。该程序可适用于任何使用FORTRAN语言的计算机,是一个具有一定实用价值的程序。     

基于ArcGIS的边坡稳定性评价系统研究

作者分析总结了当前基于GIS平台的边坡稳定性评价系统的研发现状。采用边坡稳定性评价分析模型与GIS相结合的方法,求解边坡的稳定系数。基于此方法,选用ArcGIS为二次开发平台,以Oracle为后台数据库,开发试验系统。拟使用成熟的二维和三维边坡稳定性分析模型构建系统专业模块。初步开发的系统可以存储海量的边坡数据,可进行边坡三维分析。系统已经耦合了二维边坡分析模型,可进行构造简单边坡的稳定性评价。系统若要得到广泛的实际应用,还需要耦合三维边坡稳定性分析模型和更多的二维复杂边坡稳定性计算模型。     

基于OpenGL的岩石楔形体边坡三维分析系统

随着工程应用的需要和计算机技术的发展,对岩石地质信息三维空间模型的可视化研究逐渐引起了研究人员的关注.用三维可视化技术来表现公路建设中的岩石楔形体边坡的结构和组成,可以更形象直观地研究它的动力稳定性,为公路工程处治提供科学的决策依据.讨论了岩石楔形体边坡三维分析系统的基本功能及系统结构,并分析了该系统的一些关键技术,包括三维模型多视图技术的实现、三维建模、三维交互技术等.最后给出了应用实例,结果表明,该系统具有良好的应用价值.     

霍乱动力学模型中的基本再生数的计算和稳定性分析

本文旨在通过2008年2009年津巴布韦爆发的严重霍乱疫情建立的数学模型来计算基本再生数以及进行稳定性分析.我们首先建立ODE模型并推出两个重要参数βH和βL的值,再进行数值模拟使得其预测结果完全吻合津巴布韦的实际疫情,其后通过此ODE模型的再生矩阵计算基本再生数并进行稳定性分析,并且通过计算出的基本再生数值得到一些预防和控制霍乱的有效方法.     

基于混合模糊控制系统的稳定性分析

本文针对混合模糊控制系统,详细地描述了其 稳定性分析的描述函数法,并给出了应用实例．最后分析了尺度变换比例因子对系统稳定性 的影响．结果表明,该分析方法简单明了,在工程实践中有一定的应用价值．     

《遥感手册》(第十一分册)出版

《遥感手册》(第十一分册)即将由国防工业出版社出版。该分册是原书的第23章和第24章。第23章主要叙述遥感技术应用于城镇环境清查与分析研究,包括遥感应用于城镇形态、职能、演变的作用,城市规划和城镇变化的探测,利用遥感数据建立城镇信息系统,还列举了若干城镇分析实例。第24章叙述遥感技术应用于工程勘测,包括区域清查——工程建设材料清查、地形分析与工程土壤制图、边坡稳定性分析和河网分析;线路测量——公路、     

基于强度折减安全系数的边坡岩土侧压力计算方法探讨

本文对边坡岩土侧压力计算方法进行了讨论,指出了现行计算方法中存在的问题,然后提出基于强度折减安全系数的岩土侧压力计算新方法,供大家参考与借鉴.     

Premium-penalty ant colony optimization and its application in slope stability analysis

Ant colony optimization (ACO) is a very suitable path search algorithm, whose typical application is traveling salesman problem. However, as one heuristic algorithm, it has many shortcomings, such as slow convergent speed and low searching efficiency. To overcome these shortcomings, the premium-penalty strategy has been introduced, and the pheromone diversity of the good paths and the ordinary ones is increased to polarize pheromone density of all paths. Thus, premium-penalty ant colony optimization (PPACO) is proposed. And its good performance is verified by the applications to some typical traveling salesman problems. Its two important parameters are discussed too. Because location critical slip surface in slope stability analysis is a path search problem, it can be solved by the ACO very suitably. Therefore, based on PPACO and typical mature limit equilibrium analysis (Spencer method), a new method to analyze the slope stability is proposed. Through two typical examples, one simple slope and one complicated slope, the efficiency and effectiveness of the new algorithm are verified. The results show that, the new algorithm can always find the less safety factor and its critical slip surface in shorter time than many previous algorithms, and the new algorithm can be used in real engineering very well.     

A modified gravitational search algorithm for slope stability analysis

This paper first proposes an effective modification for the gravitational search algorithm. The new strategy used an adaptive maximum velocity constraint, which aims to control the global exploration ability of the original algorithm, increase its convergence rate and thereby to obtain an acceptable solution with a lower number of iterations. We testify the performance of the modified gravitational search algorithm (MGSA) on a suite of five well-known benchmark functions and provide comparisons with standard gravitational search algorithm (SGSA). The simulated results illustrate that the modified GSA has the potential to converge faster, while improving the quality of solution. Thereafter, the proposed MGSA is employed to search for the minimum factor of safety and minimum reliability index in both deterministic and probabilistic slope stability analysis. The factor of safety is formulated using a concise approach of the Morgenstern and Price method and the advanced first-order second-moment (AFOSM) method is adopted as the reliability assessment model. The numerical experiments demonstrate that the modified algorithm significantly outperforms the original algorithm and some other methods in the literature.     

Novel strength reduction numerical method to analyse the stability of a fractured rock slope from mesoscale failure

The strength reduction method is a suitable numerical method for analysing the stability of complex rock slopes. However, in the determination of the safety factor of a slope, a critical limitation to this approach is the definition of the critical (or limit equilibrium) state of the slope. To overcome this problem, the analysis of the development of the crack tip plastic zone for preexisting cracks in a fractured rock slope is used as the basis for a proposed new method that defines the critical state of the slope by considering mesoscale failure. Thus, using the eXtended Finite Element Method as a tool and based on this new definition, a new strength reduction numerical method to analyse the stability of a fractured rock slope is proposed. Finally, the new method is verified by performing a comparison with the traditional strength reduction method for the numerical study of a rock slope that has four unequal preexisting cracks. The results show that a value of 0.3 for the ratio of the crack space to the short crack length can be considered the new definition of the critical state for a slope. Furthermore, because mesoscale failure appears before macroscale failure, the safety factor corresponding to the new method is smaller than that derived by the traditional method, which considers macroscale failure. Therefore, the proposed method is beneficial for engineering safety.

     

3D simulator for stability analysis of finite slope causing plane activity

This paper describes the development of a 3D simulator that enables a user to analyze the stability of a finite slope causing plane activity among a range of slopes comprised of a finite slope and infinite slope. Until now, there has been considerable theory and research into slope stability. Nevertheless, few systems can be confirmed directly by simulating the stability analysis of a slope, such as landslides. In other words, virtual experiments, such as the analysis of the slope, cannot be performed due to the absence of a system. For that reason, in this study, a 3D simulator was developed for stability analysis of a finite slope causing plane activity from the landslide phenomena that actually occurred or had very high probability. The Nvidia PhysX, which is utilized to develop computer games and simulators, was used to develop a 3D simulator with physical features. In addition, OpenGL was used to provide a three-dimensional visual effect from the simulator. In this paper, the values of each variable were determined to confirm whether landslides can occur easily when the factor of safety (F _s ) was within a certain range in the 3D simulator. The 3D simulator developed in this paper was found to be quite useful because it can verify visually whether landslides occur easily in different environments and conditions.     

基于MapReduce模型的侵蚀地形因子计算方法研究

针对传统侵蚀地形因子提取方法在处理海量数据时出现的瓶颈,提出一种基于MapReduce模型的侵蚀地形因子计算方法。该方法将并行计算模型MapReduce与改进的通用土壤流失方程（revised universal soil loss equation,RUSLE）相结合。利用最大坡降原理和B+树建立流向关系查找树来表现地形数据的相关性;利用MapReduce模型进行流路查找与栅格汇聚来替代传统正反向遍历算法,解决侵蚀地形因子计算过程中汇水和累计坡长的计算效率问题。实验结果表明,对于基于海量数字高程模型数据的地形因子提取,该方法能够在计算精度允许的范围内有效提高效率。     

某山地变电站二级边坡稳定性分析研究

瑞典条分法是对山地变电站边坡进行稳定性分析的一种有效手段,结合光纤传感技术实际监测可以进一步验证边坡的稳定性。利用瑞典条分法进行边坡稳定性验算,分析其安全系数。并布设表面式裂缝传感器监测边坡表面应变量,监测结果显示上表面IS3传感器的应变变化为近540με,下表面IS4传感器的应变变化为近120με,IS5传感器的应变变化为近120με。布设表面分布式紧套光纤,采用OTDR法监测边坡表面形变,监测结果显示光纤链路的衰减系数为12.567 dB/km,衰减曲线有良好线性,无明显台阶,判定边坡处于稳定状态。     

基于FLAC3D的露天矿边坡破坏成因研究与预测

针对某矿区发生多起大规模滑坡、崩塌等地质灾害,对露天矿的安全和正在进行的残矿回采工作造成威胁的问题,以矿区内某矿山为研究对象,利用FLAC3D软件建立露天矿坑边坡数值分析模型,采用传统地质分析方法结合数值模拟对边坡破坏成因进行分析.结果 显示,凝灰岩中发育的顺坡向节理是边坡发生滑塌的关键因素.强度折减法计算结果可知,边坡内部沿节理面形成贯通滑带,是最危险的潜在破坏面;随着时间的推移,深层节理面强度弱化,边坡可能再次发生滑塌.     

数值模拟在边坡稳定性评价中的应用研究

边坡稳定性评价是一个难题,关键难点在于没有准确的稳定性评价方法,传统的条分法、极限分析法、滑移线法等都存在很大的局限性,计算准确性与真实值也都存在一定的误差,而且都没有考虑应力应变所带来的影响.数值模拟的出现改善了这一现状,它融入了本构关系能够消除应力应变所带来的影响,最难得的是通过计算出的滑移面能够为监测设备的合理布放提供准确依据,这也是滑坡预警的前提,实际意义重大,而且它本身可以模拟边坡加载、卸载的全过程,可通过严格的应力、应变分析求解边坡的极限荷载.通过具体工程实践表明数值模拟在边坡稳定性评价中计算准确应用合理,能够直观地得到滑体的滑移破坏面以及应变和应力图等.