非饱和红砂岩风化土土水特征及降雨对其边坡稳定性的影响

为防止非饱和红砂岩风化土边坡因水分状态的变化出现失稳破坏,对其开展土水特征及降雨作用下稳定性变化研究。首先,针对不同初始干密度、初始质量含水率条件下的非饱和红砂岩风化土进行脱湿试验,得到其土水特征曲线,通过分析其规律,提出改进指数函数模型,并与F-X模型进行对比。应用该模型进行数值模拟,分析降雨强度及时长对边坡稳定性的影响。结果表明：在参数更少、表达形式更简洁的条件下,改进的指数函数模型达到了与F-X模型相近的拟合精度,并且对残余含水率的估算结果更准确,对红砂岩风化土具有更好的适用性;在降雨持时相同时,降雨强度增大,坡体饱和度增加,边坡稳定性降低;随着降水持时延长,0～6 h段边坡稳定性显著降低,之后稳定性下降较小;短时间的强降雨对于红砂岩风化土边坡稳定性影响较大。     

降雨和蒸发对粉质黏土边坡稳定性影响分析

以山西某露天矿粉质黏土边坡为工程背景,基于饱和-非饱和渗流理论及流固耦合原理,采用有限单元法研究了降雨和蒸发作用下边坡孔隙水压力、体积含水量、位移及应变变化特点,并对不同降雨强度和蒸发强度下的边坡孔隙水压力和安全系数进行了对比分析。研究结果表明:降雨入渗导致浅层土体含水量增大,基质吸力降低,降低边坡稳定性,降雨强度越大,边坡稳定性下降越快;蒸发会降低浅层土体的含水量,增加吸力,提高边坡稳定性,且蒸发强度越大,安全系数提高越快;边坡孔隙水压力和安全系数与天气条件之间存在滞后关系,滞后时间随土体深度增加而增加。     

地下水对露天矿北部边坡稳定性的影响探讨

通过分析露天矿北部边坡地下水状况,讨论了在爆破震动影响下,地下水对露天矿边坡稳定性的影响。     

影响金堆城露天矿边坡稳定性的因素分析

在金堆城露天矿边坡角设计比较合理，目前较稳定的前提下，主要对边坡体的现状及其影响边坡体稳定性的因素和应力学特点作了相关性的分析。     

金堆城露天矿北部边坡稳定性分析

通过对金堆城露天矿北部边坡的地质结构、地下水和爆破震动等影响边坡稳定性因素的分析，结合对边坡进行力学模拟计算，对边坡的稳定性进行了评价，最后提出了边坡治理与维护的建议。     

露天矿边坡稳定性的两级模糊综合评判

露天矿边坡稳定性是一项极其复杂的系统工程，影响因素很多，而各因素的影响程度不大相同，采用了两级Ｆｕｚｚｙ综合评判的方法，使影响露天矿边坡稳定的诸因素尽可能真实地参与评判，并确定出各区各坡稳定的级别及稳定的程度。     

用倾斜分条法分析露天矿边坡稳定性

本文主要介绍了倾斜分条法的原理、计算公式;并结合工程实例,对边坡稳定性进行了分析计算,得出了一些有益的结果,并与其它计算方法的结果作了比较。     

石宝露天矿采场最终边坡稳定性分析

针对石宝露天矿3个采坑采场最终边坡出现的不稳定现象，根据其工程地质和水文地质条件，并结合现场工程地质勘察和岩石力学试验，运用极限平衡分析法对其整个采场的最终边坡进行了详细的分析和研究。分析结果表明，石宝露天矿采场边坡均处于稳定状态，但是A、B、C、E、F、I、K、L8个分区边坡从稳定性考虑，需要减缓边坡角，D、G、H、J4个分区边坡角可提高，加陡时应考虑现场工程地质状况。     

云南大理某边坡稳定性分析

边坡稳定性问题关系着当地民生,影响社会的经济发展。采用赤平投影法、瑞典条分法、圆弧滑动法对云南大理某边坡在其天然、暴雨、地震状态下的稳定性进行定量、定量分析。研究表明：两个边坡在天然工况下处于稳定—基本稳定的状态,在暴雨工况下处于欠稳定的状态,在地震工况下处于欠稳定—不稳定的状态,故需采用工程措施进行支护,加强其稳定性。     

穆利亚希南露天边坡稳定性分析

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。     

Numerical Analysis of Rainfall Effects on Slope Stability

The finite element analysis of transient water flow through unsaturated–saturated soils was used to investigate effects of hydraulic characteristics, initial relative degree of saturation, methods to consider boundary condition, and rainfall intensity and duration on water pressure in slopes. The finite element method with shear strength reduction technique was used to evaluate the stability of slopes under rainfall. The results of the finite element analysis indicated that the hydraulic characteristics, initial relative degree of saturation, methods to consider boundary condition, and rainfall intensity and duration had significant influence on the water pressure in slopes, and thus on the stability of slopes under rainfall. The good comparisons of the numerical results with statistical and observational results showed the ability of the finite element analysis to evaluate the stability of slopes under rainfall.     

银山矿露天边坡稳定性分析

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。     

露天边坡稳定性分析及防治措施探讨

论述了凉山矿业股份有限公司露天矿在陡帮开采工艺条件下,通过认清露天边坡的特点及找准影响边坡稳定性因素的基础上,采用减震爆破技术,是确保露天边坡稳定的重要手段之一。     

基于优势结构面的矿山边坡稳定性分析

针对露天边坡的稳定性问题,首先利用玫瑰花图和极点等密度图对结构面产状进行统计分析,然后结合边坡的地形地貌、地层岩性以及结构面发育程度等多方面因素得出对边坡稳定性起控制作用的优势结构面,并采用赤平极射投影对边坡的稳定性进行定性分析。结果表明,利用优势结构面判断矿山边坡是否稳定具有一定的可行性。     

某露天矿边坡滑塌治理方案

针对某露天矿山边坡滑塌现象,通过了解边坡地质条件及现场情况,提出了一种结合主动柔性防护网和普通砂浆锚杆锚固的边坡滑塌治理方案,采用钢丝绳网、普通钢丝格栅等主要材料,通过钢丝绳锚杆和支撑绳的组合稳定坡面,防止边坡岩体进一步滑移和坍塌。治理后达到矿山安全生产的要求,滑塌区域边坡面安全稳定。     

Effect of Antecedent Rainfall Patterns on Rainfall-Induced Slope Failure

Rainfall-induced slope failure occurs in many parts of the world, especially in the tropics. Many rainfall-induced slope failures have been attributed to antecedent rainfalls. Although it has been identified as a cause of rainfall-induced slope failure, the pattern or distribution of the antecedent rainfall has not received adequate attention. In this study, parametric studies were performed by using three typical rainfall patterns, identified by analysis of available rainfall data for Singapore and two different soil types to represent high- and low-conductivity residual soils of Singapore. Antecedent rainfall patterns were applied on soil slopes and a transient seepage analysis was conducted. The computed pore-water pressures were used in stability analyses to calculate the safety factor of the slope. Results indicated that antecedent rainfall affected the stability of both high-conductivity (HC) and low-conductivity (LC) soil slopes. However, the stability of the LC soil slope was more significantly affected than the HC soil slope. Patterns of antecedent rainfall controlled the rate of decrease in factor of safety, the time corresponding to Fs(min) and the value of Fs(min). Delayed rainfall pattern resulted in the lowest minimum factor of safety, Fs(min), for the HC soil slope, and advanced rainfall pattern resulted in the lowest Fs(min) for the LC soil slope.     

基于FlAC3D的露天矿边坡稳定性及影响因素敏感性分析

结合露天矿边坡实际情况,利用FLAC3D数值模拟软件对露天矿边坡进行三维数值模拟分析,运用有限元强度折减法计算边坡稳定安全系数。为研究各因素对边坡稳定性的影响,选取6个典型边坡影响因素（内摩擦角、黏聚力、抗拉强度、重度、弹性模量和泊松比）设计正交试验,采用FLAC3D数值软件对正交实验方案进行模拟运算,运用多因素灰色关联分析法分析计算结果,并与单因素分析进行对比。结果表明：根据计算不收敛这一判据,求解安全系数流程简单,在满足精度要求的情况下,求得边坡安全系数为1.96;2种分析方法计算得出的各因素敏感性大小基本一致,内摩擦角对边坡稳定性的影响最大,其次是黏聚力,泊松比的影响最小。其中,多因素分析过程中正交实验灰色理论耦合分析考虑各因素之间的交互作用,通过计算各影响因素之间的关联度,得出各影响因素的敏感性大小,所得结果更加可靠。     

Effects of Groundwater Table Position and Soil Properties on Stability of Slope during Rainfall

Rainfall, hydrological condition, and geological formation of slope are important contributing factors to slope failures. Parametric studies were carried out to study the effect of groundwater table position, rainfall intensities, and soil properties in affecting slope stability. Three different groundwater table positions corresponding to the wettest, typical, and driest periods in Singapore and four different rainfall intensities (9, 22, 36, and 80 mm/h) were used in the numerical analyses. Typical soil properties of two main residual soils from the Bukit Timah Granite and the sedimentary Jurong Formation in Singapore were incorporated into the numerical analyses. The changes in factor of safety during rainfall were not affected significantly by the groundwater table near the ground surface due to the relatively small changes in matric suction during rainfall. A delay in response of the minimum factor of safety due to rainfall and a slower recovery rate after rainfall were observed in slopes from the sedimentary Jurong Formation as compared to those slopes from the Bukit Timah Granite. Numerical analyses of an actual residual soil slope from the Bukit Timah Granite at Marsiling Road and a residual soil slope from the sedimentary Jurong Formation at Jalan Kukoh show good agreement with the trends observed in the parametric studies.     

深凹露天矿高陡边坡稳定性分析与设计优化

以首钢水厂铁矿为依托工程,在系统的边坡工程地质勘查、岩体结构、水文地质调查与渗流场分析、矿区地应力场测量和矿岩物理力学特性测试的基础上,采用固-流耦合的有限差分法、离散单元法和极限平衡分析法相结合的方法,进行了水厂铁矿高陡边坡稳定性的系统分析研究和边坡优化设计,使水厂铁矿各分区的总体边坡角提高了1~6°.