Stability analysis of the sliding process of the west slope in Buzhaoba Open-Pit Mine

To study the stability of the west slope in Buzhaoba Open-Pit Mine and determine the aging stability coefficient during slide mass development, the deformation band of the west slope and the slide mass structure of the 34,600 profile are obtained on the basis of hydrology, geology, and monitoring data.The residual thrust method is utilized to calculate the stability coefficients, which are 1.225 and 1.00 under sound and transfixion conditions, respectively. According to the rock damage and fragmentation and the principle of mechanical parameter degradation, the mechanical models of the slide mass development of the hard and soft rock slopes are established. An integrated model for calculating the slope stability coefficient is built considering water, vibration, and other external factors that pertain to the structural plane damage mechanism and the generating mechanism of the sliding mass. The change curve of the stability coefficient in the slide mass development is obtained from the relevant analyses,and afterwards, the stability control measures are proposed. The analysis results indicate that in the cracking stage of the hard rock, the slope stability coefficient decreases linearly with the increase in the length Lbof the hard rock crack zone. The linear slope is positively correlated to rock cohesion c. In the transfixion stage of the soft rock, the decrease speed of the stability coefficient is positively correlated to the residual strength of the soft rock. When the slope is stable, the stability coefficient is in a quadratic-linear relationship with the decreased height Dh of the side slope and in a linear relationship with anchoring force P.     

Influence of depth-thickness ratio of mining on the stability of a bedding slope with its sliding surface in concave deformation

In order to study the influence of depth-thickness ratio on bedding slope stability, whose sliding surface is flexural concave in shape under mining conditions, this paper aims to study the characteristics of deformation and damage of bedding sliding with depth-thickness ratios of 200:1, 150:1, 120:1, 100:1 and 50:1by adopting numerical simulation analysis software combined with laboratory-made ‘‘under the influence of mining variable sliding surface slope similar simulation test bed", and to propose identification methods for slope stability under the influence of mining. The results show that mining activities under the slope reduce slope stability. With a decrease in the mining depth ratio, the influence of mining on the slope increases gradually, and the damage to the slope gradually expands, the stability of the slope gradually reduces, fracture occurs on the slope toe and the central fissure gradually develops to the surface,and reaches slide threshold when the depth-thickness ratio is 50:1.     

某县绕城路高陡边坡稳定性分析与处治措施?

高边坡稳定性分析与治理是一项复杂的工程问题,工程性质及边坡岩体结构是影响高陡边坡稳定的关键因素。针对某县绕城路开挖后形成的高陡边坡,用定性与定量结合的方法对该边坡进行分析,最终提出了较合理的边坡支护与处治措施,为以后同类型的工程提供借鉴实例。     

河南工业绿色发展效率演化及其影响因素研究

推动工业绿色发展,是中原经济区建设的核心任务之一。基于标杆管理思想,运用DEA模型对2001-2012年河南省工业绿色发展效率演化趋势进行研究,并通过灰色斜率关联度模型分析了工业绿色发展效率的影响因素。结果表明:河南省工业绿色发展效率呈现缓慢上升的演化趋势,工业外延式发展特征明显;究其原因,工业结构重型化和环境规制不足制约了工业绿色发展效率的提高,城市化、工业化、产业转移、经济发展水平这4个因素对河南省工业绿色发展效率有较大的正向促进作用,创新驱动因素对河南省工业绿色发展效率的提高仅有微弱的促进作用。最后,根据研究结果提出了促进河南省工业绿色发展的政策建议。     

土体抗剪强度指标变异水平对边坡稳定安全系数取值的影响

针对传统的边坡稳定极限平衡方法不能考虑土体抗剪强度指标变异性影响的问题,基于极限状态的概率分析原理,采用Monte-Carlo法对均质路堤边坡的稳定性开展了可靠度计算,讨论了稳定安全系数一定的条件下边坡失效概率随土体抗剪强度指标变异水平的变化规律,分析了安全系数与边坡可靠指标的对应关系及其随土体抗剪强度指标变异水平的变化特征。研究表明：边坡可靠度受土体抗剪强度指标变异性影响显著,呈现出随土体抗剪强度指标变异水平提高而急剧减小的趋势;为保证边坡具有相同的可靠性,安全系数的取值应与土体抗剪强度指标的变异性相适应,据此提出了基于可靠指标和土体抗剪强度指标变异水平的安全系数取值原则及其对应的三参数函数关系式。     

边坡工程中抗滑群桩工程特性的数值分析

针对建立抗滑群桩的设计方法问题,分析了抗滑群桩在水平推力作用下的力学行为.以重庆江东边坡的典型断面为例,应用有限元程序CORE3D分析了群桩的桩间颗粒土的土拱区域,结合桩的荷载位移曲线、土拱效应解释了土体应力传递到抗滑桩的规律,通过对影响土拱效应的参数,如桩间距、土体厚度、抗滑桩嵌入深度和桩径等的深入研究,提出了相应的群桩布置参数估算公式.研究成果在重庆江东边坡的防护工程设计中得到了应用,并取得了较好的效果.     

Stability analysis for natural slope by kinematical approach

The stability of natural slope was analyzed on the basis of limit analysis. The sliding model of a kind of natural slope was presented. A new kinematically admissible velocity field for the new sliding model was constructed. The stability factor formulation by the upper bound theorem leads to a classical nonlinear programming problem, when the external work rate and internal energy dissipation were solved, and the constraint condition of the programming problem was given. The upper bound optimization problem can be solved efficiently by applying a nonlinear SQP algorithm, and stability factor was obtained, which agrees well with previous achievements.     

基于微缺陷累计成核数序列的岩石边坡滑移带尺度增长预测

岩石边坡滑移带是一个微损伤聚集带,每一个微损伤实际为一个微缺陷成核,因此,存在累计微缺陷成核数与滑移带尺度增长的对应关系.这个关系以裂纹系统的最大尺度cmax作为未知量,需要确定的参数有材料颗粒尺度δ,微裂纹尺-频分布分维数Dc,裂纹表面粗糙度分维数Ds,微裂纹总数Nd以及微缺陷成核累计数Nd.通过对边坡数值模拟微裂纹系统的统计分析,发现该尺度增长模型的预测值与实测值吻合较好.微缺陷成核数序列与声发射序列有较多的相似性,因此,研究结果为预测边坡内部裂纹增长提供了参考.     

含软弱夹层的某公路边坡开挖支护数值模拟分析

基于某含有软弱夹层的公路边坡工程,利用有限元软件对其开挖支护过程进行数值模拟分析,计算考虑了2种不同的开挖工况：1）只开挖不支护;2）开挖并及时支护。研究表明：在开挖未支护时,边坡开挖完成后安全系数小于1,边坡整体都发生很大位移,将沿着软弱夹层带发生破坏;在开挖并及时支护时,边坡位移明显减小,软弱夹层附近塑形变形区得到了有效控制,且开挖完成后安全系数为1．87,满足设计要求。     

上部土钉墙-下部桩锚支护结构整体计算模型研究

以郑州市郑东新区上部土钉墙-下部桩锚支护结构为背景,采用放坡简化模型和超载简化模型,分别采用理正软件进行变形计算,将相应成果与实测数据和有限元数值分析成果比较,发现放坡模型对应的结构变形比超载模型大。采用超载模型计算简便,且可以保证工程安全。