路堑高边坡加固技术研究

随着我国高速公路的大规模建设,高边坡发生变形破坏的事故频繁发生,高边坡的加固对工程起到至关重要的作用,针对抗滑桩、锚（索）杆、格构加固、喷锚网支护和注浆加固等加固方案进行了讨论,指出在工程中应根据条件综合选用,以确保公路边坡的稳定、安全、环保。     

基于强度折减法的填方边坡稳定性分析

通过对宁芜改线深基坑工程放坡开挖段填方高边坡采用有限元强度折减法进行数值模拟分析,讨论了在监测中高边坡坡顶发生大的裂缝的原因,根据有限元模型的受力和变形机理进行了分析,以此为根据提出填方高边坡的加固方案.     

基于群体AHP的采掘计划灰色关联分析评价

通过对矿井采掘过程的调研与分析,设计了衡量采掘计划的１２项评价指标,利用群体ＡＨＰ法确定出各指标的权重,然后采用灰色关联度分析对其进行评价和排序,较好地从多个采掘计划方案中选择出比较合理的方案．从而保证矿井采掘的正常接替,使矿井生产系统的设备能力得以充分发挥．该方法为采掘计划多方案优选提供了一种思路和方法     

基于Hoek-Brown准则确定岩体参数的边坡稳定性分析

以某岩质高边坡为研究对象,通过野外调查分析,根据边坡岩体结构和破坏特征,应用Hoek-Brown经验准则确定岩体抗剪强度参数,采用极限平衡法和FLAC-2D有限差分程序对边坡进行稳定性分析,并依据分析结果制定了加固方案,通过分析验证和现场监测,结果表明边坡加固方案可行.     

Slope Stability Analysis Based on Rock Mass Parameters Determined by Hoek-Brown Criterion

以某岩质高边坡为研究对象,通过野外调查分析,根据边坡岩体结构和破坏特征,应用Hoek-Brown经验准则确定岩体抗剪强度参数,采用极限平衡法和FLAC - 2D有限差分程序对边坡进行稳定性分析,并依据分析结果制定了加固方案,通过分析验证和现场监测,结果表明边坡加固方案可行.     

路堑高边坡锚固工程预应力锚索基本试验

由于地质因素的不确定性，高边坡工程复杂性和锚固工程的特殊性，待边坡开挖揭示后，根据边坡的实际地层岩性，风化程度、破碎程度、构造裂面、坡体结构和含水状态等因素，综合校核和分析判断是否实际，对高边坡防护加固进行动态设计，确保坡体稳定结构安全．我们对某高速公路不同地质高边坡进行基本试验，确定压力分散型锚索的极限承载力，验证锚索设计参数与施工工艺的合理性．     

前坪水库溢洪道高边坡设计方案优化研究

前坪水库溢洪道高边坡的初步设计方案中,开挖边坡坡度为1∶0.5,采用5 m长锚杆Φ25 mm@2×2 m加固支护。通过系统优化研究,调整开挖边坡坡度为1∶0.4,采用10 m长锚杆Φ25 mm@3×3 m加固支护。采用GEO-SLOPE软件对不同工况下前坪水库溢洪道高边坡的稳定性进行了极限平衡分析,并采用FLAC 3D软件计算了不同工况下边坡的应力和变形分布规律。计算结果表明:优化设计方案中溢洪道高边坡开挖后在无水、正常水位及相应地震工况下的安全系数均大于1.3,满足规范要求。按优化设计方案开挖后,边坡在无水、遭遇洪水及地震3种工况下,开挖面上的最大主应力均出现拉应力,3种工况下的最大拉应力为0.24 MPa,小于安山玢岩的抗拉强度。优化设计方案与初步设计阶段的方案相比,可减少土石方开挖量约5万m3,具有显著的经济效益。     

某露天矿陡帮边坡稳定性分析与加固设计

根据某露天矿陡帮边坡的工程实际,采用极限平衡方法等进行了露天矿陡帮边坡的稳定性分析,提出了合理而有效的加固方案,并进行了加固后的边坡稳定性分析和评价.结果表明：该露天矿陡帮边坡长期暴露在自然条件下稳定性会逐渐降低,如遇饱水或渗流,边坡可能会发生失稳.采用预应力锚索框架梁加固后,边坡的稳定系数显著提高,边坡处于稳定状态,从而保证了矿区的安全生产.     

高边坡加固治理方法及应用

边坡稳定分析一直是岩土工程中的重要研究内容,其中高边坡的稳定性问题在水利水电工程建设中越来越引起人们的重视。本文分析了影响高边坡稳定的因素,就水利水电工程岩质高边坡的加固治理措施作简要介绍。     

某溢流坝闸墩除险加固方案分析

本文针对某溢流坝闸墩开裂情况,用有限元法进行了应力分析,比较了几种加固方案,分析了预应力锚索对闸墩应力的影响,选择合理的加固方案．     

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.     

Stability and reliability of pit slopes in surface mining combined with underground mining in Tonglushan mine

Slope stability is of critical importance in the process of surface-underground mining combination. The influence of underground mining on pit slope stability was mainly discussed, and the self-stabilization of underground stopes was also studied. The random finite element method was used to analyze the probability of the rock mass stability degree of both pit slopes and underground stopes. Meanwhile, 3D elasto-plastic finite element method was used to research into the stress, strain and rock mass failure resulting from mining. The results of numerical simulation indicate that the mining of the underground test stope has certain influence on the stability of the pit slope, but the influence is not great. The safety factor of pit slope is decreased by 0.06, and the failure probability of the pit slope is increased by 1.84%. In addition, the strata yielding zone exists around the underground test stope. The results basically conform to the information coming from the field monitoring.     

Application of open-pit and underground mining technology for residual coal of end slopes

Given the conditions of residual coal from the boundary of a flat dipping open-pit mine,which uses strip areas mining and inner dumping with slope-covering,we propose an open-pit and underground integrated mining technology for residual coal of end slopes.In the proposal a conveyance road and ventilation conveyance near the slope are built,corresponding to the pit mining area and the surface coal mine dump,as well as an interval haulage tunnel and air-inlet tunnel.The outcome shows that such mining method may reduce the effect to slope stability from underground mining,it does not affect the dumping advance and has a high recovery rate of residual coal resources.The working face is timbered by single hydraulic props,transported by a scraper conveyor and supported by coal walls.This method of mining is one of layered top coal caving,with high resource recovery,low production cost where positive economic benefit can be realized.     

井工开采对边坡稳定性影响的有限元分析

边坡下方井工开采是一个露天煤矿普遍存在的问题。本文采用有限元方法针对某一具体实例进行了数值模拟。模拟考虑了岩体力学特性及岩体结构特征,并模拟了井采过程。通过井采前后边坡岩体应力分析、位移分析,对边坡下方井工开采对边坡稳定性影响获得了一些认识。     

古遗址边坡在卸荷条件下的稳定性研究

以铜绿山边坡为工程背景,分析了边坡的稳定性。采矿过程产生的卸荷力学条件与常规的加载力学试验参数、模型和方法完全不同。本文通过对卸荷岩体力学原理研究表明,对于采矿一类的岩体工程问题应该应用岩体卸荷的应力、应变路径来分析。本文从铜绿山遗址边坡的地质特征人手。在了解边坡地质特征的基础上,参照边坡的变形破坏现状,采用非线性弹塑性力学模型,运用ANSYS软件对古遗址边坡的采矿过程进行了分析。并且与不考虑采矿过程做了对比研究。     

露天矿边坡稳定性影响因素的灰关联分析

根据灰关联分析的原理,建立了以边坡稳定性影响因素为子序列、以其稳定性系数为母序列、以关联度为评价结果的灰色关联模型,用以评判各因素对边坡稳定性的影响程度.并利用该模型,通过实例计算,得到了影响露天矿边坡稳定性各因素的主次关系.计算结果表明,边坡岩体的容重以及地下水是影响边坡岩体稳定性最主要的因素.     

岩质高边坡岩体力学参数确定及稳定性研究

以云南某露天矿采场岩质高边坡工程为研究对象,阐述了岩体力学参数在边坡稳定性分析中的重要性,因原位试验对于坚硬岩体或极软岩体的不适用性,对坚硬岩体,以室内试验得出的岩石物理力学参数和岩体质量评价RMR评分值为依据,并综合考虑岩体中节理裂隙、岩体结构、地下水的影响,运用霍克-布朗(Hoek-Brown)强度准则将岩石力学参数进行折减修正后换算成岩体力学参数,并与现场原位试验所得软弱岩体力学参数结果相结合得到最终岩体力学参数.在上述调查、研究基础上,采用有限差分法(FLAC数值分析软件)对现状边坡进行静态的稳定性分析,提出合理的最终边坡角及总台阶高度,保证矿山正常生产和经济效益的提高.     

大空间建筑环形点式重载作用下深废矿坑岩壁变形稳定性数值分析

近年来,大城市工程建设急速发展,土地资源愈发紧张,一些矿产资源型城市中出现了利用废弃天然矿坑进行地下空间开发的改造项目。以长沙湘江欢乐城项目深废矿坑改造开发工程为背景,针对矿坑边坡稳定性以及受建筑结构点式荷载作用下的岩壁与基础协同作用问题,利用数值分析手段建立三维岩壁-建筑结构相互作用模型。研究岩壁在环形点式受荷条件下的表现,并探究遭遇突发性岩壁变形及承载状态变化后,岩壁与结构的稳定性变化情况。结果表明,在天然状况下废弃矿坑的开采高边坡基本处于稳定状态;而施工扰动和建筑荷载造成的应力变形仅发生于岩壁表面,未达岩体深部;岩壁由于突发灾害产生的局部大变形会严重危及支承其上的基础和结构安全;而在合理的建筑物环形点式基础设计布置情况下,基础结构的偶然失效不会影响岩壁和建筑物的稳定性。     

安家岭露天煤矿端帮采煤方法研究

将井工开采的放顶煤采煤技术应用于平朔安家岭露天煤矿端帮煤开采,提出了“煤墙支撑简易放顶煤”采煤法。该法将煤层全厚分为上下两个采掘层,每个采掘层又分为上下两个分层,采掘下分层时用单体液压支架支护,采掘上分层时采用顶板放炮民落煤,采掘的煤层厚度可达10m以上,此种采煤方法具有安全可靠,资源回收率高、作业效率高等优点。     

Stability assessment and feature analysis of slope in Nanfen Open Pit Iron Mine

Under the combined influences of special topography and the long term mining in Nanfen Open Pit Iron Mine, many large scale landslide masses appeared in heading side of stope, and tens of millions of iron mine is buried underside, making great economic losses. In order to guide the safety mining and increase the supply quantity, this paper through the use of MSARMA-method and the “MSARMA evaluation and analytical system for slope stability analysis” based on this method, which aimed at the quantitative evaluating of the slope stability before and after the actual mining below the slip mass, and the sensitivity analysis for the main influencing factor, providing scientific proof for the parameter optimization of open mine surface slope, the security and sustainable exploitation.