近距离煤层巷道锚杆锚索联合支护参数数值模拟研究

基于甘庄煤矿近距离煤层巷道锚杆描索联合支护参数设计,从近距离煤层巷道闱岩实际及本矿巷道乏护现状出发,采用MIDAS/GTS数值模拟,分析了近距离煤层巷道围岩位移、应力分布及破坏范围;研究了不同因素对巷道旧岩变形与破坏的影响,设计得出合理的是护参数,进而提高锚杆锚索联合支护参数设计的科学合理性及实用可靠性,进一步发挥锚杆支护技术的潜力,为近距离煤层巷道支护提供理论依据及技术支持     

煤层巷道围岩预应力锚杆支护技术研究

本文介绍了锚杆支护技术在煤层巷道的应用和影响,同时指出了某些煤层顶板事故发生的原因有多种,锚杆强度较弱只是其中之一,锚杆密度不能从根本上解决问题,而锚杆的预拉力在其中有不可忽视的作用,进而比较系统、详细地介绍了煤层巷道围岩预应力结构理论和支护设计方法。     

近距离煤层群锚网巷道矿压规律分析

范各庄矿业分公司是一个设计年产400万吨的大型现代化矿井,为煤层群联合开采.采掘关系紧张,煤层之间压茬关系不正常,巷道受到采动影响比较严重,巷道维修量大.为摸索围岩变形规律,通过对范矿近距离煤层群巷道进行跟踪监测,搜集整理巷道围岩变形的有关数据,并结合地质情况进行综合分析,总结相关的矿压显现规律,为工程设计和锚杆支护设计提供了依据和经验.     

三软回采巷道锚杆支护技术研究

随着开采深度的增加,三软煤巷是围岩剧烈变形的难维护的回采巷道。通过锚杆对软岩巷道围岩的支护分析,提出加固帮角拉制围岩稳定、高阻让压支护限制围岩变形和强化顶板保证安全的主动支护的思想,研究了合理的锚杆支护技术。     

地下倾斜巷道锚杆支护技术研究

在众多煤矿的深埋巷道支护中,锚杆破断甚至支护体系失效等问题日渐突出.以淮北临涣矿为工程背景,综合考虑影响深部巷道围岩变形的各种因素,建立了临涣煤矿的深部巷道计算模型.采用大型有限元软件ANSYS,分析软岩影响下的巷道变形特点.分析了锚杆支护下的巷道围岩变形的控制,并结合巷道应力破坏特点,对临涣煤矿锚杆支护进行了支护优化设计.对各种锚杆支护工况进行了数值模拟仿真分析,得出锚杆支护效果不仅与围岩条件及巷道自身特点有关,而且与锚杆自身设计参数有关的结论.     

锚杆支护在软岩巷道施工中的应用

介绍了我公司现施工巷道的地质情况,根据锚杆作用的机理,选择合理的支护参数,采用光面爆破和锚杆支护技术在软岩中施工,控制了围岩的变形和破坏,提高了围岩的强度,取得了良好的经济效益。     

基于原岩应力测量的软岩巷道支护优化设计研究

为了解决曹庄煤矿高应力软岩巷道支护困难的问题,进行了井下原岩应力实测,采用基于实测地应力的锚杆支护优化设计方法,优化了巷道支护设计参数。工程实践表明,该支护技术有效控制了高应力软岩巷道围岩变形,取得了良好的技术经济效益,提供了一种控制高应力软岩巷道围岩变形的有效方法,对类似条件下巷道支护设计具有一定借鉴意义。     

深井煤巷围岩控制技术的研究

采深近千米的矿井地应力大,尤其回采巷道受多种作用力的影响,巷道变形严重.通过采用高强度锚杆锚网梁组合支护技术,在高强度锚杆支护系统的基础上,进一步在项板和两帮增加锚索加强支护,有效地改善了巷道使用状况,强化了围岩的相对稳定.     

软岩开拓巷道过煤层断层时联合支护的应用

为了解决杨柳煤矿软岩开拓巷道过煤层和断层地段支护难的问题,提出了锚、架、注联合支护方案,实践证明这种支护方式很好的控制了巷道围岩的变形,保证了巷道的稳定性,满足了矿井的生产要求,且经济效益显著,具有推广应用价值。     

唐山矿五层煤锚杆支护技术分析

本文介绍了开滦集团公司唐山矿中等稳定顶板条件下煤巷锚杆技术使用情况，分析了大断面巷道中应用锚索补强加固的作用机理，提出了不同支护条件下巷道的变形规律，评价了该技术应用的技术经济效益。     

深井软岩强变形巷道新型支护设计

通过对深井高地压软岩强变形巷道复合性支护的可行性研究,确定合理、有效的支护形式,对煤矿安全生产,经济效益都有着十分重要重要的意义,这项支护新工艺有望在全国煤矿企业具有相似地质地压条件下推广使用。     

查庄煤矿31213工作面全煤巷道松动圈测试研究

应用非金属超声检测技术对孤岛工作面沿空开采巷道进行松动圈厚度测试,采集了详实的数据,总结出了松动圈厚度的变化规律,为优化支护参数提供了依据.     

Analysis of dynamical response to large deformation of piles with initial displacements

In this paper, a nonlinear mathematical model for analyzing dynamical response to the large deformation of piles with initial displacements is firstly established with the arc-coordinate, and it is a set of nonlinear integral-differential equations, in which, the Winkeler model is used to simulate the resistance of the soil to the pile. Secondly, a set of new auxiliary functions are introduced. The differential-integral equations are transformed into a set of nonlinear differential equations,and the differential quadrature method (DQM) and the finite difference method (FDM) are applied to discretize the set of nonlinear equations in the spatial and time domains, respectively. Then, the Newton-Raphson method is used to solve the set of discretization algebraic equations at each time step. Finally, numerical examples are presented, and the dynamical responses to the deformation of piles, including configuration, bending moment and shear force, are graphically illuminated. In calculation, two types of initial displacements and dynamical loads are applied, and the effects of parameters on the dynamical responses of piles are analyzed in detail.     

Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory

Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows： the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the ttiird was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d.     

法兰联接用平面金属垫片的力学性能分析

金属垫片被广泛地用于高温、高压、强腐蚀介质的法兰联接中,是压力容器和管道中常见的密封形式.本文建立了螺栓-法兰-垫片联接系统模型,分析了预紧状态和工作状态平面金属垫片的应力应变.结果显示,垫片高应力区域出现在外圆周部分,圆周外沿首先发生塑性变形;介质压力作用加剧了垫片塑形变形,对垫片轴向变形量影响较大.     

Quasi-static and dynamical bending of a cantilever poroelastic beam

Based on the theory of porous media, the quasi-static and dynamical bending of a cantilever poroelastic beam subjected to a step load at its free end is investigated, and the influences of its permeability on bending deformation is examined.The initial boundary value problems for dynamical and quasi-static responses are solved with the Laplace transform technique,and the deflections, the bending moments of the solid skeleton and the equivalent couples of the pore fluid pressure are shown in figures. It is shown that the dynamical and quasi-static behavior of the saturated poroelastic beam depends closely on the permeability conditions at the beam ends. Under the different permeability conditions, the deflections of the beam may oscillate or not. The Mandel-Cryer effect also exists in liquid-saturated poroelastic beams.     

SPH modeling of droplet impact on solid boundary

A droplet undergoes spreading,rebounding or splashing when it impacts solid boundary,which is a typical phenomenon of free surface flow that exists widely in modern industry.Smoothed particle hydrodynamics（SPH）method is applied to numerically study the dynamical behaviors of the droplet impacting solid boundary,and both the spreading and rebounding phenomena of the droplet are reproduced in the simulation.The droplet deformation,flow fields and pressure fields inside the droplet at different moments are analyzed.Two important factors,the initial velocity and diameter,are discussed in determining the maximum spreading factor,revealing that the maximum spreading factor increases with the increase of the impact velocity and droplet diameter respectively.     

浅析2906综放工作面的突出危险性

2906工作面采前进行本煤层密集钻孔预抽，基本上消除了工作面的突出危险性；在生产过程中，采用边采边抽和浅孔中压注水措施，完全消除了工作面的突出危险性。这说明：只要采前抽放好，生产期间措施得力，突出煤层采用综放工艺是完全可行的。