郭村井田煤层底板采动破坏规律数值模拟研究

研究本矿井煤层底板岩体采动影响特征是研究煤层底板突水的前提条件,确定开采后底板破坏带或底板裂隙带尤为重要,为回采前采取相应的防治水措施提供依据。本文通过采用FLAC3D数值分析方法来模拟研究郭村井田工作面回采过程中底板应力场、变形破坏特征及其影响因素,更切合实际地对郭村井田二1煤层采动过程中底板破坏进行研究,并发现其破坏规律。     

近距离煤层采空区底板破坏特征及影响分析

针对近距离煤层开采过程过中,上层煤开采过后导致下层煤巷道围岩受扰动破坏,下层煤回采巷道围岩破碎严重、完整性较差的实际情况,利用滑移线场理论再结合部分矿场,进行实际计算不同采高时上层煤采空区底板破坏的范围,并根据两煤间距变化情况对不同状况下下层煤巷道稳定性进行分析,得出了采空区底板最大破坏深度随采高的增加而增大、两煤间距越大对下层煤巷道稳定性影响越小的结论。     

回采巷道变形分析及支护选择

煤矿回采巷道受矿山应力及采动影响;顶底板岩性特性;地质构造应力多方面的共同作用,在回采工作面尚未回采完毕时,巷道变形破坏严重,断面缩小不能满足生产要求,分析回采巷道的变形和破坏特点、原因,选择合理的支护参数和施工工艺,提高工程质量,加强生产管理,探索不同地质条件下支护手段,满足矿井安全生产要求.     

采动影响下穿层钻孔二次封孔技术研究

基于对某煤矿煤层瓦斯赋存情况的总结,分析了其底板瓦斯抽采巷抽采钻孔设计方案及封孔工艺流程,指出采动影响是造成巷道松动圈扩大、钻孔漏气、瓦斯浓度过低的主要原因,根据其瓦斯抽采过程中存在的实际问题,研究设计出一种新型封孔管技术方案,并进行了工业性实验,结果表明,在采动影响下应用新型瓦斯抽采封孔技术,可达到大幅度提高瓦斯浓度、提高瓦斯抽采率的目的。     

云南金沙磷矿地下开采对地表公路安全性的影响分析

为了研究矿山采场开采后围岩稳定性及对上覆公路的影响,采用离散元软件2D-block,模拟5种工况,对模拟结果的应力、位移、速度云图进行了分析;结果表明:采场开采至920m、935m水平时,顶底板应力、位移、速度变化很小,不影响矿区公路安全;当开采至950m水平时,顶底板应力、位移、速度有了明显变化,但对公路仍不构成大的威胁,安全起见,此时应适当减小采场结构参数;开采至近地表时,地表垮塌,影响到公路安全。因此,建议开采范围控制在950m水平以下,并采取监测等手段以切实维护采场及上覆公路的安全。     

鑫珠春矿03072上风道底板加固9#钻孔的探讨研究

断层、裂隙、底板酥软等地质构造造成采煤工作面在回采过程突水或涌水,影响回采,还可能淹面造成更大的事故。目前,采用超前预注浆技术对采煤工作面的底板进行加固,对采面内裂隙、断层的导水通道进行封堵,达到采面安全回采。但在底板加固,裂隙、断层导水通道封堵过程中受力传递的影响,使上下两巷出压力增大,出现底鼓,支架严重变形等,对巷道造成破坏,无法使用。通过分析研究,发现钻孔施工参数及操作工序对其影响非常大,对此,文章总结出了一些关键的施工环节。经过9#孔实验,取得非常好的效果。     

中海油大厦基坑支护设计综述

中海油大厦核心筒区域基坑深度为24.05m,塔楼区域基坑深度为22.55m,平面距离深圳地铁2号线最近段为20.9m,该项目地下室底板与地铁2号线隧道底板基本持平,基坑无放坡条件,该项目基坑支护方式从经济、技术以及场地等情况综合考虑,采用"钻孔咬合桩+环撑"的支护形式。     

新式三岔门支护工艺的研究与应用

针对工作面两巷出口处三岔门支护现状,对三岔门的破坏原因及特征进行分析和研究,革新三岔门支护工艺,解决采动压力影响下三岔门支护难题。     

鑫珠春矿03072上风道底板加固9#钻孔的探讨研究

断层、裂隙、底板酥软等地质构造造成采煤工作面在回采过程突水或涌水，影响回采，还可能淹面造成更大的事故。目前，采用超前预注浆技术对采煤工作面的底板进行加固，对采面内裂隙、断层的导水通道进行封堵，达到采面安全回采。但在底板加固，裂隙、断层导水通道封堵过程中受力传递的影响，使上下两巷出压力增大，出现底鼓，支架严重变形等，对巷道造成破坏，无法使用。通过分析研究，发现钻孔施工参数及操作工序对其影响非常大，对此，文章总结出了一些关键的施工环节。经过9#孔实验，取得非常好的效果。     

松散厚煤层煤壁片帮漏顶控制技术的应用

石炭井焦煤分公司是开采深度大的老矿井,隶属神华宁夏煤业集团公司,煤矿进入三水平的开采,主采4#煤层平均煤厚为5.6m,平均倾角23°。煤层节理发育,顶、底板裂隙发育,煤岩十分破碎,属于"三软"松散厚煤层,本文通过现场摸索和实践,在松散厚煤层取得了很好的成效,对于今后此类工作面的开采,留下了宝贵的经验和一定的借鉴意义。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.