浅谈钢板桩在深基坑支护中的应用

以天津市南港工业区某雨水泵站出水管顶管井及进水箱涵基坑工程为例,通过对地质条件和支护方案进行分析比选,确定采用钢板桩支护方案。本文结合工程实例,讨论深基坑支护中钢板桩的实施方法,并提出了钢板桩支护结构施工便捷、节约材料的优点。     

钢板桩基坑支护施工技术

文章结合工程实际情况,阐述钢板桩基坑支护的施工技术。通过对深基坑工程周边环境及施工难点进行分析,选择钢板桩支护方案,并结合工程具体环境采取相应的施工技术,达到了预期目的。     

钢板桩基坑支护施工技术

文章结合工程实际情况,阐述钢板桩基坑支护的施工技术。通过对深基坑工程周边环境及施工难点进行分析,选择钢板桩支护方案,并结合工程具体环境采取相应的施工技术,达到了预期目的。     

钢板桩基坑支护施工技术

文章结合工程实际情况,阐述钢板桩基坑支护的施工技术。通过对深基坑工程周边环境及施工难点进行分析,选择钢板桩支护方案,并结合工程具体环境采取相应的施工技术,达到了预期目的。     

钢板桩支护在桥梁深基坑施工中的实践

为了保证钢板桩类型支护结构在桥梁项目深基坑建造中有良好的应用,应认识到钢板桩类型支护结构的重要性以及优势,并能了解钢板桩类型支护的特点和深基坑支护的具体需要,制定相应的支护施工方案。就钢板桩类型支护结构在桥梁项目深基坑建造中的应用进行了分析。     

单排桩挡墙在永久边坡支挡工程中的应用

单排桩挡墙作为永久支挡结构的应用逐渐增多,但针对其受力和变形特性的研究相对较少。本文依托深圳某地铁停车场边坡支护工程,通过理正岩土和Midas GTS NX有限元软件分别建模计算并与现场实测数据对比分析。结果表明采用理正岩土软件计算得到的桩身弯矩、剪力及变形沿桩身的变化规律与有限元分析结果基本一致。两种计算方式得到的桩顶水平位移量与现场实测结果相近。研究成果对于永久单排桩挡墙支挡结构的设计和检算具有较高的指导意义。     

单支点排桩支护与双排桩支护的对比分析

本文总结了目前将常用的单支点排桩支护和双排桩支护的计算理论,并通过对工程实例的计算结果进行对比分析,得出了双排桩支护对于单支点排桩具有更好的稳定性,可以适当的减小桩长,能有效的减小桩身弯矩等优点。     

桩锚支护下预应力对深基坑性能影响的数值分析

为了进一步研究深基坑性能及锚杆的预应力对基坑位移的影响特性,本文采用PLAXIS岩土分析软件,对甘肃商会大厦深基坑进行了预应力锚杆、基坑水平位移及支护结构性能的数值分析,分析表明:锚杆上的预应力的施加对其基坑的水平位移及竖向位移影响很大,能有效地限制基坑的侧向变形,这对于周边有建筑物的深基坑而言,是比较合理的支护形式,同时对桩身配筋有一定的影响,但是预应力的施加对其基坑的稳定性影响较小。通过此文分析,对此基坑的施工具有一定的指导作用。     

深基坑支护设计中多层土物理力学参数分算与合算的研究

以广州市五山路下沉式公路隧道的深基坑支护为例，应用等值梁方法通过对土层参数分层计算与加权平均计算所得到的桩的插入深度、支点力、最大弯矩等的结果均相差较大，对设计有较大的影响。从计算与实测结果可以看出，分层计算的结果比较合理，对类似的工程设计与施工均有指导意义，具有一定的实用价值。     

"多桩一锚"钢管护壁桩在深基坑施工中的应用

以深基坑施工为例，阐述了支护方案选择、钢管护壁桩入土深度及桩总长度、钢管的强度、角钢锚杆强度、焊缝以及锚杆拉筋的设计计算等，实践证明“多桩一锚”钢管护壁桩技术在深基坑边坡支护中取得了良好的支护效果。     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

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.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

Multinomial distributions applied to random sampling of particulate materials

When sampling a batch consisting of particulate material, the distribution of a sample estimator can be characterized using knowledge about the sample drawing process. With Bernoulli sampling, the number of particles in the sample is binomially distributed. Because this is rarely realized in practice, we propose a sampling design in which the possible samples have a nearly equal mass. Expected values and variances of the sample estimator are calculated. It is shown that the sample estimator becomes identical to the Horvitz–Thompson estimator in the case of a large batch-to-sample mass ratio and a large sample mass. Simulations and experiments were performed to test the theory. Simulations confirm that the round-off error due to the discrete nature of particles is negligible for large sample sizes. Sampling experiments were carried out with a mixture of PolyPropylene (PP) and PolyTetraFluorEthylene (PTFE) spheres suspended in a viscous medium. The measured and theoretical variations are in good agreement.     

The Early History of the Cumulants and the Gram-Charlier Series

The early history of the Gram-Charlier series is discussed from three points of view: (1) a generalization of Laplace's central limit theorem, (2) a least squares approximation to a continuous function by means of Chebyshev-Hermite polynomials, (3) a generalization of Gauss's normal distribution to a system of skew distributions. Thiele defined the cumulants in terms of the moments, first by a recursion formula and later by an expansion of the logarithm of the moment generating function. He devised a differential operator which adjusts any cumulant to a desired value. His little known 1899 paper in Danish on the properties of the cumulants is translated into English in the Appendix.