复杂地质条件下深基坑土体加固技术研究

深基坑土体加固对于提高深基坑土体稳定性具有重要作用,本文以上海市轨道交通17号线中国博览会北站施工标段为研究案例;重点阐述了三轴搅拌桩和高压旋喷桩在深基坑土体加固补强施工中的技术要点,希望为深基坑土体加固施工提供借鉴。     

水泥搅拌桩的施工质量与控制分析

在工程建设过程中,有很多软土地基进行处理,将水泥搅拌桩运用到软土地基的处理中,不仅能够巩固软土地基,还可以加强软基土体的强度并且还能够提升地基的承受力。文章对水泥搅拌桩的施工质量进行介绍,并阐述了水泥搅拌桩的施工控制方法,进而使得水泥搅拌桩的施工质量能够得到保障。     

水泥深层搅拌桩施工技术的几点思考

近几年,在处理淤泥、淤泥质土、粉土、粉质粘土等软弱地基时,经常采用深层搅拌桩进行复合地基加固处理。深层搅拌桩是一种加固软土地基的新方法,是用水泥及少量添加剂就地与地基土体充分混合而成的“水泥土桩”,其对施工工艺要求较高,掌握不好容易出现质量问题。由于深层搅拌桩成桩工艺的特殊性,其施工质量及处理效果受到人们的普遍关注。据此,主要论述了深层水泥搅拌桩的正确施工工艺,同时还阐述了相关的质量控制措施。     

水泥深层搅拌桩的施工控制

近几年,在处理淤泥、淤泥质土、粉土、粉质粘土等软弱地基时,经常采用深层搅拌桩进行复合地基加固处理。深层搅拌桩是一种加固软土地基的新方法,是用水泥及少量添加剂就地与地基土体充分混合而成的“水泥土桩”,其对施工工艺要求较高,掌握不好容易出现质量问题。现主要论述了深层水泥搅拌桩的正确施工工艺,同时还阐述了相关的质量控制措施。     

三轴深层搅拌桩止水帷幕技术应用浅析

三轴搅拌桩凭借一系列优点,适用于城市建设中的基坑工程,在实际应用中收获了良好的社会效益和经济效益。文章通过阐述三轴搅拌桩的内涵特征,依托南京下沉式广场工程实例,重点厘清施工工艺关键点及试桩参数,同时针对三轴深层搅拌桩止水帷幕施工过程常见问题提出解决对策,通过桩身质量检验和工程实例实施效果验证,提高该技术运用成熟度,为类似工程施工应用提供可借鉴的思路和方法。     

明挖隧道上跨地铁施工技术

介绍郑州市郑东新区综合交通枢纽区地下道路工程上跨既有地铁1号线盾构区间隧道的施工方案,为降低明挖隧道施工的减载效应对盾构隧道管片结构的影响,采用"三轴搅拌桩加固土体+抽条法施工"的综合施工技术,保证盾构隧道结构的稳定及地铁运营列车的安全。     

五轴水泥搅拌桩施工技术在城市地铁工程中的应用

水泥搅拌桩作为城市地铁中软土地基加固的施工工法,有着成本投入小、加固效果良好、施工工法成熟的特点,在软土地基加固施工中应用广泛。随着深层软土地基加固工程质量及深度要求的提高,传统的单轴、三轴搅拌机已突出其一定的局限性,五轴搅拌机在传统三轴搅拌设备的基础上进行优化升级,在深层搅拌桩施工中突显其优越性。     

三轴搅拌桩结合高压旋喷桩施工技术

本工程地质层在九个亚层的条件下,介绍陆域止水帷幕施工采用三轴搅拌桩结合高压旋喷桩施工工艺、机械设备配置、施工质量控制;通过试验检测止水效果情况,结合检测结果,分析总结在此类地质情况下,采用三轴搅拌桩结合高压旋喷桩施工止水帷幕影响质量的重要因素,为后期类似工程提供可行性经验.     

湖相沉积土层中等直径劲性复合桩的承载力计算与分析

本文采用目前五个具有代表性规范对湖相沉积土层中劲性复合桩桩身承载力进行计算复核与分析,得出了在采用与芯桩等直径原位注浆搅拌情况下,土体经注浆搅拌后对桩身承载力依然具有较大的影响的结论。给出了在特定工程条件下注浆搅拌对桩身承载力的贡献值。劲性复合桩侧阻力调整系数对桩身承载力有较大的影响,工程中需结合地区经验综合考虑,才能得出符合实际、安全的计算结果,为工程带来合理的经济环境效益。     

结合实践深入探讨某广场深基坑的施工技术

详细介绍了某广场周边环境复杂,施工中采用三轴搅拌桩止水,钻孔灌注桩和两道钢混凝土内支撑作围护结构,用二轴水泥土搅拌桩进行坑边、电梯井和集水井深坑加固。根据时空效应原理确定了合理的开挖流程。结合采用信息化施工技术,确保了工程顺利进行。     

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.     

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.     

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.     

Capturing the Implications of Services Trade Liberalization

This paper evaluates the impact of service sector trade liberalization on the world economy by a ten-region, eleven-sector CGE model with import embodied technology transfer from developed countries to developing countries. Simulation results show that service sector trade liberalization not only directly affects world service production and trade, but also has significant implications for other sectors in the economy. The major channel of the impact is through inter-industry input-output relations and TFP growth induced from services imported by developing countries from developed countries, which may be embodied with new information and advanced technology.     

City Children and Genderfied Neighbourhoods: The New Generation as Urban Regeneration Strategy

Former industrial cities in the West are employing gentrification as urban policy. In these policies, women and families currently play an important role as gentrification pioneers. In my analysis of Rotterdam in the Netherlands, I propose the term genderfication to understand the gender dimensions of this process. Genderfication refers to the production of space for different gender relations. I analyse Rotterdam's urban planning program for becoming a ‘child‐friendly city’, which entails replacing existing urban dwellings with new, larger and more expensive ‘family‐friendly homes’ as a strategy for urban re‐generation. Urban re‐generation supplements regeneration in the form of material and economic restructuring, and refers to the replacement of part of the current population by a new and better suited generation. The ‘child‐friendly city program’ is considered in tandem with punitive ‘youth policies’.     

Hierarchical Models in Environmental Science

Environmental systems are complicated. They include very intricate spatio-temporal processes, interacting on a wide variety of scales. There is increasingly vast amounts of data for such processes from geographical information systems, remote sensing platforms, monitoring networks, and computer models. In addition, often there is a great variety of scientific knowledge available for such systems, from partial differential equations based on first principles to panel surveys. It is argued that it is not generally adequate to consider such processes from a joint perspective. Instead, the processes often must be considered as a coherently linked system of conditional models. This paper provides a brief overview of hierarchical approaches applied to environmental processes. The key elements of such models can be considered in three general stages, the data stage, process stage, and parameter stage. In each stage, complicated dependence structure is mitigated by conditioning. For example, the data stage can incorporate measurement errors as well as multiple datasets with varying supports. The process and parameter stages can allow spatial and spatio-temporal processes as well as the direct inclusion of scientific knowledge. The paper concludes with a discussion of some outstanding problems in hierarchical modelling of environmental systems, including the need for new collaboration approaches.