倾斜旋喷桩在深厚软基桥头跳车处治中的应用研究

受桥梁桩基与路基刚度及沉降差异影响，桥头过渡段存在着不同程度的跳车现象，对于深厚软基段则更为严重。以浙江省G15沈海高速公路深厚软基段桥头跳车工点为例，分析桥头跳车的主要成因，基于G15沈海高速公路作为交通要道的保通要求，通过方案比选，采用倾斜旋喷桩处治，提出处治方案参数及布置，可为深厚软基段桥头跳车不断通处治提供相关工程借鉴。     

西陂隧道突泥坍塌处治探讨

文章结合西陂隧道围岩地质和水文条件情况,分析了隧道突泥坍塌的发生原因,针对不同部位和对象提出了塌方体加固及处治、塌方段落的支护结构加强以及塌方影响段的支护结构处治方案,结合监控量测手段完成了突泥坍塌处治,通过运营后观测结果显示,处治方案合理恰当,效果良好,可供类似工程参考。     

山区高速公路边坡滑坡处治探讨

山区高速公路的高填、深切路段较多,且受小区域气候条件影响明显,施工自然条件和环境复杂,特别是高切方边坡施工要做到防护紧跟,监测及时,对施工方案及时进行动态优化,并充分利用专业的地质勘察,确定高大边坡的综合处治方案,达到一次根治,不留后患的目标,为施工安全和通车运营安全打下良好基础。结合本人参建的湖南省张桑高速公路第三合同段一处路堑高边坡,谈谈边坡处治方案的确定及其实施的具体流程。     

路桥地基沉降处治技术

地基沉降是路桥过渡段产生差异沉降的主要原因。对于现役公路桥头跳车病害的处治,也不可避免的会遇到地基处理问题。由于经过一段时间的运营,地基大部分已经完成固结沉降,且地基上部有路基和路面等结构层,对地基施工有一定困难,因此很少采用地基处治方案。但如果地基为软土等不良地质,且工后沉降并未完成,则必须对地基进行处理。     

公路膨胀性土路基基床病害处治

本文通过某公路在膨胀性土地段路基基床处治的措施,对膨胀性土的工程特性、病害分析和相应的工程处治措施进行了探讨。     

路桥过渡段差异沉降处治技术研究

随着公路建设的发展,路桥过渡段差异沉降所造成的桥头跳车已成为主要危害,也是摆在各国工程技术人员面前的一大难题。文章对过渡段的差异沉降的表现形式和处治技术作用性状进行了阐述,介绍了柔性搭板处治技术。     

路桥过渡段施工技术分析

路桥过渡段是道路病害的多发地段",桥头跳车"作为其直观表现形式,一直是困扰公路建设的难题。文章针对现有的桥头跳车处治措施,以处治方法消化地基沉降变形和协调变形能力为主要衡量目标,开展了路桥过渡段差异沉降处治技术的研究。     

水泥混凝土路面病害调查及评价

水泥混凝土路面的病害情况进行调查,并提出了相应的技术处治方案。     

高速公路软岩隧道初期支护下沉病害处治技术研究

软岩隧道很容易发生大变形,根据以往研究软岩大变形可能会发生在水平向、垂直向、多方向组合变形等,其中垂直向的支护下沉变形是常见的病害.本文结合某高速公路软岩大变形导致的初期支护下沉现象,对初期支护下沉的处治方案、处治过程与处治效果进行系统分析,研究提出了多种措施综合应用过程中的关键控制环节,本工程案例可为今后类似工程的病害处治提供参考.     

关于对坛百高速公路沥青路面车辙处治工程实践的研究

文章结合坛百高速公路沥青路面调查和车辙性状分析的情况,制定了多种车辙养护维修方案,并用于指导工程实践.车辙处治效果表明,微表处方案提高了路面抗滑性能,但车内外噪音较大,而NAC-10罩面和AC-13铣刨重铺方案的抗滑性能略底,但车内外噪音较小.不同的车辙处治方案各有其优缺点,需要根据工程实际情况和经济效益择优选用.坛百高速公路沥青路面车辙处治工程实践可为今后其他工程提供参考.     

Affirmative Action: The Facts, the Myths, and the Future

This article focuses on recent federal court rulings affecting preferential treatment programs mandated by affirmative action policies and programs. The article addresses the greater burden that these decisions now place on organizations to justifying race-based remedial actions, and the standards by which these actions are judged. However, the programs affected by these rulings are only those imposed by federal, state or local governments. This article also discusses the narrow scope of these decisions—what programs they have not changed. As will be demonstrated, a broad range of voluntary private sector programs remain unaffected.     

What is the value added by caseworkers?

This paper examines the efficacy of caseworkers in allocating individuals to government programs and to services within those programs. We investigate caseworker allocation of unemployed individuals to subprograms within Swiss active labour market policy in 1998. Our analysis compares the caseworker allocation to alternatives including random assignment to services and allocation via statistical treatment rules based on observable participant characteristics. Using unusually informative administrative data, we find that Swiss caseworkers obtain roughly the same post-program employment rate as random allocation to services, while statistical treatment rules, even when subject to capacity constraints, do substantially better.     

浅谈石油化工企业碱渣废水治理措施

简述石油化工行业高浓度碱渣污水的来源及成分,着重介绍不同碱渣污水处理工艺方案和工艺方案的对比。     

某高速公路隧道塌方段处理方案

以某高速公路隧道右洞K123+328～290段已完成的初期支护部分突然发生坍塌为例,介绍工程所处地质情况,初步分析塌方原因,给出塌方处理方案。工程实践证明综合处理方法可行有效,对类似工程问题具有借鉴意义。     

Evaluating job-search programs for old and young individuals: Heterogeneous impact on unemployment duration

This paper exploits an area-based pilot experiment to identify average treatment effects on unemployment duration of treated individuals of two active labor market programs implemented in Portugal. We focus on the short-term heterogeneous impact on two subpopulations of unemployed individuals: young (targeted by the Inserjovem program) and old (targeted by the Reage program). We show that the latter program has a small and positive impact (reduction) on unemployment duration of workers finding a job upon participation, whereas the impact of Inserjovem is generally negative (extended durations). These results are robust to a wide variety of constructions of quasi-experimental settings and estimators. The identification of heterogeneous effects showed that the program results were less satisfactory for young workers, for those over 40 and for the less educated. Women also benefited less from the programs. The results seem to improve slightly for young workers in the 2nd semester of implementation, but they deteriorate in the medium term. The lack of wage subsidies in the Portuguese programs may explain the minor impacts obtained, when compared to similar programs.     

Medicaid and the housing and asset decisions of the elderly: Evidence from estate recovery programs

I examine the impact of Medicaid on elderly housing and portfolio decisions by using recent state-by-calendar-year level variation in the Medicaid treatment of owner-occupied housing assets from the adoption of Medicaid estate recovery programs. Prior to the adoption of these programs, the house, which represents the most important non-pension asset to the elderly, was exempt from determining Medicaid eligibility and served as both a place of residence and a store of wealth. Adoption of estate recovery programs changed the owner-occupied housing safety net by making the house eligible for recovery by the government, which increased the implicit tax of holding owner-occupied housing. Using data from 1993 to 2004 in the Health and Retirement Study on elderly individuals, I find that state adoption of estate recovery programs makes the elderly decrease homeownership by 4.6%, decrease home equity by 15%, and also decrease the housing share of the elderly wealth portfolio. State adoption of these programs results in elderly baseline homeowners being 33% less likely to own their homes at death and more likely to use a trust as a substitute to housing in order to preserve assets and carry out bequest motives at death.     

Long-run effects of training programs for the unemployed in East Germany

Public sector sponsored training was implemented at a large scale during the transition process in East Germany. Based on new administrative data, we estimate the differential effects of three different programs for East Germany during the transition process. We apply a dynamic multiple treatment approach using matching based on inflows into unemployment. We find positive medium- and long-run employment effects for the largest program, Provision of Specific Professional Skills and Techniques. In contrast, the programs practice firms and retraining show no consistent positive employment effects. Furthermore, no program results in a reduction of benefit recipiency and the effects are quite similar for females and males.     

汽轮机组安装调试过程中的关键技术研究

汽轮机的安装是一个精度高、难度大、程序复杂的过程。文章对汽轮机组安装调试过程中的关键技术进行了深入的研究,并给出了相应的处理措施,以期为汽轮机组的安装、调试和故障诊断提供一定的借鉴。     

10kV电容器故障的成因及处理分析

近年来,电容器使用的故障发生率持续上升,对电力系统的正常作业造成了巨大的危害。文章以某地10 kV变电站站5#电容器组故障为例,分析了电容器故障形成的具体因素,并结合故障情况制定了有效的处理方案,希望对后续相关研究有所启发。     

Efficient,Pareto-improving processes

We give two optimization programs for determining whether Pareto improving local changes are possible. When they are, the programs compute them. Any procedure generating efficient and Pareto improving changes can be replicated by these programs. The two programs are dual to each other. We apply the programs to Pareto improving exchange processes and to Pareto-improving tax-tariff reforms.