湿陷性黄土地区铁路房屋地基处理方法

通过梳理湿陷性黄土成因及各地基处理方法的适用范围、优缺点,结合黄韩侯铁路房屋湿陷性黄土地基处理方法的工程实例,以技术经济分析方式得出了湿陷性黄土地区铁路房屋地基处理的一般方法,对湿陷性黄土地区铁路房屋的修建具有很好的借鉴作用。     

土工带加筋垫层中筋带应力的研究

对玻塑土工带加筋垫层中筋带应力的发挥进行研究。设计了8种不同筋带布置的加筋垫层并进行载荷试验,测得各种加筋垫层地基的变形曲线、极限承载力及极限平衡时垫层内筋带的应力值。对数据进行分析后发现,筋带应力的大小是影响加筋垫层力学性质的决定因素。筋带应力的发挥与筋带布置参数首层加筋距、加筋距、加筋密度、加筋层数等有很大的关系。对加筋垫层的作用原理进行理论分析后,提出使筋带应力充分发挥的筋带布置方案。     

Application of Spacer Fabric for Protecting Cushion

Spacer fabric is a typical three-dimensional fabric, including upper layer, lower layer, and spacer layer. It is widely applied in protecting cushion products for unique space structure, which attributes good comfortability to infants and the disabled elderly in reducing diseases resulting from hot and humidity under long-time sitting and lying period. It necessitates studying the microenvironment change between body and clothes and corresponding performance. Compressibility. air permeability, heat and moisture permeability, and bending and humiture in microenvlronment of spacer fabric are analyzed and compared with foam cushion and nonwoven cushion. Experimental results show that corresponding performance of spacer fabric is better in protecting cushion than those of foam and nonwoven. Compared with traditional foam cushion and non-woven cushion, spacer fabric is more suitable for protecting cushion, and provides an alternative and optimal cushion material in medical products to protect infants and the disabled elderly from bedsores resulted from long-time sitting and lying.     

软土地基下11m高沉井施工技术

给排水工程中，对埋深较大而横截面尺寸相对不大的构筑物，采用大开槽施工将会造成占地面积大、土方量多等弊病，有时还受到施工场地限制。为此，常采用沉井法施工。沉井法适用于高地下水位、土质松软、流砂地段以及现场狭窄地段修建深埋构筑物。本文中沉井体积大，故采取先开挖再采用砂垫层很上铺承垫木扩大刃脚的施工技术。     

国外新型汽车电子技术的开发和应用

要使我国的汽车工业在日益激烈的市场竞争中获得优势，必须不断引进和开发相关新技术。就当今国外新型汽车的汽车电子防盗、撞车自动报警、人身保护气袋、车胎泄气报警和夜视等五系统的基本结构、工作原理及存在问题进行综述和分析，提出改进设想，以便更好地开发和应用这些电子技术，优化国产汽车性能，全面提高其质量。     

浅论加筋土垫层的设计和施工

本文介绍了某住宅小区，在处理Ⅲ类中软地基上构筑建筑物时，采用土工合成材料作为加筋材料换填灰土垫层，形成加筋垫层，有效地减小了地基变形，增强了地基的稳定性，并达到了预期效果。     

基于FDM-PFM耦合方法的刚性桩复合地基性能

为揭示褥垫层颗粒材料的力学本质,深入研究其对刚性桩复合地基性能的影响,开发了有限差分-颗粒流(FDM-PFM)耦合方法,建立了刚性桩复合地基静载试验耦合模型;将耦合模型计算结果与某高层建筑结构现场静载试验结果进行了对比,吻合良好,证明该耦合方法有效,材料宏观、细观参数取值正确.并进一步模拟分析了不同褥垫层材料对刚性桩复合地基性能的影响,结果表明:随褥垫层刚度增大,沉降减小,桩土应力比增大,桩顶对褥垫层刺入量减小;不同褥垫层材料桩顶负摩阻区范围为中粗砂0.30L、碎石0.25 L、级配砂石0.20 L(L为桩长);随褥垫层刚度增大,负摩阻力减小,桩身轴力则增大.     

薄膜超弹性本构模型及其在空气垫中的应用

为了在有限元分析中精确地描述空气垫的力学行为,研究了空气垫聚合物薄膜的本构模型及其在空气垫缓冲性能分析中的应用.基于聚合物薄膜的单向拉伸试验,提出了一种可压缩超弹性本构模型,并通过数据拟合,获得了本构模型的参数.通过空气垫静态压缩试验和模拟的对比,验证了本构模型的适用性,并将此聚合物薄膜的本构模型应用到空气垫的有限元参数分析中,分析了充气压力对空气垫性能的影响.     

气垫导轨上瞬时速度的测量与修正

通过对气垫导轨上运动滑块瞬时速度测量方法的研究,揭示测速原理的本质,即无限取微逐渐逼近的方法。并对此方法带来的系统误差进行相应的说明和修正。     

Air cushion furnace technology for heat treatment of high quality aluminum alloy auto body sheet

The process characteristics of heat treatment of aluminum alloy auto body sheet and the working principle of air cushion furnace were introduced. The process position and irreplaceable role of air cushion furnace in the aluminum alloy auto body sheet production was pointed out after the difficulty and key points in the whole production process of auto body sheet were studied. Then the development process of air cushion furnace line of aluminum alloy sheet was reviewed, summarized and divided to two stages. Based on the research of air cushion furnace, the key technology of it was analyzed, then the key points on process, equipment and control models of air cushion furnace for aluminum alloy auto body sheet in future were put forward. With the rapid development of automotive industry, there will be certainly a new upsurge of research and application of air cushion furnace for heat treatment of aluminum alloy auto body sheet.