共查询到20条相似文献，搜索用时 148 毫秒
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汽车钻设计包含的内容非常丰富，从钻探工艺及主要参数的确定，车型及动力选型，总体设计（包括强度、刚度及动刚度校核，效率及经济性校核，噪音及振动校核）以及万向轴，离合器，分动箱（或动力箱），变速箱，回转器（动力头，转盘），钻塔，加压提升及卷扬设备，冲击器，振动器，液压系统，水泵，汽车改装，专用设备（空压机），附属设备及工具，仪表及自动化等等的选型及设计等。这里只把汽车钻设计中的动力部分作一简要探讨。在探讨汽车钻设计之前，首先必须给汽车钻下一简要的定义，以便把以往的含混的概念加以区别，也便于问题的探讨。 相似文献
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铀是国防及国民经济建设中重要能源之一。今后随着和平利用核能领域的不断拓宽，将越来越显示其重要性，浙江铀矿资源及成矿信息比较丰富，迄今为止，已发现不少铀矿床，矿（化）点及大量异常点（带）。它们的分布几乎遍布全省各个地区。本文试图通过对浙江地质构造（包括深层构造，地层岩性，岩浆岩，断裂构造，中生代火山构造）及铀矿资料的综合整理，全面总结它们的基本特征及朴素关系。阐明本省铀矿成矿条件及时空分布规律，为今后深入找矿提供依据。 相似文献
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城市,海洋及海岸带建设中的重大工程地质问题 总被引：1，自引：0，他引：1
刘玉海 《水文地质工程地质》1997,24(2):39-42
本文对城市，海洋及海岸带建设的重大工程地质问题的研究进行了分析，总结，内容涉及及建筑场地岩土体工程地质问题，人工地基与深基基础工程地质问题，城市地质环境及工程地质问题，海洋及海岸带工程地质问题等。 相似文献
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北京密云水库水 库区工程地质问题，主要包括，库区区域新构造及地质问题，水库诱发地震问题，水库渗 漏，水库边岸再造，对公路及其它建筑的影响问题，地下水水浸没问题水库固体迳流物质来源及水土保持问题，水库环境地质问题。 相似文献
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郑州市某千米地热井水温、水量及水质发生变化，，采用修补及酸化处理的工艺，处理后水温、水量及水质均达到了要求。介绍了处理技术及处理效果。 相似文献
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浅议地球系统的复杂性及非线性 总被引：1，自引：0，他引：1
结合复杂性科学的产生及发展历程，认为复杂性科学对研究地球系统复杂性及非线性具有重要的理论指导和方法论意义。同时，在论述地球系统基本属性的基础上总结了地球系统复杂性及非线性的具体表现，即地球系统的层次性，无特征尺度性，开放性，相干性，临界性，自组织性和其动力学行为的自相似性及分形性。认为地球系统是总体上远离平衡，时空延展的多层圈综合集成，连续开放的复杂耗散动力巨系统。随着复杂性科学和地球系统的复杂性及非线性研究的不断深入，在21世纪，地球科学研究将会取得理论上的重大突破和飞跃。 相似文献
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新疆北部福海地区处于西伯利亚与哈萨克斯坦两大古板块的汇聚带，构造活动强烈，属岛弧及弧后盆地构造环境。占古生界沉积盆地类型多种多样，有尖盆，残留海盆地，岛弧盆地，陆缘弧盆地及陆内裂隙盆地等；岩相类型齐全，深海，浅海，滨海，三角洲及河，湖，沼泽均有发育。 相似文献
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地下采矿是地面塌陷失决条件，自然重力及其他外界触发因素是其发展动因，地面塌陷受覆岩时代及岩性，采空区尺寸大小，煤层倾角，煤层厚度及开采深度，重复采动，水文条件变化，地形地势和松散盖层的影响。 相似文献
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西辽河(内蒙古)严重缺水区地下水资源及开发利用对策 总被引：1，自引：0，他引：1
西辽河(内蒙古境内)严重缺水区位于内蒙古自治区翁牛特旗一库伦旗一带。在地表水严重匮乏的干旱、半干旱地区，地下水一直是该区工业生产、城镇居民生活及农村人畜用水的主要水源，合理开发利用十分重要。通过研究地下水资源的分布特点及开发利用条件，分析地下水资源供需平衡及用水现状，提出合理开发利用地下水资源存在的主要问题及相应的对策与建议。研究表明，只有查明地下水储量，对地下水实行统一规划，统一管理，防止水污染，提倡节约用水，积极推行地表水和地下水联合调度，才能合理开发利用地下水资源。 相似文献
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The engineering characteristics of soils are controlled by the state of the microstructure of soils to a great extent. With
the withdrawal of groundwater controlled reasonably, the engineering-environmental effect of the high-rise building group
becomes the main cause of land subsidence in Shanghai. This paper studied the microstructure of each soil layer under the
building loads in the centrifuge model by the scanning electron microscopy and the mercury intrusion porosimetry (MIP) for
qualitative analysis and quantitative analysis, respectively. The shape, size and contact condition of the basic unit of the
soil microstructure were analyzed. The pore structure of each soil layer was studied by MIP, and the pore distribution of
each soil layer was studied by the fractal theory. The ink-bottle effect exists in the intrusion stage in the MIP test. There
are four different fractal dimensions for silty clay of layer No. 4 and clayey soil of layer No. 8 and three different fractal
dimensions for silty sand of layer No. 7 and layer No. 9. The micro and macro mechanisms of land subsidence caused by the
high-rise building group were analyzed. 相似文献
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成层土中悬臂式地下墙内力计算等等值梁法 总被引：1，自引：0，他引：1
建筑基坑范围内的土层以成层土居多，基坑技术规范要求计算成层土的土压力时应分层计算，本文按等值梁法原理，给出了成层土中分层计算土压力，再计算悬臂式地下连续墙支护结构内力（剪力和弯矩）的方法。 相似文献
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Fathy Shaaban Ahmed Ismail Usama Massoud Hany Mesbah Ahmed Lethy Abbas Mohamed Abbas 《Arabian Journal of Geosciences》2013,6(12):4961-4972
The flood plain of the Nile River has been a safe dwelling throughout history. Recently with a growing population and vast growing urbanization, some buildings have started to experience structural damages, which are not related to their construction design, but rather to the ground conditions around the buildings' foundations. Variations in properties of the soil supporting the buildings' foundations such as soil-bearing capacity, moisture content, and scouring may eventually lead to the failure of these buildings. This study is attempting to characterize the variations in the soil properties around the City Star shopping mall, in eastern Cairo, where a large building has tilted over the past few years. This tilting may lead to the collapse of the whole building if it continues at the same rate. An integrated geophysical investigation including multi-channel analysis of surface wave (MASW), ground-penetrating radar (GPR), and 2-D electrical resistivity tomography (ERT) was used around the affected building to help detect possible causes of deterioration. The GPR data showed a soil-filled layer overlaying a thick bottom layer of higher moisture content. The MASW data revealed a middle layer of relatively low shear wave velocity sandwiched between two relatively high shear wave velocity layers. The ERT data showed an upper low resistivity layer overlying a high resistivity layer. Integrating the interpretations of the three geophysical methods provides a combined model that reflects lateral and vertical variation in the soil properties. This variation becomes dramatic near the tilted corner of the building. 相似文献
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A three-dimensional finite-element analysis was carried out using ABAQUS to evaluate the squeezing effects of a prestressed high-strength concrete (PHC) pipe pile, including land upheaval, lateral soil displacement, and soil stress field with depth-varying during pile-sinking. Field data used in the analysis were obtained from the settlement building project in Hefei City, Anhui Province, China. In coastal areas of China, PHC pipe piles are normally used for reinforcement of soft foundation. The changes of displacement with the increase of soil depth and radial distance during pile-sinking are simulated for both soft foundation and soft clay with an underlying gravel layer. The numerical simulation results show that there is little difference in land upheaval with soil depth during pile-sinking, and the obvious land upheaval occurs within 0.8 m from the center of the pile. The lateral soil displacement is evident within the area of 1.0 m from the axis of the PHC, decreases with the increase of radial distance during pile-sinking, and becomes negligible beyond 4.0 m. The existence of the gravel layer helps reduce soil squeezing substantially, and the soil squeezing effects during pile-sinking have less influence on the surrounding area of foundation with a gravel layer than that in a soft foundation soil without gravel layer. 相似文献
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对钍射气220Rn及其子体的来源、影响因素、测量方法、剂量评价和防治措施作了概括性的介绍与展望。环境中220Rn的来源主要有建材和地质。220Rn的影响因素包括土壤中232Th的含量、建筑材料类别与性状、建筑物的通风条件、离墙和地面距离、季节、地表γ辐射水平等。根据测量原理的不同,220Rn测量可以分为滤膜法、闪烁室法、固体核径迹法、活性炭吸附法、半导体探测法和化学方法等。220Rn子体比220Rn对剂量的贡献更加重要。220Rn防治措施包括：建材选择、增加室内空气的流动、加强通风和阻断地基中的钍射气220Rn来源等。 相似文献
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上海地区③层淤泥质粉质黏土和④层淤泥质黏土具有含水率高、流塑状态、高压缩性和强度低的特点,属于典型的软土分布区。结合工程实例,介绍了软土地区临近既有建筑物地库的深大基坑工程的设计要点,并通过理论计算、数值模拟和实施过程的监测进行对比分析。结果表明:对于软土地区深大基坑,通过围护结构形式、支撑体系的合理选型,正确制定地下水处理方式和施工工况,并加强基坑实施的过程控制,可以保证基坑本身及周边环境的安全。可为软土地区同类基坑工程的设计和施工提供参考。 相似文献