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在进行超长地下室的设计时,混凝土裂缝的控制是一个很重要的课题。由于水泥在水化反应中释放的水化热所产生的温度变化和混凝土收缩的共同作用,会产生较大的温度应力和收缩应力,这将成为超长地下室结构出现裂缝的主要因素。本文介绍对超长地下室如何有效设置后浇带以及其他一些控制和抵抗温度应力和收缩应力的具体设计措施。 相似文献
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某工程坑中坑塌滑原因分析及加固设计 总被引:3,自引:1,他引:2
基坑支护结构设计中,坑中坑的设计直接影响到基坑支护结构的安全和经济,况且不少基坑支护结构的工程事故与坑中坑的不合理设计密切有关。结合某土钉墙基坑支护结构失稳的工程实例,分析了基坑支护结构失事的根本原因,提出了基坑支护结构的加固设计方法,同时也提出了基坑支护结构设计中坑中坑的设计方法,研究了基坑支护结构与坑中坑之间的相互制约和相互影响。研究表明,坑中坑对地下室基坑支护结构的整体稳定性影响较大,而基坑支护结构对坑中坑中的支护桩的内力影响相对较小。 相似文献
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全书较系统、全面地介绍了地下结构设计、施工的基础理论和方法。书中设计与施工的例子大都来自近年的实际工程,专业涵盖了工业与民用建筑、交通运输、人民防空、岩土工程等领域。全书共分3篇23章,第1篇内容包括地下工程的分类及特点、土的基本性质及工程分类、设计计算理论等。第2篇主要介绍地下室设计、基坑支护、盾构设计、钻爆法、沉管、顶管、沉井的设计。第3篇介绍了深基坑施工的各种方法,有:逆作法、地下连续墙、箱涵等施工方法,最后介绍了地下工程的降排水技术、施工组织设计等。每一章的设计与施工都配有实例。第1篇 地下工程基本知识:第1章绪论;第2章土的基本性质及工程分类;第3章 地下工程结构设计计算理论。第2篇 地下工程设计:第4章地下工程建筑设计;第5章附建式地下室的结构设计;第6章基坑支护结构设计;第7章盾构衬砌结构设计;第8章钻爆法隧道结构设计;第9章沉管法结构设计;第10章顶管工程结构设计;第11章沉井结构设计。第3篇 地下工程施工:第12章深基坑工程施工;第13章 地下连续墙施工;第14章沉井施工;第15章盾构法施工;第16章顶管法管道施工;第17章逆作法施工;第18章隧道钻爆法施工;第19章箱涵施工;第20章沉管法隧道施工;第21章新奥法(NATM)施工技术与监控量测;第22章地下工程防排水施工;第23章 地下工程施工组织与管理。 相似文献
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根据现行规范要求,甲类防空地下室外墙不得高出室外地面,但在实际防空地下室建设中,有许多山地、坡地等场地的地势一面或三面高出室外地面,为了充分发挥防空地下室的作用,通过对高出地面的防空地下室外墙进行设计处理,解决了防空地下室外墙高出室外地面的问题,在防空地下室建设中具有现实意义。 相似文献
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传统双排桩单门架式支护结构是软土地区基坑支护设计中常用的一种支护手段,由于其施工简便、不需设置内支撑、投资小并节约场地而被经常采用。但在深厚软土超大型基坑且中等开挖深度时采用,往往会出现基坑侧向位移大、沉降大、结构稳定性差的问题。结合对传统门架式支护结构的改进,在软土大型中等深度开挖基坑工程中提出了不设内支撑的双门架式支护结构形式,进一步提高支护结构整体安全稳定性和控制支护结构侧向位移,通过将该结构设计应用于绍兴县一小区项目地下室基坑支护工程,验证了该改进方法的适用性和可行性,为今后类似工程提供了宝贵的经验。 相似文献
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基于支持向量机(SVM)和独立分量分析(ICA)建立了超长大直径钢管桩极限承载力的预测模型。先采用独立分量分析FastICA算法从实际工程的超长大直径钢管桩试桩的实测数据样本中抽取相互独立的分量,这些分量不仅去除了相关性,还保持统计独立,并服从非高斯分布,能更好地表现数据间的本质结构;然后,确定支持向量机作为分类器,以抽取的独立分量作为支持向量机模型的输入参数,建立超长大直径钢管桩的承载力预测模型ICASVM_Q;最后,采用某大桥的工程数据对预测模型进行测试。结果表明,ICASVM_Q的预测效果明显优于以原始数据作为支持向量机模型输入的SVM_Q模型的预测效果。可见,采用将独立分量分析与支持向量机相结合的方法建模预测超长大直径钢管桩的承载力是可行的,ICASVM_Q模型的预测结果可用于超长大直径钢管桩承载力的设计参考,具有一定的工程应用价值。这种方法还可以用于其他领域的智能预测研究中。 相似文献
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This paper presents a review of the Quaternary–Recent deformation field and mountain building processes within the Gobi Corridor region of Central Asia, which includes the North Tibetan foreland, Beishan, Gobi Altai and easternmost Tien Shan. The region can be considered the ‘soft core’ of Central Asia which has been reactivated due to the continuing Indo-Eurasia collision to the south. Favourable preconditions for reactivation of Gobi Corridor basement include a mechanically weak Palaeozoic terrane collage sandwiched between rigid Precambrian basement blocks to the north and south, thermally weakened crust due to Jurassic–Miocene volcanism and widespread Palaeozoic–Mesozoic granitic magmatism with associated high radiogenic heat production, and crustal thinning due to widespread Cretaceous rift basin development. The network of Quaternary–Recent faults within the entire region defines a diffuse sinistral transpressional deformation field that has generated a transpressional basin and range physiographic province. Typically, thrust and oblique-slip thrust faults are WNW-striking and reactivate basement faults and fabrics, whereas left-lateral strike-slip faults are ENE-striking and cut across basement trends. The angular relationship between SHmax and pre-existing basement structural trends is the fundamental control on the kinematics of Late Cenozoic deformation. Along-strike and across-strike growth and coalescence of restraining bends, other transpressional ranges and thrust ridges is an important mountain building process. Thrust faults throughout the region are both NNE and SSW directed and thus there is no common structural vergence, nor orogenic foreland or hinterland. Root structures appear to be vertical faults, not low-angle decollements and flower structure fault geometries within individual ranges are common. Published earthquake and geodetic data are consistent with a diffusely deforming continental interior region with tectonic loading shared amongst a complex network of faults. Therefore, earthquake prediction is likely to be more complex than in plate boundary settings and extrapolation of derived Late Quaternary fault slip rates is not straightforward. Modern mountain building within the Gobi Corridor demonstrates that reactivation of ancient accretionary and collisional orogens within continental interiors can play an important role in continental evolution and the life cycle of orogenic belts. 相似文献
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在山地建筑设计过程中,基础设计是制约建筑形式的主要因素,解决好基础与地形之间的关系,成为房屋设计的重要任务,也是结构设计的难点。通过几种基础形式方案的比较,达到结构设计与建筑设计的和谐性,统一性,实现了房屋在复杂的山地地形中的可建设性。 相似文献
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Despite the long tradition of technical mitigation on a catchment scale in European mountain regions, losses due to mountain
hazards are still considerably high in number and monetary loss. Therefore, the concept of technical mitigation had been supplemented
by land-use planning and, more recently, local structural protection. Local structural protection includes measures directly
implemented at or adjacent to endangered objects, and has proven to be particularly cost-effective with respect to integral
risk management strategies. However, the effect of local structural protection in reducing the vulnerability of elements at
risk, and the associated consequences with respect to a reduction of structural vulnerability have not been quantified so
far. Moreover, there is a particular gap in quantifying the expenditures necessary for local structural protection measures.
Therefore, a prototype of residential building adapted to mountain hazards is presented in this study. This prototype is equipped
with various constructional elements to resist the incurring impact forces, i.e., of fluvial sediment transport and of snow
avalanches. According to possible design loads emerging from these hazard processes, the constructive design necessary is
presented, and the amount of additional costs required for such an adaptation is presented. By comparing these costs with
quantitative loss data it is shown that adapted building design is particularly effective to reduce the consequences of low-magnitude,
high-frequency events in mountain regions. 相似文献
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高层建筑结构大面积地库设计时,概念设计的重要性,控制单体建筑规则性,避免超限设计;地库与主楼相连对主楼的影响,对地基基础的分析,通过设置后浇带等手段解决高低层的沉降问题。介绍大面积地库的裂缝预防措施等设计方法,最终实现结构设计。 相似文献
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盆山关系研究的基本思路、内容和方法 总被引:18,自引:0,他引:18
盆地和造山带作为大陆岩石圈表面发育的两个基本构造单元,在空间上相互依存,在物质上相互转换和在地表形态上相互调整、均衡,两者具有密切的耦合关系。不同时期原始盆山结构、山脉变形样式、盆地充填格架及主要构造带、构造地块展布是盆山关系研究的几何学问题;山盆之间的叠加、转换和迁移历史,山脉基底和盖层剥露过程、折返机制,隆升过程,盆地的沉降方式、沉积记录和物源类型,造山带剥蚀物质的去向,山脉剥蚀量,造山带的增生方式等是盆山关系研究的运动学问题;盆山系统反映出的造山过程、区域动力学背景、深部流变学机制和调整过程及盆山演化动力模拟是盆山关系研究的动力学问题和最终目标。盆山关系研究的内容可初步确定为,不同时期的盆山几何配置关系,盆地层序地层序列与多幕构造控制关系,盆地沉积物物源与山脉剥露过程关系,盆地沉降与山脉隆升关系,地表过程与构造作用关系,盆山系统演化动力学。 相似文献
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雪峰山隧道为深埋特长隧道。在该隧道的勘察过程中运用了大量高新技术,并开展了科研工作,对隧道围岩特性、地质构造、地应力场及岩爆、涌水量、围岩稳定性等与隧道设计、施工密切相关的问题均作出了准确的判断和预测。本文论述了一些新的勘察技术及科研成果,这些勘探与评价技术对其它深埋特长隧道有较好的借鉴作用。 相似文献
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浅谈工程地质选线对山区高速(高等级)公路工程造价的影响 总被引:1,自引:0,他引:1
陈国照 《地质灾害与环境保护》2006,17(1):101-103
近年来,高速(高等级)公路建设发展迅速,降低公路工程造价是公路建设决策、设计、施工、管理等环节所必须考虑的问题。山区地质条件复杂,重视公路工程地质选线工作,深入现场调查,充分发挥遥感、物探、钻探等勘察手段在公路上的应用,是降低山区高速(高等级)公路工程造价最有效的途径。 相似文献
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He Bizhu Xu Zhiqin Jiao Cunli Cui Junwen Wang Shenglang Wang Gonghuai Li Zhaoyang Qiu Zhuli 《中国地质大学学报(英文版)》2009,20(2)
Utilizing the new data of gravity, magnetic, and magnetotelluric survey, we analyzed the characteristics of the three geophysical attribute (gravity, magnetic, and resistivity) interfaces and the deep architecture and structure of Kumkuli basin. The research results can provide basic data for early basin structural study. From coupled basin and mountain system, analysis of the structure, and evolution of Knmknli basin, we found that there was zoning from north to south and from west to east. Kumkuli basin has three structural architecture layers including metamorphic crystallization basement, fold basement and sedimentary cover. Knmkuli basin can be divided into three structural units, two depressions, and one uplift. Structural evolution of the Kumkuli basin can be divided into five evolution stages, including Kumkuli microcontinent formed in Sinian-Ordovician, suture around Kumkuli basin formed in Eopaleozoic, retroarc foreland basin formed in Neopaleozoic, rejuvenated foreland hasin developed in Mesozoic, and strike slip and compression basin developed in Cenozoic. 相似文献
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《International Geology Review》2012,54(6):1057-1067
The Zeya-Bureya plain and its mountain fringe are components of the Mongolo-Okhotsk folded belt, a northern segment of the East Asia Hercynian structure located between the ancient Siberian and Chinese platforms. The basement is a complex combination of Proterozoic, Sinian-lower Paleozoic and middle Paleozoic folded structures. In the Tomesk synclinorial zone, what appear to be parageosynclinal middle to upper Paleozoic structures, rest directly on Proterozoic crystalline foundation, and are correlative with similar formations in the western slope of the ancient Bureya-Girin massif. Structural trends in the southern half are north-northeasterly and north of latitude 52°; the trend is sublatitudinal. Deep rifts have been particularly important in the tectonics of the region. Regional Mesozoic structure shows inherent features from earlier stages, expressed in Paleozoic structural trends and faults. The largest and deepest of the Mesozoic troughs are associated with Paleozoic synclinoria and uplifts; swells are associated with pre-Sinian basement highs and Paleozoic anticlinoria. Maps showing geophysical anomalies and fields and tectonic features are included.—C. E. Sears. 相似文献