防空地下室外墙高出地面的技术探讨

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。     

论张杨路共同沟平战功能转换问题

本文对张杨路共同沟概况进行了简要介绍，然后分析卫其抗力以及共同沟平战功能转换的必要性和可能性，指出平战功能转换的关键是口部处理，并提出几点技术方案和结构措施，对以后的共同沟建设提出一些建议。     

人防工程平战转换浅谈

人防工程是城市地下工程的重要组成部分,是一个城市抗灾救灾不可缺少的生命线工程。通过对地下建筑工程的平战转换设计、施工、建筑材料的开发和研究,做到非人防工程在战时、自然灾害情况下能顺利、限时、安全地转换为地下掩护体。     

人防地下室设计要点分析

人防地下室是一种具有特殊意义的、具备战时防空能力的建筑,其对设计的要求很高。工程设计人员应严格遵循规范要求进行设计,避免留下安全隐患。本文结合具体工程实例,对人防地下室的相关设计要点进行了阐述,包括室外出入口、主体部分、平面布置及节能设计等方面。     

人民防空地下室工程配电系统设计浅析

人民防空地下室工程的配电设计是建筑电气的一项重要技术,而其中的配电系统又是这一技术的关键。本文结合人防工程相关规范和图集,阐述了人防工程配电中的电源、供电等方面的一般做法与关键点;对人防工程配电中的常用系统,结合规范图集与实际施工图进行了总结。     

塔楼结构对大底盘地下室的影响分析

<正>地下室作为上部结构与基础的重要过渡部位,起着重要的传力与协调作用,地下室的结构性能与受力情况直接影响着上部结构。通常情况下不考虑地下室的地震作用,但是地下室的受力却受塔楼地震作用的影响,地下室一方面承受自身质量产生的地震作用;另一方面协调着上部结构与基础,承受着由上部结构传递而来的地震反应。从力的相互作用可知,地下室对塔楼嵌固的刚度贡献有效范围也等同于塔楼在对地下室的影响范围。因此,研究上部结构对地下室的影响,对地下室及结构的整体设计都有着重要的意义。     

宁波某工程超长地下室结构设计

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。     

城市地下空间开发利用学术研讨会召开

近日,由中国勘察设计协会人民防空与地下空间分会主办的全国“城市地下空间开发利用学术研讨会”在湖北省武汉市召开。中国勘察设计协会副理事长王树平、协会人民防空与地下空间分会会长徐培义等出席并讲话。     

紧邻在建主楼桩基的地下室基坑围护设计实例

该文介绍了一个紧邻在建主桩基的地下室基坑围护设计的实例。通过对工期、施工空间、安全性以及造价的综合分析,确定了以土钉墙为主的围护方式。通过有限元计算对开挖所造成的主楼桩基与地基土的相互作用机理的分析, 表明桩对土的约束作用限制在一定的范围内。根据分析结果,在设计中采用比较大的安全系数以及开挖前的超前支护结构以控制开挖过程中主楼基础地板下地基土的侧向位移,最大限度地减少由于地下室开挖卸载而造成的主动土压力对已有主楼桩基的影响,保证在地下室开挖过程中主楼的施工安全,同时也保证了地下室已有桩基的安全。实践证明,这种方法是有效的,对同类工程的围护设计具有一定的借鉴价值。     

地下室抗浮设计及抗浮锚杆应用

大多地下建筑拟建场地均邻江、河、湖、海等或存在压力水头,自然与地下室抗浮设计密切相关。文中叙述了地下室抗浮设防水位的确定、抗浮设计及工程实例抗浮锚杆使用效果。     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H₂O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H₂O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ₁ roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003).     

HYDROGEOLOGY

正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level     

METAMORPHIC PETROLOGY

正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7),     

SERIALS

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GEOPHYSICAL EXPLORATION

正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli-     

PETROLEUM GEOLOGY

正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.)     

GEOCHEMISTRY

正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861