共查询到20条相似文献，搜索用时 62 毫秒
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三重管高压喷射注浆在基坑隔水帷幕中的应用 总被引：2，自引：0，他引：2
三重管高压喷射注浆就是采用分别输送水、气和浆液3种工作介质的三重注浆管，使高压水、压缩空气冲击破坏土体，再让水泥浆液与土体搅拌混合，形成渗透系数为10^-7cm/s的固结体的岩土施工方法．它分为定喷和旋喷两种形式，适宜于地基加固和基础防渗． 相似文献
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通过单轴抗压试验，剪切试验，变形试验及渗透性试验等方法，对旋喷固结体的物理力学性状和渗透性进行了研究。结果表明，旋喷固结体具有良好的物理力学性质和较低的渗透性，呆完全发迹天然土的性质。 相似文献
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通过单轴抗压试验、剪切试验、变形试验及渗透性试验等方法，对旋喷固结体的物理力学性状和渗透性进行了研究。结果表明：旋喷固结体具有良好的物理力学性质和较低的渗透性，可完全改变天然土的性质。 相似文献
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该文描述了旋喷注浆在地下２４．８－２８．３ｍ深处两条３．５ｍ直径质构隧道连接中的应用。两隧道交接处的地层主要为松散的中细粒砂土,其间夹有一些坚固的细粉砂透镜体和坚硬的砂性土。这些坚硬减小了水射流的作用范围。采用与标准旋喷注浆不同的特殊参数与工艺,这一问题得到了解决使得旋喷桩径达到了１．６ｍ。另外,在完成导向孔钻进后,用测斜仪对其进行了垂直精度测量,以确保注浆固结体的均匀性。两质构隧道以成功地连接。 相似文献
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旋喷式注浆是一种利用高速喷射的射流,将孔壁附近一定范围内的土、砂等松散岩层破坏,并使其与喷射的水泥浆混合、凝结的注浆方法。目前,这种方法主要用于地基加固处理,但实践表明,在钻探施工中,对固结易坍塌地层孔壁,也很有实用价值。 相似文献
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为了在一定程度上解决钻探生产中遇到的一些复杂钻孔的护壁问题,在规范高压旋喷水泥浆护壁技术的主要工艺流程基础上,通过地表旋喷喷射能力及水泥固结体抗压试验,确定了高压旋喷水泥浆护壁技术的基础参数。并将该技术应用到福建永定乌石下和贵州省开阳磷矿洋水等不同矿区多个钻孔中,形成一系列解决方案,取得了良好的效果。 相似文献
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不同水泥土混合桩周围土体的扰动与强度恢复 总被引：1，自引：0，他引：1
针对由深层搅拌法或高压旋喷法施工的水泥土混合桩周围土体的扰动与强度恢复的问题,采用两种常用的施工法：高压旋喷混合法（简称旋喷法）和水泥浆搅拌混合法（简称湿法）,在日本有明黏土中施工以观测周围土体力学特性的变化。测试结果表明,水泥土混合桩周围土体的扰动程度与其施工方法有关;两种不同施工方法施工后周围土体的当日强度与原状土的强度之比分别是0.42（旋喷法）和0.68（湿法）,施工30 d后,旋喷法有44 %,湿法有40 %的初始强度得到恢复。结果亦表明周围土体模量恢复要慢于强度恢复的速度。 相似文献
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旋喷注浆法在达成铁路金堂滑坡治理中的应用 总被引：3，自引：1，他引：3
本文以达成铁路金堂滑坡为例，介绍三重管旋喷注浆工艺和质量检查手段，阐述了旋喷注浆改善滑带土特性，提高滑带（面）抗剪强度，达到治理滑坡的效果。 相似文献
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《岩土力学》2021,(2)
为了探讨高压注浆钢花管微型桩在真实受力状态下的抗滑特性,开展了高压注浆钢花管微型单桩和群桩加固滑坡的足尺模型试验,以及重力注浆微型单桩加固滑坡的对比试验。结果表明:高压注浆能够劈裂桩周土体,在滑动带形成树根状的胶结体,显著地改善滑坡土体的力学性能,增强桩体抵抗变形的能力,减小桩体的弯曲变形,致使滑动带土体抗剪强度增加了152.5%;较重力注浆微型桩,高压注浆钢花管微型单、群桩加固滑坡的水平极限荷载分别提高了37.8%、71.2%;极限状态条件下,高压注浆钢花管群桩中后排桩承受的水平推力和弯矩最大,前排桩次之,中间桩最小,从坡体后缘向前缘弯矩最大位置处桩身混凝土由挤压破坏转变为张拉破坏。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
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. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
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. 相似文献
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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
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). 相似文献
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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 相似文献
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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), 相似文献
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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- 相似文献
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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- 相似文献
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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.) 相似文献
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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 相似文献