共查询到20条相似文献，搜索用时 421 毫秒
1.
2.
针对我国煤矿松软突出煤层中的煤巷、高应力巷道等小断面巷道,以及皮带运输巷中钻机需频繁让道、在掘进巷道中钻机需绕前施工等通过空间狭小的复杂钻孔施工条件,结合煤矿钻孔现场施工对孔比较繁琐及搬运迁移比较困难的现状,进行了ZLY2500L型煤矿用履带式坑道钻机的研制。目前常用的整体式履带钻机存在这样的缺陷：不能将井下机动灵活、外形尺寸小、操作人员安全性高等特点高度融合,使瓦斯抽采钻孔施工效率低,钻机对复杂钻场和矿井条件适应性差。该机型结构布置合理,辅助功能齐全,它能有效地改善中小煤矿钻孔施工效率,提高钻掘产量,降低工人劳动强度, 可用于瓦斯抽采穿层钻孔、瓦斯抽采顺层钻孔和探放水以及底板注浆等钻孔施工。本文主要介绍ZLY2500L型煤矿用履带式坑道钻机的主要技术参数、结构布局特点及液压系统。经试验表明,对于中小煤矿钻孔施工具有良好的应用前景。 相似文献
3.
4.
5.
6.
某地基不均匀沉降的三维分析 总被引：3，自引：2，他引：3
某地基处理原拟采用CFG复合地基。但由于地层情况复杂 ,施工难度大 ,决定采用CFG桩和人工挖孔桩进行地基处理 ,但是这种处理方案可能会引发地基不均匀沉降从而对上部结构产生不良影响 ,因此合理的的选取人工挖孔桩桩间距非常重要。通过对四种桩间距情形下地基的三维沉降分析 ,选取了合理的人工挖孔桩桩间距 ,解决了这一工程难题. 相似文献
7.
主要为大口径基础灌注桩施工而设计的YCJF-25型全液压冲击反循环钻机具有碎岩能量大、破岩效率高、排渣速度快、能有效避免孔底岩屑的重复破碎的特点。介绍了YCJF-25型全液压冲击反循环钻机性能参数,阐明了钻机的结构特点,对比分析了钻机的施工效率。 相似文献
8.
长螺旋钻机成孔CFG桩施T是近年来新兴的一项基础工程施工技术,在工程建设领域有着广泛的应用,尤其适用于对软土地基的处理。该技术施工噪声低,成桩速度快,效果好,得到了广大施工技术人员的青睐。CFG桩复合地基可以大大提高地基承载力,减小地基的沉降,进而满足设计要求。本文介绍了长螺旋钻机成孔CFG桩的成桩工艺流程、理论设计、质量控制措施,并以工程实例进行佐证,以期该施工技术得到更加广泛应用和发展。 相似文献
9.
我局第二水文工程地质队在某泵站工作施工中，需要处理一批基桩孔。这些基桩孔分布在厚度为0.4—0.6m的混凝土地基上面，由于混凝土的骨料为质地坚硬的卵石及灰岩片石，钻机钻进时跳动大，曾损坏伞齿轮两付，钻头两个。同时，施工进度慢，一个口径为600mm的基桩孔从钻进到灌桩需要6—7d时间才能完成。为了提高经济效益和赶工期，我们采用控制爆破进行开孔，然后安装钻机进行施工。 相似文献
10.
本文就法基与边坡的基础处理用钻掘设备,包括桩孔钻机、软土地基处理机、锚固钻机、微桩钻机以及连续墙成槽机等分类进行了全面的论述,并指出了国内工距、今后我国的发展方向等。文章附有表格,详细列出了世界主要厂商的系列设备产品。 相似文献
11.
Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
12.
13.
14.
正1 Introduction Geological studies established on several sections in Lanping-Simao basin have shown that the salt-bearing strata of Mengyejing formation(Yunlong Fm.in Lanping basin)are constituted by an alternation of salt layers and interbedded facies.The latter consists mainly of mudstones,and mudstone-rich conglomerate.The mineralogy and geochemistry of salt-bearing beds and 相似文献
15.
正On 22nd April 2014,with the approach of the 45th World Earth Day,China’s Ministry of Land and resources issued the status of China’s mineral resources in 2013.The first task of the prospecting breakthrough strategy action implemented in the last five years has been completed,and China’s security capacity for mineral resources has been significantly improved.In the 相似文献
16.
正There are more than 700 salt lakes with area of more than 1km2 on the Qinghai-Tibet Plateau of China.In recent years,an oilfield brine was also found in the Nanyishan Section of Qaidam Basin in the Qinghai-Tibet 相似文献
17.
正1 Introduction Physical and numerical models are constructed to investigate the evolution and mechanism of salt migration driven by tectonic processes.In recent years,we have designed and ran series of models to simulate salt 相似文献
18.
YUAN Qin LI Jianguo QIN Zhanjie WEI Haicheng SHENG Shurong SHAN Fashou 《《地质学报》英文版》2014,88(Z1):276-276
正The study of Cretaceous-Palaeogene salt-bearing strata of the Khorat Basin Laos and the Lanping-Simao Basin in Yunnan,China has an great significance not only in explaining the basin evolution and the genesis of potash 相似文献
19.
正Potash is one of the long-term scare deposits in China,and potash prospecting has long been listed as a key brainstorm project for our nation and geological prospecting units.There have been considerable studies in search for potash deposits in the Kuqa depression of the Tarim basin(Jackson et al.,1991;Gemmer et al.,2004;Vendeville,2005;Vendeville and Jackson,1992a,1992b), 相似文献
20.
正1 Introduction Qaidam Basin in Qinghai,including 43 salt lakes with multiple dominant mineral such as potassium,magnesium,lithium etc.,is the most intensive distribution of Saline 相似文献