φ147 mm铝合金钻杆抗内外压强度试验研究          下载免费PDF全文

刘宝昌  孙永辉  孙友宏  李闯  王立臣  李宝  弗拉基米尔BbBb巴索维奇 《探矿工程》2016,43(4):63-67

铝合金钻杆因具有质量轻、比强度高、抗腐蚀性好、低磁等优点,在深井与超深井钻探作业中备受关注。在深井与超深井钻进中,铝合金钻杆需要承受巨大的内外压力,因此有必要对钻杆所能承受的最大内外压力进行计算与试验,对自行研制的φ147 mm铝合金钻杆进行了静水内、外压试验与弹性力学理论计算校核,7075铝合金钻杆在内压69.51 MPa时持续加压20 min,没有发生泄漏现象;最大抗外压值为107.4 MPa。2024铝合金钻杆在内压48.65 MPa时持续加压20 min,没有发生泄漏现象;最大抗外压值为72.3 MPa。试验表明,铝合金钻杆抗内、外压性能良好,从而保证了铝合金钻杆在深井及超深井钻进时的可靠性。  相似文献   

不损失点的二度磁异常延拓方法及精度     

孔庆大  张喜丰  赵怀珠  赵敬洗 《物探与化探》1982,6(6):339-345

在磁异常的解释推断中,较广泛地应用了解析延拓方法。人们为了了解剖面上磁异常的空间分布特点,经常把实测场值换算到上半空间或下半空间。然而,当位场在上延或下延过程中,边缘点将会受到损失,尤其在多次延拓后,边缘点损失更为严重。  相似文献   

《二度磁异常延拓方法精度的讨论》一文中的一点结论值得商榷     

孔庆大 《物探与化探》1981,5(4):250-251

《物探与化探》1980年第2期发表的《二度磁异常延拓方法精度的讨论》一文中所做的大部分结论很有意义。但是,作者在应用《磁测资料解释推断手册》中420页的二度上延公式(该文公式(4))时,由于考虑不周,某些看法尚须进一步探讨。本文就公式(4),谈点粗浅的看法,并与作者商榷。  相似文献   

绿泥间蜡石微结构的同分辨电镜观察   总被引：1，自引：0，他引：1  

孔You华  王幼文 《矿物学报》1992,12(1):7-13,T002

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山西大骨节病区环境水文地质特征及致病机理的探讨     

段堪  孔昭通 《水文地质工程地质》1980,(4)

山西省部分大骨节病病区的环境水文地质特征与非病区有显著差异。病区气候比较湿润、寒冷,昼夜温差较大,易形成凝结水,在潜水层上部形成上层滞水。病区土壤富含腐殖质,呈黑褐及灰褐色,为  相似文献   

山东半岛东部湿地生态系统服务评价及比较研究     

孔晓霞  李国庆  陈丙寅  史楚  吕婷 《湿地科学与管理》2016,(3):23-27

以山东半岛东部的烟台市和威海市为例,利用层次分析和主成分分析方法对研究区各县市湿地服务进行评价,采用自然间断法的方式将各市县湿地生态系统服务等级进行划分。结果表明:两种方法的评价原理和结果虽有差异,但都将烟台市辖区、威海市辖区划分为高生态服务地区,将栖霞市和招远市划分为低生态服务区。上述两种方法虽然评价原理不一致,但通过互相验证,更能真实地反映研究区湿地生态系统服务状态。  相似文献   

多源卫星高度计海浪资料在中国近海的验证及应用     

孔亚文  张秀芝  盛立芳  陈报章 《海洋学报(英文版)》2016,35(11):86-96

Studies of offshore wave climate based on satellite altimeter significant wave height(SWH) have widespread application value. This study used a calibrated multi-altimeter SWH dataset to investigate the wave climate characteristics in the offshore areas of China. First, the SWH measurements from 28 buoys located in China's coastal seas were compared with an Ifremer calibrated altimeter SWH dataset. Although the altimeter dataset tended to slightly overestimate SWH, it was in good agreement with the in situ data in general. The correlation coefficient was 0.97 and the root-mean-square(RMS) of differences was 0.30 m. The validation results showed a slight difference in different areas. The correlation coefficient was the maximum(0.97) and the RMS difference was the minimum(0.28 m) in the area from the East China Sea to the north of the South China Sea.The correlation coefficient of approximately 0.95 was relatively low in the seas off the Changjiang(Yangtze River) Estuary. The RMS difference was the maximum(0.32 m) in the seas off the Changjiang Estuary and was0.30 m in the Bohai Sea and the Yellow Sea. Based on the above evidence, it is confirmed that the multialtimeter wave data are reliable in China's offshore areas. Then, the characteristics of the wave field, including the frequency of huge waves and the multi-year return SWH in China's offshore seas were analyzed using the23-year altimeter wave dataset. The 23-year mean SWH generally ranged from 0.6–2.2 m. The greatest SWH appeared in the southeast of the China East Sea, the Taiwan Strait and the northeast of the South China Sea.Obvious seasonal variation of SWH was found in most areas; SWH was greater in winter and autumn than in summer and spring. Extreme waves greater than 4 m in height mainly occurred in the following areas: the southeast of the East China Sea, the south of the Ryukyu Islands, the east of Taiwan-Luzon Island, and the Dongsha Islands extending to the Zhongsha Islands, and the frequency of extreme waves was 3%–6%. Extreme waves occurred most frequently in autumn and rarely in spring. The 100-year return wave height was greatest from the northwest Pacific seas extending to southeast of the Ryukyu Islands(9–12 m), and the northeast of the South China Sea and the East China Sea had the second largest wave heights(7–11 m). For inshore areas, the100-year return wave height was the greatest in the waters off the east coast of Guangdong Province and the south coast of Zhejiang Province(7–8 m), whereas it was at a minimum in the area from the Changjiang Estuary to the Bohai Sea(4–6 m). An investigation of sampling effects indicates that when using the 1°×1°grid dataset, although the combination of nine altimeters obviously enhanced the time and space coverage of sampling, the accuracy of statistical results, particularly extreme values obtained from the dataset, still suffered from undersampling problems because the time sampling percent in each 1°×1°grid cell was always less than33%.  相似文献   

水平孔及斜孔钻进初步经验          下载免费PDF全文

铁道部第二设计院斜孔钻探试验小组 《探矿工程》1966,(2)

一、概况在开展新技术运动中,提出了锚杆挡墙及利用水平钻孔排除地下水等新技术。过去,我们从未打过水平钻孔,试验前心中是无数的。曾有两种不同看法,有人认为过去都打垂直孔,现在要钻水平孔,既没经验,也没设备,产生了怀疑。但也有人认为,只要紧紧依靠党的领导,依靠群众的智慧,困难是  相似文献   

在隐蔽地區应用光譜金屬測量普查稀有金屬偉晶岩矿床的經驗     

З.Г.克拉耶娃  О.Ф.契斯诺科夫  孔祥兴 《中国地质》1958,(11)

在森林茂密地区,进行地质普查工作是非當困难的。在这类地区普查某些矿产时,最經济和最有效的方法是金屬測量方法。1956年,我們进行了用金屬測量方法普查稀有金屬偉晶岩矿床的試驗工作。工作是在森林茂密的地区,  相似文献   

簡易刻槽取样方法在普查与勘探中的应用     

В.И.沃洛布耶夫  孔祥兴 《地质与勘探》1958,(4)

当評价所发現的許多金屬矿化现象时,往往难于固定矿体,尤其是用肉眼察觉不到的或是在难以识别的矿化作用中。如在矽嘎岩中微細分散的白鎢矿浸染;在高嶺土化作用和輕微铁化带內的次生鉛鋅矿物;在石灰岩中微細分散的方鉛矿浸染;在网狀脈体中微晶鍚石以及在細脈浸染类型矿床中貧銅矿矿染等。为了对这些矿化現象进行評价,最常用的是刻槽取样。这种方法需要消耗大批的人力和物力,因此在坑道众多的地段里,特别是在探槽的地段里,并不經常使用刻槽取样。因为主要是在有明显的矿染标誌的地段才运用它。许多研究者(如波查里斯基、M.H.阿尔波  相似文献