共查询到19条相似文献,搜索用时 46 毫秒
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介绍了一种用于钻机功率测试的转矩转速传感器,论述了该类传感器的基本工作原理、标定装置、校验方法以及测试系统的组成等问题。 相似文献
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一九八一年,地质部水文地质技术方法研究队、六机部七○四研究所和勘探技术研究所协同在天津探矿厂生产的SPC—300H型水文水井钻机上使用了DTM—1型数字扭矩转速测量仪(以下简称扭矩仪),现将使用情况介绍如下。一、SPC—300H型水文水井钻机传动原理图、转盘参数及扭矩仪安装部位(见图1) 相似文献
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使用金刚石钻进,钻头的寿命是一个很重要的问题。钻头的质量、金刚石的品级、钻进规程都影响钻头的寿命。在钻进时我们一定要使用合格的钻头,严格遵守钻进规程和钻进注意事项,以免造成非正常损坏而使钻头寿命降低。钻头的寿命与钻进规程有密切关系。在钻进规程的三个参数中,对于孕镶钻头来说,转速对钻速的影响尤为突出。因此,分析转速与钻头寿命的关系是很重要的。现在假设使用的钻头是合格的;钻进压力是恒定 相似文献
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在京西煤田勘探应用正循环和反循环空气潜孔锤钻进的三年多实践中,我们深感如何确定潜孔锤钻进的最优转速是至关重要的.它是潜孔锤钻进中与上返风速同等重要的两大工艺参数之一. 相似文献
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磁带记录中使用的循环冗余校验编码李文印周斌王树明(长春地质学院计算机科学系,长春130026)在数据处理系统中,磁带机是最主要的数据存储设备之一。例如在数字测井仪中,测井的数据从产生,经过传输、计算、再传输,直到最后记录到磁带上,中间要经过很多环节,... 相似文献
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GW-20型工程钻机是以机械传动为主的转盘回转式岩土工程钻机,适用于φ2.0m以内各种复杂地层的桩基成孔施工.根据总体设计方案,运用岩土工程施工理论确定钻机转盘转速与扭矩参数是本钻机研发的主要内容之一.根据全断面钻进额定直径φ2.0m,深80m桩孔的施工负荷要求,运用机械工程设计方法确定转盘转速和扭矩参数. 相似文献
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局域化改进集合卡尔曼滤波(EnKF)可以克服EnKF方法在使用小集合时,对参数识别精度较低的缺陷,其能同化
地下水位观测数据有效识别渗透系数场。实际工作中,溶质运移数据也较容易获得。崔凯鹏(2013)尝试增加溶质运移
数据以改进只同化水流数据对渗透系数的估计结果,但是精度提高有限。本文在其基础上修改模型,进一步增加溶质注
入井,探究同时同化水头和溶质运移数据,对渗透系数场识别效果,之后对比了局域化EnKF与非局域化EnKF参数识别结
果,并分析了溶质影响范围与参数识别的关系。结果表明:同时同化溶质运移和水头资料,比同化单一种类观测数据识别
的渗透系数精度更高;相同实现数目下,局域化EnKF比EnKF对渗透系数场的估计结果与真实场更为接近;仅考虑溶质影
响范围内的渗透系数,同化水头数据在最后时刻参数识别结果好于同化溶质运移数据参数识别结果,但差别不大。 相似文献
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《International Geology Review》2012,54(6):516-533
An integrative approach combining carbon-isotope stratigraphy, biostratigraphy, and sequence stratigraphy was used to correlate between and place tentative age constraints on previously undated Neoproterozoic-Cambrian units of the Death Valley and White-Inyo successions, southern Great Basin, United States. Two regionally correlatable disconformities have been identified in the poorly fossiliferous, pre-trilobite strata. By comparing the carbon-isotope trends in the succession to a hypothetical global reference curve, the temporal magnitude of each hiatus can be postulated. The younger hiatus approaches 30 m.y. in duration and separates strata (Hines Tongue/basal Stirling unconformity) between 580 Ma and 550 Ma. The older hiatus represents ~10 m.y. and separates strata (Wyman-Reed and upper Johnnie unconformity) between ~590 and 580 Ma. The unconformities may be related to global sea-level fluctuations in response to Neoproterozoic (“Snowball Earth”) glacial events or tectonic activity as predicted by thermal subsidence models, and as such, may provide critical data to evaluate these global phenomena. 相似文献
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卢存恒 《华东地质学院学报》1999,22(2):101-108
阐述了在地面标定航测仪时,根据γ射线的叠加原理和六边型面源特点,以有限面源代替无限面源,建立的计算公式和实测结果,以及在空中标定航测仪时,根据γ射线的互换原理,以单点源代替无限面源,建立的计算公式和实测结果。通过理论分析,算出了航测仪接收γ射线时晶体底侧面的接收比,得出底面接收γ射线随高度是按金格函数规律衰减的数学表达式,并按该规律根据底面接收计数率的(按接收比由底侧面接收总计数率中分出的)地、空 相似文献
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在非开挖水平定向钻进过程中,泵量与钻进速度是2个关键施工参数,泵量与钻速匹配与否将直接影响钻进成孔质量和施工进度,而国内外对这方面的研究较少,没有形成成熟的理论体系,现场施工大多靠经验来估算取值。运用数学解析方法,并考虑钻屑含量的影响,建立泵量与钻速相匹配的计算模型,再结合现场实测数据进行验证。实践表明该模型比较符合实际,对现场施工有一定的指导意义。 相似文献
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Results of geodetic and geotechnical monitoring of subsidence for Taiwan High Speed Rail operation 总被引:1,自引:0,他引:1
Taiwan High Speed Rail (THSR), which began operations in January 2007, passes through an area in Yunlin County where the largest
cumulative subsidence measured during 1992–2006 exceeds 100 cm. Leveling benchmarks, GPS pillars and multi-level monitoring
wells were deployed in this area to collect detailed subsidence data from October 2003 to 2006. Leveling is carried out on
both ground benchmarks and survey bolts attached to THSR columns. Minimum constraint solutions of leveling networks produce
estimated heights accurate to a few mm. Special attention is paid to code smoothing, ionospheric, tropospheric and ocean tidal
loading (OTL) effects, so that height estimates from GPS are optimal. Leveling and GPS-derived height changes are consistent
to 1 cm, and show that from Stations 210 to 240K of TSHR, the subsidence is bowl shaped. Measurements of sediment compaction
in specific depth intervals at three monitoring wells indicate that most of the subsidence is caused by sediment compaction
at depths from 50 to 300 m. The major compaction occurs in the interval 220–300 m and is attributed to ground water withdrawal.
Large angular deflections as determined from subsidence measurements are detected at some columns, but are below the upper
bound (1/1,000) of tolerance specified in the safety code. With the current subsidence and sediment compaction, no significantly
reduced loading capacity of the columns is expected to occur. For a safe THSR operation, subsidence and sediment-compaction
monitoring should be continued, and current ground water withdrawal in Yunlin must be reduced or stopped. 相似文献
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利用建立人模拟旋喷装置,对喷浆提速进行了研究。模拟试验成果及初步分析表明,适当提高喷浆速度,不会影响成桩质量,在广州工地施工试验表明,钻孔孔口反浆后,中速喷浆,可节约水泥,而桩的承载力不变。 相似文献