外文翻譯--掘進(jìn)機(jī)在采礦和隧道業(yè)中的應(yīng)用-資料下載頁(yè)
2025-05-12 06:48本頁(yè)面
【導(dǎo)讀】掘進(jìn)機(jī)為方便的挖掘中硬巖石提供了一個(gè)獨(dú)特的能力。因此，廣泛地被用于地下，采礦和隧道。在成功使用掘進(jìn)機(jī)方面的一個(gè)具有決定性的議題是提高機(jī)器生產(chǎn)率和降低鉆掘成本的可靠性。這個(gè)模型是從不同的掘進(jìn)機(jī)在各式各樣的地質(zhì)條件下工作為基礎(chǔ)。這篇文章也討論這一數(shù)據(jù)庫(kù)的發(fā)展和含量被源自估計(jì)掘進(jìn)機(jī)的截割率和截割頭。能耗的預(yù)測(cè)為程序。這些主要的好處就是減少了土地的占有量；同時(shí)，增強(qiáng)了工人的安全性。掘進(jìn)機(jī)是一種廣泛應(yīng)用在地下軟硬巖石的挖掘上的機(jī)器，特別是對(duì)于那些沉積巖。較好的掘進(jìn)硬巖和粉碎。的改進(jìn)發(fā)生在最近這50年。切削硬巖的能力是影響掘進(jìn)機(jī)應(yīng)用的最重要因素。一個(gè)很重要的量，關(guān)于增加掘進(jìn)機(jī)截割硬巖的能力被放置了很多年。明，截割工具仍然是截割硬巖時(shí)最大的弱點(diǎn)。除此之外，使用這種截齒，一種新的開采技術(shù)已經(jīng)被申請(qǐng)，為截割硬巖的發(fā)展起到很大的促進(jìn)。圖-2展示的是實(shí)驗(yàn)室測(cè)定的截割硬巖的圖象。
【正文】 tion, downtime analysis (roadheader related stoppages, backup system stoppages, ground and support stoppages, etc.) The Earth Mechanics Institute of the Colorado School of Mines jointly with the Mining Department of the Istanbul Technical University has established an extensive database related to the field performance of roadheaders with the objective of developing empirical models for accurate and reliable performance predictions. The database contains field data from numerous mining and civil construction projects worldwide and includes a variety of roadheaders and different geotechnical conditions. The empirical performance prediction methods are principally based on the past experience and the statistical interpretation of the previously recorded case histories. To obtain the required field data in an usable and meaningful format, a data collection sheet was prepared and sent to major contractors, owners, consultants, and roadheader manufacturers. In addition, data was gathered from available literature on roadheader performance and through actual visits to job sites. This data collection effort is continuing. The database includes six categories of information, as shown in TableI. The geological parameters in the database consist generally of rock mass and intact rock properties. The most important and pertinent rock mass properties contained in the database include Rock Quality Designation (RQD), bedding thickness, strike and dip of joint sets and hydrological conditions. The intact rock properties are uniaxial pressive strength, tensile strength, quartz content, texture and abrasivity. The rock formations are divided into separate zones to minimize the variations in the machine performance data to provide for more accurate analysis. This also simplifies the classification of the properties for each zone and the analysis of the field performance data. The major roadheader parameters included are the machine type (crawler mounted, shielded), machine weight, cutterhead type (axial, transverse), cutterhead power, cutterheadlacing design, boom type (single, double, telescopic, articulated), and the ancillary equipment (, automatic profiling, laser guidance, bit cooling and dust suppression by water jets, etc.). The operational parameters generally affect the performance of the excavator through machine utilization. The most important operational parameters include ground support, back up system (transportation, utility lines, power supply, surveying, etc.), ground treatment (water drainage, grouting, freezing, etc.), labor (availability and quality), and organization of the project (management, shift hours, material supply, etc.). CONCLUSIONS The evaluation and analysis of the data piled in the roadheader field performance database has successfully yielded a set of equations which can be used to predict the instantaneous cutting rate (ICR) and the bit consumption rate(BCR) for roadheaders. A good relationship was found to exist between these two parameters and the machine power (P), weight (W) and the rock pressive strength (UCS). Equations were developed for these parameters as a function of P, W and UCS. These equations were found mainly applicable to soft rocks of evaporatic origin. The current analysis is being extended to include harder rocks with or without joints to make the equations more universal. In jointed rock, the RQD value will be utilized as a measure of rock mass characteristics from a roadheader cuttability viewpoint. It is believed that these efforts will lead to the formulation of an accurate roadheader performance prediction model which can be used in different rock types where the roadheaders are economically applicable.
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