可鉆性預測:地質影響在堅硬的巖石上鉆孔

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譯文題目:  可鉆性預測:地質影響在堅硬的巖石上鉆孔(中文2900字,英文1700字,英文PDF)
摘要:調查之前通?紤]的主要隧道項目問題是預測隧道穩定。在過去常規鉆爆隧道幾年中,在堅硬的巖石上準確預測可鉆還是一個未解決的問題。鉆的性能不僅是由磨損的工具和設備決定,也由鉆井速度決定,這些是取得挖掘工程進展的標準因素。估計預測巖石可鉆性的條件可能承受很大的成本風險。因此,改進預測鉆井速度和減少磨損將是可取的。巖體的可鉆性是由各種地質力學和機械參數決定的。在相關報告的一些重大細節如巖石性質特別是地質因素與實測磨損和鉆井速度顯示出來。
鉆井速度依賴于大量的地質參數:這些主要參數包括拔節巖體,方向理(巖石各向異性)一定程度的連鎖的微結構,孔隙度和質量的膠結碎屑巖,一定程度的熱液分解和風化巖體。鉆頭磨損隨相等的石英內容增大而增大,相當于石英內所含之物決定了材料的磨損量。針對各類巖石類型不同關系著檢測相當于石英內容。砂巖少量磨損還依賴于孔隙率或質量膠結。最后,調查程序提出,這有助于改善在規劃未來的隧道項目的巖鉆。
關鍵詞  鉆 鉆井 鉆頭 磨損率 銷毀工作 各向異性 聯合間距 石英所含之物 孔隙

外文原文
Drillability prediction: geological influences in hard rock drill and blast tunneling
Abstract Usually the main subject in preliminary site investigations prior to tunnelling projects is the prediction of tunnel stability. During the past years in conventional drill and blast tunnelling, problems have
occurred also connected to the accurate prediction of drillability in hard rock. The drillability is not only decisive for the wear of tools and equipment but is —along with the drilling velocity — a standard factor for the progress of excavation works. The estimation of
drillability in predicted rock conditions might bear an extensive risk of costs. Therefore, an improved prediction of drilling velocity and bit wear would be desireable. The drillability of a rock mass is determined by various geological and mechanical parameters. In this report some major correlations of speciÞc rock properties and especially geological factors with measured bit wear and drilling velocity are shown. Drilling velocity is dependent on a lot of geological parameters: Those principal parameters include jointing of rock mass, orientation of schistosity (rock anisotropy),degree of interlocking of microstructures,porosity and quality of cementation of clastic rock,degree of hydrothermal decomposition and weathering of a rock mass. Drilling bit wear increases with the equivalent quartz content. The equivalent quartz content builds the main property for the content of wearrelevant
minerals. For various groups of rock types di¤erent connections with the equivalent quartz content could be detected. In sandstone bit wear is also dependent on porosity or the quality of the cementation. Finally, an investigation program is submitted,which helps to improve the estimation of rock drillability in planning future tunnel projects.
Key words Drillability• Drilling rate •Bit wear•Destruction work• Anisotropy •Joint spacing•Equivalent quartz content • Porosity
 

可鉆性預測:地質影響在堅硬的巖石上鉆孔

 

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