Rate of penetration(ROP) of a tunnel boring machine(TBM) in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project. The objectives of this work are to compare the accu...Rate of penetration(ROP) of a tunnel boring machine(TBM) in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project. The objectives of this work are to compare the accuracy of prediction models employing partial least squares(PLS) regression and support vector machine(SVM) regression technique for modeling the penetration rate of TBM. To develop the proposed models, the database that is composed of intact rock properties including uniaxial compressive strength(UCS), Brazilian tensile strength(BTS), and peak slope index(PSI), and also rock mass properties including distance between planes of weakness(DPW) and the alpha angle(α) are input as dependent variables and the measured ROP is chosen as an independent variable. Two hundred sets of data are collected from Queens Water Tunnel and Karaj-Tehran water transfer tunnel TBM project. The accuracy of the prediction models is measured by the coefficient of determination(R2) and root mean squares error(RMSE) between predicted and observed yield employing 10-fold cross-validation schemes. The R2 and RMSE of prediction are 0.8183 and 0.1807 for SVMR method, and 0.9999 and 0.0011 for PLS method, respectively. Comparison between the values of statistical parameters reveals the superiority of the PLSR model over SVMR one.展开更多
针对深部金属矿隧道掘进机(tunnelling boring machine,TBM)开拓岩爆微震监测与预警自动化、智能化不足的问题,开展了基于深度机器视觉DPED(drilling profile ellipse detection)-AT(accurate location of drilling multidimensional fe...针对深部金属矿隧道掘进机(tunnelling boring machine,TBM)开拓岩爆微震监测与预警自动化、智能化不足的问题,开展了基于深度机器视觉DPED(drilling profile ellipse detection)-AT(accurate location of drilling multidimensional features based on anchor tracking)方法的钻孔多维参数识别研究、微震传感器自动拆装装置研发与决策系统设计,实现了TBM开拓微震传感器自动拆装;研发了微震智能变频采集技术,实现了岩爆孕育过程岩石破裂信息连续、保真采集;研发了改进神经网络破裂信号识别与到时实时拾取算法,及岩爆孕育微震源概率场三维表征算法,初步实现TBM开拓岩爆孕育信息智能解译与精细化预警,最终建立了融合钻孔智能识别、传感器自动拆装、信号智能采集-解译的岩爆智能监测预警技术体系.招金矿业瑞海金矿应用表明,该技术初步实现了岩爆微震自动监测、解译与预警,为深部金属矿TBM开拓的少人化、无人化提供有力支撑.展开更多
Extremely hard and abrasive rocks pose great challenges to the past and ongoing TBM projects by increasing cutter wear and reducing penetration rates.A considerable amount of research has been conducted to improve the...Extremely hard and abrasive rocks pose great challenges to the past and ongoing TBM projects by increasing cutter wear and reducing penetration rates.A considerable amount of research has been conducted to improve the performance of TBMs in those challenging grounds by either improving the capacity of TBMs or developing assisting rock breakage methods.This paper first highlights the challenges of hard and abrasive rocks on TBM tunneling through case studies.It then presents the development of hard rock TBMs and reviews the technologies that can be used individually or as assistance to mechanical excavators to break hard rocks.Emphases are placed on technologies of high pressure waterjet,laser and microwave.The state of the art of field and laboratory research,problems and research directions of those technologies are discussed.The assisting methods are technically feasible;however,the main challenges of using those methods in the field are that the energy consumption can be over 10 times high and that the existing equipments have robustness problems.More research should be conducted to study the overall energy consumption using TBMs and the assisting methods.Pulsed waterjet,laser and microwave technologies should also be developed to make the assistance economically viable.展开更多
基金Project(2010CB732004)supported by the National Basic Research Program of ChinaProjects(50934006,41272304)supported by the National Natural Science Foundation of China
文摘Rate of penetration(ROP) of a tunnel boring machine(TBM) in a rock environment is generally a key parameter for the successful accomplishment of a tunneling project. The objectives of this work are to compare the accuracy of prediction models employing partial least squares(PLS) regression and support vector machine(SVM) regression technique for modeling the penetration rate of TBM. To develop the proposed models, the database that is composed of intact rock properties including uniaxial compressive strength(UCS), Brazilian tensile strength(BTS), and peak slope index(PSI), and also rock mass properties including distance between planes of weakness(DPW) and the alpha angle(α) are input as dependent variables and the measured ROP is chosen as an independent variable. Two hundred sets of data are collected from Queens Water Tunnel and Karaj-Tehran water transfer tunnel TBM project. The accuracy of the prediction models is measured by the coefficient of determination(R2) and root mean squares error(RMSE) between predicted and observed yield employing 10-fold cross-validation schemes. The R2 and RMSE of prediction are 0.8183 and 0.1807 for SVMR method, and 0.9999 and 0.0011 for PLS method, respectively. Comparison between the values of statistical parameters reveals the superiority of the PLSR model over SVMR one.
文摘针对深部金属矿隧道掘进机(tunnelling boring machine,TBM)开拓岩爆微震监测与预警自动化、智能化不足的问题,开展了基于深度机器视觉DPED(drilling profile ellipse detection)-AT(accurate location of drilling multidimensional features based on anchor tracking)方法的钻孔多维参数识别研究、微震传感器自动拆装装置研发与决策系统设计,实现了TBM开拓微震传感器自动拆装;研发了微震智能变频采集技术,实现了岩爆孕育过程岩石破裂信息连续、保真采集;研发了改进神经网络破裂信号识别与到时实时拾取算法,及岩爆孕育微震源概率场三维表征算法,初步实现TBM开拓岩爆孕育信息智能解译与精细化预警,最终建立了融合钻孔智能识别、传感器自动拆装、信号智能采集-解译的岩爆智能监测预警技术体系.招金矿业瑞海金矿应用表明,该技术初步实现了岩爆微震自动监测、解译与预警,为深部金属矿TBM开拓的少人化、无人化提供有力支撑.
基金Projects(3205009419,3205002001C3)supported by Fundamental Research Funds for Central Universities,China。
文摘Extremely hard and abrasive rocks pose great challenges to the past and ongoing TBM projects by increasing cutter wear and reducing penetration rates.A considerable amount of research has been conducted to improve the performance of TBMs in those challenging grounds by either improving the capacity of TBMs or developing assisting rock breakage methods.This paper first highlights the challenges of hard and abrasive rocks on TBM tunneling through case studies.It then presents the development of hard rock TBMs and reviews the technologies that can be used individually or as assistance to mechanical excavators to break hard rocks.Emphases are placed on technologies of high pressure waterjet,laser and microwave.The state of the art of field and laboratory research,problems and research directions of those technologies are discussed.The assisting methods are technically feasible;however,the main challenges of using those methods in the field are that the energy consumption can be over 10 times high and that the existing equipments have robustness problems.More research should be conducted to study the overall energy consumption using TBMs and the assisting methods.Pulsed waterjet,laser and microwave technologies should also be developed to make the assistance economically viable.
