With rampant growth and improvements in drilling technology,drilling of blast holes should no longer be viewed as an arduous sub-process in any mining or excavation process.Instead,it must be viewed as an important op...With rampant growth and improvements in drilling technology,drilling of blast holes should no longer be viewed as an arduous sub-process in any mining or excavation process.Instead,it must be viewed as an important opportunity to quickly and accurately measure the geo-mechanical features of the rock mass on-site,much in advance of the downstream operations.It is well established that even the slightest variation in lithology,ground conditions,blast designs vis-à-vis geologic features and explosives performance,results in drastic changes in fragmentation results.Keeping in mind the importance of state-of-the-art measurement-while-drilling(MWD) technique,the current paper focuses on integrating this technique with the blasting operation in order to enhance the blasting designs and results.The paper presents a preliminary understanding of various blasting models,blastability and other related concepts,to review the state-of-the-art advancements and researches done in this area.In light of this,the paper highlights the future needs and implications on drill monitoring systems for improved information to enhance the blasting results.展开更多
Based on analyzing method of large diameter hard rock drilling at home and abroad, the authors proposed a set of drilling of large diameter hard rock annular coring in low energy consumption, low cost and high efficie...Based on analyzing method of large diameter hard rock drilling at home and abroad, the authors proposed a set of drilling of large diameter hard rock annular coring in low energy consumption, low cost and high efficiency. The prototype of drilling tools was designed and was made. The experimental result of the prototype indicates that this plan and technology are feasible and reach the anticipated object of design. A set of drilling tools has been offered for the constructs of large diameter hard rock coring.展开更多
Rational rock-explosive matching is of great importance to enhancing explosive energy effective utilization and improving rock fragmentation effect.The traditionally emphasized method of acoustic impedance matching is...Rational rock-explosive matching is of great importance to enhancing explosive energy effective utilization and improving rock fragmentation effect.The traditionally emphasized method of acoustic impedance matching is not rational.Based on blasting breakage mechanism,a new theory of rock-explosive matching in drilling and blasting is proposed.The new approach chooses explosive parameters by reasonable control of the size of crushed zone under the condition of fully fragmentation between adjacent blast holes.This method can directly reflect the blasting fragmentation effect and energy effective utilization,which is easy to implement.Also,a modified model is developed,taken adjacent blast hole blasting loading into account.As a result,explosive parameters of different grades of rock are given in full coupling on-site mixed explosive charge for different project objectives.展开更多
Classification of surrounding rock is the cornerstone of tunnel design and construction.The traditional methods are mainly qualitative and manual and require extensive professional knowledge and engineering experience...Classification of surrounding rock is the cornerstone of tunnel design and construction.The traditional methods are mainly qualitative and manual and require extensive professional knowledge and engineering experience.To minimize the effect of the empirical judgment on the accuracy of surrounding rock classification,it is necessary to reduce human participation.An intelligent classification technique based on information technology and artificial intelligence could overcome these issues.In this regard,using 299 groups of drilling parameters collected automatically using intelligent drill jumbos in tunnels for the Zhengzhou-Wanzhou high-speed railway in China,an intelligent-classification surrounding-rock database is constructed in this study.Based on a machine learning algorithm,an intelligent classification model is then developed,which has an overall accuracy of 91.9%.Finally,using the core of the model,the intelligent classification system for the surrounding rock of drilled and blasted tunnels is integrated,and the system is carried by intelligent jumbos to perform automatic recording and transmission of drilling parameters and intelligent classification of the surrounding rock.This approach provides a foundation for the dynamic design and construction(both conventional and intelligent)of tunnels.展开更多
文摘With rampant growth and improvements in drilling technology,drilling of blast holes should no longer be viewed as an arduous sub-process in any mining or excavation process.Instead,it must be viewed as an important opportunity to quickly and accurately measure the geo-mechanical features of the rock mass on-site,much in advance of the downstream operations.It is well established that even the slightest variation in lithology,ground conditions,blast designs vis-à-vis geologic features and explosives performance,results in drastic changes in fragmentation results.Keeping in mind the importance of state-of-the-art measurement-while-drilling(MWD) technique,the current paper focuses on integrating this technique with the blasting operation in order to enhance the blasting designs and results.The paper presents a preliminary understanding of various blasting models,blastability and other related concepts,to review the state-of-the-art advancements and researches done in this area.In light of this,the paper highlights the future needs and implications on drill monitoring systems for improved information to enhance the blasting results.
文摘Based on analyzing method of large diameter hard rock drilling at home and abroad, the authors proposed a set of drilling of large diameter hard rock annular coring in low energy consumption, low cost and high efficiency. The prototype of drilling tools was designed and was made. The experimental result of the prototype indicates that this plan and technology are feasible and reach the anticipated object of design. A set of drilling tools has been offered for the constructs of large diameter hard rock coring.
基金Foundation items： National Science Fund for Distinguished Young Scholars, China （No. 51125037） Natio- nal Basic Research Program of China （No. 2011CB013501） National Natural Science Foundation of China （No. 51279135）
文摘Rational rock-explosive matching is of great importance to enhancing explosive energy effective utilization and improving rock fragmentation effect.The traditionally emphasized method of acoustic impedance matching is not rational.Based on blasting breakage mechanism,a new theory of rock-explosive matching in drilling and blasting is proposed.The new approach chooses explosive parameters by reasonable control of the size of crushed zone under the condition of fully fragmentation between adjacent blast holes.This method can directly reflect the blasting fragmentation effect and energy effective utilization,which is easy to implement.Also,a modified model is developed,taken adjacent blast hole blasting loading into account.As a result,explosive parameters of different grades of rock are given in full coupling on-site mixed explosive charge for different project objectives.
基金supported by the National Natural Science Foundation of China(NSFC)[Grant Nos.51578458,and 51878568]the China Railway Corporation Science and Technology Research and Development Program[Grant Nos.2017G007-H,2017G007-F,P2018G007,K2018G014,and K2018G014-01].
文摘Classification of surrounding rock is the cornerstone of tunnel design and construction.The traditional methods are mainly qualitative and manual and require extensive professional knowledge and engineering experience.To minimize the effect of the empirical judgment on the accuracy of surrounding rock classification,it is necessary to reduce human participation.An intelligent classification technique based on information technology and artificial intelligence could overcome these issues.In this regard,using 299 groups of drilling parameters collected automatically using intelligent drill jumbos in tunnels for the Zhengzhou-Wanzhou high-speed railway in China,an intelligent-classification surrounding-rock database is constructed in this study.Based on a machine learning algorithm,an intelligent classification model is then developed,which has an overall accuracy of 91.9%.Finally,using the core of the model,the intelligent classification system for the surrounding rock of drilled and blasted tunnels is integrated,and the system is carried by intelligent jumbos to perform automatic recording and transmission of drilling parameters and intelligent classification of the surrounding rock.This approach provides a foundation for the dynamic design and construction(both conventional and intelligent)of tunnels.
