Rock drill impact structure coefficient
Analysis of Rock Friction Coefficient Characteristics Based
This paper investigates the frictional characteristics and anisotropy of rock by analyzing the coefficient of variation of the friction coefficient (f) and the anisotropy index of rock friction
ResearchontheMatchingofImpactPerformanceandCollision
tionship between the impact performance and the collision coefficient c is analysed. When c is in the range of 9–11, the impact piston''s design of a high-power rock drill can be satisfi d.
Impact performance optimization for hydraulic rock
In response to the issues of overheating of the shell and insufficient impact energy of the hydraulic rock drill, this paper focuses on the
Percussion characteristic analysis for hydraulic rock drill with
Abstract Considering the insufficiency of numerical study on the percussion characteristic of hydraulic rock drill, which restricts the improvement of efficiency and reliability,
Fault Diagnosis Research on Impact System of Hydraulic Rock Drill
The impact mechanism of the hydraulic rock drill is mainly composed of cylinder body, impact piston, reversing valve, and high pressure accumulator [7]. The impact piston and the
(PDF) Modern Methods and Tools for Determining
The authors in [15] correlated drilling variables and blast performance to the data analysis of different drilling parameters such as
Theoretical and numerical analysis of the rock breaking process
The rock breaking process by impact hammers can be divided into two sub-processes: the piston impact on the drill rod and the penetration into the rock. By applying
Experimental study on the mechanical behavior of high-stress
The formation of a pressure relief zone is crucial for rockbust prevention during drilling pressure relief. This study investigates the mechanical behavior of high-stress rock
Comparison of machine learning models for rock UCS prediction
To develop a method that can rapidly, efficiently, and economically estimate UCS across different rock types and engineering conditions based on while-drilling tests, this study
Research on the Penetration Coefficient During the Rock Drilling
In addition, the drilling processes of drill bits with different impact velocities, shapes, and angles are simulated to evaluate the effects of operational parameters on the
Impact performance optimization for hydraulic rock drill
Abstract In response to the issues of overheating of the shell and insufficient impact energy of the hydraulic rock drill, this paper focuses on the hydraulic rock drill with alternating front and rear
(PDF) Drillability Assessments in Hard Rock
Drillability is an important parameter in order to assess the influence that intact rock properties have on performance prediction and cost
Study on rock-breaking mechanism of impact trenching in
In the trench process of underground diaphragm walls, slurries play important roles in stabilizing the walls. Nevertheless, the slurry effect on rock breaking using impact drill bits
Rock Drilling
Abstract Rock drilling is widely used in various types of rock engineering. Rock boring is often used in tunneling, underground mining, and nuclear waste depository. This
Study on the optimization of blasting parameters and blastholes
This study focuses on the ore recovery blasting in fractured rock structures using the sublevel caving method. Through orthogonal experiments and range analysis, the factors of
Rock Drilling | SpringerLink
Drilling, in the field of rock excavation by drilling and blasting, even for excavation by non-blasting method, is the first and essential operation. The drilling mechanism, rock
Research on rock breaking mechanism of rotary-percussion drilling
In response, a theoretical model of the axial impact hammer motion mechanism under drilling fluid driving conditions was established, and the speed and frequency of
A sampling study on rock properties affecting drilling rate index
Many empirical tests have also been proposed to predict the drilling performance such as Point Load Strength, Schmidt Rebound Hardness, Shore Scleroscope Hardness,
Numerical investigation of rock-breaking mechanisms and
The results indicated that cutter penetration depth during rotary percussion drilling could be increased by 16.04% compared to that during conventional drilling. Under the same
(PDF) Modern Methods and Tools for Determining Drillability and
The authors in [15] correlated drilling variables and blast performance to the data analysis of different drilling parameters such as hardness coefficient, minimum SE drilling,
Wear Prediction of Rock Drill Bits Based on Geomechanical
The excavation of rock, whether in mining, petroleum, or civil engineering projects, predominantly relies on traditional drilling techniques. Across these applications, drilling bit
Research on the Matching of Impact Performance and
The relationship between the impact performance and the collision coefficient γ is analysed. When γ is in the range of 9-11, the impact piston''s
Practical-Rock-Engineering-Full-Text (1).pdf
The uncertainty associated with estimating the properties of in situ rock masses has a significant impact or the design of slopes and excavations in rock. The examples that have been explored
Research on the Matching of Impact Performance and
It n be seen from e e analysis that in e c rock drill, e s e with each other, suchas,shank,dlrod,inenof impact d e l n is r larger than e
Research on the Matching of Impact Performance and Collision
The stress wave produced by the piston impact, on the drill rod, is an important factor affecting impact performance. It is particularly important to control the stress waveform generated by
Impact System Dynamic Characteristics of Hydraulic Rock Drill
For the phenomenon of a hydraulic rock drill based on an underlapped reversing valve, the mechanical structure of the overlapped reversing form was proposed, which affected the
Research on the Matching of Impact Performance and Collision
The relationship between the impact performance and the collision coefficient γ is analysed. When γ is in the range of 9–11, the impact piston''s design of a high-power rock drill can be satisfied.
Impact System Dynamic Characteristics of Hydraulic
For the phenomenon of a hydraulic rock drill based on an underlapped reversing valve, the mechanical structure of the overlapped reversing form was
Experimental and numerical investigations on rock-breaking
To achieve high-efficiency drilling in hard formations, the rotary percussive drilling tool was designed to improve rock-breaking efficiency. Currently, few studies are conducted to
Numerical study of decoupling charge drilling and blasting under
The study also explored the influences exerted by lateral pressure coefficient (LPC), burial depth, and hole configuration on the propagation of rock cracks.
a Penetration depth vs. axial force of different rocks under...
Regarding operational parameters, the impact velocity has little effect on the penetration coefficient, while the shape and angle of the drill bit have a significant effect on the penetration
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