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breaking ratio rock machine

Identifying Effective Rock-Breaking Ratio Based on Rock Chip

This study is aimed at defining a novel index (effective rock-breaking ratio, to identify the rock-breaking efficiency of TBM based on the rock chip information. To evaluate this approach, a series of field sieving and measuring tests of rock chips was P r is used to evaluate the rock-breaking efficiency of TBM based on the proportion of surface area of rock chips with particle size larger than 5 mm; (2) P r has a Identifying Effective Rock-Breaking Ratio Based on Rock Chip

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Research on the mechanism and performance of free

The effect of breaking depth on rock breakage performance was experimentally and numerically investigated under the conditions of tip width, inclined At present, the mechanized excavation of rock roadways is mainly based on point pick and disc cutter: point pick is difficult to cut the hard rock efficiently, and the The mechanism and performance of rock breakage by

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Experimental and simulation study on rock-breaking efficiency of

Given the fact many studies on rock-breaking efficiency of TBM's disc cutters are on homogeneous rocks, but rarely on composite rocks with significant The principle of rock breaking using a hydraulic splitter includes a rock-breaking method that transforms the axial hydraulic propelling force into a transverse Numerical and experimental investigation on rock

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A New Linear Cutting Experimental Machine for Disc-Cutter Rock

Aiming at the low rock-breaking efficiency of TBM disc cutters in tough rock environments, A new experimental machine combined with the high-pressure Abstract. For a tunnel boring machine (TBM), the cutter rock-breaking effect and mechanism are key components of the machine design and construction. TBM-cutter rock-breaking effect and mechanism

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The breaking work ratio of different rock samples. Download

Download scientific diagram The breaking work ratio of different rock samples. from publication: Drilling performance analysis of impregnated micro bit The cutting In underground projects such as mining and tunneling, the presence of coal rock columns plays a certain supporting role, and the instability of coal rock columns is often related to their size and shape of presence. Therefore, in order to investigate the compressive damage characteristics and damage evolution law of rocks of different Influence of Height–Diameter Ratio on Rock Compressive Failure

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Investigation of the Cross-Cutting Polycrystalline

The parallel track scraping principle of conventional PDC bits largely limits the cutting efficiency and working life in deep formations. Cross-cutting polycrystalline diamond compact (PDC) bit may be an High-efficiency rock breaking by hydraulic jetting is the key to radial horizontal You are accessing a machine-readable page. In order to be human-readable, please Liu, X.T. Optimum structure of a Laval n-nozzle for an abrasive air jet based on nozzle pressure ratio. Powder Technol. 2020, 364, 343–362Study on the Mechanism of High-Efficiency Rock Breaking by

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Rock Chip Properties of TBM Penetration in Jointed Rock

In most cases, TBM tunnels are constructed in jointed rock masses. Rock chip properties can be used to interpret the response of the rock mass to the TBM tunnelling. Engineering-scale simulations can help us to explain the relationship between rock chip properties and rock mass conditions. In this study, a GPU-based DICE2D P C Graham. Rock exploration for machine manufacturers. Exploration for Rock Engineering, 1976: 173-180. I W Farmer, N H Glossop. Mechanics of disc cutter penetration. Tunnels and Tunnelling, 1980, 12(6): 22-25. Google Scholar H M Hughes. The relative cuttability of coal-measures stone. Mining Science and Technology, 1986, 3(2): A New System to Evaluate Comprehensive Performance of Hard-Rock

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A Study of Optimal Rock-Cutting Conditions for Hard Rock TBM

The efficiency of TBM performance affected by the specific s/p (s: spacing and p: penetration) ratio of the disc cutter is a research issue in demand. This article presents a multi-indentation simulation using discrete element method (DEM) analysis to study the optimal rock-cutting phenomena in terms of the interaction of the s/p ratio with To improve the efficiency of tunnel boring machines (TBMs) in hard rock environment, the technology of pre-grooving-assisted disc cutters for rock breaking was studied. Firstly, considering the relative position of the pre-grooving and the disc cutter, the same trajectory (SM) and different trajectory (DM) pre-grooving-assisted rock-breaking Numerical simulation and experimental studies of rock-breaking

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New Method for Studying Rock-Breaking Mechanism by Disc Cutters

Gaining a thorough understanding of the theoretical principles of rock breaking with a disc cutter is a critical issue in tunnel boring machine (TBM) technology. To fully consider the complexity and importance of the basic principles of rock breaking during tunnel excavation, in this paper we use a new method, the smooth particle References (19) Research on combined rock-breaking mode of pre-cutting groove and TBM mechanical cutter. While studying the supracrustal Pechenga complex, we found Lower Proterozoic microfossilsNumerical study on rock breaking efficiency of TBM with the

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Investigating the cutting force of disc cutter in multi-cutter rotary

In this study, numerical simulations and similarity tests were conducted to achieve rock-breaking through continuous multi-cutter rotary cutting. The following conclusions were drawn based on the findings: (1) Compared with linear cutting, the cutterhead in multi-cutter rotary rock-breaking required a smaller thrust and greater torque.Full face rock tunnel boring machine in construction process, disc cutter put pressure on rock breaking, actually belongs to the process of energy transfer, from the point of view of energy analysis the energy transfer rules in the process of disc cutter rock breaking, based on CSM force prediction model, analysis disc cutter energy input and Research on Breaking Energy Mechanism of Tunnel Boring Machine

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Identifying Effective Rock-Breaking Ratio Based on Rock Chip

This study is aimed at defining a novel index (effective rock-breaking ratio, P r ) State Key Laboratory of Shield Machine and Boring Technology, Zhengzhou, Henan 450001, China. 2.PDF The cutter spacing relate to the rock breaking efficiency of the TBM. The double disc cutters rolling marble model is established by using ABAQUS Find, read and cite all the research(PDF) Simulation and Experimental Research on Disc Cutters

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Dynamic Rock-Breaking Process of TBM Disc Cutters and

The rock fragmentation and crack propagation of anisotropic rock induced by tunnel boring machine (TBM) tunneling is studied in this paper. First, a numerical model based on the 2D particle flowDeep rock formations in extreme environments are characterized by complex working conditions, various structures, high hardness, and high resistance to compression. However, existing coring techniques leave the cores of deep rock formations vulnerable to residual stresses, resulting in poor fidelity during deep coring. This paper Applied Sciences Free Full-Text Research on Fidelity MDPI

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Numerical Simulations and Experiments on Single-Tooth Rock-Breaking

The rock-breaking efficiency of a drilling tool directly affects the production costs and progress of foundation construction. It is essential to understand the mechanism of mechanical rock-breaking to improve rock-breaking efficiency. In this study, dynamic rock-breaking simulation research was carried out on a drill bit and was based on the PDF On Jan 12, 2023, Laikuang Lin and others published Comparison study on rock breaking characteristics of disc cutters under coupled static–dynamic loads and static loads Find, read and(PDF) Comparison study on rock breaking characteristics of disc

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Simulation of rock fragmentation induced by a tunnel boring machine

When the strain rates of rock material changed with certain range from 10 −5 to 10 1 s −1, there was little variation in the compressive strength. The strain rate of rock sample is in this range during the process of disk cutters breaking rock. So, the cutter forces changed with different strain rates are not simulated.To ensure the accuracy of the simulation results, we conducted parameter calibration to establish the relationship between macro- and meso-parameters of rocks (Nardin and Schrefler 2005).The mechanical parameters measured by indoor tests of rock masses, which we call macro-parameters, such as modulus of elasticity, uniaxial Simulation of Rock-Breaking Process by Drilling Machine and

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Machines Free Full-Text Research on the Mechanism and

In this paper, we propose an ultrasonically coupled mechanical rock-breaking technology, creatively design an ultrasonically coupled mechanical rock-breaking drum, concurrently develop an ultrasonic cracking simulation method based on test coordination, and study the cracking mechanism and characteristics of ultrasonically pre

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