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 …

Cutter spacing is one of the important mechanical parameters that influence the cutting efficiency of tunnel boring machines (TBMs). A methodology was developed …

With the gradual increase in drilling and mining depth in geothermal, oil, and other fossil energy explorations, complex geological environments (especially hard strata) have forced researchers to develop high-efficiency rock-breaking techniques. Inspired by the dynamic impact theory and the particle jet technique, an ultrasonic vibration field …

A slight improvement in the rock breaking efficiency and material ratio will bring considerable economic benefits. In practical engineering applications, selecting …

The full-section rock tunnel boring machine (TBM) has excellent advantages in engineering cost, construction period, and construction safety, so it is more and more widely used in tunnelling. However, the TBM tunnelling efficiency is greatly affected by the geological conditions.1, 2, 3 Therefore, it is crucial to study the rock-breaking efficiency …

The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking efficiency of TBM. This study is aimed at defining a novel index (effective rock-breaking ratio, Pr) to …

During tunnel boring machine (TBM) construction, the rock breaking effect of the disc cutter in complex formations affects the progress and cost of the entire project. Therefore, it is necessary to better understand the rock breaking mechanism of TBM in complex formations. In this study, matrix discrete element method (MatDEM) software is …

Comparison of the specific energies of sinusoidal VCS cutter rings and CCS cutter rings in breaking rock-like materials based on the FEM

Rotary percussive drilling technology can solve the problems of low efficiency and high cost in deep hard formation drilling effectively; it can improve drilling efficiency and reduce stick-slip vibration in order to improve transmission efficiency of WOB (weight of bit). However, the rock breaking and ROP rising (rate of penetration) …

2 ROCK BREAKING SIMULATIO N OF TBM CUTTER. In order to study the influence of pre-cutting groove on the rock breaking efficiency of. TBM, Distinct Lattice Spring Model has been used to conduct ...

The mechanical specific energy (MSE) and the ratio of brittle energy consumption to total energy are negatively correlated; rock-breaking efficiency is …

Cutterhead loads are the key mechanical parameters for the strength design of the full face hard rock tunnel boring machine (TBM). Due to the brittle rock-breaking mechanism, the excavation loads acting on cutters fluctuate strongly and show some randomness. The conventional method that using combinations of some special static …

From the comprehensive consideration of the average propulsive force and the rock breaking specific energy consumption, when the rotating speed of the disc …

Mechanical characteristics of a tunnel boring machine cutterhead during rock breaking: Physical model tests and transient dynamic analysis

From the comprehensive consideration of the average propulsive force and the rock breaking specific energy consumption, when the rotating speed of the disc cutter takes a larger value, the rock ...

Rock drilling machine is an indispensable device in the excavation of tunnels by drilling and blasting method. The drill bit of drilling machine penetrates the rock body at a high speed and applies an impact load on it, increasing the range of broken rock body below the impact area and promoting the rock breaking.

Taking measured data as the driving parameter, the real-time mechanical characteristics of the cutterhead were determined through transient dynamic analysis. Numerical simulation results showed that the vibration trend during excavation was the superposition of random vibrations generated by rock breaking and tunneling without …

The influence of impact parameters on the rock-breaking performance and cutting temperature was analyzed. The results proved that the compound impact load changes the rock failure mode and improves the rock-breaking efficiency.

The rock chip information can directly reflect the "rock-machine" interaction mechanism, identify the quality of surrounding rock and the geology in TBM construction, and indirectly reflect the ...

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 rock mass energy …

This study is aimed at defining a novel index (effective rock-breaking ratio, P r ) to identify the rock-breaking efficiency of TBM based on the rock chip information.

Rock tunnel boring machines (TBMs) are suitable for the construction of large mountain tunnels as it has the advantages of one-time excavation of tunnel section, high excavation efficiency and small disturbance to surrounding environment [ 1 ]. Rock breaking by disc cutters is the key problem for TBM excavation, and the rock-breaking …

Theoretical and numerical studies of rock breaking mechanism by double disc cutters. A plane mechanical model of rock breaking process by double disc cutter at …

The results show that the slotting treatment is of great significance for reducing the rock-breaking force and improving the rock-breaking efficiency of TBM mechanical disc cutter, and the ...

breaking ratio rock machine. Inicio > breaking ratio rock machine. Rate Analysis of Excavation in Earthwork •Rate analysis of excavation in earthwork use of IS Code 1200 part 1, Part 27, IS 4988, IS 12138 (Part IV) and CPWD for calculation is this measurement of the quantity of excavation to be carried out, the cost of labour, machinery, and ...

The rock-breaking process of cutter wedge cracking was analyzed by combining the characteristics of thrust load and the ratio of tensile damage. The effects of the slotting feature and tool geometric parameters on …

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 ...

Request PDF | Tunnel Boring Machine (TBM) Cutter Spacing Design Based on Simulations of Rock Breaking Process Using a FEM-SPH Coupling Method | For the finite element method (FEM) simulation of ...

There are many studies on rock-breaking efficiency of TBM's disc cutters on homogeneous rocks; however, there are few studies on the cutter's rock-breaking efficiency on composite rocks. Specifically, research on the breaking efficiency of cutters on composite rocks with substantial differences in strength and composite ratios has not …

The rock chip information (shape, size, and particle size distribution) could comprehensively reflect the characteristics of rock mass and rock-breaking e ciency of …