·In order to improve the rock breaking efficiency of hard rock tunnel boring many innovative rock breaking methods have been proposed the water jet cutting the high power laser cutting the impact rotary drilling and the undercutting method However most of the methods are not applicable to TBMs due to some structural reasons Aiming
·Low rock breaking efficiency has been a bottleneck problem for current TBMs Therefore it is very necessary to investigate high efficiency rock breaking technology In fact rock boring organisms exist in nature which achieve drilling and/or tunnelling in rocks through a tribochemical interaction This phenomenon is called bioerosion and the
·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
·As one of the main facilities for the construction of underground space engineering the Tunnel Boring Machine TBM is widely used in tunnel excavation because of its higher efficiency better safety and more economical than traditional mining methods [1 2] However the tunneling efficiency and reliability are greatly affected by the TBM
·the tunnel face by using a rotating cutter head and breaking the rock between the tracks into chips Another prominent development of TBMs occurred in the 1950s when Robbins introduced the disc cutter [3 4] Since then the fundamental machine design and rock breaking process have remained the same The rock breaking process
This study investigates the factors affecting the rock breaking efficiency of the TBM disc cutter in deep rock excavation including confining pressure penetration cutter spacing and revolution speed The finite element method is employed to formulate a rock breaking model of the rotary disc cutters and a numerical simulation is also implemented The rock
the rock could be extracted satisfactorily and in geometries of low confinement this could be accomplished with high efficiency In concrete breaking no problems were encountered in breaking the concrete itself but if present in a three dimensional array the reinforcing bars could cause trouble Tests with the largest machine confirmed its
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 rock cutting
Rilon has been focusing on the development and innovation of non explosive rock breaking systems and is an expert in the field of non explosive blasting rock breaking technology Our main products are piston rock splitters CO2 rock breaking equipment Integrated hydraulic rock drills and splitters large rock splitters hand held hydraulic
·Aiming at the low rock breaking efficiency of TBM disc cutters in tough rock environments A new experimental machine combined with the high pressure water jet rock breaking method was designed It can flexibly change the cutting parameters of the water jet such as spray position spray height pressure etc Moreover the three direction load of
4 ·HB 3600 rock breaking and demolition foundation Epiroc with his HB 3600 hydraulic breaker Our Heavy Breakers are highly adapted for primary blast free rock excavation and secondary rock breaking on construction sites and in quarries surface and underground mines as well as primary demolition of massive reinforced concrete structures
·In Fig 5 rock breaking with disc hob under three forces Xia et al 2012 the vertical force F n caused by jack thrust of shield machine; the rolling force F r tangent to hob circle caused by cutterhead rotation of shield machine; the lateral force F s is composed of the rotary centrifugal force of the cutterhead and the shearing force of rock
·Tunnel boring machines TBMs have been increasingly applied in extreme regions such as "Three highs" high confining pressure high rock hardness and high quartz content researchers have introduced laser technology to the TBM field to improve cutting efficiency The aim of this study is to investigate the effect of laser power laser moving
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·Research on rock breaking primarily focuses on mechanical properties of the hob breaking rock and its prediction model under complex geological conditions [7] such as cutter wear confining pressure and hard rock This study introduces a construction scheme for shaft in broken rock masses with a large raise boring machine in an
·For a tunnel boring machine TBM the cutter rock breaking effect and mechanism are key components of the machine design and construction Each cutter on the TBM cutterhead is affected by adjacent cutters and exhibits different rock breaking effects under different rock breaking sequences Considering the influence of two adjacent
·The rock samples named gneiss are used in these cutting tests which are widely encountered by TBM hob To fit the workbench of the TBM linear cutting platform the rock samples are cut into cuboids with the dimensions of 900 × 400 × 300 mm surfaces of the rock samples are polished by grinding wheel to eliminate the influence
·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 In the indoor cutter rock breaking test the most intuitive discovery was that the disc cutters broke the rock block to produce various forms of
·In Fig 5 rock breaking with disc hob under three forces Xia et al 2012 the vertical force F n caused by jack thrust of shield machine; the rolling force F r tangent to hob circle caused by cutterhead rotation of shield machine; the lateral force F s is composed of the rotary centrifugal force of the cutterhead and the shearing force of rock
·To study the extendibility of the proposed approach another objective is added Considering the TBM tunneling process will consume a large amount of energy including the energy used for breaking rock supporting hydraulic cylinders propelling the machine and slagging out the rubbles Energy consumption EC is considered another
·A tool system is highly important for hard rock tunnel boring machines TBMs and disc cutter performance is directly related to the engineering efficiency and reliability of TBMs the
The disc hob is a key component of the roadheader and its stress is complicated during the rock breaking process In this paper the finite element simulation analysis is carried out based on the external and internal actual force conditions of the disc hob The research shows the rock breaking force of the hob is changing at any time Through the thermal
Furthermore a linear cutting test machine or rotary cutting test machine was used to conduct the rock breaking process using WTBM However the rock sample size had a significant impact on the test results Therefore the size of the rock sample must be closer to the actual tunnel size to eliminate any size dimensional effect
·The optimal rock breaking performance was obtained when the tip width was approximately 1 mm Compared with the traditional rock breaking method the preslotting method can significantly reduce the cutter load Tunnel boring machines TBMs are representative methods of rock breakage by mechanized cutting tools that depend on
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