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The Pore-forming Mechanism Study of Cam Bit on Percussive-Rotary Extruding DTH Drilling

Author: LuoChunHong
Tutor: ZhengZhiChuan
School: Jilin University
Course: Geological Engineering
Keywords: Impact extrusion rotary drilling Cam spinning drill bit Plastic flow of soil ABAQUS finite element analysis
CLC: P634.5
Type: Master's thesis
Year: 2009
Downloads: 119
Quote: 2
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Abstract


DTH hammer drilling technology in the soil strata extrusion construction has broad application prospects , it is a collection of percussion drilling , rotary drilling and air drilling in one, with high drilling efficiency , good quality into the hole , the drilling process not chip , both environmental pollution and energy utilization, higher number of advantages . DTH drilling extrusion is generally used in construction cone drill or ladder drills , when high confining pressure , the hard plastic formations implement drilling, drilling efficiency and significantly reduce , and sometimes not even footage . In response to these situations and learn soil rolling earth 's spin squeezing mechanism , the study design of the cam -type impact spinning drill bit. In this paper, contact nonlinear finite element theory , with the help of international ABAQUS finite element analysis software, to establish a squeeze of interaction between the bit and the soil -dimensional elastic-plastic finite element model to solve the drill bit in contact with the soil highly nonlinear problems . Cam spinning drill emphatically analyzed the stress-strain law and displacement variation ; simultaneously with the usual stress and strain cone drill and displacement were compared for the study of the role of soil under clear rotary impact mechanism provides the basis for the deformation . In order to verify the reliability of ABAQUS finite element simulations carried out outdoor drilling Test. The new drill - Cam spinning drill novel structure, drilling speed -oriented , able to effectively put the soil around the radial drill press , which effectively solve the drilling process produces \\

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Drilling Project > Drilling technology and methods
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