Results 51 to 60 of about 489 (102)

Effect of Soft–Hard Rock Composites on Rock Breaking Efficiency of TBM Disc Cutters in Deep Tunnels

Applied Sciences
Soft–hard composite strata are widely distributed in the surrounding rock of deep tunnels, which severely reduces TBM excavation efficiency. To elucidate the rock-breaking mechanism of TBM disc cutters in composite strata and to address unresolved issues related to cutter force evolution, a self-developed rotary cutting test platform was employed, and ...
Heng Sun, Weilong Tao, Chuang Jia, Fuquan Ji, Peishuai Chen, Xuewei Liu, Pengfei Liu, Xiaoxiang Peng, Bin Liu   +8 more
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Integrated selection and design method for PDC bits and positive displacement motor

Petroleum
It has been found that the rock breaking tools combination of positive displacement motors (PDM) with different output parameters (positive rotational speed and positive torque) and polycrystalline diamond compact (PDC) bits with different design ...
Zhaowei Wang, Xiangchao Shi, Ye Jiao, Shuai Chen, Rongrong Wang, Zonglin Lv   +5 more
doaj   +1 more source

Study on Rock Breaking Efficiency of Non Planar PDC Teeth

Academic Journal of Science and Technology
 In order to explore the law of rock breaking efficiency of existing non planar teeth in sandstone, indoor single tooth rock breaking experiment and numerical simulation of rock breaking are carried out for planar teeth, sharp circular teeth and axe teeth, and the effects of different eating depth and rake angle on rock breaking efficiency of PDC teeth
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Research Progress and Prospect on Laser Drilling Technology

Shiyou jixie, 2016
The conventional rotary drilling usually leads to drilling tool wear, which results in frequent drill bit replacement, causing long drilling period and high cost.The laser drilling technology could greatly improve the drilling speed and shorten the ...
Zhang Shiyi, Han Bin, Li Meiyan, Wang Yong, Sun Jianan   +4 more
doaj  

Experimental and numerical investigations on rotary rock-breaking force and efficiency of disc cutter

Rock and Soil Mechanics
Abstract Improving tunnelling efficiency and reducing cutter wear are challenging objectives when tunnelling in hard rocks, determining optimal cutting parameters is crucial for practical projects. Laboratory tests are essential for understanding the load performance of disc cutters.
Chi ZHANG, Long-chuan DENG, Qian-wei ZHUANG, Xiao-zhao LI, Qiu-ping WANG, Liang QIAO   +5 more
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Investigation on hard‐rock breaking performance and auxiliary mechanism of picks assisted with both‐sided high‐pressure water jets

Deep Underground Science and Engineering
Double‐wheel trench cutters display reduced efficiency while cutting through hard or extremely hard rock strata, leading to significant wear on their picks.
Jingjing Lu, Jiancheng Xiao, Hui Zhou, Xiao Ma, Congcong Hou, Jian Cui, Fujian Yang   +6 more
doaj   +1 more source

Study on Rock-Breaking Efficiency and Adaptability of Wedge Tooth Cutters in Complex Formations

Scientific Journal of Technology
In composite strata, the excavation efficiency of tunnel boring machines (TBMs) is significantly influenced by the morphology of stratigraphic interfaces. This study employs the Abaqus explicit dynamics module to establish an interaction model between wedge-toothed cutterheads and composite strata, investigating the matching relationship between ...
Hongbin Liu, Tao He, Jun Li, Hanjun Liu, Changwei Zhou   +4 more
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Numerical simulation of optimal jet angle of water jet assisted disc cutter rock breaking

Meitan kexue jishu
In order to solve the problems of difficulty in tunneling, serious tool loss and low efficiency of breaking ultra-high strength rock encountered in the construction process of traditional hob, high-pressure water jet has become a new method to improve ...
Anxin WANG, Yiqiang LU, Sheng ZHANG, Jianhong MA, Zhanbiao YANG, Hongyun FAN   +5 more
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New Tehniques of Pressure Relief and Permeability Enhancement by Abrasive Jet in Coal Mine Roadways

Shiyou jixie, 2023
Pure water jet penetration in hard coal seams is deficient for low rock-breaking efficiency and complex operation.This paper presents two new techniques of pressure relief and permeability enhancement by deep penetration with abrasive jet and by radial ...
Wang Bin, Huang Zhongwei, Yang Ruiyue, Li Xuechen, Li Jingbin, Chen Jianxiang, Qin Xiaozhou   +6 more
doaj  

A Study on the Effects of Hob Temperature on the Rock-Breaking Characteristics of Sandstone Strata

Applied Sciences
To explore the effect of hob temperature on the rock-breaking characteristics of full-section tunnel boring machines (TBMs) in sandstone strata, high-temperature furnace heating experiments of sandstone and physical and mechanical experiments at room ...
Yun-Gui Pan, You-Liang Chen, Xi Du, Hui-Dong Tong, Fei-Yu Tang, Xiao-Jian Wu, Su-Ran Wang, Shao-Ming Liao, Bin Peng   +8 more
doaj   +1 more source