Results 261 to 270 of about 1,504,519 (328)

Experimental study on rock-breaking characteristics of advanced premixed abrasive water jet

Zhongguó gongchéng xuékan
To investigate the rock-breaking characteristics of the advanced premixed abrasive water jet, experiments of abrasive water jet eroding granite were carried out.
Jian-ping Wei, Yang Du, Yong Liu, Lizhen Zhao, Mengyuan Wang, Dongxin Zhang, Leilei Si, Hongtu Zhang   +7 more
semanticscholar   +1 more source

Why Do Freezing Rocks Break?

Science, 2006
Contrary to common perception, the breaking of rocks is usually not caused by the expansion of water upon freezing.
openaire   +1 more source

Rock-Breaking Characteristics of Three-Ribbed Ridge Nonplanar Polycrystalline Diamond Compact Cutter and Its Application in Plastic Formations

SPE Journal
To improve the penetration performance of polycrystalline diamond compact (PDC) bits in hard-to-penetrate plastic formations, the study of three-ribbed ridge nonplanar PDC cutter technology was carried out.
Lian Chen, Xiaoqiang Peng, Yong Li, Xindong Wang, Song Wang, Hua Luo, Qingchun Gao, Xiyang Song   +7 more
semanticscholar   +1 more source

High-prequency electrothermal rock breaking

Soviet Mining Science, 1968
1. Rocks of the second and fourth groups [above] are those most favorable for high-frequency electrothermal breakage. 2. To break rocks of the third group, it is necessary to build a plant with parameters enabling the generator to be matched with the load. 3.
openaire   +1 more source

Experimental and numerical simulation research on shock wave rock-breaking by high voltage electric pulse

Physica Scripta
High-voltage electric pulse(HVEP) drilling technology has the advantages of high rock-breaking efficiency, green and non-polluting. Aiming at the importance of HVEP drilling technology in generating plasma channels, plasma shock waves, and rock-breaking ...
Weiji Liu, Xin Zhou, Xiaohua Zhu
semanticscholar   +1 more source

Study on Composite Rock-Breaking Mechanism of Ultrahigh-Pressure Water Jet–PDC Cutter

SPE Journal
The drilling industry is paying increasing attention to deep and ultradeep wells because of the gradual decline and depletion of recoverable resources on the shallow surface.
Can Cai, Wenyang Cao, Xianpeng Yang, Pei Zhang, Lang Zeng, Shengwen Zhou   +5 more
semanticscholar   +1 more source

Investigation of combined rock-breaking ability of sawblade and conical pick

Measurement science and technology
To solve the problem of severe wear and low rock-breaking efficiency of a conical pick during rock cutting, a method of rock-breaking using a sawblade and conical pick is proposed, which can improve the rock-breaking ability and efficiency.
Zhiwen Wang, Qingliang Zeng, L. Wan, Zhenguo Lu, Zhihai Liu   +4 more
semanticscholar   +1 more source

Energy of rock breaking in percussive drilling

Soviet Mining Science, 1980
1. The volumetric rate of widening boreholes with the aid of pneumopercussive reamers is 2.5–4.0 times greater than the volumetric rate of drilling by the series-produced M48, MP-3, and M32K pneumatic drills; this is due both to the higher power of the reamers and to the different rock-fracture conditions (shape of face, geometry of bit ...
N. A. Belyaev, N. N. Esin
openaire   +1 more source

The three-dimension model for the rock-breaking mechanism of disc cutter and analysis of rock-breaking forces

Acta Mechanica Sinica, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhang, Zhao-Huang, Sun, Fei
openaire   +1 more source

An investigation into rock breaking by direct impact

Mining Science and Technology, 1987
Abstract An empirical approach towards analysis of rock breaking under direct impact and laboratory conditions is suggested utilizing limestone and concrete blocks. Characteristics and mechanism of rupture in the test blocks are discussed. It is found that the effect of reflected shock waves is less significant than that of the stress relief in ...
A. Afrouz, F.P. Hassani
openaire   +1 more source