The Influence of Confining Stresses on Rock Fragmentation, Thrust Force, and Penetration Energy in Sandstone Indentation Tests Using Disc Cutters

Author:

Wang Gaofeng12ORCID,Ren Ting3ORCID,Zhu Gaolei12ORCID

Affiliation:

1. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

3. Faculty of Engineering and Information Sciences, University of Wollongong, Wollongong, NSW 2522, Australia

Abstract

Hard rock Tunnel Boring Machines (TBMs) engaging disc cutters as cutting tools have been employed in considerable underground coal mines to accommodate the requirement of more stone drivage as operations are going deeper. This study conducted a set of disc cutter indentation tests to explore the influence of confining stresses on rock fragmentation, thrust force, and penetration energy on sandstone, which is commonly encountered in underground coal mines. The test results show that there exists a critical confining stress, under which the maximum thrust force and penetration energy keep increasing with confining stress mounting while the maximum thrust force and penetration energy will decrease or flatten if it is surpassed. By combining with previous studies and comparing the critical confining stress values to the rock mechanical properties’ values, the critical value is most likely to be of cohesion. For subsurface rock fragmentation, the Constant Cross Section (CCS) disc cutter indentation has denser cracks and their orientations are more lateral than those under the V shape one; the V shape disc cutter indentation is less sensitive to confining stresses, with no notable increase of crack number and crack reorientation with increasing confinement. Thus, the CCS disc cutter is more favorable than the V shape one from the perspective of rock fragmentation under confining stresses.

Funder

Fundamental Research Funds for the Central Universities

Publisher

Hindawi Limited

Subject

Civil and Structural Engineering

Reference32 articles.

1. Utilization of full face roadway boring machine in coal mines deeper than 1000 m and the key rock mechanics problems;Q.-S. Liu;Journal of China Coal Society,2012

2. Feasibility of application of TBM in construction of deep coal mine and its key scientific problems;Q.-S. Liu;Journal of Mining and Safety Engineering,2013

3. An introduction to geological aspects of methane occurrence and control in British deep coal mines

4. Drainage and utilization of Chinese coal mine methane with a coal–methane co-exploitation model: Analysis and projections

5. High performance longwall mining in deep and methane-rich coal deposits in Germany taking into account methods and technologies for controlling the calculated gas liberation;M. Bauer

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