Original scientific paper

https://doi.org/10.17559/TV-20180925164754

Pressure-Arching Characteristics of Fractured Strata Structure during Shallow Horizontal Coal Mining

Yanhai Zhao ; School of Civil Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China
Shuren Wang orcid.org/0000-0001-5490-2825 ; 1) International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China / 2) School of Mining Engineering, University
Youfeng Zou ; School of Surveying and Land Information Engineering, Henan Polytechnic University, 2001 Century Avenue, Jiaozuo, Henan Province, 454003, China
Xuchun Wang ; School of Civil Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao, Shandong Province, 266033, China
Bingqiang Huang ; Nanning Exploration & Survey Institute, 31-1 Chahuayuan Road, Nanning, Guangxi Province, 530022, China
Xingui Zhang ; College of Civil Engineering & Architecture, Guangxi University, 100 Daxue Road, Nanning, Guangxi Province, 530004, China

Abstract

It is an important problem for the alternated strong and weak roof weighting to threat the safety of working face during shallow coal mining and the total thickness breaking of the thin bedrock to cause the serious ground subsidence. To reveal the mechanism of the abnormal mining damage, the pressure-arching rule in overlying strata was studied. Based on the monitoring data of the typical shallow coal working face, the mechanical models of the symmetrical stress arch, the squeezed arch and the hinged structure of the fractured strata were established, and the difference of the load bearing capacity between the structures and the influencing factors was analysed by the deduced formula calculation. Then the evolution characteristics of the pressure-arch in the fractured strata were revealed by the numerical simulation analysis. The results show that the global pressure-arch of multilayer strata always exits in the surrounding rock and moves forward with continuous mining. The single pressure-arch and hinged structure are formed in each stratum under the global pressure-arch. The pressure-arch enables the fractured strata to carry load efficiently, and the instability of the pressure-arch can cause strong roof weighting and ground subsidence. These conclusions provide a theoretical reference for the stability control of the overlying strata structure under shallow coal mining.

Keywords

horizontal stress; pressure-arch; shallow coal mining; strata structure

Hrčak ID:

207447

URI

https://hrcak.srce.hr/207447

Publication date:

28.10.2018.

Visits: 1.718 *