Ground response to high horizontal stresses during longwall retreat and its implications for longwall headgate support
| Autor: | Peter Zhang, Essie Esterhuizen, D. F. Gearhart, Berk Tulu, Daniel Su, Mark Van Dyke |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
lcsh:TN1-997
High horizontal stress 0211 other engineering and technologies Energy Engineering and Power Technology Numerical modeling Longwall mining 02 engineering and technology Geotechnical Engineering and Engineering Geology Article Stress change Supplemental support 020401 chemical engineering Mining engineering Geochemistry and Petrology Longwall headgate 0204 chemical engineering Horizontal stress Roof lcsh:Mining engineering. Metallurgy Geology 021101 geological & geomatics engineering |
| Zdroj: | International journal of mining science and technology International Journal of Mining Science and Technology, Vol 29, Iss 1, Pp 27-33 (2019) |
| ISSN: | 2095-2686 |
| DOI: | 10.1016/j.ijmst.2018.11.020 |
| Popis: | Roof falls in longwall headgate can occur when weak roof and high horizontal stress are present. To prevent roof falls in the headgate under high horizontal stress, it is important to understand the ground response to high horizontal stress in the longwall headgate and the requirements for supplemental roof support. In this study, a longwall headgate under high horizontal stress was instrumented to monitor stress change in the pillars, deformations in the roof, and load in the cable bolts. The conditions in the headgate were monitored for about six months as the longwall face passed by the instrumented site. The roof behavior in the headgate near the face was carefully observed during longwall retreat. Numerical modeling was performed to correlate the modeling results with underground observation and instrumentation data and to quantify the effect of high horizontal stress on roof stability in the longwall headgate. This paper discusses roof support requirements in the longwall headgate under high horizontal stress in regard to the pattern of supplemental cable bolts and the critical locations where additional supplemental support is necessary. Keywords: Longwall mining, Longwall headgate, High horizontal stress, Supplemental support |
| Databáze: | OpenAIRE |
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