|
Hokkaido University Collection of Scholarly and Academic Papers >
Theses >
博士 （工学） >
Prediction of Rockburst at Mufulira Mine, Copperbelt, Zambia
|
Files in This Item:
|
|
|
Related Items in HUSCAP:
|
| Title: | Prediction of Rockburst at Mufulira Mine, Copperbelt, Zambia |
| Other Titles: | ザンビア共和国カッパーベルトに位置するムフリラ鉱山における山はねの予測 |
| Authors: | Sinkala, Pardon Browse this author |
| Issue Date: | 23-Mar-2023 |
| Publisher: | Hokkaido University |
| Abstract: | The overall aim of this study is to provide methods for prediction of rockburst in deep underground
mines, using Mufulira mine in Zambia's Copperbelt as a case study. For over 40 years, Mufulira
underground copper mine has been recording incidents of rockburst. Laboratory tests and numerical
analyses were carried out to understand the rockburst mechanism at the Mufulira mine. Rockburst did
not occur in the chain pillars or at the mining face, but mainly in the mining drives along diminishing
pillars or ahead of the mining face. RQD suggested that the rock mass in the rockburst areas was
relatively intact. Laboratory tests confirmed that the rock at Mufulira mine is very strong and brittle.
Elastic stress analyses for the rockburst sites by 3-D Displacement Discontinuity Method (DDM)
indicated very high stress in the chain pillars and low-stress concentration at the sites of rockburst
during the initial mining stages. However, there was no apparent positive correlation between the
elastically calculated normal stress values and the occurrences of rockbursts. The 2-D elastic FEM
analysis was conducted under the concentrated stress by DDM and indicated some stress increase
with face advance for the rockburst in the vicinity of the mining face. However, stress severity
indicated almost no increase, and the rockbursts cannot be explained as an instantaneous rock mass
failure due to stress increase by mining. Therefore, a creep damage model was proposed to clarify the
mechanism of the rockbursts. Cumulative rock damage was evaluated for the edge elements of each
sidewall of the mining drives, based on the normal stresses by 3-D DDM. The rockburst occurrences
were well hindcasted. Elastoplastic analysis could not successfully predict the M2.8 rockburst. A
method to estimate the volume of the rockburst source was proposed, and a likely result was obtained. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第15382号 |
| Degree Level: | 博士 |
| Degree Discipline: | 工学 |
| Examination Committee Members: | (主査) 特任教授 藤井 義明, 教授 川﨑 了, 教授 石川 達也, 准教授 児玉 淳一 |
| Degree Affiliation: | 工学院（環境循環システム専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/89746 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 工学院(Graduate School of Engineering)
学位論文 (Theses) > 博士 （工学）
|
|
