Abstract
Deformation failure and support methods of roadways have always been critical issues in mining production and safety, especially for roadways buried in complex engineering geological conditions. To resolve these support issues of kilometer-depth roadways under high ground stress and broken rock mass, a case study on the roadways in the No. 2 mining area of Jinchuan Mine, China, is presented in this paper. Based on a detailed field survey, the deformation characteristics of the roadways and failure modes of supporting structures were investigated. It was found that the horizontal deformations were serious, and the primary support was not able to control the surrounding rock well. Additionally, a broken rock zone test was carried out, which indicated that a zonal disintegration phenomenon occurred around the roadways and the maximum depth of the fractured zone was more than 4.8 m. In order to effectively limit the deformation in the roadways, a new support scheme called the “multistage anchorage + concrete-filled steel tube” was put forward. To further assess the support behavior of the new method, we selected a test roadway in the research area, and numerical simulations and in-situ monitoring were conducted. The findings suggest that the roadway’s serious deformation under high ground stress and broken rock mass could be successfully controlled by the new control method, which can provide a reference for other engineering solutions under similar geological conditions.
Highlights
Due to fast economic growth, the status of mineral resources in the national economy and the need for mineral resources has been increasing
On the basis of the software’s structural unit, the support structures were simulated: the the beam unit was simulated for concrete-filled steel tube (CFST), the cable unit was simulated for the bolt and cable, and the beam unit was simulated for CFST, the cable unit was simulated for the bolt and cable, and the shell shell unit was simulated for the concrete spray layer
In order to highlight the effect of the new support scheme, a comparative test was carried out to simulate the deformation of a roadway roadway without without support
Summary
Due to fast economic growth, the status of mineral resources in the national economy and the need for mineral resources has been increasing. Traditional supporting methods, such as the use of spray-bolt-mesh, can no longer effectively control the large deformation of roadways under high geo-stress and broken rock mass. Researchers are paying more attention to the development of new materials and combined support schemes He et al [13] and Sun et al [14] developed bolts with a constant resistance; Li et al [15] found a high-strength cable; Srivastava and Singh [16] developed a grouted bolt; and Gao et al [17], Li et al [18] and Zhang et al [19] proposed round, square, and D-shaped concrete-filled steel tubes. The Jinchuan nickel mine in China was selected as the research area in this study and a detailed field investigation into the deformation and support of deep roadways under broken rock mass was performed. On-site experiments, field monitoring and economic analyses were performed to assess the new support scheme’s control effect
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