Abstract
ABSTRACTUnder high horizontal ground stress, the squeezing failure has been a common failure pattern for deep roadway. And the large deformation of surrounding rock mass around the roadway has also been a major challenge for deep mining practices. This paper describes a case study of the failure mechanisms and stability control technology of deep roadway under high horizontal ground stress in Jinchuan mine in Gansu Province, China. And this paper also aims to propose a kind of support strategy to prevent the plastic slippage around the floor of roadway. This study started with an in situ broken zone measurement programme to determine the depth of broken zone at each part of the roadway. Combined with long bolt and floor beam, an improved support strategy has been proposed. The field test results show that the improved support strategy can successfully solve the problems of side wall collapse and floor heaven. It can significantly restricts rock mass large deformation and avoid frequent repair. Compare to the original support, the improved support strategy can greatly save investment of mines and also has good application value.
Highlights
With rapid economic developments, the global demand for mineral resources is increasing
This paper describes a case study of the failure mechanisms and stability control technology of deep roadway under high horizontal ground stress in Jinchuan mine in Gansu Province, China
Based on analysis and field experiments, this paper reports a case study on deep roadway stability at the Jinchuan mine in Gansu Province, China, where the roadways are suffering from severe floor heave and side wall collapse
Summary
The global demand for mineral resources is increasing. The deformation of rock masses becomes more and more serious (Vogel and Andrast 2000; Li 2010), especially for excavation activities under high in situ stress, where the failure associated with squeezing conditions often results in significant problems for roadway design and support. In one field experiment, Shen et al (2016) proposed a method to improve stress conditions and control the deformation of surrounding rock masses. Based on analysis and field experiments, this paper reports a case study on deep roadway stability at the Jinchuan mine in Gansu Province, China, where the roadways are suffering from severe floor heave and side wall collapse. The field test results show that the new support technology controls the surrounding rock convergence well and saves mining investment capital
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