Abstract
In this study, the analysis and control of stability of surrounding rock in deep fractured soft rock roadway located in the underground mine of Jinfeng gold mine in Guizhou Province, China, has been investigated. The surrounding rock of roadway has been analyzed to characterize its deformation and failure mechanism through field survey, testing of rock physical and mechanical properties, in situ stress measure, analysis of mineral components of rock, and investigation of rock fragmentation degree. Based on the numerical simulation technology, the influence of different factors on the stability of roadway is studied. The physical and mechanical properties of surrounding rock and the bearing capacity of surrounding rock layer are to be improved to maintain the stability of broken soft rock roadway as high ground stress, rock fragmentation, and poor lithology leading to tunnel instability. Hence, a high-strength “cable bolt + fiber-reinforced shotcrete + steel mesh + split sets + resin bolt + cement grouting” combined support system has been proposed to improve the effective bearing structure significantly with high integrity and bearing capacity.
Highlights
At present, the main mining countries have entered into the deep mining stage and initiated for developing deep roadway support which normally faces challenges in deep mining [1, 2]
It is difficult to ensure the stability of the deep broken soft rock roadway due to several influencing factors such as mining activities, rock mass physical and mechanical properties, and high-stress field, which directly cause difficulties in finding the stability control of surrounding rock [3,4,5,6,7,8,9,10,11]. e abundant scientific research achievements have been done by many researchers around the world to solve the ground support problem of deep soft surrounding rock roadway through developing new technology for deep soft rock roadway surrounding rock control, new theory, and performing the industrial test
Zhang Guangchao et al [13] investigated the stability control of surrounding rock in the deep fractured soft rock roadway by proposing a combined support system developed based on the high-strength bolt-intensive support, the new type of shotcrete structure protection, and the cement grouting reinforcement to characterize the deformation and failure characteristics and failure mechanism of the surrounding rock
Summary
The main mining countries have entered into the deep mining stage and initiated for developing deep roadway support which normally faces challenges in deep mining [1, 2]. Xie Heping confirms that the true characteristics of the typical “ ree High” occurrence environment and the additional attribute of “strong disturbance” and “strong aging” of resource exploitation of deep rock mass lead to frequent engineering disasters of high energy level and large volume in deep rock mass because of the applicability of traditional rock mechanics and mining theory in deep rock mass offers unclear mechanism, which is difficult to predict and control [18] It can be concluded from the literature that the development of an efficient constructive ground support system for support in deep fractured soft rock roadway still has the scope for research interest. The development of an efficient constructive ground support system for support in deep soft rock roadway in Guizhou’s Jinfeng underground gold mine is significant
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