Abstract
Stability control for soft and broken surrounding rock of roadways is one important segment of mining support. Taking 1412 Roadway of a mine in Guizhou province as a research background, this paper studies the large deformation of surrounding rock and the failure of bolts and cables. The deformation and failure mechanism are analyzed by related theoretical analysis and field survey. Then, the feasibility of the composite controlling scheme, bolts and cables + grouting + steel tube concrete support, is verified by theoretical analysis, numerical simulation, and industrial test. Following results can be obtained: main reasons leading to the deformation of surrounding rock and the failure of cables and blots in the roadway are low strength and poor self-stability of surrounding rock, complex stress environment, low support resistance, and lack of reinforced support in crucial supporting sites; the control scheme can reduce the surrounding rock deformation by 40%, which meets the requirements of field application so that this practice can provide some guidance for other similar projects.
Highlights
Deformation and failure control of surrounding rock in soft rock roadway are always regarded as a difficult problem within worldwide underground engineering
Concrete-filled steel tube support has been applied on the field to control the deformation in soft rock roadway [7, 8]
Advances in Civil Engineering in China [13,14,15]. This technology has not been utilized to soft and broken swelling rock roadways influenced by high stress and strong disturbance
Summary
Deformation and failure control of surrounding rock in soft rock roadway are always regarded as a difficult problem within worldwide underground engineering. Advances in Civil Engineering in China [13,14,15] This technology has not been utilized to soft and broken swelling rock roadways influenced by high stress and strong disturbance. Based on the analysis of the surrounding rock deformation characteristics and mechanism, the composite supporting scheme, bolts and cables + grouting + steel tube concrete support, has been put forward and verified by the industrial test. This scheme can provide a reference for the surrounding rock control under similar conditions
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