Abstract
In order to solve the problem that the roadway roof is large and easy to collapse under crushing conditions. Test shows that: Under the crushing condition, a considerable part of roadway surrounding rock deformation is in a given deformation state. The control effect of support resistance on surrounding rock deformation is limited at the level of existing technology. In this kind of roadway support, the deformation method of anchor cable high rigidity support should be abandoned. It is changed to adopt the long bolt with high elongation to adapt to the deformation of surrounding rock, and continue to provide high support resistance to prevent loose rock caving caused by roof collapse. Based on this, the supporting technology of replacing anchor cable with docking bolt is put forward to increase the coordination between supporting member and roadway surrounding rock deformation. The industrial test results of Baode coal mine show that the technology can adapt to the deformation of surrounding rock and effectively prevent the tunnel roof from caving due to the break of anchor cable.
Highlights
The main strategy for roadway support under such crushing conditions is to continuously strengthen the support strength, in an attempt to increase the rigidity of the roadway roof[1], but the results show that the control effect of this roadway is not ideal, a large number of anchor cable failure phenomenon still exists, roadway roof accidents occur from time to time[2]
In order to solve this problem, this paper proposes a practical new technology to replace the anchor cable with the butt bolt, that is, the butt bolt with a length of 5m is used to replace the anchor cables of various diameters in the roadway under the crushing condition that the roadway roof is sinking up to 300-1500mm
It makes the rigid anchoring of anchor cable to roof become the flexible anchoring of long bolt to roof, increases the coordination of deformation between supporting member and roadway surrounding rock, and achieves the purpose of basically eliminating the hidden danger of anchorage member breaking and roof caving
Summary
The main strategy for roadway support under such crushing conditions is to continuously strengthen the support strength, in an attempt to increase the rigidity of the roadway roof[1], but the results show that the control effect of this roadway is not ideal, a large number of anchor cable failure phenomenon still exists, roadway roof accidents occur from time to time[2]. In order to solve this problem, this paper proposes a practical new technology to replace the anchor cable with the butt bolt, that is, the butt bolt with a length of 5m is used to replace the anchor cables of various diameters in the roadway under the crushing condition that the roadway roof is sinking up to 300-1500mm It makes the rigid anchoring of anchor cable to roof become the flexible anchoring of long bolt to roof, increases the coordination of deformation between supporting member and roadway surrounding rock, and achieves the purpose of basically eliminating the hidden danger of anchorage member breaking and roof caving
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