Abstract
This paper introduces a case study on the failure mechanism and support design of a roadway tunnel in the fault fracture zone of the 106 mining area in the Yuandian no.2 coal mine. Based on the on-site geological conditions (in-situ stress test, borehole television imaging, and lithological analysis), the failure mechanism of the roadway tunnel in the fault fracture zone was studied. The test results showed that the high tectonic stress, fractured rock, and poor lithology are the primary reasons for the roadway instability. According to the support principles of grouting reinforcement, pre-reinforced support, and rational support range, a new type of combined support technology was proposed, including advanced grouting, grouting bolts, and grouting anchor cables. A 100 m roadway section was selected for field testing using the new support scheme, and detailed deformation monitoring was performed. Monitoring results showed that the roadway deformation under the new support was significantly reduced. During the roadway excavation process, no roof collapse phenomenon occurred, and the safety of roadway excavation was ensured. This successful case provides an important reference for similar roadway projects in the fault fracture zone.
Highlights
The stability of roadway surrounding rock has always been a key issue in underground engineering [1,2,3,4,5]
The results provide a reference for the support design of roadway engineering in similar geologic conditions
Grouting reinforcement: Field test results showed that broken surrounding rocks and poor lithology are the main causes of roadway damage
Summary
The stability of roadway surrounding rock has always been a key issue in underground engineering [1,2,3,4,5]. (2) U-steel support combined with grouting bolts and grouting anchor cables [28] This technology is the most commonly used support technology of roadway in the fault fracture zone, but it is not suitable for the fault fracture zone with poor geological conditions. Aiming at the fault fracture zone with poor geological conditions, a new roadway support technology should be proposed This contribution examines the 106 mining area of the Yuandian no. coal mine to study the instability mechanism and support design of an underground roadway through a fractured fault zone in tectonically deformed sedimentary rock. Considering the roof collapse soon after roadway excavation, a new type of combined support technology, including advance grouting, grouting bolts, and grouting anchor cables, was proposed based on the roadway failure mechanism. The results provide a reference for the support design of roadway engineering in similar geologic conditions
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