Abstract
Mine earthquake, as an underground disaster that occurs frequently, has a great impact on coal mine roadway and support. The stability analysis of the bolt support in roadway under different mine earthquake magnitudes is a key issue to be solved urgently in mining fields. This paper attempted to simulate the occurrence state of mine earthquake with explosive blasting process and verified it with actual coal mine microseismic monitoring data. ANSYS/LSDYNA software was used to analyze the impact of magnitude and location of mine earthquake hypocenter on the stability of bolt support and the dynamic stress characteristics of bolt. The results showed that with the increase in source energy of mine earthquake, the damage location of bolt mainly appears in the front of bolt and the loading position has no obvious change, but there is stress wave superposition effect, which deepens the damage of bolt. The bolts in the middle of the lane and the middle of the roof are greatly affected, so the support strength should be strengthened in these places. In addition, this paper compared the safety factor of bolt and the supporting effect of different schemes from three aspects such as roof subsidence, axial stress of bolt, and safety factor of bolt and then put forward a more economical and effective supporting scheme.
Highlights
In the process of coal mine production and construction, bolt support is often used to maintain the stability and integrity of surrounding rock and prevent deformation and failure of surrounding rock
Bolt support has the advantages of high efficiency and low cost, and it is widely used in coal mine industry
The dynamic load produced by stope disturbance, blasting, mine car, and so on will disturb the roadway surrounding rock and bolt bearing static load, resulting in the combined action of dynamic and static loads, which greatly affects the effect of bolt support. erefore, experts and scholars at home and abroad have done a lot of research on the influence of external dynamic load on roadway surrounding rock and bolt support
Summary
In the process of coal mine production and construction, bolt support is often used to maintain the stability and integrity of surrounding rock and prevent deformation and failure of surrounding rock. In the studies on the influence of dynamic load on surrounding rock and bolt support, the main research method adopted by most scholars at home and abroad is use external force to impact the model to generate impact load and use numerical simulation software to simulate the influence of dynamic loads such as explosion load and transverse load on roadway surrounding rock and bolt. This paper analyzed the relationship between explosive quantity and mine earthquake magnitude (energy), simulated and analyzed the static stress characteristics of bolts under different source energy, explored the changed law of dynamic axial stress of bolts, analyzed the influence of bolts spacing on bolt safety factor, and gave the best bolt spacing value in the support scheme
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