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| Surrounding rock stress distribution characterization via drilling friction resistance while rotary sounding#br# |
| LYU Xiangfeng,CAO Liting,MENG Lingfeng,LI Xinyue |
| (School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China) |
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Abstract The concentrated surrounding rock stress is the fundamental force source to induce coal-rock dynamic disasters. To improve the monitoring accuracy and efficiency of the drill-cutting method,a new method to characterize the surrounding rock stress distribution characterization via borehole ultimate friction resistance is proposed based on theoretical analysis and engineering test. Firstly,the plane stress damage equation of the surrounding rock stress and drill-cutting weight is deduced,and the validity of this equation is verified by existing numerical simulation,laboratory test and engineering test results. According to the plane stress damage equation,the influence of uniformly distributed surrounding rock stress,side pressure coefficient,Young?s modulus and damage factor on drill-cutting weight is analyzed. Secondly,according to the force characteristics of the drill bit,the relationship equation between the drilling parameters and borehole ultimate friction resistance is established. Finally,the engineering test was carried out through the self-developed intelligent drill-cutting system. Combined with the test results,the relationship model between the drilling parameters and drill-cutting weight is established (DP-N model),and the DP-N model is used to characterize the surrounding rock stress distribution characteristics of 12120 working face. The results show that:(1) The drill-cutting weight shows a linear positive correlation with the uniformly distributed surrounding rock stress and side pressure coefficient,an exponential function increasing relationship with the damage factor,and a power function decreasing relationship with the Young?s modulus. (2) The borehole ultimate friction resistance and drill-cutting weight have an obvious piecewise fitting characteristic. The drill-cutting weight on both sides of the piecewise point has the opposite characteristics with the borehole ultimate friction resistance,and is related to the dynamic changes of coal damage factor and Young?s modulus. (3) The characterization results of DP-N model are basically consistent with the characterization results of the measured drill-cutting weight,and the average deviation of DP-N model is 11.4%. The research conclusions can provide data support for monitoring and early warning of coal-rock dynamic disasters.
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