Research progress on rotary cutting drilling testing method for rock mechanics parameters

WANG Qi; GAO Hongke; FENG Fan

Abstract：The accurate acquisition of rock mass mechanical parameters is the prerequisite for the stability analysis and support design of mine roadways surrounding rock.The traditional laboratory testing method for rock sample from sur-rounding rock is difficult to meet the timeliness requirement of obtaining rock mass mechanical parameters in deep min-ing and intelligent development of coal mines.The digital drilling test technology is a method to analyze the mechanical parameters of rock mass by using the real-time drilling parameters such as drilling rate,rotational speed,drilling pressure,and drilling torque.This method provides a new way to obtain the mechanical parameters of surrounding rock of roadway in situ.The key is to establish the quantitative relationship between the drilling parameters and the rock mass mechanical parameters,and to develop intelligent drilling equipment matching with the drilling theory.The author's team designed and developed a digital analysis drill bit,obtained the theoretical solutions of rock mass cutting strength and cutting energy based on rotary cutting drilling parameters,and established the inversion model of rock mass compressive strength and elastic modulus while drilling.A true triaxial rock digital drilling test system(TRD system)and a high precision rock in-telligent rotary cutting test system(RCT system)have been developed,and a series of digital drilling tests have been car-ried out.On this basis,the intelligent drilling explore system of geology(IDE system)is developed,and the in-situ detec-tion method of mechanical parameters of roadway surrounding rock while drilling is established.The research results provide theoretical and technical support for in-situ real-time intelligent perception of roadways surrounding rock.