The testing method of rock elastic modulus while drilling based on rotational ratio energy analysis

Abstract

The elastic modulus of rock mass is a fundamental parameter for the surrounding rock stability analysis and the support scheme design. The traditional testing methods are mainly conducted through indoor experiments, which require further research for in-situ testing of rock mass elastic modulus. This article conducts multi type rock mass digital drilling experiments based on the intelligent rotary cutting testing system for rock masses. The response law of drilling parameters to elastic modulus has been clarified. And a rock rotational ratio energy that integrates four types of drilling parameters is proposed. The rock elastic modulus prediction models (RD-Ei models) are established. The experimental results show that the average testing errors of the model based on drilling pressure, drilling torque, and rotational ratio energy are 21.04%, 18.84%, and 6.44%, respectively. On this basis, the intelligent drilling explore system of geology is used to carry out rock drilling experiments. The identification of rock interfaces and testing of elastic modulus can be achieved. This study lays a theoretical foundation for real-time quantitative measurement of the surrounding rock elastic modulus on site.

Keywords

rock mass cutting analysis / elastic modulus of rock mass / digital drilling / drilling parameters / in situ testing

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Central South University