Anelastic strain recovery in situ stress measurement method and its application prospect in underground mines

Abstract

Current stress state data are important in underground mine construction, analysis the of tunnel stability, the forecasting of coal and gas rock bursts in underground mines. At present, the hollow inclusion gauge is primarily used for in situ stress measurement in underground mines. However, the sensors of these gauges often fail to fully adhere to the borehole wall, which can reduce the reliability of the measurement results. In this study, the anelastic strain recovery (ASR) in situ stress measurement method based on oriented cores is introduced. The effectiveness of this technique is analyzed by comparing the test results with those obtained by the hydraulic fracturing method. In addition, the reliability of the ASR method is evaluated by repeatability testing. The ASR results indicate a horizontal minimum principal stress error of less than 10% compared with those obtained by the hydraulic fracturing method. The repeatability test results show good consistency in the in situ stress measurement results of two back-to-back test samples. The ASR method is a safe and highly efficient technique that is not limited by the depth and measurement environment. Therefore, it is expected to have broad application for underground mine in situ stress measurement.

Study on In Situ Stress Distribution Law of the Deep Mine: Taking Linyi Mining Area as an Example

“…With the increase of seepage flow, the floor water inrush takes place. Many scholars and engineers in China and abroad devote their time to investigate the relationship between rock mass stress and permeability [49][50][51][52][53], which is only confined to indoor study. No progress has been made in the field research on the law of rock mass stress and permeability, and there is a lack of research on the original rock stress and floor failure depth.…”

In situ stress measurement method of deep borehole based on multi-array ultrasonic scanning technology

“…In situ stress is an important basic data for the stability design of mining, power station, tunnel and other projects, and it is also one of the most important factors to consider in the excavation design and stability analysis of underground space. Therefore, in situ stress parameters have become very important in the excavation of deep underground projects (Bai et al, 2018;Ji 2009;Sun et al, 2020;Wang and Wang 2017).…”