English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The distribution characteristics of in-situ stress have significant influences on the stability of the surrounding rock masses in deep mine roadways. However, the derivation of a complete calculation formula for the principal stresses by the hollow-inclusion strain gauge (HISG) method and the quantitative application of in-situ stress measurement in the design of roadway support systems in deep mines have been rarely undertaken. Thus, in this study, an HISG method is used to measure the in-situ stress, investigate the in-situ stress state in deep mines, and improve the stability control of roadway surrounding rock masses. A calculation formula for the principal stresses was derived by the HISG method, using a coordinate transformation method. The derivation was based on the elastic deformation hypothesis of a homogeneous isotropic rock, and the deformation analysis theory of a circular hole within the framework of elasticity mechanics. Four deep mines in the Xinji coalfield (Anhui Province, China) were selected to measure the in-situ stress and analyze the magnitudes, orientations, and dips of the principal stresses. The depths of these points ranged from 605 m to 985.5 m. The distribution characteristics of the in-situ stress in the coalfield were studied. A finite-element numerical model was established for the optimization of the technical parameters of the support system of the roadway named “central air return rise” in the Kouzidong coal mine. The results showed that the stress characteristics directly affect the stability of the surrounding rock mass. Particularly, the roadway surrounding rock mass could be severely damaged when the coefficient of the non-uniform horizontal stress is higher than 1.8, the tectonic stress coefficient exceeds 1.4, and the angle between the roadway strike and the maximum principal stress is larger than 75°. This study can provide a reference for in-situ stress measurement, stability analysis, and roadway support design for deep mines.

In - situ Stress Measurement and its Engineering Application in Deep Coal Mines: A Case Study in the Xinji Coalfield of China