Variation of mechanical properties of coal and rocks in the deep mine in-situ stress field

作者：Shen, Shuhao; Wu, Jiwen; Zhai, Xiaorong; Shi, Wenbao

来源：Journal of Mining & Safety Engineering, 2017, 34(6): 1200-1206.

DOI：10.13545/j.cnki.jmse.2017.06.025

• High in situ stress
• In-situ stress field
• Influence coefficient
• Non-linear relationships
• Prediction equations
• Stability evaluation
• Strength characteristics
• Tri-axial compression tests

The deep mining has gradually become common. In order to study the law of in-situ stress conditions and influences on the mechanical properties of deep coal and rocks, based on the kilometer-drillhole hydraulic fracturing technique, stress relief and AE method in coal mines, the in-situ stress field in the deep exploration area in Panji mine of Huainan is measured. By adopting MTS-816 and RMT-150B rock triaxial compression test system, the strength characteristics and deformation of 330 pieces of coal and rocks from 6 kinds of lithology have been studied in the deep in-situ stress field. The test results show that the high in-situ stress plays a decisive role in mechanical properties of coal and rocks;the strength of different lithologic rocks increases with increasing lateral pressure and presenting a nonlinear relationship;the peak strain of rocks increases linearly with increasing lateral pressure;the elastic modulus of gritstone, medium sandstone and mudstone are independent of the lateral pressure, but the elastic modulus of fine sandstone, siltstone and limestone increases linearly with the lateral pressure. Meanwhile, the prediction equation between the lateral pressure and the triaxial strength and the peak strain of different lithologic coal and rocks are established. the influence coefficients of each lithology is defined. The results can provide parameters and scientific basis for the deep engineering design and stability evaluation for surrounding rocks.

• 出版日期2017
• 单位安徽大学