In situ stress testing can improve the safety and efficiency of coal mining. Identifying the Kaiser effect point is vital for in situ stress calculations; however, the in situ stress calculation is limited by the rock sampling angle. Here, the Kaiser effect point identification theory is established and applied to the Xuyong Coal Mine. Uniaxial compression and acoustic emission experiments were carried out on sandstone with 6 sampling directions. Furthermore, COMSOL simulation is applied to study the in situ stress distribution in the coal mine to verify the calculation accuracy. The results are as follows. 1) The failure mode of non-bedded and vertical-bedded rocks is primarily tensile shear failure with obvious brittleness in mechanical and acoustic emission characteristics. Shear slip along the bedding plane is the primary failure mode of inclined-bedded rock. Additional take-off points exist in the AE count curve. 2) The Kaiser point identification method based on the variation of AE count curve parameters Δt_i and τ_i can effectively calculate the in situ stress. According to the numerical value of Kaiser point and sampling direction, the in situ stress of the conveyor roadway in the Xuyong Coal Mine was calculated as σ₁ = 22.81 MPa, σ₂ = 10.87 MPa and σ₃ = 6.14 MPa. 3) By the COMSOL simulation study, it was found that a stress concentration zone of 16.13 MPa exists near the two sides roadway. Compared with the Kaiser effect method, the deviation rates of the three-direction principal stress calculated by COMSOL were all less than 5%. This verifies that the in situ stress calculation by Kaiser effect in this study can be applied to the Xuyong Coal Mine.

原位应力测试可以提高煤矿开采的安全性和效率。确定凯泽效应点对于地应力计算至关重要；然而，地应力计算受到岩石采样角度的限制。在此，建立了Kaiser效应点识别理论，并将其应用于叙永煤矿。对砂岩进行了6个采样方向的单轴压缩和声发射实验。此外，还应用 COMSOL 仿真来研究原位煤矿应力分布验证了计算的准确性。结果如下。1）无层状和直层岩石的破坏模式以拉剪破坏为主，力学和声发射特性具有明显的脆性特征。沿层理面的剪切滑移是斜层岩的主要破坏模式。AE 计数曲线中存在其他起飞点。2）基于AE计数曲线参数Δt _i和τ _i变化的Kaiser点识别方法可以有效计算地应力。根据Kaiser点的数值和采样方向，原位计算得出叙永煤矿输送巷道应力为σ ₁ = 22.81 MPa、σ ₂ = 10.87 MPa、σ ₃ = 6.14 MPa。3）通过COMSOL模拟研究发现，两侧巷道附近存在16.13 MPa的应力集中区。与Kaiser效应法相比，COMSOL计算的三向主应力偏差率均小于5%。这验证了本研究中凯泽效应地应力计算可以应用于叙永煤矿。