【摘要】 三向应力场中巷道塑性区的演化规律对巷道稳定性控制具有重要意义。强度准则是判断围岩破坏的依据，本文根据岩石能量理论建立了能量强度准则。以能量强度准则为基础并考虑巷道轴向应力，推导了三维应力环境下巷道塑性区边界方程。结果表明：岩石破坏所需畸变能与围压之间成正相关，能量强度准则能较好地描述岩石的强度特性，反映出应力Lode角效应和静水压力效应。塑性区形态主要由侧压系数λ决定，当λ逐渐增大时，塑性区形态演化规律呈现出“圆形→椭圆形→蝶形”。轴向应力主要影响塑性区的尺寸，轴向应力越接近水平应力，塑性区尺寸越小。应力环境和巷道尺寸一定时，影响塑性区扩展的主要因素为巷道煤岩体的单轴抗压强度和能量强度准则中材料参数，塑性区尺寸随二者的增大而减小。软煤巷道围岩强度低，承载能力弱，当其处于高偏应力场中且主应力角度发生偏转时，塑性区形态为旋转的蝶形，导致巷道发生非均匀大变形破坏。针对软弱破碎巷道围岩，提出了“掘前超前注浆加固+锚网索支护”的联合支护技术。该支护技术能够有效降低巷道的变形量和变形速率，保证巷道的稳定性。更多还原

【Abstract】 The evolution law of roadway plastic zone under three-dimensional stress field is of great significance to roadway stability control. The strength criterion is the basis for judging the surrounding rock failure. According to the rock energy theory, the energy strength criterion is established. Based on energy strength criterion and considering the roadway axial stress, the boundary equation of roadway plastic zone under three-dimensional stress field is derived. The results show that the distortion energy required for rock failure is positively correlated with confining pressure. The energy strength criterion can describe the strength characteristics of rock well and reflect the Lode angle effect and hydrostatic pressure effect. The plastic zone shape is mainly determined by the lateral pressure coefficient λ. When λ gradually increases, the plastic zone shape evolution shows ’circular→elliptical→butterfly-shaped’. Axial stress mainly affects plastic zone size. The closer the axial stress is to horizontal stress, the smaller the plastic zone size. When the stress environment and roadway size are constant, the main factors affecting plastic zone expansion are the uniaxial compressive strength of coal-rock mass of roadway and the material parameter in the energy strength criterion. The plastic zone size decreases with the increase of the two.更多还原