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岩石硐室开挖或巷道掘进过程中,材料的采动力学行为取决于应力场的真实转换过程,是对应力场的真实响应,区别于材料本征力学行为。由此,设计采动力学试验,依据开挖过程中煤岩体支承压力与水平应力响应过程,从理论上与传统常规三轴试验材料本征力学行为结果对比,讨论采动力学行为下应变软化过程能量释放特性及突发性。进一步对地应力在能量存储的构成进行讨论,认为采动力学试验破坏所需要的能量远小于传统试验,合理解释煤岩体发生动力破坏的机制,浅部也有可能发生动力破坏,高地应力是能量聚集的主导因素,是发生动力破坏的必要条件而非充分条件。
During rock tunnel excavation or roadway excavation, the mechanical behavior of mining material depends on the true conversion process of stress field, which is the true response to stress field, which is different from the intrinsic mechanical behavior of material. Therefore, the mining mechanical test is designed. According to the bearing pressure and horizontal stress response of coal and rock mass during excavation, the results are compared with the results of intrinsic mechanical behavior of conventional triaxial test materials in theory, and the strain softening Process energy release characteristics and burst. Further discussion is made on the constitution of energy storage in ground stress, and the energy required for the failure of mining mechanics test is much less than that of the conventional test, which reasonably explains the mechanism of dynamic failure of coal and rock mass, and the power failure may also occur in the shallow part. The high ground stress is energy The leading factor of aggregation is a necessary condition rather than an adequate condition for power failure.