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| Microscopic damage tests of creep rock mass under low-frequency disturbance conditions |
WANG Bo1, GAO Xiangyu1, SUN Hongxu1, TIAN Zhiyin1, MA Shiji1, JI Bo1, YU Kexiang1, HUANG Wanpeng2, WANG Jun3 |
(1. School of Emergency Technology and Management, North China Institute of Science and Technology, Sanhe, Hebei 101601, China; 2. College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, Shandong
266590, China; 3. School of Civil Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, China)
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Abstract In the process of deep mining, the dynamic waves generated by mining operations and other activities are predominantly influenced by low-frequency disturbances during the propagation of surrounding rock. These disturbances can easily trigger dynamic disasters such as rock bursts and roof collapses, thereby compromising the stability of the roadway surrounding rock. To investigate the damage characteristics of low-frequency disturbances on creep rock masses, this study focuses on red sandstone and employs the RRTS-IV rock rheological disturbance effect test system to conduct rheological disturbance tests under low-frequency conditions. The results indicate that: (1) A disturbance-sensitive point exists in the rheological rock mass under low-frequency disturbance conditions. As the disturbance frequency increases, the intensity of this sensitivity point decreases, making the rock mass more susceptible to entering the disturbance-sensitive area. (2) Before the axial static load pressure reaches the strength of the disturbance-sensitive point, the axial strain changes gradually decrease with increasing axial pressure, demonstrating nonlinear elastic behavior. Once disturbance-sensitive point is exceeded, the rock mass exhibits heightened sensitivity to external disturbances, leading to intensified damage accumulation and a higher likelihood of instability failure. (3) Analyzing the T2 spectrum and spectral peak area, the ratio of the large pore peak area to the small pore peak area ( ) is utilized to characterize the damage degree of the rock mass under varying frequency conditions. It is observed that the damage degree of the rock mass is positively correlated with the disturbance frequency. (4) From the perspective of the peak area of the T2 spectrum, a microscopic damage evolution equation for the rock under disturbance frequencies of 0.2, 0.5, and 1.0 Hz is established, and the rationality and applicability of this equation are validated by employing the constitutive model of rock mechanics. The research findings provide theoretical support for predicting the failure process of surrounding rock and evaluating the long-term stability of roadway surrounding rock.
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2025, Vol. 44 
