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Article

Study on the Damage Evolution and Failure Mechanism of Floor Strata under Coupled Static-Dynamic Loading Disturbance

1
School of Science, Shandong Jianzhu University, Jinan 250101, China
2
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China
3
School of Civil Engineering, Xuzhou University of Technology, Xuzhou 221116, China
*
Author to whom correspondence should be addressed.
Processes 2024, 12(7), 1513; https://doi.org/10.3390/pr12071513
Submission received: 18 June 2024 / Revised: 11 July 2024 / Accepted: 13 July 2024 / Published: 18 July 2024

Abstract

In the field test, we found that the failure depth of the goaf floor strata tends to be further because the periodic breaking and caving of the immediate roof, upper roof, and roof key stratum has dynamic stress disturbance effects on the floor. To further analyze its formation mechanism, this paper studies the damage evolution and fracture mechanism of goaf floor rock under the coupled static-dynamic loading disturbance caused by roof caving, based on the stress distribution state, the damage evolution equation of coal measure rock, the damage constitutive model, and the fracture criterion of floor rock. The main conclusions are listed as follows: 1. Based on the mining floor stress distribution, the floor beam model establishes the response mechanism of floor rock stress distribution. Also, the equation of stress distribution at any position in floor strata under mining dynamic load is given. 2. Combining the advantages of Bingham and the Generalized-Boydin model, the B-G damage constitutive model is established, which can describe the constitutive characteristics of coal measure rock under the coupled static-dynamic loading disturbance well. Furthermore, the variation law of parameters changing with strain rate is analyzed. 3. According to the twin-shear unified strength yield theory and the B-G damage constitutive model, coal measure rock’s twin-shear unified strength damage fracture criterion is established. Finally, the stress distribution expression of floor strata under concentrated and uniform dynamic loads is introduced, and the fracture criterion of goaf floor strata under a coupled static-dynamic loading disturbance is proposed.
Keywords: mining-induced rock mechanics; coupled static-dynamic loading; B-G damage model; damage and fracture criterion; floor stress distribution state mining-induced rock mechanics; coupled static-dynamic loading; B-G damage model; damage and fracture criterion; floor stress distribution state

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MDPI and ACS Style

Li, H.; Bai, H.; Xu, W.; Li, B.; Qiu, P.; Liu, R. Study on the Damage Evolution and Failure Mechanism of Floor Strata under Coupled Static-Dynamic Loading Disturbance. Processes 2024, 12, 1513. https://doi.org/10.3390/pr12071513

AMA Style

Li H, Bai H, Xu W, Li B, Qiu P, Liu R. Study on the Damage Evolution and Failure Mechanism of Floor Strata under Coupled Static-Dynamic Loading Disturbance. Processes. 2024; 12(7):1513. https://doi.org/10.3390/pr12071513

Chicago/Turabian Style

Li, Hailong, Haibo Bai, Wenjie Xu, Bing Li, Peitao Qiu, and Ruixue Liu. 2024. "Study on the Damage Evolution and Failure Mechanism of Floor Strata under Coupled Static-Dynamic Loading Disturbance" Processes 12, no. 7: 1513. https://doi.org/10.3390/pr12071513

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