Author:
Chen Yi,Rao Junying,Zhao Changjie,Xue Yanghao,Liu Chang,Yin Quan
Abstract
AbstractTo investigate the mechanical properties of fractured dolomite, this study analyzed the fracture characteristics (dip angle, length, position, quantity) using the Pearson coefficient and MIC coefficient. Subsequently, the data pertaining to fracture characteristics is preprocessed using a third-degree polynomial, and a three-classification strategy is implemented to improve the logistic regression algorithm to establish the strength prediction model of fractured dolomite. Furthermore, the significance order of the impact of fracture characteristics on rock strength was determined using the numerical simulation software PFC3D, and the dip angle effect was explained from the perspective of internal fracture propagation within the rock. The results show that: (1) When the regularization coefficient λ = 10,000, the algorithm has the highest prediction accuracy and the strongest model generalization ability. (2) The numerical simulation analysis software PFC3D can accurately invert rock failure process and characteristics, and the order of influence of fracture characteristics on rock strength is dip angle > length > position.
Funder
the National Natural Science Foundation of China
Hunan Natural Science Foundation
Publisher
Springer Science and Business Media LLC
Reference28 articles.
1. Yuyong, J., Xiuli, Z., Quansheng, L. & Weizhong, C. Simulation of rock crack propagation using discontinuous deformation analysis method. Chin. J. Rock Mech. Eng. 26, 682–691 (2007).
2. Peidong, H., Junying, R., Tao, X., Jian, Y. & Songbai,. Study on the effect of cracks on dolomite compressive properties. Chin. J. Undergr. Space Eng. 15, 990–1000 (2019).
3. Dianrui, M. et al. An improved smoothed particle hydrodynamics method for simulating crack propagation and coalescence in brittle fracture of rock materials. Theor. Appl. Fract. Mech. 119, 103355 (2022).
4. Wang, Z., Zhao, W. & Pan, K. Analysis of fracture evolution characteristics of coplanar double fracture rock under uniaxial compression. Geotech. Geol. Eng. Int. J. 38, 343–352 (2020).
5. Yang, W. et al. Dem numerical simulation study on fracture propagation of synchronous fracturing in a double fracture rock mass. Geomech. Geophys. Geo-Energy Geo-Resour. https://doi.org/10.1007/s40948-020-00162-0 (2020).