Analysis of Crack Initiation and Propagation Thresholds of Inclined Cracks under High-Pressure Grouting in Ordovician Limestone

Bin Xu, Shuning Dong, Shangxian Yin, Shuxia Li, Yanling Xu and Zhenxue Dai
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Bin Xu: Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China
Shuning Dong: Xi’an Research Institute of China Coal Technology & Engineering Group Corp, Xi’an 710077, China
Shangxian Yin: Hebei State Key Laboratory of Mine Disaster Prevention, North China Institute of Science and Technology, Beijing 101601, China
Shuxia Li: College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China
Yanling Xu: School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
Zhenxue Dai: College of Construction Engineering, Jilin University, Changchun 130026, China

Energies, 2021, vol. 14, issue 2, 1-14

Abstract: Control of the grouting pressure within the critical grouting pressure for crack propagation in Ordovician limestone can not only ensure grout penetration length, but also prevent the risk of creating an artificial water channel. Based on the fracture mechanics theory, a formula was proposed to calculate the critical grouting pressure of mixed mode I-II cracks in Ordovician limestone. The necessary conditions for tilted crack opening, the rationality of the existing empirical value of the maximum allowable grouting pressure was investigated based on the mechanical model. The RFPA 2D -Flow numerical simulation software was used to evaluate the deduced theory. The research results show that the deduced theoretical calculation formula of the critical grouting pressure agrees with the numerical simulation results; when the mixed mode I-II fracture initiation occurs, the grouting pressure exceeds the perpendicular stress of the overlying rock; the greater the density of the overlying rock mass, the greater the value of grouting pressure for fracture initiation; when the side pressure coefficient was ≥1, crack dip angle increased and the grouting pressure for fracture initiation tended to decrease; and the empirical grouting pressure at the maximum allowable grouting pressure is 2.0–2.5 p w , which will not cause propagation and failure of the existing crack.

Keywords: inclined crack; open-mode crack; crack instability; critical grouting pressure (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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