Basic Experimental Study of Plasticity Material for Coal Rock Fracture Grouting Based on RSM-PCA Technology

Weitao Liu, Yueyun Qin, Xiangxi Meng, Lifu Pang, Mengke Han and Zengmou Song
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Weitao Liu: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Yueyun Qin: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Xiangxi Meng: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Lifu Pang: College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Mengke Han: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Zengmou Song: College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China

Energies, 2021, vol. 14, issue 15, 1-20

Abstract: The internal fractures in coal and rock mass are important factors affecting the safety of underground engineering such as coalbed methane exploitation, so the comprehensive properties of materials used to seal the fractures are particularly critical. In this paper, firstly, the indexes of the main factors affecting the plugging material (viscosity, bleeding rate, setting time, and strength) were analyzed. Then, the sensitivity of the materials used to seal the fractures was studied and discussed using a principal component analysis and response surface analysis (RSM-PCA). The primary conclusions are as follows: (1) Bleed rate and setting time were the first principal components affecting the comprehensive properties of the plugging materials, and compressive strength was the second principal component. (2) The regression equation was established to characterize the comprehensive properties of the integrated plugging materials, and the optimal mix ratio was 34% of cement content, 11% of sand content, and 0.53 of the W/C. (3) The microscopic results showed that the silicate minerals in the consolidated body grow in a bridging manner and formed a mixed gel with cement hydration product to fill the pores and microcracks and improved the interface transition zone.

Keywords: fracture plugging; plasticity grouting; response surface methodology; principal component analysis (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 references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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