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

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...

Full description

Saved in:
Bibliographic Details
Published in:Energies (Basel) 2021-08, Vol.14 (15), p.4516
Main Authors: Liu, Weitao, Qin, Yueyun, Meng, Xiangxi, Pang, Lifu, Han, Mengke, Song, Zengmou
Format: Article
Language:English
Subjects:
Cement
Coal mining
Coalbed methane
Compressive strength
Design techniques
Experiments
fracture plugging
Fractures
Material properties
Microcracks
Minerals
plasticity grouting
principal component analysis
Principal components analysis
Research methodology
Response surface methodology
Rock masses
Rocks
Safety engineering
Surface analysis (chemical)
Transition zone
Viscosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14154516