Development and permeability reinforcement characteristics of high-strength acrylic salt grouting materials for water-rich ultracataclasite

YANG Lei; MI Xiangyun; LI Zhaofeng; TU Wenfeng; XIE Yunpeng; HU Hao; WANG Kang

doi:10.11779/CJGE20231290

Volume 47 Issue 3

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Chinese Journal of Geotechnical Engineering > 2025 > 47(3): 525-534. > DOI: 10.11779/CJGE20231290

YANG Lei, MI Xiangyun, LI Zhaofeng, TU Wenfeng, XIE Yunpeng, HU Hao, WANG Kang. Development and permeability reinforcement characteristics of high-strength acrylic salt grouting materials for water-rich ultracataclasite[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(3): 525-534. DOI: 10.11779/CJGE20231290

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Development and permeability reinforcement characteristics of high-strength acrylic salt grouting materials for water-rich ultracataclasite

1.
Research Center of Geotechnical and Structural Engineering, Shandong University, Ji'nan 250061, China
2.
School of Qilu Transportation, Shandong University, Ji'nan 250002, China
3.
Sinohydro Bureau 14 Co., Ltd., Kunming 650041, China

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Received Date: December 28, 2023
Available Online: September 28, 2024

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Abstract

Abstract

Aiming at the problems of strong disasters caused by water-rich dense weak surrounding rock and weak applicability of the conventional grouting materials, a new type of high-strength acrylic acid grouting material is developed, its polymerization reaction mechanism and working performance are analyzed, and the permeability and reinforcement characteristics of the new material on dense pulverized silty rock are studied. Based on the organic-inorganic interpenetrating network method, the high-strength acrylic acid grouting material is developed, which is composed of the main agent, inorganic modifier, initiator, accelerator, crosslinking agent and other raw materials, and it has remarkable characteristics of high strength and high permeability. The polymerization reaction of the two components of the high strength acrylate material is sufficient after mixing, and the inorganic network structure is evenly interspersed in the acrylate organogels network. According to the orthogonal tests, the characteristics of the new materials with different compositions, such as the gelling time, compressive strength and water absorption expansion rate as well as the influence rules of the components, are obtained. The gelling time range of the slurry is 45~201 s, the uniaxial compressive strength of the gel is 1.2~2.1 MPa, and the water absorption expansion rate is 16%~51%. The sensitivity ranking of factors affecting the main working properties of the new materials is further clarified. In accordance with the laboratory tests and microanalytical analysis technology, the permeability and reinforcement characteristics of grout in dense crushed rock are studied. The results show that the permeability and diffusion capacity of the high-strength acrylate grout is close to that of the pure one, which is much higher than that of the cement grout. Moreover, the high-strength acrylate material has an obvious coating and strengthening effect on crushed rock particles, and the solid strength reache 2.31 MPa. It is 5.4 ~ 11.0 times the reinforcement strength of the pure acrylic salt material, which can provide a strong safety guarantee for disaster grouting control and safe excavation of tunnels.

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Development and permeability reinforcement characteristics of high-strength acrylic salt grouting materials for water-rich ultracataclasite

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