Chemical expansion anchoring agent for soft rock roadway surrounding rock and preparation method thereof

By preparing a chemically expanded anchoring agent, combined with low-curing unsaturated polyester resin and low-shrinkage additives, a network structure is formed, which solves the problems of poor curing strength and high shrinkage rate of traditional anchoring agents in soft rock tunnels. This achieves a stable bond between the anchoring agent and the anchor cable, providing strong support.

CN118271028BActive Publication Date: 2026-07-24CCTEG COAL MINING RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CCTEG COAL MINING RES INST
Filing Date
2024-03-14
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Traditional unsaturated resins used as anchoring agents in soft rock tunnels suffer from poor curing strength and high shrinkage, making it difficult to fully bond with boreholes and anchor cables, resulting in unstable anchoring.

Method used

A chemically expanding anchoring agent is used, which combines low-curing unsaturated polyester resin with low-shrinkage additives, fillers, accelerators and expanding agents. During the preparation process, polymer microgels and calcium sulfate whiskers are coated with a silica film to form a network structure, which reduces the shrinkage rate and improves the compressive strength.

Benefits of technology

It achieves effective integration with anchor cables in weak and fractured surrounding rock, provides strong technical support, improves the curing strength and compressive strength of the anchoring agent, and ensures stable anchoring of anchor cables in soft rock tunnels.

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Abstract

The present application relates to the technical field of anchoring agent, in particular to a chemical expansion anchoring agent for soft rock roadway surrounding rock and a preparation method thereof, the chemical expansion anchoring agent comprises resin mud glue and curing agent; the resin mud glue comprises low-curing unsaturated polyester resin, low-shrinkage additive, filler, accelerator and expansion agent; the curing agent comprises peroxi-benzoyl, chlorinated benzene, diphenyl and benzene; the low-curing unsaturated polyester resin contains styrene derivative, and the introduced polymer microgel can improve the compressive strength; the low-shrinkage additive is prepared by modifying and coating calcium sulfate whisker with sodium oleate, and a double bond is introduced on the surface of the low-shrinkage additive, so that the shrinkage rate is reduced. The chemical expansion anchoring agent for soft rock roadway surrounding rock prepared by the present application can be combined with the anchor rod cable as a whole in the soft and broken surrounding rock drilling, so that the anchor rod cable is stably anchored in the soft and broken surrounding rock, and strong technical support is provided for the support of soft rock roadway surrounding rock.
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