Abstract
It is difficult to support roadway with anchor cable in view of impact tendency in impinging liability roadway; a new material of inorganic and high‐performance full‐length anchoring material for anchoring cable is developed by adding several modifiers with ultrafine cement as the main material. The purpose is to improve the mechanical properties and durability of cement‐based materials, improve the coordination of anchor cable support system, and ensure the stability of surrounding rock of mining roadway. The new full‐length anchoring material is developed by optimizing the proportion of different components of the material, and the mechanical properties of the new material were studied. The anchoring force of resin anchoring agent, ordinary Portland cement, blank ultrafine cement, and new full‐length anchoring material are tested. Based on SEM microscopic characterization, the fracture types and failure characteristics of resin anchoring agent and full‐length anchoring material are researched. The results show that the optimal content of each component of the new inorganic high‐performance full‐length anchorage material is as follows: the content of component A is 15%, the content of component B is 3%, the content of component C is 0.2%, the content of component D is 1%, and the content of component E is 1%; the tensile test shows that the full‐length anchoring material has good bonding property, high anchoring strength, strong stability, and good rock coupling. SEM microstructure and morphology analysis have showed that the new anchorage materials can fully hydrate each other, resulting in a relatively dense stone body. The new full‐length anchoring material can effectively improve the anchoring force and improve the stability of the anchor cable and has significant performance advantages and good engineering applicability, and it has the advantages of lower cost and safer to use. The new material is a very good supporting material for roadway.
Highlights
In the process of coal mining in the western region of China (Loess Plateau region), the roof of coal seam is mostly mudstone with poor cementing property
If the conventional anchor cable support system is used for support, the failure of anchor cable and roof subsidence will often be caused by the broken coal and rock mass above the roof due to repeated impact
The auxiliary means to deal with rock burst support system mainly include the following: lengthen the anchor cable and increase the density of anchor cable, rock grouting, and so forth. e lengthening of the anchor cable increases the length of the anchor cable in the hole, which increases the expansion of the anchor cable and weakens the supporting force
Summary
In the process of coal mining in the western region of China (Loess Plateau region), the roof of coal seam is mostly mudstone with poor cementing property. According to the field investigation, long anchor cables are generally used for roadway support under the environment of rock burst (e.g., 7.4 m, 8.6 m, and 9.8 m), and this is basically unable to achieve full length anchorage of resin anchoring agent for anchor cables. E material properties need to have “micro permeability, high strength, strong bonding, injectability”; “micro penetration” is to reduce the particle size of the material molecule and increase the fluidity and it can better diffuse into the micro cracks, so as to improve the anchoring force; “high strength” means that the material is modified to meet the strength requirements by optimizing the material ratio and adding special reinforcing agent. There are few studies on full-length anchorage; relevant domestic and foreign regulations do not specify a unified industry standard, especially for the uneven development of cracks in roadway surrounding rock and the difficulty of anchor cable support. In order to solve this problem, a new type of inorganic anchoring material is developed by adding some modifiers and using ultrafine cement as the main material through proportioning experiment. e anchoring performance of the new material is tested by designing the bolt pull-out experiment. e development of new materials further guarantees the stability of the anchor cable support system for loose and broken surrounding rock. is research has remarkable economic benefit, practical value, and popularization and application prospect
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