Analytical Solution of the Grouting Reinforcement Response of a Circular Cavern in Deeply Buried Fractured Surrounding Rock under a Nonuniform Stress Field

Abstract

Grouting is widely utilized to reinforce fractured surrounding rock. However, presently, the secondary stress distribution of fractured surrounding rock after grouting is not distinct, which hinders the accurate evaluation of the grouting effect. Therefore, a complex variable function solution is provided for the evolution of the stress field and the displacement field around the reinforced fractured surrounding rock subjected to a nonuniform load. By comparing the evolution of the stress and radial displacement fields around the cavern, the reinforcement effect on the fractured surrounding rock is quantitatively confirmed. The results show that grouting has an obvious modification effect on fractured surrounding rock: its radial stress and circumferential stress fields are affected to different degrees, and the circumferential stress is more obvious. Grouting makes the circumferential stress peak transfer from the wall of the cavern to the roof and floor of the cavern, which is beneficial to the stability of the cavern. The radial displacement around the cavern also decreases. The displacement of the wall decreases by approximately 24.0%, and the radial displacement of the roof and floor decreases by approximately 61.8%.

Stress redistribution in a multilayer chamber for compressed air energy storage in abandoned coalmine: Elastic analytical insights and material choice

“…Comparison of our results with those of Du et al 42 (A) radial stress concentration σ r / γH , (B) circumferential stress concentration σ θ / γH along horizontal direction, (C) radial stress concentration σ r / γH , and (D) circumferential stress concentration σ θ / γH along vertical direction.…”

“…Comparison of our results with those of Dong et al41 (A) radial stress concentration σ r /γH, (B) circumferential stress concentration σ θ /γH along horizontal direction, (C) radial stress concentration σ r /γH, and (D) circumferential stress concentration σ θ /γH along vertical direction. Comparison of our results with those of Du et al42 (A) radial stress concentration σ r /γH, (B) circumferential stress concentration σ θ /γH along horizontal direction, (C) radial stress concentration σ r /γH, and (D) circumferential stress concentration σ θ /γH along vertical direction. F I G U R E 6 A sketch model for numerical simulations on a three-layer chamber.F I G U R E 7 Stress-strain curve of rock in a coal mine.…”

“…The analytical solution derived in Section 2 is compared with Dong et al 41 and Du et al 42 in Figures 4 and 5, respectively. Their solutions also included analytical solutions and numerical simulations.…”

Control Effect Analysis and Engineering Application of Anchor Cable Beam-Truss Structure on Large-Deformation Roadway in Deep Coal Mine

“…To this end, scholars have proposed various types of active, passive, and combined supports through a variety of methods [3][4][5]. Overall, the roadway surrounding-rock control can be divided into fve basic support forms, namely, the basic support within the roadway [6,7] (wood bracket, metal bracket, and stone bracket), strengthening support in roadway [8,9] (permanent strengthening support and temporary strengthening support such as single hydraulic prop), roadway side support [10,11] (wood crib, dense pillar, gangue wall, concrete wall, and flling wall), grouting modifcation [12][13][14] (ordinary portland cement, Marysan, and new polymer organic and inorganic modifed materials), nonsingle support form [15][16][17] (above two and multiple combined support technologies). Te surroundingrock supporting theory of coal mine roadway mainly includes suspension theory, composite beam theory, composite arch theory, maximum horizontal stress theory, and surrounding rock strength strengthening theory [18].…”

Recycling of Waste Stone Powder in High Fluidity Grouting Materials for Geotechnical Engineering Reinforcement

“…Whether in a closed or natural environment, grout is subject to limitations, such as low bleeding rate, long-term non-condensation, poor mechanical performance, etc. [1][2][3][4], making it difficult to consolidate into a hardened body that is resistant to external loads. Furthermore, it is unable to properly strengthen geotechnical engineering.…”