Experimental and numerical study on the mechanical properties of compressively precracked sandstone repaired by grouting

Zhang, Guangsen; Xiao, Ming-Li; Zhang, Yadong; Liu, Huai-Zhong; Li, Zhuo; Xie, Heping; He, Jian

doi:10.1016/j.conbuildmat.2022.128816

Cited by 13 publications

(1 citation statement)

References 32 publications

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“…Weng et al (Weng et al, 2022) showed that the infiltration grouting tests on fractured sandstone samples analyzed the flow and diffusion mechanism of the slurry, and the results showed that the final injection volume of grouting decreased with the increase of temperature and surrounding pressure, and the effective grouting time was inversely proportional to the slurry flow rate, while it was positively correlated with temperature. Zhang et al (Zhang et al, 2022) investigated the mechanical properties of compressed pre-cracked sandstone before and after grouting by triaxial compression tests with different surrounding pressures, and the results showed that the strength of grouted specimens mainly depended on the micromechanical properties of the contact surface between sandstone and cement paste, and the elastic modulus of grouted specimens was lower than that of uncracked sandstone. Liu et al (Liu et al, 2022) proposed an NMM-HM grouting model based on the numerical flow form method (NMM) to study the flow of slurry, and the results showed that the fracture grouting pressure could increase the fracture aperture, which is beneficial to grouting efficiency.…”

Section: Introductionmentioning

confidence: 99%

Analysis of energy consumption characteristics and fracture characteristics of moraine grouting solidified body under uniaxial compression

Li,

Jiang,

Feng

et al. 2023

Front. Earth Sci.

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Glacial movement causes massive accumulation of fine-grained moraine, which often induces slope instability, moraine debris flow, and other geological hazards due to the effects of rain and the ice-snow melting. This study used a modified phosphoric acid-water glass slurry for grouting and curing moraine, and analyzed the influencing law of water glass Baume degree and curing age on energy consumption characteristics as well as the fracture properties of the grout-cured body of moraine using the uniaxial compression test. The results showed that the gel time of phosphoric acid-water glass slurry increased with the increasing addition of phosphoric acid and that it had a mutation phenomenon. The gel time increased linearly with the increasing addition of phosphoric acid before the mutation. Moreover, the compressive strength, pre-peak total energy, pre-peak elastic energy, pre-peak dissipative energy, elastic energy density, dissipative energy density, and pre-peak fracture toughness of the moraine curing body at same curing age increased linearly with the increase of water glass Baume degree by 46%–218%. The compressive strength, pre-peak elastic energy, and pre-peak elastic energy density of the moraine curing body increased with the curing age but grew slowly from 3 days to 7 days and rapidly from 7 days to 14 days. Through regression analysis of the test results, the fracture toughness calculation formula was derived from an energy perspective. These research results have significant implications for the reinforcement of moraine strata grouting and glacial debris flow disaster prevention and control.

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Section: Introductionmentioning

confidence: 99%