Research on Mechanical Response of Polymer Grouting Repair for Longitudinal Cracks in Reconstructed and Expanded Expressway Pavement

Li, Songtao; Niu, Yongding; Wang, Baolin; Gao, Yanlong; Zhu, Yongchao

doi:10.1155/2022/5760674

Cited by 2 publications

(2 citation statements)

References 10 publications

(10 reference statements)

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“…It has been reported that the NRFP grouting material has an expansion volume ratio of 10–20 and a permeability coefficient of 10 −8 cm/s, and it is environmentally friendly [ 6 ]. By virtue of these superior material properties, NRFP grouting material has found its applications in the non-excavation rehabilitation of expressway pavement [ 7 ], underground pipes [ 8 ], and foundations [ 9 , 10 ], as well as building water barriers.…”

Section: Introductionmentioning

confidence: 99%

Compression-Softening Bond Model for Non-Water Reactive Foaming Polyurethane Grouting Material

Dong

Fang

et al. 2023

Polymers

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In this study, the uniaxial compression and cyclic loading and unloading experiments were conducted on the non-water reactive foaming polyurethane (NRFP) grouting material with a density of 0.29 g/cm3, and the microstructure was characterized using scanning electron microscope (SEM) method. Based on the uniaxial compression and SEM characterization results and the elastic-brittle-plastic assumption, a compression softening bond (CSB) model describing the mechanical behavior of micro-foam walls under compression was proposed, and it was assigned to the particle units in a particle flow code (PFC) model simulating the NRFP sample. Results show that the NRFP grouting materials are porous mediums consisting of numerous micro-foams, and with the increasing density, the diameter of the micro-foams increases and the micro-foam walls become thicker. Under compression, the micro-foam walls crack, and the cracks are mainly perpendicular to the loading direction. The compressive stress–strain curve of the NRFP sample contains the linear increasing stage, yielding stage, yield plateau stage, and strain hardening stage, and the compressive strength and elastic modulus are 5.72 MPa and 83.2 MPa, respectively. Under the cyclic loading and unloading, when the number of cycles increases, the residual strain increases, and there is little difference between the modulus during the loading and unloading processes. The stress–strain curves of the PFC model under uniaxial compression and cyclic loading and unloading are consistent with the experimental ones, well indicating the feasibility of using the CSB model and PFC simulation method to study the mechanical properties of NRFP grouting materials. The failure of the contact elements in the simulation model causes the yielding of the sample. The yield deformation propagates almost perpendicular to the loading direction and is distributed in the material layer by layer, which ultimately results in the bulging deformation of the sample. This paper provides a new insight into the application of the discrete element numerical method in NRFP grouting materials.

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Section: Introductionmentioning

confidence: 99%

Compression-Softening Bond Model for Non-Water Reactive Foaming Polyurethane Grouting Material

Dong

Fang

et al. 2023

Polymers

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“…Fang et al showed through experiments that polymers can efectively repair the settlement of high-speed railways and provide sufcient long-term durability under dynamic train loads [19,20]. Te research of Li et al shows that high polymer can efectively repair cracks and voids in pavement and efectively prevent pavement settlement [21,22]. Te polymer grouting material can sufciently and densely fll the damaged area, thereby controlling the unfavorable deformation and better restoring the structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of Secondary Lining Polymer Grouting Debonding Repair for Tunnel Construction Based on Parameter Inversion

Miao,

Liang,

et al. 2023

Advances in Civil Engineering

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The void phenomenon behind the tunnel lining has become the main cause of tunnel disease, easily triggering tunnel lining structure damage, shedding, water seepage, and other diseases that seriously threaten the normal operation of the tunnel. The void area behind the lining seriously reduces the seismic capacity of the tunnel. In this paper, the mechanical parameters of the surrounding rock are calculated by optimizing the inversion of the improved system identification sensitivity analysis method, and the numerical model of the tunnel’s dynamic response is optimized using the improved inversion results to study the repair effect and seismic capacity of the Longmenshan tunnel using polymer grouting to repair the void area behind the lining under the action of a seismic load. The results show that the displacement and stress at the top of the tunnel secondary lining void area are significantly reduced and close to normal after the repair of polymer grouting; however, the stress and displacement at the top of the secondary lining are significantly different under the action of seismic waves at the same peak at different site conditions, which indicates that the dynamic response of this tunnel model has obvious sensitivity to the seismic wave spectrum.

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Research on Mechanical Response of Polymer Grouting Repair for Longitudinal Cracks in Reconstructed and Expanded Expressway Pavement

Cited by 2 publications

References 10 publications

Compression-Softening Bond Model for Non-Water Reactive Foaming Polyurethane Grouting Material

Compression-Softening Bond Model for Non-Water Reactive Foaming Polyurethane Grouting Material

Seismic Response Analysis of Secondary Lining Polymer Grouting Debonding Repair for Tunnel Construction Based on Parameter Inversion

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