Applications of Rayleigh Wave Detection Technique and Polymer Grouting Technology in Waterproof Construction

Chen, Jing Yi; Ummin, Okumura; Yu, Tao; Qi, Yujie

doi:10.4028/www.scientific.net/amm.405-408.748

Cited by 13 publications

(3 citation statements)

References 4 publications

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“…At present, by virtue of the characteristics of the strong permeability resistance [5], fast-setting [6], high expansion force [7], and eco-friendliness [8], the foamed polyurethane has been increasingly adopted as grouting material in civil engineering. As shown in Figure 1, the representative applications of the polymer grouting material include filling soil cavities to lift the sedimentary underground pipelines [9,10] or foundations [11,12] and constructing barriers to prevent water seepage [13,14] or the leakage of pollutants [14,15]. In these applications, the two raw materials, isocyanate and polyols, are simultaneously injected into soil at the constant mass ratio as alternatives to cement-based grouts [16,17], and after polymerization reaction, the PU matrices will be retained in the soil mass to play the reinforcing role [9,10,16].…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Polymer Grouting Material: Its Mechanical Behavior under Uniaxial Tension, Cyclic Tensile Loading, and Stress Relaxation

Zhang

Zhao³

et al. 2022

Geofluids

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At present, polyurethane (PU) has been extensively used as a grouting material in civil engineering. The mechanical properties of PU are the key to achieving the desirable grouting effect. This study presents the research results of the mechanical behavior of PU matrix under tensile, successive cyclic tensile, and stress relaxation at the nanoscale, using the coarse-grained molecular dynamics simulation method. The influences of the number of molecule chains and strain rate on the tensile mechanical properties are discussed, and the tensile deformation mechanism of PU matrix is revealed. The tensile strength of PU matrix is independent of loading path, and after yielding, the strain of PU matrix contains the elastic strain, plastic strain, and viscous strain. In the stress relaxation process, the evolution of the axial stress is mainly caused by the varied van der Waals interactions. The stress relaxation behavior of PU matrix can be described by the viscoelastic model consisting of one elastic element in parallel with one Maxwell element.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Polymer Grouting Material: Its Mechanical Behavior under Uniaxial Tension, Cyclic Tensile Loading, and Stress Relaxation

Zhang

Zhao³

et al. 2022

Geofluids

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“…Polymer material, also known as polyurethane, consists of polyol, isocyanate, and other raw materials. Due to the characteristics of lightweight, high expansion, strong permeability resistance, good durability, rapid curing, no pollution, etc., the polymer materials are widely used in foundation trenchless repair engineering and other infrastructures, such as trenchless repair of drainage pipeline leakage and settlement [1,2], antiseepage reinforcement of dam [3], and improvement of foundation [4,5]. erefore, it is of great engineering significance and theoretical value to study the damage characteristics of polymer plates under underwater explosions.…”

Section: Introductionmentioning

confidence: 99%

Damage Characteristics of Polymer Plates under the Impact of the Near‐Field and Contact Underwater Explosion

Liu

Zhao

Fang

et al. 2021

Advances in Materials Science and Engineering

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In order to study the damage characteristics of polymer plates under the impact of the underwater explosion, the underwater contact and near-field explosion tests of polymer plates were conducted using different explosive quantities. In this paper, eight polymer plates with the size of 500 mm × 500 mm × 60 mm were made, and eight groups of explosion tests were carried out by using the rock emulsion explosive and nonconductive detonators. The damage modes and spatial distribution characteristics of the polymer plate generated by the underwater contact and near-field explosion impact with different explosive quantities are compared and analyzed. In addition, the characteristics of the shock wave propagation in the plates are investigated. It can be observed that the main damage mode of polymer plate is overall damage under the contact underwater explosion. For the near-field explosion, the main damage mode changes to overall failure, and the damage of contact explosion to polymer plate is greater than that of underwater near-field explosion. The polymer plate can reduce and delay the shock wave effectively, but the effect decreases with the increase of explosive quantity in the underwater contact explosion.

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“…In the field of geotechnical engineering and engineering geological reconnaissance, transient Rayleigh wave detection method is also widely used [ 17 , 21 , 26 , 27 ], and it has been incorporated into the code for the measurement method of dynamic properties of subsoil [ 28 ] and other national standards in China.…”

Section: Introductionmentioning

confidence: 99%

Imaging of underground karst water channels using an improved multichannel transient Rayleigh wave detecting method

et al. 2018

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Geological and hydrogeological conditions in karst areas are complicated from the viewpoint of engineering. The construction of underground structures in these areas is often disturbed by the gushing of karst water, which may delay the construction schedule, result in economic losses, and even cause heavy casualties. In this paper, an innovative method of multichannel transient Rayleigh wave detecting is proposed by introducing the concept of arrival time difference phase between channels (TDP). Overcoming the restriction of the space-sampling law, the proposed method can extract the phase velocities of different frequency components from only two channels of transient Rayleigh wave recorded on two adjacent detecting points. This feature greatly improves the work efficiency and lateral resolution of transient Rayleigh wave detecting. The improved multichannel transient Rayleigh wave detecting method is applied to the detection of karst caves and fractures in rock mass of the foundation pit of Yan’an Road Station of Guiyang Metro. The imaging of the detecting results clearly reveals the distribution of karst water inflow channels, which provided significant guidance for water plugging and enabled good control over karst water gushing in the foundation pit.

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Applications of Rayleigh Wave Detection Technique and Polymer Grouting Technology in Waterproof Construction

Cited by 13 publications

References 4 publications

Molecular Dynamics Simulations of Polymer Grouting Material: Its Mechanical Behavior under Uniaxial Tension, Cyclic Tensile Loading, and Stress Relaxation

Molecular Dynamics Simulations of Polymer Grouting Material: Its Mechanical Behavior under Uniaxial Tension, Cyclic Tensile Loading, and Stress Relaxation

Damage Characteristics of Polymer Plates under the Impact of the Near‐Field and Contact Underwater Explosion

Imaging of underground karst water channels using an improved multichannel transient Rayleigh wave detecting method

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