Experimental and practical investigation of the sealing efficiency of cement grouting in tortuous fractures with flowing water

Du, Xueming; Fang, Hongyuan; Wang, Shanyong; Xue, Binghan; Wang, Fuming

doi:10.1016/j.tust.2020.103693

Cited by 50 publications

(20 citation statements)

References 21 publications

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“…Substituting equation ( 14) in equation (18), we obtain…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…Zhang et al [17] proposed a stepwise calculation method for describing the grouting process according to pressure and flow control conditions and analyzed the pressure distribution in the grouted zone using case studies. Du et al [18] performed a series of experiments to show the sealing efficiency mechanism of cement grouting in tortuous fractures with flowing water and verified it using engineering applications. Liang et al [19] reported a critical inclined angle (12.4°) that differentiates the grout patterns into two types, namely, the gel deposition grout pattern and erosion dispersion grout pattern.…”

Section: Introductionmentioning

confidence: 99%

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Cement Slurry Plugging Law and Optimal Plugging Flow Rate at a High Hydraulic Gradient

Jia

Liu

et al. 2021

Advances in Civil Engineering

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With the continuous development of coal and rock mass engineering, water inrush grouting has become an urgent problem in engineering disaster management. Herein, a theoretical model of the optimal plugging flow rate was established, and a comparative theoretical analysis was performed based on the results of indoor model tests. The particle incipient velocity was defined as the optimal plugging flow rate. The effects of hydrodynamic velocity, water-cement ratio, grouting pressure, and fracture aperture on the cement slurry grouting plugging were studied, and the optimal threshold of the plugging flow rate was obtained for theoretical model verification. Results showed that, at a high hydraulic gradient, the plugging effect of the grout was mainly affected by the hydrodynamic velocity, water-cement ratio, and grouting pressure (listed in the order of importance). When the hydrodynamic velocity was low, the difference in the slurry deposition thickness was large under different water–cement ratios and pipe diameters. When the hydrodynamic velocity was increased, the influence of various factors on the slurry deposition thickness decreased. Through a comparative analysis of the experimental and theoretical values, the optimal plugging velocity of pure cement slurry was 0.5–0.55 m·s−1 under different conditions, and the error between the experimental and theoretical values was less than 0.1 m·s−1, which confirmed the rationality of the proposed model.

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“…Substituting equation ( 14) in equation (18), we obtain…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cement Slurry Plugging Law and Optimal Plugging Flow Rate at a High Hydraulic Gradient

Jia

Liu

et al. 2021

Advances in Civil Engineering

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show abstract

“…e model is established with the X-direction as the longitudinal bridge direction, the Ydirection as the transverse bridge direction, and the Z-direction as the vertical direction. After the model is meshed, the full bridge has more than 3,900 nodes and more than 2,000 elements [15,16].…”

Section: Project Overview and Establishment Of The Finite Element Modelmentioning

confidence: 99%

Auxiliary Piers on Long-Span Specially Shaped Mixed Steel Structure Main Tower Cable-Stayed Bridge: Research on the Impact on the Dynamic Performance

Guo

Cui²,

2021

Advances in Materials Science and Engineering

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This study investigates the influence of auxiliary piers on the natural frequency, deformation characteristics, displacements of the related parts, and internal forces of a long-span heterogeneous steel-structured main tower cable-stayed bridge. Taking the Guohe Third Bridge in Anhui Province as an example, the software ANSYS was used to establish a three-dimensional finite element model of a cable-stayed bridge, and the dynamic characteristics of a long-span specially shaped hybrid steel structure main tower cable-stayed bridge with auxiliary piers added to single span and double spans were analysed. The results show that when one or three pairs of auxiliary piers are added to a single span, the changes in the natural frequency and deformation characteristics are smaller than those when there are no auxiliary piers. When one or three pairs of auxiliary piers are added to each of the two spans, the natural frequency and deformation characteristics are relatively low. Auxiliary piers induce relatively large changes; the changes with 3 pairs of auxiliary piers for a single span is compared with those with 1 pair for a single span, and 3 pairs and 1 pair of auxiliary piers are added to both spans for comparison. The natural vibration frequency and deformation characteristics exhibit relatively small changes; the presence or absence of auxiliary piers and the number of auxiliary piers have a greater influence on the vertical displacement of the main girder and less influence on the vertical displacement of the main tower. An appropriate number of auxiliary piers are beneficial to the seismic resistance of a cable-stayed bridge, and if the number of auxiliary piers is too large, the seismic capacity of the bridge is reduced; it is recommended that a pair of auxiliary piers be added to both spans to optimize the overall dynamic performance of a cable-stayed bridge. This research method can be used on similar cable-stayed bridges to optimize their dynamic characteristics by setting a certain number of auxiliary piers.

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“…The coupling process can be divided into four steps: model preparation, coupling process defintion, coupling calculation and post-processing. 49,50 The calculation process is shown in Figure 5. The flow field and the structure of PCCP can transfer deformation and force by satisfying the conservation of momentum, the conservation of energy, and the conservation of mass as shown in Figure 6.…”

Section: Mpcci and Fluid-structure Coupling Solving Processmentioning

confidence: 99%

Mechanical responses of bell‐and‐spigot joints in buried prestressed concrete cylinder pipe under coupled service and surcharge loads

Zhai

Zhang

Fang

et al. 2020

Structural Concrete

Self Cite

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Prestressed concrete cylinder pipe (PCCP) is widely used in hydraulic engineering. The bell-and-spigot joint is a weak point along a PCCP pipeline, since damage of joint can affect the operation of the whole pipeline. In this paper, a threedimensional numerical model of buried PCCP, considering the simulation of rubber gasket in bell-and-spigot joint is established. The fluid-structure coupling of PCCP is accomplished using the Mesh-based parallel Code Coupling Interface (MpCCI), where the pipe and the surrounding soil are characterized in the software ABAQUS, and the pressurized water is modeled in the software FLUENT. The force and rotation angle at joints of PCCP under different conditions, including surcharge load, loading location, cover depth, and internal pressure, are analyzed. It is shown that the rotation angle of joint exceeds the allowable value, when the surcharge load is greater than 180 kPa. Compared with the effect of surcharge load, the offset distance (i.e., distance between the loading position and the pipe axis) has a greater influence on the development of horizontal displacement and rotation angle. As the offset distance increases, both the horizontal displacement and rotation angle at joints increase first, and they decrease after the peak. K E Y W O R D Sbell-and-spigot joint, fluid-structure coupling, mechanical response, prestressed steel cylinder concrete pipe (PCCP), surcharge load Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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Experimental and practical investigation of the sealing efficiency of cement grouting in tortuous fractures with flowing water

Cited by 50 publications

References 21 publications

Cement Slurry Plugging Law and Optimal Plugging Flow Rate at a High Hydraulic Gradient

Cement Slurry Plugging Law and Optimal Plugging Flow Rate at a High Hydraulic Gradient

Auxiliary Piers on Long-Span Specially Shaped Mixed Steel Structure Main Tower Cable-Stayed Bridge: Research on the Impact on the Dynamic Performance

Mechanical responses of bell‐and‐spigot joints in buried prestressed concrete cylinder pipe under coupled service and surcharge loads

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