Grouting Mechanism of Cement-Based Slurry in a Concentric Annulus under High Groundwater Pressure

Zhang, Weijie; Han, Chenghao; Zhang, Lianzhen; Wei, Jiuchuan; Yin, Huiyong; Han, Wei; Xie, Chao; Zhou, Wenwu

doi:10.1155/2019/2587035

Cited by 5 publications

(4 citation statements)

References 35 publications

(57 reference statements)

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“…Substituting equation (17) in equation ( 16), we obtain…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

“…Combining numerical simulations and laboratory experiments, Chang [16] proposed a grouting treatment method that "controlled the flow rate at the gushing point + provided preferential treatment for branch pipelines + combined grouting and blocking for main pipelines." 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.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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 (17) in equation ( 16), 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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“…Xie et al [ 33 ] found that the apparent viscosity of fresh paste decreased with the increase of the amount of bentonite slurry. Zhang et al [ 34 ] used the MATLAB program developed to study the flow of cement slurry in the concentric ring and determine the slurry viscosity distribution in the grouting area. Assefa et al [ 35 ] established an empirical model of the relationship between slurry viscosity, solid volume fraction, maximum solid volume fraction, average particle size and uniformity coefficient by studying the viscosity of multi-particle Bingham slurry at high solid concentration.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

2020

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The grouting method is a technical means to prevent and control the thermal damage of the tunnel with high ground temperature in the underground hot water area, and the viscosity characteristic of the slurry is the key factor of grouting treatment. When grouting in high ground temperature geological conditions, the slurry inevitably has both time-varying and temperature-varying characteristics of viscosity in the process of filling high-temperature fissures and plugging geothermal water. At present, the research on the viscosity characteristics of slurry at high temperature is rarely reported in the literature. In this paper, laboratory tests were carried out to measure the time-varying viscosity of ordinary cement slurry; cement-sodium silicate slurry, widely used in engineering; and high ground temperature grouting slurry (HGTGS), independently developed by our research group, at different preheating temperatures (20, 40, 60, 80 °C). The viscosity function curves of the three kinds of slurry were obtained by function fitting method, and the viscosity variation law of slurry was analyzed. The study found that the time-varying process of viscosity of the cement-sodium silicate slurry and the HGTGS in specific temperature conditions can be divided into two stages: The slow rising period of viscosity and the rapid rising period of viscosity. Whereas, the time-varying process of viscosity of ordinary cement slurry in specific temperature conditions includes only one stage of the slow rising period of viscosity. The viscosity of ordinary cement slurry and cement-sodium silicate slurry increases with the increase of temperature, while the viscosity of the HGTGS decreases with the increase of temperature. There are corresponding viscosity time-varying equations for the three kinds of slurry in different temperature conditions. The viscosity time-varying equation of the ordinary cement slurry accords with the linear function form, and the viscosity time-varying equation of the cement-sodium silicate slurry accords with the power-law function form. The viscosity time-varying equation of the HGTGS conforms to the exponential function form. On this basis, the unified description equation of the viscosity characteristics of grouting slurry in high ground temperature and the applicability of different types of grouting materials are obtained. This study has a certain reference value and guidance for theoretical analysis, numerical simulation and engineering application of grouting in high ground temperature environment.

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“…R.A. Malek and A. Hattori [15,16] studied the long-term stability of polymer-modified mortars containing chloride ions, and the results show that polymer-modified mortars have a high resistance to chloride ion erosion, and their corrosion resistance is affected by their permeability. Tu Peng [17][18][19][20] prepared the cement slurry stone test blocks with different water-cement ratios and fly ash content, and studied the changes in the mechanical properties of the cement slurry stone body in a seawater environment. Many experts [21][22][23][24][25] also conducted research on the rheological mechanism and long-term stability of grouting and solids in subsea tunnels.…”

Section: Introductionmentioning

confidence: 99%

Damage Model and Experimental Study of a Sand Grouting-Reinforced Body in a Seawater Environment

Wang

Liu²,

Sun

et al. 2020

Water

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A water-rich sand layer is a common stratum in marine underground engineering. Grouting is a technology for soil or rock sealing, a method to solve the water seepage problem, and can be used to solve geological challenges in water-rich sand layers. A grouting-reinforced body deteriorates by the long-term erosion of seawater, resulting in attenuation of the performance of the solid. Obtaining the decay law of the performance of the grouting-reinforced body can guarantee the safe operation of the underground structure over a long life cycle. To this end, by describing the solid damage after seawater erosion, the stress–strain curve and the relationship between the damage variable and the internal micro-cracks and pores in the grouting-reinforced body were analyzed. Then, a constitutive model of the solid damage in the seawater environment was established. The stress–strain curve of added solid after deterioration was obtained by designing an indoor grouting reinforcement test and an accelerated deterioration test. Finally, the constitutive model of the sand layer plus solid deterioration in a seawater environment was determined. This research is of great importance for improving the deterioration theory under a seawater environment and ensuring the long term safety of tunnel operations.

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Grouting Mechanism of Cement-Based Slurry in a Concentric Annulus under High Groundwater Pressure

Cited by 5 publications

References 35 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

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

Damage Model and Experimental Study of a Sand Grouting-Reinforced Body in a Seawater Environment

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