Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Hao, Ji Ping; Jin, Caiyun; Li, Yue; Wang, Zigeng; Liu, Jianglin; Li, Hongwen

doi:10.1155/2021/3750589

Cited by 9 publications

(4 citation statements)

References 50 publications

(65 reference statements)

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“…Related scholars have launched a series of research into the rheological characteristics of concrete aggregate particles in the pumping process [7], such as rheological behavior analysis [8], pumping model construction [9], and pressure loss impact analysis [10]. In the pumping process, the concrete in the pumping pipe moves forward in the pump pipe under the action of pressure.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Modeling of the Pressure Loss in Concrete Pumping and Experimental Verification

Zhao,

Gao,

Wan

et al. 2024

Applied Sciences

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An accurate formula for calculating the pressure loss in concrete pumping plays a significant guiding role in the design and service process of pump trucks. Based on the flow characteristics of concrete pumping, a straight pipe one-dimensional model for the pressure loss is developed, in which both the viscous force of the mortar in the lubrication layer and the blocking effect of coarse aggregate particles are considered. First, the complex geometrical shapes of the aggregate particles are geometrically reconstructed by using a HandySCAN noncontact scanner and the reverse modeling software Geomagic Design X (v.19.0.2). Then, the equivalent spherical size of nonspherical aggregate particles is calculated according to the equal hydraulic radius principle. The blocking effect of the aggregate particles is converted into the wall roughness. Finally, an explicit expression for the pressure loss in concrete pumping is deduced by using Modi’s equation, Bernoulli’s equation, and Darcy’s formula, and the calculated value is compared with the measured value at a corresponding experimental site. The results indicate that the pressure loss values calculated with the one-dimensional flow model are closer to the actual pumping pressure loss values. The relative error between the results and the actual pumping pressure loss value is about 20.2%.

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Section: Introductionmentioning

confidence: 99%

One-Dimensional Modeling of the Pressure Loss in Concrete Pumping and Experimental Verification

Zhao,

Gao,

Wan

et al. 2024

Applied Sciences

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“…In this case, the pipe pressure loss and velocity distribution of the model are in good agreement with the actual pumping, and the main influence of the pipe pressure loss is the material properties of the lubricating layer. The second method is discrete element method (Lagrange) [9][10][11][12], in which concrete is dispersed into a large number of mortar units. The flow of concrete is equivalent to the flow of dense particles, and its flow properties are controlled by the normal and tangential forces between particles.…”

Section: Introductionmentioning

confidence: 99%

Research on Nonconstant and Discontinuous Pumping Characteristics of the Concrete Pump Truck

Ren

et al. 2023

Lubricants

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The nonconstant concrete flow due to the alternating pumping of the twin cylinder of the hydraulic pump will cause vibration of concrete pump trucks. Furthermore, the discontinuous pumping of concrete caused by inadequate suction and air doping will exacerbate the vibration. In order to study the effect of nonconstant and discontinuous pumping of concrete on the dynamic response and vibrational stability of the whole vehicle, multi-fluid pumping models with concrete-lubrication gas for straight and elbow pipes are established, respectively, and the boundary conditions of periodic pumping speed are taken into account to compare the rheological characteristics of concrete and the exciting force on the pipe wall under nonconstant pumping, discontinuous pumping and nonconstant discontinuous pumping conditions. Results show that the pipe pressure and the exciting force vary periodically with the pumping speed under nonconstant pumping conditions, and the peak-to-peak value of the pipe pressure and excitation for discontinuous pumping depend on the volume fraction and distribution state of the gas in the pipe.

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“…e flow behavior of aggregate in the pipe was studied by the discrete element method (DEM), and the influence of aggregate on the pumping performance of the concrete was analyzed by Zhan et al [15] and Hao et al [16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Rebound Rate of Wet Shotcrete Based on Experiment and Discrete Element Method

Zheng

2022

Shock and Vibration

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Wet shotcrete support is the main support method for underground engineering construction at present. The rebound rate is one of the indicators to evaluate the support effect, and a lower rebound rate will improve the construction effect of wet shotcrete. The concrete aggregates available in different regions of China have different particle sizes. To achieve better supporting effect, the discrete element method is used to simulate the spraying process of wet shotcrete. By constructing the nozzle structure and simplifying the concrete structure, the paper establishes the discrete element model of wet shotcrete. Using the above model, the paper analyzes the effects of injection distance and shrinkage angle on the injection rebound rate of concrete with three aggregate sizes of 5∼11 mm, 11∼17 mm, and 17∼25 mm. The optimal construction parameters of concrete with different aggregate particle size ratios were obtained through simulation experiments. The simulation results are highly consistent with the field experimental structure. It is feasible to simulate wet shotcrete spraying process by the discrete element method.

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Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Cited by 9 publications

References 50 publications

One-Dimensional Modeling of the Pressure Loss in Concrete Pumping and Experimental Verification

One-Dimensional Modeling of the Pressure Loss in Concrete Pumping and Experimental Verification

Research on Nonconstant and Discontinuous Pumping Characteristics of the Concrete Pump Truck

Analysis of Rebound Rate of Wet Shotcrete Based on Experiment and Discrete Element Method

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