ES-PIM with Cell Death and Birth Technique for Simulating Heat Transfer in Concrete Dam Construction Process

Cheng, Jemmie; Liu, G. R.; Li, Tongchun; Wu, Shengchuan; Zhang, Gui-yong

doi:10.1061/(asce)em.1943-7889.0000312

Cited by 8 publications

(5 citation statements)

References 26 publications

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“…Different from the FEM solution, material properties are distinguished based on nodes instead of cells. For the nodes located at the interface of different materials, the smoothing domains are divided into different “boundary” sections based on the materials and the constitutive matrices are formed separately using the T3-scheme (Cheng et al , 2012).…”

Section: Briefing On Formulationsmentioning

confidence: 99%

“…The Duncan–Chang model (Duncan, 1970; Dong and Yu, 2013) is the widely accepted nonlinear elastic model and many elastic–plastic models, such as cam-clay model, modified cam-clay model (Rotisciani et al , 2016), PZ model (Pastor et al , 2010) and so on, have also been developed because the elastic–plastic theory was put forward. The Duncan–Chang model is applied widely in engineering practices (Wang et al , 2017; Cheng et al , 2012; Brooker and Ireland, 1965; Guo et al , 2016; Yu et al , 2017), as it can reflect the main deformation rules of rock-soil body and the model parameters can be obtained simply through the conventional triaxial shear test. On the other hand, the inversion analysis of the dam foundation should be carried out to get the calculation parameters of the deep overburden and learn further about its stress and deformation behaviors.…”

Section: Introductionmentioning

confidence: 99%

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The forward and inversion analysis of high rock-fill dam during construction period using the node-based smoothed point interpolation method

Pan

Cheng

2019

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Purpose The meshfree node-based smoothed point interpolation method (NS-PIM) is extended to the forward and inversion analysis of a high gravelly soil core rock-fill dam during construction periods. Design/methodology/approach As one member of the meshfree methods, the NS-PIM has the advantages of “softer” stiffness and adaptability to large deformations which is quite indispensable for the stability analysis of rock-fill dams. In this work, the present method contains a reconstruction procedure to deal with the existence or nonexistence of the construction layers. After verifying the validity of the NS-PIM method for nonlinear elastic model during construction period, the convergence features of the NS-PIM and FEM methods are further investigated with different mesh schemes. Furthermore, the NS-PIM and FEM methods are applied for the forward analysis of a high gravelly soil core rock-fill dam and the convergence features under complex stress conditions are also studied using the rock-fill dam model. Finally, the NS-PIM method is used to calculate the Duncan–Chang parameters of the deep overburden under the high gravelly soil core rock-fill dam based on the back-propagation neural network method. Findings The results show that: the NS-PIM solution for construction analysis still possesses the property of upper bound solution even under complex stress conditions and can provide comparatively more conservative results for safety evaluation. Furthermore, it can be used to evaluate the accuracy of results and mesh quality together with the FEM solution which has the property of lower bound solution; the inversion analysis in this work provides a set of material parameters for the deep overburden under high rock-fill dam during construction period and the calculated results show good agreement with the measured displacement values and it is feasible to apply the NS-PIM to the forward and inversion analysis of high rock-fill dams on deep overburden during construction periods. Research limitations/implications In further study, the feasibility of three-dimensional problems, elastic–plastic problems, contact problems and multipoint inversion can still be probed in the NS-PIM solution for the forward and inversion analysis of high rock-fill dams on deep overburden. Practical implications This paper introduced a method for the forward and inversion analysis of high rock-fill dams during construction period using the NS-PIM solution. The property of upper bound solution ensures that the NS-PIM can provide more conservative results for safety evaluation. The inversion analysis in this work provides a set of material parameters for the deep overburden under high rock-fill dam during construction periods. Originality/value First, the analysis from forward to inversion for high rock-fill dams during construction period using the NS-PIM solution is accomplished in this work. A procedure dealing with the existence or nonexistence of the construction layers is also developed for the construction analysis. Second, it is confirmed in this work that the NS-PIM still possesses the property of upper bound solution even under complex stress conditions (the forward analysis of high rock-fill dams during construction period). Thus, more conservative results can be provided for safety evaluation. Furthermore, it can be used to evaluate the accuracy of results and mesh quality together with the FEM solution which has the property of lower bound solution. Third, the calculated material parameters of the deep overburden in this work can be used for further studies of the high rock-fill dam.

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Section: Briefing On Formulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The forward and inversion analysis of high rock-fill dam during construction period using the node-based smoothed point interpolation method

Pan

Cheng

2019

Self Cite

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“…Far more than a simple temperature field problem with a single pipe, practical projects always involve dozens of pipes, a long‐lasting construction period, and complicated time‐dependent mechanical properties. However, this paper mainly deals with the temperature field because many other aspects such as construction process simulation, time‐dependent deformation, thermal stress calculation, and crack growth can be found easily in existing literatures such as .…”

Section: Applicationmentioning

confidence: 99%

A 3D discrete FEM iterative algorithm for solving the water pipe cooling problems of massive concrete structures

Cheng

Liu

et al. 2015

Num Anal Meth Geomechanics

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Water pipe cooling has been widely used for the temperature control and crack prevention of massive concrete structures such as high dams. Because both under-cooling and over-cooling may reduce the efficiency of crack prevention, or even lead to great harm to structures, we need an accurate and robust numerical tool for the prediction of cooling effect. Here, a 3D discrete FEM Iterative Algorithm is introduced, which can simulate the concrete temperature gradient near the pipes, as well as the water temperature rising along the pipes. On the basis of the heat balance between water and concrete, the whole temperature field of the problem can be computed exactly within a few iteration steps. Providing the pipe meshing tool for building the FE model, this algorithm can take account of the water pipe distribution, the variation of water flow, water temperature, and other factors, while the traditional equivalent algorithm based on semi-theoretical solutions can only solve problems with constant water flow and water temperature. The validation and convergence are proved by comparing the simulated results and analytical solutions of two standard second-stage cooling problems. Then, a practical concrete block with different cooling schemes is analyzed and the influences of cooling factors are investigated. In the end, detailed guidance for pipe system optimization is provided. temperature controlling, and block surface protection [3]. Among them, the water pipe cooling proves to be the most efficient and economic.Dating from the 1930s, the water pipe cooling technique was first used by the Bureau of Reclamation in Hoover Dam, of which the thin-walled metal pipes were embedded in the concrete block during construction period [1]. Since then, it spread over the world from common concrete to roller-compacted concrete (RCC), and from dams to sluices and other structures [4][5][6]. In the 1970s, a high-density polyethylene (HDPE) pipe with high thermal conductivity arose and soon took over metal pipe in hydraulic projects, such as Sayano-Shushenskaya Dam and Ertan Dam, because of its great flexibility for shaping [6]. Figure 1(a) shows the configuration of Jinping-I Arch Dam with 26 sections divided by temporary transverse joints. Each dam section was placed layer by layer at a vertical interval of 3 m. The cooling pipes were usually embedded in horizontal section planes like an S curve shown in Figure 1(b), with both vertical and horizontal pipe spacing of about 1.2-3.0 m. To keep the effectiveness, the pipe length should better not exceed 250 m. For those huge concrete structures like arch dams, which are first built by several parts and then joined together to meet their uneven deformations, the cooling process generally includes two stages. The firststage cooling begins several hours after the concrete placement, aiming to suppress the maximum concrete temperature rising. Before the joint grouting between neighboring parts, a second-stage cooling is carried out to make the inner temperature decrease till it gets near its...

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“…is the vector collects the derivatives of temperature and B temp is the temperature-gradient matrix (11.26) Performing the generalized gradient smoothing operation by using a proper set of the volume (area) of the smoothing domain [21][22][23][24], the "smoothed" temperature gradients within the smoothing domain k are obtained as follows [25][26][27][28][29] …”

Section: Generalized Gradient Smoothing Operationmentioning

confidence: 99%

S-PIM for Heat Transfer and Thermoelasticity Problems

Liu¹,

Zhang²

2013

Smoothed Point Interpolation Methods

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Heat transfer refers to the transition of thermal energy in media that can be solids or fluids. It is a very important physical phenomenon in most of the systems in engineering and science [1,2]. As one of the typical field problems with temperature as the field variable, the heat transfer problem is described by the second law of thermodynamics leading to a set of PDEs known as Helmholtz equations. It is one of the most fundamental topics in the analysis and design of mechanical, electrical, civil, biological and chemical systems. The Helmholtz equation is a rather a quite general PDEs that governs a number of other physical problems, including torsional deformation of bars, irrotational flow and acoustic problems. Therefore, the formulations and procedures presented in this chapter shall, in principle, applicable also these problems. In fact the S-FEM has been found particularly effective for acoustic problems [3][4][5][6][7][8][9].Compared to solid mechanics problems of vector fields of primary variables (displacements), the temperature field in heat transfer problems is scalar. In this sense, heat transfer problems are easier to deal with numerically. A large variety of numerical methods have been used to analyze the problems of heat transfer, such as the finite element method (FEM) [10-13], the finite difference method (FDM) [14,15] and types of meshfree methods [16][17][18][19].In this chapter, we provide a detailed formulation for the recent S-PIM models for general heat transfer and thermoelastic problems. First, we will give a brief description about the setting of general heat transfer problems. We will then present the field variable approximation, the gradient smoothing operation and the corresponding weakened weak (W 2 ) forms for S-PIM models. The Smoothed Point Interpolation Methods Downloaded from www.worldscientific.com by UNIVERSITY OF QUEENSLAND on 09/30/15. For personal use only.

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ES-PIM with Cell Death and Birth Technique for Simulating Heat Transfer in Concrete Dam Construction Process

Cited by 8 publications

References 26 publications

The forward and inversion analysis of high rock-fill dam during construction period using the node-based smoothed point interpolation method

The forward and inversion analysis of high rock-fill dam during construction period using the node-based smoothed point interpolation method

A 3D discrete FEM iterative algorithm for solving the water pipe cooling problems of massive concrete structures

S-PIM for Heat Transfer and Thermoelasticity Problems

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