Three‐dimensional numerical analysis of concrete‐faced rockfill dam using dual‐mortar finite element method with mixed tangential contact constraints

Zhou, Mingchao; Zhang, Bingyin; Peng, Chong; Wu, Wei

doi:10.1002/nag.2524

Cited by 36 publications

(46 citation statements)

References 42 publications

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“…To minimize the cost and make more reasonable use of GNSS equipment, this paper proposes that TFEM is built by using the ANSYS software to predict the deformation of the Lijiaxia Dam. The Drucker-Prager criterion is adopted for numerical simulation analysis; according to the predicting displacement and the stress condition, the primary deformation area is determined [15][16][17][18]. In order to simplify the calculation, the structural materials are mainly divided into three categories: good rock mass, weak rock mass, and concrete.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

et al. 2018

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Higher monitoring cost is the main limiting factor in the application of geodetic receivers in dam deformation monitoring, as the number of receivers applied in one dam is always too large. In this paper, an improved GNSS monitoring scheme is proposed. Firstly, three-dimensional finite element model is built to simulate the main deformation part of the dam, and only one clocksynchronized dual-antenna receiver is used to set the reference and monitoring stations; then, the dam displacement warning standard is determined based on the relationship between the corresponding surface displacement and safety factor of the different mechanical parameter combination; finally, through BDS/GPS dam deformation monitoring system for Lijiaxia in China, the operating status of dam is evaluated. Through comparative analysis, it is found that the scheme is feasible.

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Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

et al. 2018

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“…The nonlinear contact behaviors are governed by the contact constraints, ie, contact constitutive law. Although the contact constraints between solids provide a good reference, the porous media contact constraints require further discussion for both the solid and fluid phases. These contact constraints are presented next as two individual subsections.…”

Section: Porous Media Dual Mortar Contact Methodsmentioning

confidence: 99%

“…In this work, we use a general transformation to condense the Lagrange multipliers and enforce the contact constraints at the porous media interface. Noting that the continuity of pore pressure in Equation is defined at all slave nodes, we must transform all the slave nodes, rather than only active slave nodes in the solid contact .…”

Section: Porous Media Dual Mortar Contact Methodsmentioning

confidence: 99%

“…The dual mortar approach is superior in its numerical efficiency. This approach was previously applied by the authors to three‐dimensional simulations of CFRDs, including a mechanical analysis, thermal‐mechanical analysis, and high‐performance computing …”

Section: Introductionmentioning

confidence: 99%

“…The continuity condition of the pore fluid pressure is enforced on the contact interface, which provides a general framework using the dual mortar approach to numerically analyze porous media contact problems and clay‐core rockfill dams. In Section , the mixed type of tangential contact constraints and soft joint contact algorithm are applied to treat the specific concrete‐concrete contact problems. These two methods were previously proposed to treat the solid/mechanical contact in CFRDs and are extended for use here with porous media contacts.…”

Section: Introductionmentioning

confidence: 99%

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A dual mortar contact method for porous media and its application to clay‐core rockfill dams

Wang

Zhou

Zhang

et al. 2019

Num Anal Meth Geomechanics

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Summary The clay‐core rockfill dam is a multibody contact system in which the hydromechanical response of the clay core plays a crucial role. This complex problem is highly challenging to model numerically. We present a numerical approach that considers the multibody contact, consolidation, and strong geometric and material nonlinearities for the modeling of clay‐core rockfill dams. Within the framework of the dual mortar finite element method, the presented approach considers the contact bodies as independent porous media continuums. The nonlinear contact conditions are derived based on the effective contact traction on contact interfaces and pore pressure continuity. The weak forms are obtained by introducing Lagrange multipliers as additional unknowns, which are then condensed through an extended general transformation. The presented method is first validated with a patch test considering the contact between two porous media. Then, a three‐dimensional analysis of the Rumei clay‐core rockfill dam is performed. The main numerical analysis concerns are the two observation galleries planned for construction inside the clay core. The galleries consist of dozens of tunnel‐like concrete blocks, giving rise to complex concrete‐concrete and concrete‐clay contacts. The discontinuous separation and sliding between concrete blocks are investigated. For the concrete‐concrete contact, both hard and soft joint approaches are evaluated and compared. The pore pressure results of the concrete structures are also analyzed.

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Numerical evaluation of soft inter‐slab joint in concrete‐faced rockfill dam with dual mortar finite element method

Zhou

Zhang

Peng³

2018

Num Anal Meth Geomechanics

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Recently constructed concrete-faced rockfill dams (CFRDs) often use soft inter-slab joints to prevent axial compression-induced extrusion damage in the concrete face. Due to the complexity of the multibody contact and the lack of information on the actual behavior of soft joints, it is highly challenging to numerically assess the effect of soft joints in CFRDs. In this paper, we present a numerical approach for the three-dimensional modeling of CFRDs with hard and soft joints. A dual mortar finite element method with Lagrange multiplier is developed to treat the multibody contact in hard joints with impenetrability condition. The soft joint slab-filler-slab contact system is modeled using an equivalent contact interface approach, where the soft contact constraints are imposed using a perturbed Lagrange formulation. Through a series of laboratory tests, the mechanical behavior of soft joint is investigated. An extrusion model for the soft joint is presented and implemented in the dual mortar finite element method. The proposed numerical method is applied to the three-dimensional analysis of Tianshengqiao-1 CFRD. Despite the complex multibody contact and strong material and geometry nonlinearities in the CFRD, the proposed method is stable and capable of capturing salient characteristics of the CFRD. Numerical results show that in Tianshengqiao-1, the employment of soft joints can effectively reduce the axial compression stress, thus greatly alleviating the risk of extrusion damage in the concrete face. KEYWORDS concrete-faced rockfill dam, contact analysis, dual mortar, perturbed lagrange formulation, soft joint INTRODUCTIONConcrete-faced rockfill dam (CFRD) is becoming increasingly popular in recent years. 1 It has several advantages, including, among others, high adaptability to a wide range of geological and hydrologic conditions, flexibility in construction materials, cost-effectiveness, and short construction time. [2][3][4] Presently, a number of huge CFRDs are under design, in construction or just finished, some of which have heights 4-6 over 250 m. Numerical analysis proves to be an applicable and imperative technique for CFRD design and safety assessment, because model tests are extremely difficult and expensive, and experience-based approaches might be unreliable in such unprecedented huge CFRDs.

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Three‐dimensional numerical analysis of concrete‐faced rockfill dam using dual‐mortar finite element method with mixed tangential contact constraints

Cited by 36 publications

References 42 publications

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

Evaluation and Analysis of Dam Operating Status Using One Clock-Synchronized Dual-Antenna Receiver

A dual mortar contact method for porous media and its application to clay‐core rockfill dams

Numerical evaluation of soft inter‐slab joint in concrete‐faced rockfill dam with dual mortar finite element method

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