Multiphysics Lattice Discrete Particle Modeling (M-LDPM) for the Simulation of Shale Fracture Permeability

Li, Weixin; Zhou, Xinbo; Carey, J. William; Frash, Luke P.; Cusatis, Gianluca

doi:10.1007/s00603-018-1625-8

Cited by 35 publications

(14 citation statements)

References 70 publications

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“…rough the damage caused by the contact between particles, the morphological evolution and crack propagation evolution of the specimen can be accurately captured throughout the entire process, and the fracture mechanism of the medium can be deeply revealed. erefore, the particle flow method has gradually been applied to the study of basic mechanical properties and fracture characteristics of rock materials [21][22][23][24][25]. For example, the dynamic progressive fracturing process of the cracked chevron-notched Brazilian disc (CCNBD) specimen was numerically assessed via discrete-element method [26].…”

Section: Introductionmentioning

confidence: 99%

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

Wang

Cao

Sun

et al. 2021

Advances in Materials Science and Engineering

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Energy conversion and release occur through the entire deformation and failure process in jointed rock masses, and the accumulation and dissipation of rock mass energy in engineering can reveal the entire process of deformation and instability. This study uses PFC2D to carry out numerical simulation tests on single-joint sandstone under uniaxial compression and biaxial compression, respectively, and analyse the influence of joint inclination, length, and confining pressure on the meso-energy conversion process and phase evolution of jointed sandstone. Through analysis, it is found that the input meso total strain energy is transformed into meso dissipated energy and meso-elastic strain energy. Macroscopic and microscopic joint sandstone law is consistent with the overall energy evolution; and the difference is reflected in two aspects: (1) the microlevel energy evolution has no initial compaction energy consumption section and (2) the linear energy storage section before the macroenergy evolution peak can be subdivided into two sections in the meso-level energy evolution. Under uniaxial compression, the energy values at the characteristic points of the meso-level energy evolution phases first asymmetrically decrease and then increase with the increase of the joint inclination. The initiation point of jointed sandstone is significantly affected by the length of the joint, and the degradation effect of the meso-energy at the damage point and peak point weakens with the increase of the joint length. Comparing the data obtained from the PFC numerical simulation with the experimental data, it is found that the error is small, which shows the feasibility of the numerical model in this paper. Under biaxial compression, the accumulation rate of meso-elastic strain at the peak point of the jointed sandstone first decreases and then increases with the joint inclination angle. After the peak of jointed sandstone, the rate of sudden change of meso-energy change decreases with the increase of joint length. The conditions of high confining pressure will promote the meso-accumulated damage degree of the jointed sandstone before the peak, while inhibiting the meso-energy and the mutation degree of the damage after the peak. The higher the confining pressure, the more obvious the joint length and inclination effect characteristics of the elastic strain energy at the peak point of the jointed sandstone.

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Section: Introductionmentioning

confidence: 99%

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

Wang

Cao

Sun

et al. 2021

Advances in Materials Science and Engineering

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“…The developed LDPM models make it possible to reproduce the stress–strain curve of simulated concrete or rock, to analyze mesoscopic damage accumulation and crack initiation and development as well as to explicitly obtain dilatancy/compaction and changes in the porosity and permeability of the material under loading. Advanced LDPM implementations for mesoscopic modeling of the behavior of permeable brittle materials with interstitial fluid include several hybrid techniques [ 57 , 58 ] as well as coupled SPH-LDPM methods [ 59 ]. Hybrid techniques allow us to take into account the interconnected low-scale discontinuities, while coupled method makes it possible to explicitly investigate fluid flow through mesoscopic discontinuities.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Shilko

Konovalenko

2021

Materials

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It is well-known that the effect of interstitial fluid on the fracture pattern and strength of saturated high-strength concrete is determined by qualitatively different mechanisms at quasi-static and high strain rate loading. This paper shows that the intermediate range of strain rates (10−4 s−1 < ε˙ < 100 s−1) is also characterized by the presence of a peculiar mechanism of interstitial water effect on the concrete fracture and compressive strength. Using computer simulations, we have shown that such a mechanism is the competition of two oppositely directed processes: deformation of the pore space, which leads to an increase in pore pressure; and pore fluid flow. The balance of these processes can be effectively characterized by the Darcy number, which generalizes the notion of strain rate to fluid-saturated material. We have found that the dependence of the compressive strength of high-strength concrete on the Darcy number is a decreasing sigmoid function. The parameters of this function are determined by both low-scale (capillary) and large-scale (microscopic) pore subsystems in a concrete matrix. The capillary pore network determines the phenomenon of strain-rate sensitivity of fluid-saturated concrete and logistic form of the dependence of compressive strength on strain rate. Microporosity controls the actual boundary of the quasi-static loading regime for fluid-saturated samples and determines localized fracture patterns. The results of the study are relevant to the design of special-purpose concretes, as well as the assessment of the limits of safe impacts on concrete structural elements.

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“…Originally developed for concrete, this model was successfully used to simulate the behavior of plain concrete, 15,56–60 reinforced concrete, 61,62 fiber reinforced concrete, 63–67 and to reproduce multi‐physics phenomena such as aging, ASR, 68–72 as well as hygro‐thermal and chemical processes 73–76 . LDPM has also been used to simulate rocks 77,78 and masonry 79,80 …”

Section: Introductionmentioning

confidence: 99%

Symmetric high order microplane model for damage localization and size effect in quasi‐brittle materials

Lale

Cusatis

2021

Num Anal Meth Geomechanics

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This paper presents the so‐called symmetric high‐order microplane (SYHOM) model for the simulation of damage localization and size effect in quasi‐brittle materials. Contrarily to its predecessor, the high order microplane (HOM) model, SYHOM is formulated without rotational degrees of freedom, does not require couple stresses, and solves stability issues created by the antisymmetric components of stress and high order stress tensors. Furthermore, the formulation features variable, damage‐dependent localization limiter and nonlocal characteristic length that allows reproducing correctly size and shape of the fracture process zone during the entire softening process: from crack initiation to the formation of a stress‐free fracture. The paper highlights the implementation of SYHOM via isogeometric analysis with quadratic shape functions and presents several numerical simulations to demonstrate SYHOM's ability to simulate damage evolution during softening. Finally, SYHOM is validated by simulating experimental data relevant to the size effect on structural strength of notched concrete samples.

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Multiphysics Lattice Discrete Particle Modeling (M-LDPM) for the Simulation of Shale Fracture Permeability

Cited by 35 publications

References 70 publications

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

Study on the Meso‐Energy Damage Evolution Mechanism of Single‐Joint Sandstone under Uniaxial and Biaxial Compression

Nonlinear Mechanical Effect of Free Water on the Dynamic Compressive Strength and Fracture of High-Strength Concrete

Symmetric high order microplane model for damage localization and size effect in quasi‐brittle materials

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