Unified Nonlinear Mechanic Studies of Rock Physics, Wave Propagation and Dynamic Faulting Mechanisms( I )

Project Details

Description

Base on cellular automata (CA) ealstodynamic modeling for nonlinear mechanics study, this proposal is seekingthe opportunity to explore the potentially important unified approach for tacking the subjects regarding (1) rockphysics, (2) nonlinear wave propagation, and (3) dynamic rupture evolutionary processes for variety of rock types.The main reason worth of exploring these subjects is that the proposed approach avoids the need to develop partialdifferential equations (PDEs) and complexity therein. Besides, solution obtained from PDEs may only provide itsmacroscopic behavior associate with aforementioned subjects. How the simulated microscopic features can benaturally linked to macroscopic observations? How to approach these subjects if one seeking the alternative butunified way which capable of providing reasonable and consistent micro- and macroscopic behavior? Is it possible?On the subject of rock physics, the proposed simulation scheme enable us to further understand, describe andconstruct petro-physical characteristics of “fractured porous media” under lattice scale. Base on the mathematicalmodels, fractured and porous media can be described separately in full but cannot be directly combined. Thecomplexity and computability of using CA lattice models are discrete, local with randomized arrangement andarbitrary lattice geometry through development of rules set appropriately for cells that exhibit self-organizecriticality (SOC). Distribution of the rock strength can also be rendered as homogeneous, arbitrary, or irregular(fractal) geometric distribution. The goal for the proposed simulation approach is to establish petro-physicalparameters for a fractured porous media.On the subject of nonlinear wave propagation, PI demonstrated that the successful and promising results can beachieved through initial investigation of pressure/sound propagating simulations using CA lattice gas (CA-LG) model.CA lattice-solid (CA-LS) model will be explored as well. Seismic waves are naturally generated through the vibration oflocal lattices where stress-strain relationship, viscosity combined with lattice defects can be defined. The mainpurpose is to completely describe, explore both micro- and megascopic features of nonlinear wave propagationphenomena for fractured porous media. How the elastic wave speed, dispersion, attenuation and scattering can bereact to rock types that are fractured with significant pore spaces containing gas and fluid inside? Can we observe theshock waves while rock is being deformed or break? How and why the wave speed changed after rock is beingdeformed or fractured? Those questions all need further exploration and seeking the explanation.Earthquake dynamics rupture processes involving strong/weak material heterogeneity, tectonic loading, stressaccumulation, concentration, and transfer, growing of rupture-front, expansion and creating nonlinear wavepropagation due to local vibration of lattice structure. The proposed approach simulates the physical earthquakerupture processes through iterative application of CA rules that encapsulate the essential physics of the system. Toimprove the analysis and understand the fault system dynamics and hopefully the predictability of real fault systems,CA-LS model is a viable approach. The effect of heterogeneity and non-linearity dynamics of rupture behavior ofearthquake can be thoroughly studied.In summary, PI proposing a research framework which using CA-LG and CA-LS models as a unified approach todescribe rock physic parameters and texture, study induced dynamic earthquake rupture mechanisms evolutionaryprocesses and understanding nonlinear wave propagation phenomena. Multi-scales studies of nonlinear evolutionaryfeatures covering stress loading and unloading, seismogenic, accumulation and failure processes can be done throughcomputation solid mechanism approach. The barrier between microscopic and macro- or megascopic features can belinked t
StatusFinished
Effective start/end date1/08/1731/12/18

UN Sustainable Development Goals

In 2015, UN member states agreed to 17 global Sustainable Development Goals (SDGs) to end poverty, protect the planet and ensure prosperity for all. This project contributes towards the following SDG(s):

  • SDG 11 - Sustainable Cities and Communities
  • SDG 15 - Life on Land
  • SDG 17 - Partnerships for the Goals

Keywords

  • Rock Physics
  • lattice solid
  • dynamic rupture
  • numerical modeling
  • nonlinear mechanics
  • wavepropagation

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