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Fractures: Bone Repair

Fractures: Bone Repair

Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...

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A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

Published on: June 28, 2015

A 2.5D Reactive Transport Model for Fracture Alteration Simulation.

Hang Deng¹, Sergi Molins¹, Carl Steefel¹

¹Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.

Environmental Science & Technology

|July 1, 2016

Summary

A new reactive transport model predicts how fractures change due to geochemical reactions, crucial for understanding fluid flow and environmental challenges. The model accurately simulates altered layers and flow channel development in subsurface fractures.

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A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation

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Published on: June 28, 2015

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Fracture Apparatus Design and Protocol Optimization for Closed-stabilized Fractures in Rodents

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Published on: August 14, 2018

Area of Science:

Geochemistry
Hydrogeology
Geological Engineering

Background:

Geochemical reactions in subsurface fractures significantly impact fluid migration.
Predicting fracture alteration is vital for environmental management and resource exploration.
Existing models often lack detailed simulation of near-fracture altered layers and permeability heterogeneity.

Purpose of the Study:

To develop and validate a novel 2.5D continuum reactive transport model.
To predict the spatial patterns of fracture aperture change and altered layer development.
To incorporate permeability heterogeneity and diffusion limitations into fracture alteration modeling.

Main Methods:

Developed a 2.5D continuum reactive transport model.
Incorporated fracture plane permeability heterogeneity.
Updated fracture apertures and flow fields based on local geochemical reactions.
Tracked mineral reaction fronts and calculated altered layer thickness.
Accounted for diffusion limitations on reaction rates.

Main Results:

The model successfully predicts fracture aperture changes and altered layer formation.
Results align well with experimental data from CO2-acidified brine injection into Duperow Dolomite fractures.
The model captures the dissolution of calcite and dolomite, forming preferential flow channels.
Simulated diffusion limitations accurately reflect observed decreases in dissolution rates.

Conclusions:

The developed reactive transport model is effective for predicting fracture alteration processes.
The model provides insights into the formation of preferential flow paths and altered layers.
Accurate modeling of geochemical reactions and transport is essential for subsurface fluid flow prediction.