The compaction behavior and permeability evolution of broken rocks: Mechanical model and prediction

L. Fan, S. M. Liu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper proposed a conceptual model of broken rock mass compaction based on elastic theory by simplifying this compressing process and assuming the connection is a similar cubic mass without huge void space. With this simplification, the stress-strain constitutive law is established. The compacted rock mass permeability evolution was modeled based on the cubic law of porosity and permeability. The mechanical model was coupled into permeability evolution model. The predicted permeability evolution by coupled model is similar with reported experimental results. The modeled permeability results were indirectly validated using the weak sandstone input parameters. Compared to intact rock mass, we found that the stress-strain curve of compacted rock mass takes a longer stress-strain path to reach the linearity due to the void space compaction resulted from the friction slipping and re-arrangement of grains. It was also found that the grain elastic modulus does not contribute to the overall bulk compaction and permeability reduction at the initial compaction stage and it will control the permeability evolution only after the broken rock got fully compacted when it can be treated as intact rock mass. The proposed models will potentially lay foundation for the future permeability and caving behavior characterizations using numerical simulation for complex gob area.

Original languageEnglish (US)
Title of host publication50th US Rock Mechanics / Geomechanics Symposium 2016
PublisherAmerican Rock Mechanics Association (ARMA)
Pages1466-1476
Number of pages11
ISBN (Electronic)9781510828025
StatePublished - Jan 1 2016
Event50th US Rock Mechanics / Geomechanics Symposium 2016 - Houston, United States
Duration: Jun 26 2016Jun 29 2016

Publication series

Name50th US Rock Mechanics / Geomechanics Symposium 2016
Volume2

Other

Other50th US Rock Mechanics / Geomechanics Symposium 2016
CountryUnited States
CityHouston
Period6/26/166/29/16

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

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  • Cite this

    Fan, L., & Liu, S. M. (2016). The compaction behavior and permeability evolution of broken rocks: Mechanical model and prediction. In 50th US Rock Mechanics / Geomechanics Symposium 2016 (pp. 1466-1476). (50th US Rock Mechanics / Geomechanics Symposium 2016; Vol. 2). American Rock Mechanics Association (ARMA).