A Study of Uniaxial Compressive Strength of Shale Based on Homogenization Method
| Autor: | Hansheng Geng, Zhun Bai, Liangliang Qi, Hongfa Xu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogeology Composite number 0211 other engineering and technologies Soil Science Geology 02 engineering and technology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Homogenization (chemistry) Diagenesis Pore water pressure Brittleness Compressive strength Architecture Composite material Oil shale 021101 geological & geomatics engineering 0105 earth and related environmental sciences |
| Zdroj: | Geotechnical and Geological Engineering. 37:5485-5497 |
| ISSN: | 1573-1529 0960-3182 |
| DOI: | 10.1007/s10706-019-00994-y |
| Popis: | Uniaxial compressive strength of shale is one of primary input parameters during shale gas development. In order to analyze uniaxial compression failure mechanism and obtain strength formula, the present study regards shale as heterogeneous material composed of pores, brittle minerals and clays. Pores are distributed as oblate ellipsoidal inclusion in clays, while brittle minerals are distributed as spheroidal inclusion in the equivalent clay matrix formed by pores and clays. With the help of the basic solution to Eshelby’s matrix–inclusion problem and the homogenization method, a two-step homogenization framework for shale was established. The influences of pore fluid on the rock mechanical behavior were also discussed by categories. Based on the composite mechanics, the failure strength of shale under uniaxial compression was deduced at last. The results show that the shale strength is affected by the mechanical properties of diagenetic minerals and enhanced with the increase of brittle mineral content. Since pore water promotes the initiation and propagation of cracks, shale strength decreases non-linearly with increasing water saturation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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