A Rheological Model of Sandstones considering Response to Thermal Treatment
Time-dependent rheological response of geomaterials to thermal treatment is a crucial issue in geothermal energy utilization and deep mineral mining. This response, however, has not yet been fully considered in the existing rheological constitutive models for sandstones. In order to experimentally i...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
|
| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/2143748 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832567784593162240 |
|---|---|
| author | Xingang Wang Lei Huang Junrong Zhang |
| author_facet | Xingang Wang Lei Huang Junrong Zhang |
| author_sort | Xingang Wang |
| collection | DOAJ |
| description | Time-dependent rheological response of geomaterials to thermal treatment is a crucial issue in geothermal energy utilization and deep mineral mining. This response, however, has not yet been fully considered in the existing rheological constitutive models for sandstones. In order to experimentally investigate such responses and establish the associated rheological constitutive model, this study considers the sandstone specimens which have been thermally treated under different temperatures. The triaxial rheological test in conjunction with the scanning electron microscope is employed in the investigation to observe the mechanically and macro-/micromorphologically rheological response. Investigation results show that the thermal treatment induces microcracks and microdefects, and subsequently, they propagate during the creep. As a consequence, the heterogeneous deformation occurs, and macrocracks are present, leading to the irregular fluctuation and mutation in strain over time. A higher temperature contributes to a more severe structure damage and in turn reduces the intactness of sandstones and elevates the rheological response. The investigation allows successful establishment of a three-dimensional constitutive equation considering the instantaneous elastic response to thermal treatment. Based on the equation, a nonlinear visco-elastoplastic rheological constitutive model is developed for sandstones. Comparison with three existing rheological models shows that the model developed in this study could well represent the rheological process of the thermally treated sandstones. |
| format | Article |
| id | doaj-art-36276b8b925a442081d55677c810a6bd |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-36276b8b925a442081d55677c810a6bd2025-02-03T01:00:26ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/21437482143748A Rheological Model of Sandstones considering Response to Thermal TreatmentXingang Wang0Lei Huang1Junrong Zhang2Department of Geology, Northwest University, Xi’an, Shanxi 710069, ChinaThree Gorges Research Center for Geohazards, Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, ChinaDepartment of Engineering Geology and Geotechnical Engineering, Faculty of Engineering, China University of Geosciences, Wuhan, Hubei 430074, ChinaTime-dependent rheological response of geomaterials to thermal treatment is a crucial issue in geothermal energy utilization and deep mineral mining. This response, however, has not yet been fully considered in the existing rheological constitutive models for sandstones. In order to experimentally investigate such responses and establish the associated rheological constitutive model, this study considers the sandstone specimens which have been thermally treated under different temperatures. The triaxial rheological test in conjunction with the scanning electron microscope is employed in the investigation to observe the mechanically and macro-/micromorphologically rheological response. Investigation results show that the thermal treatment induces microcracks and microdefects, and subsequently, they propagate during the creep. As a consequence, the heterogeneous deformation occurs, and macrocracks are present, leading to the irregular fluctuation and mutation in strain over time. A higher temperature contributes to a more severe structure damage and in turn reduces the intactness of sandstones and elevates the rheological response. The investigation allows successful establishment of a three-dimensional constitutive equation considering the instantaneous elastic response to thermal treatment. Based on the equation, a nonlinear visco-elastoplastic rheological constitutive model is developed for sandstones. Comparison with three existing rheological models shows that the model developed in this study could well represent the rheological process of the thermally treated sandstones.http://dx.doi.org/10.1155/2019/2143748 |
| spellingShingle | Xingang Wang Lei Huang Junrong Zhang A Rheological Model of Sandstones considering Response to Thermal Treatment Advances in Civil Engineering |
| title | A Rheological Model of Sandstones considering Response to Thermal Treatment |
| title_full | A Rheological Model of Sandstones considering Response to Thermal Treatment |
| title_fullStr | A Rheological Model of Sandstones considering Response to Thermal Treatment |
| title_full_unstemmed | A Rheological Model of Sandstones considering Response to Thermal Treatment |
| title_short | A Rheological Model of Sandstones considering Response to Thermal Treatment |
| title_sort | rheological model of sandstones considering response to thermal treatment |
| url | http://dx.doi.org/10.1155/2019/2143748 |
| work_keys_str_mv | AT xingangwang arheologicalmodelofsandstonesconsideringresponsetothermaltreatment AT leihuang arheologicalmodelofsandstonesconsideringresponsetothermaltreatment AT junrongzhang arheologicalmodelofsandstonesconsideringresponsetothermaltreatment AT xingangwang rheologicalmodelofsandstonesconsideringresponsetothermaltreatment AT leihuang rheologicalmodelofsandstonesconsideringresponsetothermaltreatment AT junrongzhang rheologicalmodelofsandstonesconsideringresponsetothermaltreatment |