Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling
The degradation of shear mechanical properties of rock fracture surfaces was determined after applying multiple dry-wet cycles. Artificially fractured feldspathic sandstone specimens were soaked in chemical solutions with pH values of 2, 7, and 12 for 3, 6, 9, 12, and 15 dry-wet cycles, followed by...
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.848440/full |
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| author | Baohua Guo Baohua Guo Baohua Guo Tan Cheng Jiehao Sun Shixuan Tian Yan Chen Yongbin Niu |
| author_facet | Baohua Guo Baohua Guo Baohua Guo Tan Cheng Jiehao Sun Shixuan Tian Yan Chen Yongbin Niu |
| author_sort | Baohua Guo |
| collection | DOAJ |
| description | The degradation of shear mechanical properties of rock fracture surfaces was determined after applying multiple dry-wet cycles. Artificially fractured feldspathic sandstone specimens were soaked in chemical solutions with pH values of 2, 7, and 12 for 3, 6, 9, 12, and 15 dry-wet cycles, followed by direct shear tests under normal stresses of 3, 6, 9, 12, and 15 MPa. The results showed that the pre-peak shear stiffness and peak shear strength of the fracture surfaces decreased, and the peak shear displacement increased progressively after cumulative dry-wet cycling treatments compared to the behavior of oven-dry rock fractures. Additionally, the pre-peak shear stiffness, peak shear strength, peak shear displacement, and residual shear strength decreased cumulatively as the number of dry-wet cycles increased. However, the chemistry of the wetting solution had little effect on mechanical behavior. Based on the Barton formula for describing the peak shear strength for rock fractures, an empirical formula for peak shear strength for irregular rock fractures under dry-wet cycling conditions is proposed by introducing a proportionality factor to describe the degree of deterioration of the rock fracture surface shear strength. The modified formula has a good fitting accuracy for the test shear strength data of sandstone fractures under dry-wet cycling conditions, which may assist in the practical estimation of the peak shear strength of rock fractures under dry-wet cycling conditions in engineering practice. |
| first_indexed | 2024-04-13T05:54:23Z |
| format | Article |
| id | doaj.art-ac3aeb331ec94563978491e2967152b8 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T05:54:23Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-ac3aeb331ec94563978491e2967152b82022-12-22T02:59:41ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-07-011010.3389/feart.2022.848440848440Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet CyclingBaohua Guo0Baohua Guo1Baohua Guo2Tan Cheng3Jiehao Sun4Shixuan Tian5Yan Chen6Yongbin Niu7School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaThe Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo, ChinaJiaozuo Engineering Research Center of Road Traffic and Transportation, Henan Polytechnic University, Jiaozuo, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaSchool of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaInstitute of Resources and Environment, Henan Polytechnic University, Jiaozuo, ChinaThe degradation of shear mechanical properties of rock fracture surfaces was determined after applying multiple dry-wet cycles. Artificially fractured feldspathic sandstone specimens were soaked in chemical solutions with pH values of 2, 7, and 12 for 3, 6, 9, 12, and 15 dry-wet cycles, followed by direct shear tests under normal stresses of 3, 6, 9, 12, and 15 MPa. The results showed that the pre-peak shear stiffness and peak shear strength of the fracture surfaces decreased, and the peak shear displacement increased progressively after cumulative dry-wet cycling treatments compared to the behavior of oven-dry rock fractures. Additionally, the pre-peak shear stiffness, peak shear strength, peak shear displacement, and residual shear strength decreased cumulatively as the number of dry-wet cycles increased. However, the chemistry of the wetting solution had little effect on mechanical behavior. Based on the Barton formula for describing the peak shear strength for rock fractures, an empirical formula for peak shear strength for irregular rock fractures under dry-wet cycling conditions is proposed by introducing a proportionality factor to describe the degree of deterioration of the rock fracture surface shear strength. The modified formula has a good fitting accuracy for the test shear strength data of sandstone fractures under dry-wet cycling conditions, which may assist in the practical estimation of the peak shear strength of rock fractures under dry-wet cycling conditions in engineering practice.https://www.frontiersin.org/articles/10.3389/feart.2022.848440/fullrock mechanicsrock fracturepeak shear strengthdry-wet cycledirect shear |
| spellingShingle | Baohua Guo Baohua Guo Baohua Guo Tan Cheng Jiehao Sun Shixuan Tian Yan Chen Yongbin Niu Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling Frontiers in Earth Science rock mechanics rock fracture peak shear strength dry-wet cycle direct shear |
| title | Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling |
| title_full | Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling |
| title_fullStr | Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling |
| title_full_unstemmed | Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling |
| title_short | Evolution of Peak Shear Strength of Rock Fractures Under Conditions of Repetitive Dry and Wet Cycling |
| title_sort | evolution of peak shear strength of rock fractures under conditions of repetitive dry and wet cycling |
| topic | rock mechanics rock fracture peak shear strength dry-wet cycle direct shear |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.848440/full |
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