Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests
Roughness is one of the major characteristics of natural fracture in hydrocarbon and geothermal reservoirs, which has a significant influence on the activation of fractures during hydraulic stimulation. The main purpose of this study is to investigate the effect of different roughnesses and high nor...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2022/9745733 |
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| _version_ | 1849307411042533376 |
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| author | Yang Zhang Jinliang Song Dawei Hu Yuzhang Liu Fujian Zhou |
| author_facet | Yang Zhang Jinliang Song Dawei Hu Yuzhang Liu Fujian Zhou |
| author_sort | Yang Zhang |
| collection | DOAJ |
| description | Roughness is one of the major characteristics of natural fracture in hydrocarbon and geothermal reservoirs, which has a significant influence on the activation of fractures during hydraulic stimulation. The main purpose of this study is to investigate the effect of different roughnesses and high normal stresses on shear behaviors of rock joints. To do this, replicas of natural rock joint surfaces were constructed using the 3D optical scanning and 3D rigid engraving technique. Direct shear tests were performed on rock joint replicas with three joint roughness coefficient (JRC) indices (i.e., 1.42, 4.98, and 7.96) at two high normal load conditions (i.e., 15 and 30 MPa). The results show that the shear strength dependence on surface roughness is similar at normal stresses of 15 and 30 MPa. In addition, JRC-JCS shear strength criterion can reasonably describe the peak shear strengths that obtained from experimental curves, and the peak shear stresses have a positive correlation with JRC values at both normal stresses. Moreover, at normal stresses of 15 and 30 MPa, the shearing mechanism of joints with different JRC values is asperity shearing off. Results also show that the friction coefficient of joint surface increases as joint roughness increases, and higher normal loads may lead to a decrease of apparent cohesion, which weakens the residual strength during the slip. The results of this study improve insight into the natural fracture activation behavior during hydraulic fracturing. |
| format | Article |
| id | doaj-art-298b1f866cae4f9dbe746ff61dd86e1e |
| institution | Kabale University |
| issn | 1468-8123 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-298b1f866cae4f9dbe746ff61dd86e1e2025-08-20T03:54:47ZengWileyGeofluids1468-81232022-01-01202210.1155/2022/9745733Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing TestsYang Zhang0Jinliang Song1Dawei Hu2Yuzhang Liu3Fujian Zhou4China University of Petroleum-BeijingState Key Laboratory of Geomechanics and Geotechnical EngineeringState Key Laboratory of Geomechanics and Geotechnical EngineeringChina University of Petroleum-BeijingChina University of Petroleum-BeijingRoughness is one of the major characteristics of natural fracture in hydrocarbon and geothermal reservoirs, which has a significant influence on the activation of fractures during hydraulic stimulation. The main purpose of this study is to investigate the effect of different roughnesses and high normal stresses on shear behaviors of rock joints. To do this, replicas of natural rock joint surfaces were constructed using the 3D optical scanning and 3D rigid engraving technique. Direct shear tests were performed on rock joint replicas with three joint roughness coefficient (JRC) indices (i.e., 1.42, 4.98, and 7.96) at two high normal load conditions (i.e., 15 and 30 MPa). The results show that the shear strength dependence on surface roughness is similar at normal stresses of 15 and 30 MPa. In addition, JRC-JCS shear strength criterion can reasonably describe the peak shear strengths that obtained from experimental curves, and the peak shear stresses have a positive correlation with JRC values at both normal stresses. Moreover, at normal stresses of 15 and 30 MPa, the shearing mechanism of joints with different JRC values is asperity shearing off. Results also show that the friction coefficient of joint surface increases as joint roughness increases, and higher normal loads may lead to a decrease of apparent cohesion, which weakens the residual strength during the slip. The results of this study improve insight into the natural fracture activation behavior during hydraulic fracturing.http://dx.doi.org/10.1155/2022/9745733 |
| spellingShingle | Yang Zhang Jinliang Song Dawei Hu Yuzhang Liu Fujian Zhou Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests Geofluids |
| title | Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests |
| title_full | Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests |
| title_fullStr | Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests |
| title_full_unstemmed | Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests |
| title_short | Shearing Performance of Natural Joints with Different Roughnesses under Direct Shearing Tests |
| title_sort | shearing performance of natural joints with different roughnesses under direct shearing tests |
| url | http://dx.doi.org/10.1155/2022/9745733 |
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