Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface
For the problem that how the grouting reinforcement of a single penetrated structural plane affects the bearing capacity of surrounding rock, an approach of rock samples preparation with single penetrated fracture surface is proposed firstly, and the rock samples are injected with ultrafine cement a...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717
2022-12-01
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| Series: | Rock and Soil Mechanics |
| Subjects: | |
| Online Access: | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2022.5078 |
| _version_ | 1797855367058685952 |
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| author | ZHU Yong-jian REN Heng WANG Ping LI Peng WANG Xi-zhi WEI Ming-xing |
| author_facet | ZHU Yong-jian REN Heng WANG Ping LI Peng WANG Xi-zhi WEI Ming-xing |
| author_sort | ZHU Yong-jian |
| collection | DOAJ |
| description | For the problem that how the grouting reinforcement of a single penetrated structural plane affects the bearing capacity of surrounding rock, an approach of rock samples preparation with single penetrated fracture surface is proposed firstly, and the rock samples are injected with ultrafine cement and epoxy resin, respectively. Then, the strength and deformation characteristics of the consolidated body under uniaxial (triaxial) compression are investigated with the RMT-150C experimental system. Finally, the micro consolidation mechanism of structural plane grouting is revealed using theoretical analysis and electron microscope scanning. It is found that the fracture surface generated under the triaxial loading-unloading condition is closer to the engineering practice and meets the experimental requirements. The stress−strain characteristic curves of the specimens injected with ultrafine cement show phased deformation characteristics, and the curves of the specimens injected with epoxy resin are relatively smooth. For the strength characteristics, the influence of confining pressure is significantly larger than that of grouting material selection. Grouting reinforcement can improve the residual strength of rock mass. With the increase of confining pressure, the increase of improvement coefficient of residual strength is less obvious, and the peak strength of the consolidated body is closer to that of intact rock. For the failure characteristics, the main fracture surface of the specimen injected with ultrafine cement shears and slips along the original fracture surface, and the main fracture surface of the specimen injected with epoxy resin is a new penetrated fracture surface. Finally, based on the Mohr-Coulomb criterion, the relationship between the bonding force of grouting materials and the strength improvement coefficient of structural plane is established. It is found that the strength improvement coefficient of structural plane has a linear relationship with the bonding force of grout. The comparison between the calculation and test results shows that the formula is reasonable and can provide a reference for the optimization of deep surrounding rock support. |
| first_indexed | 2024-04-09T20:22:36Z |
| format | Article |
| id | doaj.art-e1b0b398e2e748a98a9408a905c5c4bb |
| institution | Directory Open Access Journal |
| issn | 1000-7598 |
| language | English |
| last_indexed | 2024-04-09T20:22:36Z |
| publishDate | 2022-12-01 |
| publisher | SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717 |
| record_format | Article |
| series | Rock and Soil Mechanics |
| spelling | doaj.art-e1b0b398e2e748a98a9408a905c5c4bb2023-03-30T23:23:29ZengSCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717Rock and Soil Mechanics1000-75982022-12-0143123221323010.16285/j.rsm.2022.5078Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface ZHU Yong-jianREN HengWANG PingLI PengWANG Xi-zhiWEI Ming-xing For the problem that how the grouting reinforcement of a single penetrated structural plane affects the bearing capacity of surrounding rock, an approach of rock samples preparation with single penetrated fracture surface is proposed firstly, and the rock samples are injected with ultrafine cement and epoxy resin, respectively. Then, the strength and deformation characteristics of the consolidated body under uniaxial (triaxial) compression are investigated with the RMT-150C experimental system. Finally, the micro consolidation mechanism of structural plane grouting is revealed using theoretical analysis and electron microscope scanning. It is found that the fracture surface generated under the triaxial loading-unloading condition is closer to the engineering practice and meets the experimental requirements. The stress−strain characteristic curves of the specimens injected with ultrafine cement show phased deformation characteristics, and the curves of the specimens injected with epoxy resin are relatively smooth. For the strength characteristics, the influence of confining pressure is significantly larger than that of grouting material selection. Grouting reinforcement can improve the residual strength of rock mass. With the increase of confining pressure, the increase of improvement coefficient of residual strength is less obvious, and the peak strength of the consolidated body is closer to that of intact rock. For the failure characteristics, the main fracture surface of the specimen injected with ultrafine cement shears and slips along the original fracture surface, and the main fracture surface of the specimen injected with epoxy resin is a new penetrated fracture surface. Finally, based on the Mohr-Coulomb criterion, the relationship between the bonding force of grouting materials and the strength improvement coefficient of structural plane is established. It is found that the strength improvement coefficient of structural plane has a linear relationship with the bonding force of grout. The comparison between the calculation and test results shows that the formula is reasonable and can provide a reference for the optimization of deep surrounding rock support. http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2022.5078structural planegrouting materialsstrengthfailure characteristicsreinforcement mechanism |
| spellingShingle | ZHU Yong-jian REN Heng WANG Ping LI Peng WANG Xi-zhi WEI Ming-xing Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface Rock and Soil Mechanics structural plane grouting materials strength failure characteristics reinforcement mechanism |
| title | Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| title_full | Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| title_fullStr | Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| title_full_unstemmed | Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| title_short | Grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| title_sort | grouting test and reinforcement mechanism analysis of rock with single penetrated fracture surface |
| topic | structural plane grouting materials strength failure characteristics reinforcement mechanism |
| url | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2022.5078 |
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