Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation
Much geotechnical construction needs to be carried out under the condition of stepped excavation. However, there is still a lack of research on crack coalescence and failure modes of jointed rock mass under stepped excavation conditions. In order to simulate the stepped excavation test of the real p...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8884736 |
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| author | Yinzhu Liu Ping Cao Liwen He Qibin Lin |
| author_facet | Yinzhu Liu Ping Cao Liwen He Qibin Lin |
| author_sort | Yinzhu Liu |
| collection | DOAJ |
| description | Much geotechnical construction needs to be carried out under the condition of stepped excavation. However, there is still a lack of research on crack coalescence and failure modes of jointed rock mass under stepped excavation conditions. In order to simulate the stepped excavation test of the real project, the polylactic acid (PLA) material is selected as the filler for the excavation area. The stepped excavation tests are performed on sandstone specimens containing a preexisting joint under different normal load conditions. The dynamic stepped excavation of simulating excavate rock engineering is realised. The constant normal loads during the excavation process are determined to be 80 kN and 100 kN. The influence of the joint inclination on the failure characteristics of the excavation process is analysed. Four typical failure modes are summarised: (a) Mode I: crack coalescence of tensile failure; (b) Mode II: crack coalescence of mixed failure; (c) Mode III: without crack coalescence of mixed failure; (d) Mode IV: without crack coalescence of shear failure. Furthermore, the failure characteristics of the area above the excavation hole and the preexisting joint are analysed. The results show that there are three failure modes: (a) Type I: spalling failure; (b) Type II: shear slip failure; (c) Type III: shear slip and spalling mixed failure. |
| format | Article |
| id | doaj-art-feca8430384941c2b421796ab7ac5c31 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-feca8430384941c2b421796ab7ac5c312025-02-03T05:52:32ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88847368884736Failure Behaviour of Sandstone with a Preexisting Joint under Stepped ExcavationYinzhu Liu0Ping Cao1Liwen He2Qibin Lin3School of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaSchool of Resources and Safety Engineering, Central South University, Changsha 410083, ChinaMuch geotechnical construction needs to be carried out under the condition of stepped excavation. However, there is still a lack of research on crack coalescence and failure modes of jointed rock mass under stepped excavation conditions. In order to simulate the stepped excavation test of the real project, the polylactic acid (PLA) material is selected as the filler for the excavation area. The stepped excavation tests are performed on sandstone specimens containing a preexisting joint under different normal load conditions. The dynamic stepped excavation of simulating excavate rock engineering is realised. The constant normal loads during the excavation process are determined to be 80 kN and 100 kN. The influence of the joint inclination on the failure characteristics of the excavation process is analysed. Four typical failure modes are summarised: (a) Mode I: crack coalescence of tensile failure; (b) Mode II: crack coalescence of mixed failure; (c) Mode III: without crack coalescence of mixed failure; (d) Mode IV: without crack coalescence of shear failure. Furthermore, the failure characteristics of the area above the excavation hole and the preexisting joint are analysed. The results show that there are three failure modes: (a) Type I: spalling failure; (b) Type II: shear slip failure; (c) Type III: shear slip and spalling mixed failure.http://dx.doi.org/10.1155/2020/8884736 |
| spellingShingle | Yinzhu Liu Ping Cao Liwen He Qibin Lin Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation Advances in Civil Engineering |
| title | Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation |
| title_full | Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation |
| title_fullStr | Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation |
| title_full_unstemmed | Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation |
| title_short | Failure Behaviour of Sandstone with a Preexisting Joint under Stepped Excavation |
| title_sort | failure behaviour of sandstone with a preexisting joint under stepped excavation |
| url | http://dx.doi.org/10.1155/2020/8884736 |
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