Large Deformation Characteristics and Reinforcement Measures for a Rock Pillar in the Houziyan Underground Powerhouse
The underground powerhouse of the Houziyan Hydropower Station is under the conditions of high geo-stress and a low strength/stress ratio, which leads to significant rock deformation and failures, especially for rock pillars due to bidirectional unloading during the excavation process. Damages occurr...
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| Veröffentlicht in: | Rock mechanics and rock engineering 2018-02, Vol.51 (2), p.561-578 |
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| creator | Xiao, Xin-hong Xiao, Pei-wei Dai, Feng Li, Hai-bo Zhang, Xue-bin Zhou, Jia-wen |
| description | The underground powerhouse of the Houziyan Hydropower Station is under the conditions of high geo-stress and a low strength/stress ratio, which leads to significant rock deformation and failures, especially for rock pillars due to bidirectional unloading during the excavation process. Damages occurred in thinner rock pillars after excavation due to unloading and stress concentration, which will reduce the surrounding rock integrity and threaten the safety of the underground powerhouse. By using field investigations and multi-source monitoring data, the deformation and failure characteristics of a rock pillar are analyzed from the tempo-spatial distribution features. These results indicate that significant deformation occurred in the rock pillar when the powerhouse was excavated to the fourth layer, and the maximum displacement reached 107.57 mm, which occurred on the main transformer chamber upstream sidewall at an elevation of 1721.20 m. The rock deformation surrounding the rock pillar is closely related to the excavation process and has significant time-related characteristics. To control large deformation of the rock pillar, thru-anchor cables were used to reinforce the rock pillar to ensure the stability of the powerhouse. The rock deformation surrounding the rock pillar decreases gradually and forms a convergent trend after reinforcement measures are installed based on the analysis of the temporal characteristics and the rock pillar deformation rate. |
| doi_str_mv | 10.1007/s00603-017-1329-5 |
| format | Article |
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Damages occurred in thinner rock pillars after excavation due to unloading and stress concentration, which will reduce the surrounding rock integrity and threaten the safety of the underground powerhouse. By using field investigations and multi-source monitoring data, the deformation and failure characteristics of a rock pillar are analyzed from the tempo-spatial distribution features. These results indicate that significant deformation occurred in the rock pillar when the powerhouse was excavated to the fourth layer, and the maximum displacement reached 107.57 mm, which occurred on the main transformer chamber upstream sidewall at an elevation of 1721.20 m. The rock deformation surrounding the rock pillar is closely related to the excavation process and has significant time-related characteristics. To control large deformation of the rock pillar, thru-anchor cables were used to reinforce the rock pillar to ensure the stability of the powerhouse. The rock deformation surrounding the rock pillar decreases gradually and forms a convergent trend after reinforcement measures are installed based on the analysis of the temporal characteristics and the rock pillar deformation rate.</description><identifier>ISSN: 0723-2632</identifier><identifier>EISSN: 1434-453X</identifier><identifier>DOI: 10.1007/s00603-017-1329-5</identifier><language>eng</language><publisher>Vienna: Springer Vienna</publisher><subject>Anchors ; Cables ; Civil Engineering ; Deformation ; Dredging ; Earth and Environmental Science ; Earth Sciences ; Excavation ; Failure analysis ; Failures ; Field tests ; Geophysics/Geodesy ; Hydroelectric power ; Original Paper ; Rock deformation ; Rocks ; Spatial distribution ; Stability ; Stress concentration ; Stress ratio ; Unloading</subject><ispartof>Rock mechanics and rock engineering, 2018-02, Vol.51 (2), p.561-578</ispartof><rights>Springer-Verlag GmbH Austria 2017</rights><rights>Rock Mechanics and Rock Engineering is a copyright of Springer, (2017). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a378t-15c2602985b2fb293c7d8812274f4c522027e7a7d33df524c7e22a206d9491193</citedby><cites>FETCH-LOGICAL-a378t-15c2602985b2fb293c7d8812274f4c522027e7a7d33df524c7e22a206d9491193</cites><orcidid>0000-0002-6817-1071</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00603-017-1329-5$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00603-017-1329-5$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Xiao, Xin-hong</creatorcontrib><creatorcontrib>Xiao, Pei-wei</creatorcontrib><creatorcontrib>Dai, Feng</creatorcontrib><creatorcontrib>Li, Hai-bo</creatorcontrib><creatorcontrib>Zhang, Xue-bin</creatorcontrib><creatorcontrib>Zhou, Jia-wen</creatorcontrib><title>Large Deformation Characteristics and Reinforcement Measures for a Rock Pillar in the Houziyan Underground Powerhouse</title><title>Rock mechanics and rock engineering</title><addtitle>Rock Mech Rock Eng</addtitle><description>The underground powerhouse of the Houziyan Hydropower Station is under the conditions of high geo-stress and a low strength/stress ratio, which leads to significant rock deformation and failures, especially for rock pillars due to bidirectional unloading during the excavation process. Damages occurred in thinner rock pillars after excavation due to unloading and stress concentration, which will reduce the surrounding rock integrity and threaten the safety of the underground powerhouse. By using field investigations and multi-source monitoring data, the deformation and failure characteristics of a rock pillar are analyzed from the tempo-spatial distribution features. These results indicate that significant deformation occurred in the rock pillar when the powerhouse was excavated to the fourth layer, and the maximum displacement reached 107.57 mm, which occurred on the main transformer chamber upstream sidewall at an elevation of 1721.20 m. The rock deformation surrounding the rock pillar is closely related to the excavation process and has significant time-related characteristics. To control large deformation of the rock pillar, thru-anchor cables were used to reinforce the rock pillar to ensure the stability of the powerhouse. The rock deformation surrounding the rock pillar decreases gradually and forms a convergent trend after reinforcement measures are installed based on the analysis of the temporal characteristics and the rock pillar deformation rate.</description><subject>Anchors</subject><subject>Cables</subject><subject>Civil Engineering</subject><subject>Deformation</subject><subject>Dredging</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Excavation</subject><subject>Failure analysis</subject><subject>Failures</subject><subject>Field tests</subject><subject>Geophysics/Geodesy</subject><subject>Hydroelectric power</subject><subject>Original Paper</subject><subject>Rock deformation</subject><subject>Rocks</subject><subject>Spatial distribution</subject><subject>Stability</subject><subject>Stress concentration</subject><subject>Stress ratio</subject><subject>Unloading</subject><issn>0723-2632</issn><issn>1434-453X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNp1kE1LAzEQhoMoWKs_wFvA82oy2d3sHqV-VKhYigVvIc3OtqltoskuUn-9KRU8eQpMnved4SHkkrNrzpi8iYyVTGSMy4wLqLPiiAx4LvIsL8TbMRkwCSKDUsApOYtxzVj6lNWA9BMdlkjvsPVhqzvrHR2tdNCmw2BjZ02k2jV0htYlwuAWXUefUcc-YKRpRDWdefNOp3az0YFaR7sV0rHvv-1OOzp3DYZl8H0qmfovDCvfRzwnJ63eRLz4fYdk_nD_Ohpnk5fHp9HtJNPpuC7jhYGSQV0VC2gXUAsjm6riADJvc1MAMJAotWyEaNoCciMRQAMrmzqvOa_FkFwdej-C_-wxdmrt--DSSgXJmqwrqPJE8QNlgo8xYKs-gt3qsFOcqb1ddbCrkl21t6uKlIFDJibWLTH8Nf8f-gG4nH0O</recordid><startdate>20180201</startdate><enddate>20180201</enddate><creator>Xiao, Xin-hong</creator><creator>Xiao, Pei-wei</creator><creator>Dai, Feng</creator><creator>Li, Hai-bo</creator><creator>Zhang, Xue-bin</creator><creator>Zhou, Jia-wen</creator><general>Springer Vienna</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TN</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>M2P</scope><scope>M7S</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope><orcidid>https://orcid.org/0000-0002-6817-1071</orcidid></search><sort><creationdate>20180201</creationdate><title>Large Deformation Characteristics and Reinforcement Measures for a Rock Pillar in the Houziyan Underground Powerhouse</title><author>Xiao, Xin-hong ; 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Damages occurred in thinner rock pillars after excavation due to unloading and stress concentration, which will reduce the surrounding rock integrity and threaten the safety of the underground powerhouse. By using field investigations and multi-source monitoring data, the deformation and failure characteristics of a rock pillar are analyzed from the tempo-spatial distribution features. These results indicate that significant deformation occurred in the rock pillar when the powerhouse was excavated to the fourth layer, and the maximum displacement reached 107.57 mm, which occurred on the main transformer chamber upstream sidewall at an elevation of 1721.20 m. The rock deformation surrounding the rock pillar is closely related to the excavation process and has significant time-related characteristics. To control large deformation of the rock pillar, thru-anchor cables were used to reinforce the rock pillar to ensure the stability of the powerhouse. The rock deformation surrounding the rock pillar decreases gradually and forms a convergent trend after reinforcement measures are installed based on the analysis of the temporal characteristics and the rock pillar deformation rate.</abstract><cop>Vienna</cop><pub>Springer Vienna</pub><doi>10.1007/s00603-017-1329-5</doi><tpages>18</tpages><orcidid>https://orcid.org/0000-0002-6817-1071</orcidid></addata></record> |
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| subjects | Anchors Cables Civil Engineering Deformation Dredging Earth and Environmental Science Earth Sciences Excavation Failure analysis Failures Field tests Geophysics/Geodesy Hydroelectric power Original Paper Rock deformation Rocks Spatial distribution Stability Stress concentration Stress ratio Unloading |
| title | Large Deformation Characteristics and Reinforcement Measures for a Rock Pillar in the Houziyan Underground Powerhouse |
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