Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand
This paper presents a case study of deep excavation adjacent to an existing bridge in karst region of Guangzhou city, China. The movements of retaining structures, settlements of surrounding ground and pipelines, and the responses of bridge piles were measured and evaluated. A sudden surge of ground...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-02-01
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| Series: | Underground Space |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967422000629 |
| _version_ | 1827832488383217664 |
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| author | Yubing Yang Caiyuan Chen Chao Liu Longtian Huang Wei Chen Nengyou Lin Jie Cui Wandong Xie |
| author_facet | Yubing Yang Caiyuan Chen Chao Liu Longtian Huang Wei Chen Nengyou Lin Jie Cui Wandong Xie |
| author_sort | Yubing Yang |
| collection | DOAJ |
| description | This paper presents a case study of deep excavation adjacent to an existing bridge in karst region of Guangzhou city, China. The movements of retaining structures, settlements of surrounding ground and pipelines, and the responses of bridge piles were measured and evaluated. A sudden surge of groundwater was recorded at the north pit when excavated halfway. Soil-cement columns using the Metro Jet System (MJS) method was employed along the outer perimeters of the diaphragm wall where water inflow occurred, for the sake of blocking the flow channels. The measured maximum wall deflection δhm in this case ranged from 0.13 %H to 0.3 %H, with a mean value of 0.2 %H (H is the excavation depth), which agreed well with the empirical prediction in mixed ground. During the MJS treatment, the wall and surrounding soils experienced notable lateral deflection and settlement. The bridge piles experienced significant settlement since the excavation commenced, which might be attributed to the inherent deficiency in geological condition and pile length. The soil disturbance induced by the adjacent deep excavation accelerated bridge settlement. The finite element analysis revealed that the excessive settlement of the bridge piles and ground surface resulted from confined-water withdrawal in sand layers. |
| first_indexed | 2024-03-12T05:12:01Z |
| format | Article |
| id | doaj.art-cc52ecb338f84ce5b4e5c67d423608c7 |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-12T05:12:01Z |
| publishDate | 2023-02-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-cc52ecb338f84ce5b4e5c67d423608c72023-09-03T08:28:05ZengKeAi Communications Co., Ltd.Underground Space2467-96742023-02-0184560Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sandYubing Yang0Caiyuan Chen1Chao Liu2Longtian Huang3Wei Chen4Nengyou Lin5Jie Cui6Wandong Xie7College of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, PR ChinaCollege of Water Conservancy and Civil Engineering, South China Agricultural University, Guangzhou 510642, PR ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, PR China; Corresponding authors.Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, PR China; Corresponding authors.Architectural Design and Research Institute of Guangdong Province, Guangzhou 510010, PR ChinaArchitectural Design and Research Institute of Guangdong Province, Guangzhou 510010, PR ChinaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, PR ChinaCCCC – FHDI Engineering Co., Ltd, Guangzhou 510290, PR ChinaThis paper presents a case study of deep excavation adjacent to an existing bridge in karst region of Guangzhou city, China. The movements of retaining structures, settlements of surrounding ground and pipelines, and the responses of bridge piles were measured and evaluated. A sudden surge of groundwater was recorded at the north pit when excavated halfway. Soil-cement columns using the Metro Jet System (MJS) method was employed along the outer perimeters of the diaphragm wall where water inflow occurred, for the sake of blocking the flow channels. The measured maximum wall deflection δhm in this case ranged from 0.13 %H to 0.3 %H, with a mean value of 0.2 %H (H is the excavation depth), which agreed well with the empirical prediction in mixed ground. During the MJS treatment, the wall and surrounding soils experienced notable lateral deflection and settlement. The bridge piles experienced significant settlement since the excavation commenced, which might be attributed to the inherent deficiency in geological condition and pile length. The soil disturbance induced by the adjacent deep excavation accelerated bridge settlement. The finite element analysis revealed that the excessive settlement of the bridge piles and ground surface resulted from confined-water withdrawal in sand layers.http://www.sciencedirect.com/science/article/pii/S2467967422000629Deep excavationMJS treatmentPile-foundationKarst regionConfined-water |
| spellingShingle | Yubing Yang Caiyuan Chen Chao Liu Longtian Huang Wei Chen Nengyou Lin Jie Cui Wandong Xie Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand Underground Space Deep excavation MJS treatment Pile-foundation Karst region Confined-water |
| title | Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand |
| title_full | Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand |
| title_fullStr | Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand |
| title_full_unstemmed | Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand |
| title_short | Performance of a deep excavation and the influence on adjacent piles: A case history in karst region covered by clay and sand |
| title_sort | performance of a deep excavation and the influence on adjacent piles a case history in karst region covered by clay and sand |
| topic | Deep excavation MJS treatment Pile-foundation Karst region Confined-water |
| url | http://www.sciencedirect.com/science/article/pii/S2467967422000629 |
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