Observation and Analysis of Deformation Control Performance of Hydraulic Servo Steel Support for a Soft Soil Pit—A Case Study of a Pit Project in Hangzhou
As foundation pit engineering is developing towards larger and deeper designs, the requirements for controlling excavation-induced deformation are becoming increasingly stringent, particularly in complex urban environments and soft soil areas. In recent years, numerous foundation pit projects have i...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/15/7/1002 |
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| Summary: | As foundation pit engineering is developing towards larger and deeper designs, the requirements for controlling excavation-induced deformation are becoming increasingly stringent, particularly in complex urban environments and soft soil areas. In recent years, numerous foundation pit projects have incorporated Hydraulic Servo Steel Support (HSSS) to actively manage the axial forces of the internal supports, which has achieved significant reductions in the displacement of the retaining structures (<i>δ</i><sub>D</sub>). An investigation of engineering cases in soft soil areas revealed that the average ratios of the <i>δ</i><sub>D</sub> to the excavation depth (<i>H</i>) for foundation pits with and without servo control systems were 0.11% and 0.38%, respectively. This study analyzed the monitoring data related to the <i>δ</i><sub>D</sub>, the deformation of the soil outside the foundation pit, and the changes in the axial force of the internal supports in a deep foundation pit located in Hangzhou City, China. The results indicated that employing the zoned excavation and HSSS effectively controlled the <i>δ</i><sub>D</sub>. During the excavation stage, the HSSS ensured that the <i>δ</i><sub>D</sub> remained below the design threshold, although some deformation persisted during the dismantling stage. Additionally, adjustments to the axial force of the internal supports affected the axial force of the adjacent supports, with a common occurrence of reverse pulling force in the first-layer supports due to the action of the HSSS. Therefore, further optimization of the HSSS is necessary to enhance control effectiveness. |
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| ISSN: | 2075-5309 |