Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation
The excavation unloading of deep foundation pits in soft soil areas often produces negative excess pore water pressure. The rebound deformation of soil on the excavation surface of the foundation pit can be predicted reliably through the accurate expression of relevant variation laws. In combination...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/9478725 |
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| author | Qizhi Hu Qiang Zou Zhigang Ding Zhaodong Xu |
| author_facet | Qizhi Hu Qiang Zou Zhigang Ding Zhaodong Xu |
| author_sort | Qizhi Hu |
| collection | DOAJ |
| description | The excavation unloading of deep foundation pits in soft soil areas often produces negative excess pore water pressure. The rebound deformation of soil on the excavation surface of the foundation pit can be predicted reliably through the accurate expression of relevant variation laws. In combination with the principle of effective stress and the general equation of unidirectional seepage consolidation, an equation for calculating the rebound deformation from the bottom in the process of foundation pit excavation unloading was obtained. Additionally, a triaxial unloading test was adopted to simulate the excavation unloading processes for actual foundation pit engineering. After studying the variation law of the excess pore water pressure generated by excavation unloading, it was found that the negative excess pore water pressure increased with increasing unloading rate, while the corresponding peak value decreased with increasing confining pressure. The equation for rebound calculation was verified through a comparison with relevant measured data from actual engineering. Therefore, it is considered that the equation can reliably describe the rebound deformation law of the base. This paper aims to guide the design and construction of deep foundation pits in soft soil areas. |
| format | Article |
| id | doaj-art-dfd07993942e4fa28bc33d9264ade61a |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-dfd07993942e4fa28bc33d9264ade61a2025-02-03T05:52:25ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422020-01-01202010.1155/2020/94787259478725Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for ExcavationQizhi Hu0Qiang Zou1Zhigang Ding2Zhaodong Xu3College of Civil Construction and Environment, Hubei University of Technology, Wuhan 430068, ChinaCollege of Civil Construction and Environment, Hubei University of Technology, Wuhan 430068, ChinaChina Communication Road & Bridge South Engineering Co.,, Ltd., Beijing 100027, ChinaChina Communication Road & Bridge South Engineering Co.,, Ltd., Beijing 100027, ChinaThe excavation unloading of deep foundation pits in soft soil areas often produces negative excess pore water pressure. The rebound deformation of soil on the excavation surface of the foundation pit can be predicted reliably through the accurate expression of relevant variation laws. In combination with the principle of effective stress and the general equation of unidirectional seepage consolidation, an equation for calculating the rebound deformation from the bottom in the process of foundation pit excavation unloading was obtained. Additionally, a triaxial unloading test was adopted to simulate the excavation unloading processes for actual foundation pit engineering. After studying the variation law of the excess pore water pressure generated by excavation unloading, it was found that the negative excess pore water pressure increased with increasing unloading rate, while the corresponding peak value decreased with increasing confining pressure. The equation for rebound calculation was verified through a comparison with relevant measured data from actual engineering. Therefore, it is considered that the equation can reliably describe the rebound deformation law of the base. This paper aims to guide the design and construction of deep foundation pits in soft soil areas.http://dx.doi.org/10.1155/2020/9478725 |
| spellingShingle | Qizhi Hu Qiang Zou Zhigang Ding Zhaodong Xu Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation Advances in Materials Science and Engineering |
| title | Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation |
| title_full | Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation |
| title_fullStr | Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation |
| title_full_unstemmed | Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation |
| title_short | Experimental Study on the Variation Law of Excess Pore Water Pressure at the Bottom of the Foundation Pit for Excavation |
| title_sort | experimental study on the variation law of excess pore water pressure at the bottom of the foundation pit for excavation |
| url | http://dx.doi.org/10.1155/2020/9478725 |
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