PDF
Full
Outline
In coastal area of China， there are many aquifers widely distributed in the soil layer， which need dewatering in the process of excavation construction. If it is easy for water to leak between different aquifers， and difficult to fully block the hydraulic connection between inside and outside the excavation， it will cause a large change of water level outside the excavation in the process of dewatering， leading to a series of environmental problems. Therefore， the deformation pattern and control method caused by the dewatering in multi-aquifer leaking excavation are worthy of further study. Based on the dewatering test results of the excavation of a subway station in Tianjin， this paper adopts the finite element method to study the influence of silt lens and leaking aquifers on the excavation deformation in the toe soil layer of the diaphragm wall induced by dewatering. Moreover， the mechanism of influence of silt lens on dewatering induced deformation and the comparative study of deformation induced by different dewatering schemes are also conducted. The results show that hydraulic connection between the upper and lower aquifers at the depth of the toe of the diaphragm wall can reduce the deformation of the diaphragm wall while increasing the settlement outside the excavation. The mechanism behind this is that the hydraulic connection reduces the pore pressure difference between the sides of the diaphragm wall， but increases the drawdown outside the excavation. In this case， it is recommended to adopt the “deep and shallow well” dewatering system with independent filters for the phreatic and confined aquifers， along with timely installation of horizontal supports. Dewatering should be implemented as needed to control the deformation induced by the dewatering process.
PDF
114
45
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
