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Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit

A technology for confined aquifer and confined water, which is applied in infrastructure engineering, construction, etc., can solve the problems of reducing the depth of the confined water level and increasing the weight of the overlying aquifer on the confined aquifer.

Active Publication Date: 2017-01-18
苏州市轨道交通集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a dewatering method for increasing the anti-surge stability of foundation pits in pressurized water formations, aiming at the problem that the deep foundation pit’s confined water drawdown is often too large and easily induces environmental geotechnical engineering problems. , by deepening and extending the dewatering well into the semi-permeable layer above the confined aquifer, the water pressure is released, and it is considered as an aquitard after dewatering, thereby increasing the pressure of the aquitard above the confined aquifer The pressure is heavy, which reduces the depth of the confined water level, which is beneficial to the protection of the surrounding environment

Method used

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  • Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit
  • Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit
  • Dewatering method used for improving surging-resisting stability of confined water stratum foundation pit

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Embodiment Construction

[0055] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0056] Example:

[0057] The transfer section of a subway station is 285.2m long, 43.7m wide, and has an area of ​​about 12463.24m 2 , The maximum excavation depth of the foundation pit is about 25m, and the surrounding environment is complicated. The main envelope structure of the station adopts an 800mm / 1000mm thick underground continuous wall without blocking the confined aquifer, which is a suspended water-stop curtain. The profile of the foundation pit is as figure 1 Shown. The foundation pit is located in the floodplain area of ​​the Yangtze River in Nanjing. The site has a typical dual geological structure of the Yangtze River floodplain.

[0058] This embodiment provides a precipitation method for increasing the anti-surge stability of foundation pits in confined water formations. The method includes the following steps:

[0059] The first step is to obt...

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Abstract

The invention discloses a dewatering method used for improving the surging-resisting stability of a confined water stratum foundation pit. During dewatering designing, water pressure of the foundation pit is relieved by deepening and extending draining wells into a confined aquifer overlying acuitard, after being drained, the foundation pit is considered as a water-resisting layer, pressure weight of the confined aquifer overlying water-resisting layer is increased accordingly, the confined drawdown is reduced, and the surrounding environment can be protected. According to the dewatering method used for improving the surging-resisting stability of the confined water stratum foundation pit, the cover weight of the water-resisting layer is adjusted by relieving the micro pressure-bearing performance of the aquitard, the purposes of improving the surging-resisting stability of the foundation pit and reducing the confined water head are achieved, and the dewatering method has high application value.

Description

Technical field [0001] The invention belongs to the technical field of civil construction and traffic engineering, and specifically relates to a precipitation method for increasing the anti-surge stability of foundation pits in confined water strata. Background technique [0002] The urban areas along the rivers, lakes and seas are affected by the historical changes of the sedimentary environment. The stratum distribution is complex and changeable. The interbeds of clay / silty clay and silt silt sands contain one phreatic aquifer and multiple confined aquifers. The weakly permeable layer of cohesive soil over the aquifer mostly contains thin layers of silt and silt permeable interlayer, which are generally weakly pressure-bearing. In this kind of complex stratum, how to carry out decompression and dewatering design? It is very important to control the surge stability of the foundation pit and reduce the impact on the surrounding environment. [0003] Taking the typical dual geologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D19/10
CPCE02D19/10
Inventor 童立元王占生朱宁李文峰张明飞车鸿博潘皇宋
Owner 苏州市轨道交通集团有限公司
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