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

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...

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

Images