Foundation pit anti-seepage and settlement control method based on stereoscopic curtain-well group system

Abstract

The invention provides a foundation pit anti-seepage and settlement control method based on a stereoscopic curtain-well group system. The system is composed of vertical curtains of unequal depths, a horizontal curtain grid and a precipitation well group in a foundation pit. The horizontal curtain grid structure is established based on traditional vertical curtains of unequal depths, and a limited water blocking body in an underground space is formed; by reasonably optimizing the well group structure, and the head loss during underground water movement is increased by sufficiently utilizing the curtain energy consumption theory, so that the purpose of decreasing the drawdown of underground water outside the foundation pit and accordingly decreasing the settlement amount is achieved. According to the stereoscopic curtain-well group system, the wall-well functional mechanism is utilized sufficiently, the problem of instability of the foundation pit caused by seepage can be effectively solved, and foundation pit dewatering is controlled so that ground settlement amount can be prevented; meanwhile, compared with horizontal totally-closed curtains, the project amount and project cost are greatly reduced, and great social benefits and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the fields of geotechnical engineering and geological engineering, and in particular relates to a foundation pit anti-seepage water and settlement control method based on a three-dimensional curtain-well group system. Background technique [0002] During the dewatering process of the foundation pit, when the vertical water-stop curtain cannot completely cut off the precipitation aquifer, the extraction of groundwater from the foundation pit will have a large-scale impact on the precipitation target aquifer, which will lead to the waste of groundwater resources, the disturbance of the original hydrogeological environment, and the nearby Land subsidence and other issues, while drainage may also have a large burden on municipal facilities. [0003] For foundation pits built in densely built areas, settlement needs to be controlled, and the methods that may be used are nothing more than isolation, lowering, and irrigation. However,...

AI Technical Summary

Problems solved by technology

When the recharge well is close to the foundation pit, the drawdown in the foundation pit may not meet the standard

At the same time, recharge will lead to multi-period soil disturbance, which may intensify settlement and uneven deformation

At present, fully enclosed curtains (vertical curtains + horizontal curtains) have been used in domestic foundation pits to control groundwater, but the project cost is high. When the required horizontal curtain depth is large, the construction is difficult and the quality is difficult to control.

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