Dewatering and recharging construction method of water-rich floury soil land layer

Abstract

The invention belongs to the technical field of engineering. A dewatering and recharging construction method of a water-rich floury soil land layer is provided so as to solve the problems that a systematic recharge theory is not provided for dewatering and recharging of the water-rich floury soil land layer, a recharge design and construction process standard is lacked, a recharge well is prone toblockage, the integration degree of pumping and filling equipment is low, and recharge and control of environment around a foundation pit can not be coordinated and the like. According to the dewatering and recharging construction method, a dewatering well is constructed in a foundation pit enclosure structure, then a recharging well is arranged on the outer side of the enclosure structure, a precipitation tank and a water collecting pit are arranged between the dewatering well and the recharging well, moreover, the dewatering well and the recharging well communicate with each other through apipeline, water in the dewatering well sequentially passes through the precipitation tank and the water collecting pit through the pipeline, and then is injected into a water injection pipe for recharging; the construction process sequentially comprises the steps of well completion construction of the recharging well, water injection pipeline arrangement, recharging operation and recharging wellbackfilling; it is effectively guaranteed that the effective engineering effect can be achieved on the basis of safe, rapid and low-cost excavation of a subway station deep foundation pit engineeringof the water-rich land layer, the construction difficulty is reduced, and the construction cost is saved.

Description

technical field [0001] The invention belongs to the technical field of engineering, and in particular relates to a construction method for dewatering and recharging water-rich powdery soil layers. Background technique [0002] In recent years, my country's subway engineering construction has developed rapidly. During the excavation process, the underground operating tunnels will pass through different geological and geographical environments. When the construction site is water-rich powder soil layer, if the conventional construction method is still adopted, it will cause adverse consequences such as foundation pit surge, deformation of the enclosure structure, and uneven settlement of surrounding buildings. Silt soil has good permeability and is a good channel for connection between diving and surface water. The hydraulic relationship between the two is close, and the capillary phenomenon of silt soil in the unsaturated state is active. The depth is shallow and the water v...

AI Technical Summary

Problems solved by technology

The construction technology of dewatering and recharging in the water-rich powdery soil layer of the existing deep foundation pit of subway stations is still not very mature, and the related research obviously lags behind the engineering practice. Irrigation design and construction process standards, easy blockage of recharge wells, low integration of pumping and irrigation equipment, inability to coordinate recharge and foundation pit surrounding environment control, etc.

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