Multi-wave stacking intermittent recharge construction method based on water level control

Abstract

The invention relates to a multi-wave stacking intermittent recharge construction method based on water level control. By the aid of the multi-wave stacking intermittent recharge construction method, recharge efficiency is effectively improved to the greatest extent on the premise that a recharge target is achieved. The method includes the specific steps: (1) determining relevant hydrogeology parameters of a precipitation recharge target stratum by means of field pumping tests; (2) inversing parameters of relevant strata by the aid of numerical simulation software and determining the parameters of the target stratum; (3) carrying out field recharge tests for single wells and group wells and numerical simulation, verifying a model, and simultaneously determining the optimal recharge mode, recharge frequency and single recharge time interval; (4) realizing numerical simulation of a recharge scheme and optimizing the recharge scheme; and (5) carrying out field recharge and simultaneously arranging a plurality of observation well according to needs. The relevant hydrogeology parameters include a permeation coefficient, a water storage coefficient and the like. A principle of the method is definite, the method is high in applicability, recharge efficiency can be improved under conditions of original recharge equipment by means of changing an original recharge construction method, simultaneously, recharge is controlled by means of observing recharge water level via the observation wells, dual purposes of controlling surface subsidence and guaranteeing pit safety are achieved to the greatest extent, and the working method is economical.

Description

technical field [0001] The invention belongs to the field of deep foundation pit dewatering mainly used in municipal engineering, industrial and civil construction projects, and in particular relates to a multi-wave superimposed intermittent recharge construction method based on water level control. Background technique [0002] At present, in the construction of more and more ultra-large and ultra-deep foundation pits, it is unavoidable to extract underground confined water for a long time during the excavation of the foundation pit. The long-term pumping of groundwater will have a strong disturbance to the surrounding geological environment, mainly manifested in: the ground around the foundation pit will subside, which will have a serious impact on the surrounding original buildings, underground pipelines, rail transit, etc. Therefore, in order to reduce the disturbance of the deep foundation pit dewatering project to the surrounding geological environment and reduce the a...

AI Technical Summary

Problems solved by technology

However, the existing groundwater recharge method has the following problems: In the foundation pit dewatering and recharge project, the single-wave long-term recharge method is generally used, which has problems such as low recharge efficiency, difficulty in reducing the water level in the pit, and safety of the foundation pit.

However, these patents have not considered the impact of the recharge method on the recharge efficiency

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