Water pumping communicating test method for drop-bottom-type water-stopping curtain

Abstract

The invention provides a water pumping communicating test method for a drop-bottom-type water-stopping curtain. The water pumping communicating test method is realized by the drop-bottom-type water-stopping curtain at the boundary of a foundation pit, the foundation pit and a plurality of test well sets, wherein each test well set is composed of a water pumping well in the foundation pit, and a plurality of observation wells arranged inside and outside the foundation pit correspondingly. According to the test method, an on-site water pumping communicating test is conducted at the earlier stage, the variation law of the water levels inside and outside the pit is monitored, and test data are collected; at the later stage of the test, by analyzing the variation law of the water levels of thetest wells inside and outside the foundation pit, the seepage isolating effect of the drop-bottom-type water-stopping curtain can be effectively evaluated, the influence on peripheral ground settlement after foundation pit dewatering is predicted, the strong basis is provided for later-stage dewatering optimal design, and the safety guarantee is provided for excavation construction of the foundation pit.

Description

technical field [0001] The invention relates to the field of foundation pit dewatering engineering, in particular to a pumping connection test method of a drop-bottomed water-stop curtain. Background technique [0002] With the continuous development of foundation pit engineering and the increasingly stringent requirements for the deformation control of the surrounding environment of the foundation pit, in recent years, the domestic method of using ultra-deep bottom-type water-stop curtains to cooperate with deep well points for dewatering has been widely used in deep foundation pit projects . The setting of the bottom-type water-stop curtain artificially increases the water-repellent boundary and changes the boundary conditions of the original seepage field. However, factors such as the construction quality of the water-stop curtain and the difficulty of controlling the seepage effect of the bottom-fall water-repellent layer, etc. This makes the groundwater seepage field m...

AI Technical Summary

Problems solved by technology

But in fact, due to the limitations of engineering technology and geological conditions, that is, the water-stop curtain often has defects, and there may also be certain cracks at the bottom relative to the aquifer (such as bedrock). The foundation pit is not isolated from the groundwater outside the foundation pit

If the water-stop curtain has defects due to construction and other reasons, and it is not discovered and remedied in time, the dewatering of the foundation pit will cause the excessive drop outside the pit, which will cause excessive ground settlement around the surrounding area and have a negative impact on the surrounding environment; in addition, when After the precipitation starts, under the action of the large water head difference inside and outside the foundation pit, the groundwater will flow into the pit from the outside of the pit with sediment carried by the defect of the side wall of the water-stop curtain, causing a great adverse effect on the safety of the project and the progress of the construction. leak phenomenon

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