A pumping connection test method for a bottom-type water-stop curtain

Abstract

The invention provides a test method for pumping and communicating with the bottom-type water-stop curtain, which is realized by the bottom-type water-stop curtain at the boundary of the foundation pit, the foundation pit and a plurality of test well groups, wherein each test well group consists of a The pumping well in the foundation pit and several observation wells inside and outside the foundation pit respectively. In the early stage of the test method, the on-site pumping connection test is carried out to monitor the change law of the water level inside and outside the pit, and collect test data; in the later stage of the test, through the analysis of the water level change law of the test well inside and outside the foundation pit, the performance of the bottom-type water-stop curtain can be effectively evaluated. Seepage isolation effect, predicting the impact of foundation pit dewatering on surrounding ground settlement, providing a strong basis for later dewatering optimization design, and providing safety guarantee for foundation pit excavation construction.

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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