Transparent soil test method for simulating groundwater seepage of drawdown and confined aquifer of foundation pit

Abstract

The invention relates to a transparent soil test method for simulating groundwater seepage of a drawdown and confined aquifer of a foundation pit. The method comprises the following steps: filling a model box with a transparent material in layers; installing a drawdown well pipe, sealing bearing plates and a tracer agent tube and connecting a pressure measuring plate; injecting a liquid into the model box to ensure that the supplemental water level is stable and fixed in the test process; starting the drawdown well pipe, continuously adjusting the pumping speed to reach the drawdown requirements; after the pumping speed is stable, releasing a tracer agent into the model box and shooting the flowing state of the tracer agent by a high-speed camera; and measuring pore-water pressure and change of different layers in the measurement test process by a pore-pressure measuring device. According to the transparent soil test method, the seepage path of the flow at the periphery of a waterproof curtain can be directly observed; related parameters of the seepage path law, the seepage speed and the like can be accurately analyzed through a picture shot by the high-speed camera; and the seepage law of the underground water in foundation pit rainfall is obtained by changing the insertion ratio of diaphragm walls, the length of a pumping filter pipe and the plane and section distances between different diaphragm walls and the filter pipe.

Description

technical field [0001] The invention belongs to the technical field of foundation pit dewatering engineering, in particular to a transparent soil test method for simulating groundwater seepage in a foundation pit dewatering confined aquifer. Background technique [0002] With the rapid development of my country's economy, urbanization has been carried out across the country. In order to meet the growing needs of citizens for basic functions such as travel, rail transit transfers, commerce, and parking, especially in dense urban centers where land use is increasingly tight , the development and utilization of underground space has become an irresistible trend. As an important part of underground engineering, foundation pit engineering is constantly expanding in scale, from small shallow foundation pits to ultra-deep and super-large areas. Especially in the most economically developed Yangtze River Delta region, due to the relatively high groundwater level, foundation pit prec...

AI Technical Summary

Problems solved by technology

The above-mentioned patents have invented a method of pumping and reducing pressure to improve the efficiency of dewatering, while this patent has invented a model test method for studying the working mechanism of curtains and well groups in deep foundation pit dewatering projects. The above-mentioned patents cannot be repeated many times And then get the mechanism

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