Calculating method and automatic monitoring device for foundation pit permeability coefficient

Abstract

The invention discloses an automatic monitoring device for foundation pit permeability coefficient. The automatic monitoring device includes a water level gauge, a water pump, a water pipe, a water meter and a remote control device. The water level gauge is used for measuring pressure and water level of seepage water, and the water pump discharges the seepage water in a water level pipe through the water pipe. The water meter is connected with the water pump for measuring pump output. The remote control device includes an information acquisition module, a GPRS communication module and a remoteprocessing center. The information collection module collects pressure information and water quantity information and sends the pressure information and the water quantity information to the remote processing center through the GPRS communication module for remote processing. The remote processing center receives and processes the received information and obtains the water level and the permeability coefficient. A calculating method for the foundation pit permeability coefficient includes three-dimensional numerical modeling, pumping numerical experiments and actual monitoring and analysis. The least squares method is used to fit the relationship between the pump output, the permeability coefficient and the water pressure, and actual permeability coefficient can be obtained according to the actually-measured pump output and water pressure.

Description

technical field [0001] The invention relates to the field of engineering detection, in particular to a method and a device for detecting the water level and permeability coefficient of foundation pits. Background technique [0002] During engineering construction, if the groundwater level around the foundation pit is too high, it will not only deteriorate the construction conditions, cause the soil wall to collapse, but also affect the bearing capacity of the foundation, and even produce quicksand in severe cases. In addition, groundwater resources are more complex than surface water resources, so that the changes in the quality and quantity of groundwater itself, the environmental conditions that cause groundwater changes, and the migration laws of groundwater cannot be directly observed. It is very necessary to calculate such parameters in the field of geotechnical engineering monitoring technology. In the prior art, the method of monitoring the water level of the foundat...

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Problems solved by technology

In the prior art, the method of monitoring the water level of the foundation pit is mainly manual measurement, and there are very few cases of automatic monitoring of the water level of the foundation pit. As for the case of using automatic equipment to calculate the permeability coefficient of the surrounding soil, it has not been reported, resulting in the soil surface inside the surface. The relevant traits of the body cannot be accurately analyzed

The problem with the manual measurement method is that the construction site environment is complex, which will pose a certain threat to the safety of the surveyors, and the measurement process has to be interrupted when encountering special weather or time periods. In addition, the manual measurement method has large errors and cannot realize automatic measurement. monitoring, labor-intensive

[0003] At the same time, the permeability coefficient of the foundation pit is related to many factors such as the precipitation funnel and water head difference formed by the pumping process in the water level pipe. The permeability coefficient changes in real time with the pumping process, and it is impossible to calculate the foundation pit with simple expressions or formulas. permeability coefficient

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