Measuring method and system for flow rate and direction of multi-borehole aquifer water flows

Abstract

The invention relates to a technical system for measuring hydrogeological parameters, in particular to a measuring method and system for the flow rate and direction of multi-borehole aquifer water flows. The measuring method comprises the following steps: arranging electrodes in multiple boreholes; supplying power to the electrode in one borehole; feeding an electrolyte into the borehole of the powered electrode, and recording feeding time; measuring electrode potential in the remaining boreholes and the potential measuring time; determining the flow rate and direction of the aquifer water flows. According to the technical scheme, a test system is arranged in the multiple boreholes with a charge method under the condition of multiple boreholes, and the flow rate and direction of deep-holegroundwater can be measured efficiently, quickly and accurately without radioactive pollution by means of equipotential point measurement.

Description

technical field [0001] The invention relates to a technical system for measuring hydrogeological parameters, in particular to a method and system for measuring the velocity and direction of water flow in multi-drilled aquifers. Background technique [0002] In engineering practice, many engineering projects need to construct multiple boreholes on the project site for hydrogeological and engineering geological parameter acquisition and measurement, so as to be able to more accurately evaluate the hydrogeological conditions during project construction. , construct a series of wellbore inspection holes; when the wellbore passes through the thick loose layer, it is necessary to use multiple outer freezing holes to freeze the formation, etc. During this period, it is necessary to master the parameters of the water flow rate and flow direction of the groundwater aquifer to effectively guide the wellbore grouting and other projects construction. [0003] The deep groundwater aquif...

AI Technical Summary

Problems solved by technology

[0006] The porous tracer test generally includes a source hole and several monitoring holes. The tracer is injected into the source hole, and the change of the tracer concentration is monitored in the monitoring hole. Due to the large number of holes, the test cost is high. Long test period;

[0007] The single-hole tracer test is a flow velocity and flow direction detection method based on the single-hole dilution theory. It is widely used in the current detection of groundwater flow velocity and direction. However, in the detection process, the probe needs to be located in the center of the borehole to accurately measure the flow velocity and flow direction. , and because there is a certain gap between the size of the probe and the size of the borehole, eccentricity will generally occur during the measurement process, resulting in measurement distortion

Moreover, in the existing detection devices, the probes of the device are generally larger to place the required modules. Due to the effect of the probes, the groundwater will be disturbed by the existence of the probes, thus causing errors in the detected results.

However, the aquifers in deep boreholes are generally buried deep, and related methods are not suitable for in-hole measurements.

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