Karst water layered judgment and underground water level observation method

Abstract

The invention discloses a karst water layered judgment and underground water level observation method. The method comprises the following steps of quantitatively monitoring the drilling fluid water return amount data at the beginning and the ending of each roundtrip meterage in an exploratory hole construction process according to a karst water layered position preliminarily judged by an underground water monitoring instrument; carrying out linear corrosion rate statistics on a rock core; obtaining the linear corrosion rate data per unit meter, drawing a linear corrosion rate change curve perunit meter, carrying out a pressurized-water test in a segmented manner, comparing a leakage data change curve per unit meter, a linear corrosion rate change curve per unit meter and a permeability data change curve per unit meter, and carrying out the preliminary analysis on the waveform change of each curve; when the curve waveform amplitude variation difference is too large, extracting the stratum water permeability change characteristics for karst water layer position layered judgment; and when the curve waveform common trend change is obvious, directly carrying out karst water aquifer layered judgment. According to the invention, the convenience of the karst water layered water level observation is improved.

Description

technical field [0001] The invention relates to the discrimination of karst water stratification and the observation of underground water level in the hydrogeological survey of the karst water distribution area, in particular to the discrimination of karst water stratification and the observation method of ground water level. Background technique [0002] Karst water occurs in the dissolved cracks and caves of soluble rock formations. Soluble rock formations (including carbonate rock, gypsum rock, calcareous conglomerate, etc.) are voids in the karst water-bearing medium, including diagenetic pores, dissolved pores, structural fissures, dissolved crevices, dissolved pipes, caves, and dissolved channels. Dissolution is not uniform in rock formations. As a kind of anisotropic heterogeneous medium, soluble rock formations have huge variations in permeability coefficient in different parts of the same aquifer. Therefore, there is no clear boundary between the karst aquifer and ...

AI Technical Summary

Problems solved by technology

At present, most of the observation methods for the water level of karst water layer follow the conventional water level observation method of phreatic-confined water layer, that is, to observe the water level of different aquifers, the main method is "plugging measures", and the non-target layer is used as the main method. After the anti-seepage material is blocked, the water level observation of the target layer is carried out. When the non-target layer is thick, a large amount of plugging materials are required. The construction process is complicated, and it requires a lot of manpower and time costs. Solidification also takes time

Moreover, if there are many stratified layers in the multi-layered aquifer, the plugging scheme and process will be very complicated

Therefore, the traditional method has high cost in layered water level observation, and the overall observation efficiency is low

At the same time, the layered water level observation method with "plugging measures" as the main means is irreversible, that is, once the plugging is implemented, it is impossible to restore the original state of the aquifer, which leads to a greater impact on the aquifer

The plugging plan requires a comprehensive and accurate understanding of the aquifer, and requires precise calculations and construction techniques to support it. If there is a deviation between the plugging plan and the construction process, it will cause the failure of layered water level observation, and the plugging materials The quality of the water stop effect will also affect the observation effect of the layered water level. Often there will be mixed water and unclear layered water, which will greatly disturb the aquifer and the effect of hydrological observation will be poor.

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