Prediction method for lateral distribution of ordovician limestone karst crack water network

Abstract

The invention discloses a prediction method for lateral distribution of an ordovician limestone karst crack water network, which comprises the steps: firstly determining indexes closely related to distribution of the ordovician limestone karst crack water network, then collecting index original data at underground ordovician limestone hodrology drill holes with geophysical exploration, establishing a kernel main component model for the collected index original data, extracting new main components, then performing fuzzy standardizing, combining main component data subject to fuzzy standardizing and geophysical exploration ordovician limestone karst abnormal types into a sample set, and establishing a prediction model of a genetic algorithm optimization SVM; utilizing the well-established model to predict ordovician limestone karst abnormal region types at the underground ordovician limestone hodrology drill holes without geophysical exploration; finally drawing a distribution graph of the ordovician limestone karst abnormal region types, judging a distribution range of the ordovician limestone karst abnormal region types and analyzing a transfusion field direction of the ordovician limestone karst crack water network. The method is reliable in design principle, simple in prediction method, high in prediction precision and friendly in prediction environment.

Description

Technical field [0001] The invention relates to a prediction method for the lateral distribution of the Ordovician karst fissure water network, in particular to a prediction method for the lateral distribution of the Ordovician karst fissure water network in a North China coal field. Background technique [0002] Water inrush from the stope floor is a common problem in coal mine production. It has become a major issue related to the development of the energy industry. Because of the extremely complicated mechanism of the water inrush from the stope floor and the concealment of groundwater movement It is difficult to study because it cannot be directly observed. But as far as the occurrence conditions of groundwater are concerned, it has its own laws that can be studied qualitatively and quantitatively. The direct cause of the water inrush from the stope floor is the existence of a groundwater network below the floor. Without the existence of a groundwater network, a major water ...

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Problems solved by technology

The division of the water-rich degree of Austrian ash is mainly based on the "Regulations on Water Prevention and Control in Coal Mine" and the water inflow per unit of drilling (q) value. Theoretically, this division standard is scientific, but objectively only uses the q value to divide the water content The operability of the water-rich layer is poor, mainly because the q value is usually obtained in the well field exploration stage, and the quantity is extremely limited, followed by the long investment and time-consuming to obtain the q value; cores, but not every borehole will take cores and count the maximum leakage of flushing fluid; and with the expansion of mine mining area, the data of downhole Austrian ash hydrological drilling is becoming more and more abundant, and the data obtained from downhole hydrological drilling is the water inflow of the borehole, which can reflect the water-richness of the aquifer to a certain extent. The larger the water inflow value, the better the water-richness of the aquifer and the better the connectivity

On the other hand, geophysical detection has achieved good detection results in the detection of water-rich anomalies and water-bearing structures in aquifers, but not every austrian ash hydrological borehole has geophysical detection. Therefore, it is necessary to find a An accurate method, using the index values ​​and detection results obtained from hydrological boreholes with geophysical detection to predict karst anomalies in other areas without geophysical detection, providing a strong basis for the prevention and control of coal mine floor water inrush

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