1 pumping design technical parameters calculation pumping test design technical parameters in addition to pumping hole duct immersion ratio, there are pumping hole air unit consumption, pumping wind pressure, outlet pipe diameter, engine power and so on.
The calculation of the air duct immersion ratio of the air duct immersion ratio is the ratio of the immersion depth of the air duct head mixer below the moving water level to the rising height of the water gas mixture leaving the air duct head mixer.
12 Calculation of air unit consumption The air unit consumption refers to the volume of compressed air (m3) required for pumping 1 m3 of water per pumping operation.
13 Calculation of pumping wind pressure The wind pressure required to start pumping is called the starting wind pressure (P0).
14 Calculate the diameter of the outlet pipe The diameter of the outlet pipe indicates the outlet pipe diameter (d) under the independent installation of the water pipe and the air duct.
15 Engine Power Calculation The engine provides the power source for the air compressor, and the power equipment must have certain power requirements.
2 pumping design technical parameters analysis from the above including duct immersion ratio, air unit consumption (V), starting wind pressure (P0), working wind pressure (Pn), outlet pipe diameter (d), engine power (N)
It can be seen from the calculation methods of the six technical parameters that the calculation of these technical parameters requires a predetermined set of flow rate and depth reduction values, that is, designing the dynamic water level and designing the water output. The designed water quantity should be given the technical design reference value by the mining area investigation and collecting the historical data of the adjacent area. The design dynamic water level should be designed according to the single well steady flow pumping test requirement by 5~10m.
It can be seen from equation (1) that given a design water level, a duct immersion depth is given, and a design duct immersion ratio can be calculated from equation (1).
The design air unit consumption (V) can be calculated from the design water quantity reference value from (2), and the air volume Q0 in the water-gas mixture is V times the designed water quantity.
Then: the water-gas mixture Q+Q0=vd2 /4 per unit time can be used to formulate the water pipe diameter (d) from (4); also the design water level from (3-1), (3-2) The air pressure (P0) and the working air pressure (Pn) of the air compressor can be given. The pumping air pressure is calculated by atmospheric pressure, and the standard atmospheric pressure is equivalent to the pressure generated by the 103333 m water column, that is, about 10 m water column pressure.
The water column rise height h can be given by a given design water level reference value to calculate the required engine power (N) from equation (5).
N (horsepower) = Qh / (75) = Vv / (75), the symbol in the above formula represents the same meaning as before, and the obtained value indicates that the engine completes a flow volume of 1 to 9 m/s. The least amount of work to do.
3 pumping air duct immersion than the design technical parameters hydrogeological significance of the immersion depth of the duct, the greater the duct immersion ratio, considering the rated wind pressure of the air compressor, with the start of pumping, the moving water level decreases, the immersion depth is small, The immersion ratio becomes smaller, that is, as the pumping continues, the water level deepens and the duct immersion ratio gradually becomes larger and smaller, and it can be seen from the above (2), (3-1), (3-2), The deeper the air duct is immersed, the larger the immersion ratio is, the smaller the air unit consumption is. The same outlet water pipe will increase the water output, but the required wind pressure will increase. On the contrary, the shallower the air duct immersion, the smaller the immersion ratio, the required wind. The pressure is small, but the air unit consumption is large (see Table 1). The same outlet pipe, the water output is relatively reduced, so too small air duct immersion will make the pumping water appear discontinuous or even not water, usually the duct is submerged. The ratio should not be less than 05~06. According to the ratio of air duct immersion depth to water column rise height (H/h), generally should be less than 08~12, preferably up to 15, the duct immersion ratio is 06, so the general requirements Actual duct mixer immersion position to the top of the water column rise Due to the deeper immersion of the duct, the required wind pressure is increased, which is limited by the rated wind pressure of the air compressor. The pumping start wind pressure does not exceed the rated wind pressure of the air compressor. When the starting wind pressure is the rated wind pressure of the air compressor. From the (3-1) formula, it can be seen that the underground buried depth of the duct mixer is not more than (10P0-2) m. Through the above analysis, the pumping technical parameters including the pumping duct immersion ratio are correctly designed for the pumping test. Work is of great significance. The direct test data that can be obtained by the pumping test is the corresponding data pair of flow and depth reduction. Only by setting the appropriate flow rate and depth reduction value, the appropriate pumping design technical parameters can be calculated, and the air duct can be installed according to the appropriate pumping technical parameters. With technical equipment, it is possible to save time, reduce costs, and ensure and improve the quality of hydrogeological pore pumping test data. Therefore, do a good job in pumping test. It is necessary to do a good job in geophysical hydrogeology in the early stage, understand the water level of the natural flow field in the mining area, and change the flow rate. It must also be equipped with appropriate pumping equipment to ensure that the pumping test is smooth, feasible and reliable.
4 Application examples In the Yongding Dongzhong Tiandi limestone mining area in Fujian, in 2007, in order to understand the water-richness and permeability of the direct aquifer in the Erdiqixia Formation limestone deposit under the open-pit mining in the mining area, the 60' was constructed in the western part of the mining area. Hydrogeological hole, the hydrological hole began to use deep well pump to pump water, the water level deepened and the water level, the flow stability state was far from the requirement, and the pumping test work was unsuccessful. After that, the air compressor was used for pumping. Through the pumping test, the hydrological parameters such as the permeability coefficient and unit water inflow of the direct aquifer of the Litho Formation of the Lower Permian Xia Formation in the mining area were obtained. The technical parameters of the pumping test in the following table are the actual technical parameters formed after the pumping test.
It can be seen from the actual technical parameters and design technical parameters that with the decrease of the immersion ratio of each pumping duct, the working wind pressure and power equipment power are gradually reduced, and the excessive air duct immersion ratio causes the designed pumping wind pressure to be smaller than the actual Pumping wind pressure also caused the actual air unit consumption to be far greater than the amount of air required to be consumed by the actual head, increasing equipment load and waste energy consumption, resulting in a decrease in the pumping water level and the influence radius and flow rate. In the case of stability, it affects the reliability of the hydrogeological parameters of the target aquifer. 5 Conclusion At present, in order to shorten the exploration period and exploration cost, many mining areas often combine the detailed investigation and exploration stages, and arrange hydrogeological holes for hydrogeological exploration in the mining area. Work, often lacking the necessary natural flow field water level, flow change trend and rate data in the pre-examination and census stage, neglecting the hydrological hole pumping test should design the appropriate pumping hole duct immersion ratio and other pumping design technical parameters, for pumping equipment The installation of the instrument brings blindness, resulting in distortion of the pumping test results. Correctly analyze and evaluate the hydrogeological characteristics of the aquifer in the mining area and predict the consequences of the speed of the mine. On the contrary, the investigation collects rich hydrogeological data of mining areas to set relatively suitable technical parameters such as pumping pipe immersion ratio, in order to obtain more realistic mining pumping test data, and provide reliable basic data for analyzing and predicting the changes of hydrogeological characteristics in mining areas. Guarantee.
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