Analysis of the main points of attention of geological survey for water extraction from boreholes

In the design and construction of geotechnical engineering should be strengthened in the groundwater survey, and the survey of the taxation bureau for accurate analysis, in order to develop groundwater impact prevention program to reduce the harm of groundwater on geotechnical engineering. In order to facilitate the evaluation and analysis of the impact of groundwater on geotechnical engineering, the author believes that it is necessary to separate the measurement of static water level. When surveying the static water level, we should adhere to the principle of stratified survey, develop a certain survey schedule, and perform the unified measurement of static water level after the survey of the project is completed, and pay attention to the determination of static water level which requires the measurement of water pipes deeper than 20cm into the aquifer in order to measure the effective data.

The hydrogeological survey in geotechnical engineering should ensure that the natural geographic conditions and geotechnical properties and conditions are surveyed in parallel. Geotechnical engineering in the physical geography of the survey focus on the topography, meteorological and hydrological characteristics, geological environment and geotechnical hydrological properties of the survey unified, and highlight the analysis of the hydrological properties. The hydraulic properties specifically refer to the soil properties of geotechnical soils under the action of groundwater, including the permeability, water-supply, softening, disintegration, expansion and contraction of geotechnical soils. In the rock layer hydraulic properties survey using sampling testing of hydraulic properties can refine the analysis of rock layer hydraulic properties, and according to the analysis data to guide the engineering foundation design, reduce the erosion hazard of groundwater on the engineering foundation.

In view of the adverse effects of groundwater, the geotechnical engineering site survey focusing on groundwater investigation is necessary and urgent. In the process of groundwater survey, attention should be paid to the survey of groundwater level retention status and aquifer and submerged layer distribution, and further make impact prediction according to the data and set up effective preventive measures; in the field survey of geotechnical engineering, also refer to the needs of engineering foundations and other basic engineering links, start a comprehensive survey of the hydrological conditions around the project, and develop a program of artificial control intervention for groundwater level rise and fall to reduce the In the design of geotechnical engineering, attention should be paid to the design of engineering foundation, the design of engineering foundation is related to the dynamic water pressure of the pressurized aquifer under the foundation, for which emphasis should be placed on strengthening the analysis and evaluation of the parameters related to the impact of the dynamic water pressure of pressurized water on the bottom slab after the excavation of the foundation pit is completed, and reasonable design and improvement of construction, the reasonable design of foundation will reduce the impact of the dynamic water pressure of groundwater. Foundation design will reduce the impact of groundwater dynamic water pressure, thus reducing the erosion of the engineering foundation slab; in the construction of attention to the selection of corrosion-resistant concrete materials to improve the corrosion resistance of the project slab, extending the service life of the project; in the site survey should also pay attention to the nature of the groundwater rock layer, and on the project is very likely to appear in the spouting, sand flow and other issues to focus on prevention intervention.

Conclusion

Geotechnical engineering quality is often affected by groundwater, so in the current geotechnical engineering design and construction to join the exploration of groundwater investigation. With strict groundwater investigation requirements, we can develop a plan on the impact of groundwater on soil, reduce the hazard of groundwater and increase the stability of the project.

PQWT-GT series ground water detector produced by Hunan Puqi Geological Exploration Equipment Research Institute is a natural electric field as the working field source, based on the resistivity difference of underground rocks and ores or groundwater, measuring the electric field components of N different frequencies of the natural electric field on the ground, and studying the abnormal changes of different geological bodies according to their change pattern, to achieve an electrical method to solve geological problems. achieve a kind of electrical exploration method to solve geological problems. It is widely used in the exploration of groundwater sources, geological structures, veins, mining channels, cavities, caverns, anthills, mining areas, dikes and pipe surges, landslides and other fields.