Geotechnical engineering investigation and analysis of water conservancy construction engineering?

Water conservancy project is an important project for flood control, water resources regulation, water flow control and reasonable space allocation in China. In the construction of water conservancy projects, it is necessary to repair dams and dikes, which can conform to the trend of the times and realize the water conservancy construction goal in China's long-term development strategy. With the development of manufacturing technology and science and technology, water conservancy construction projects have also made great progress. Geotechnical engineering investigation is a very important work link in water conservancy projects, and the relevant state departments have compiled the corresponding scope and technical standards of water conservancy and hydropower projects. This paper briefly analyzes the geotechnical investigation of water conservancy construction projects in Hengshui area.

1

In the actual work process, it is necessary to choose different investigation purposes and methods according to the actual work plan and progress, among which the investigation classification and the principle of investigation point layout are the key points.

1. 1 purpose of investigation

Geotechnical engineering investigation of water conservancy construction project is the foundation and premise of actual engineering construction. By detecting the local geotechnical and natural conditions in advance, and through the corresponding technical evaluation and professional analysis, it can provide guidance for the actual construction of water conservancy projects.

1.2 investigation and classification

Geotechnical engineering investigation of water conservancy construction projects can be divided into different levels, from shallow to deep, including preliminary inspection, detailed inspection and feasibility investigation. The investigation and classification work should be decided according to the different progress of the project, and usually different schemes are formulated according to the complexity of the site and terrain where the project is located.

1.3 exploration method

In water conservancy construction, geotechnical engineering investigation mainly adopts drilling, sampling along the way, in-situ testing, engineering geological mapping and so on. Engineering geological surveying and mapping includes different methods such as investigation, interview and geological survey. In the actual investigation process, the number and spacing of drilling holes should be determined according to the construction scheme and actual technology, and the water conservancy exploration points should be divided along the main line of the construction project, and the distance between the two exploration points should be within 50m. Geotechnical engineering exploration points should be designed along the outline and layout of the building, and the distance between the two points should not be greater than 30m. When sampling, several groups of disturbed soil samples, water samples and undisturbed soil samples should be taken respectively.

2 engineering geological conditions

The terrain in Hengshui area is relatively simple. In North China, the whole terrain is gradually inclined. There are many depressions in this area. Cracks in Hengshui area are generally distributed in sheets, and the elderly can reach 43m, which is very serious. According to the report, ground fissures occurred in 1983 to 1999 for more than ten years. According to historical records, in 1882, a strong earthquake of magnitude 6 occurred in Shuangjing, Shenxian County. The ground was located in the geological fracture zone, and the underground geotechnical structure in the region was unstable as a whole.

2. 1 climatic conditions

Hengshui area belongs to continental monsoon climate, and its natural conditions change greatly throughout the year, with drought and little rain in spring, hot and humid in summer, dry and cold weather and large temperature difference throughout the year. The precipitation time in this area is concentrated in summer, and the southeast wind prevails, which is also the most significant area in the world with monsoon climate. From June to September, the annual precipitation in this area is relatively concentrated. The precipitation in the east is obviously higher than that in the west, and the annual precipitation changes greatly.

2.2 Hydrogeological conditions

There are four major water systems and nine rivers flowing through Hengshui area, which is rich in groundwater. Groundwater will change with the change of seasons and rainfall, and the wet season is from June to September.

2.3 Formation lithology

The strata in Hengshui area are distributed from bottom to top, including Proterozoic strata, Paleozoic strata and Tertiary strata, in which light loam is widely distributed, mostly in the local geological interlayer, with a small amount of sandy soil and cohesive soil. During the exploration, we found that there are a lot of fully weathered granite and plastic silty clay in the Quaternary alluvium.

3 Classification of soil along the project

After the actual investigation of geotechnical engineering of water conservancy and hydropower projects is completed, the staff should make a relative analysis and evaluation of the foundation and geotechnical distribution of the proposed project according to the investigation results, and determine the foundation scheme.

3. 1 Long-term stability evaluation

According to the Code for Seismic Design of Buildings, we can see the importance of long-term stability evaluation for architectural design and manufacture. We can investigate and classify the water temperature, soil distribution and natural landform of the construction site, fit the site category, test the seismic intensity of the selected building basement, and analyze whether the selected site can be used to verify the building basement.

3.2 Basic assessment

The emphasis of foundation evaluation is to investigate and test the bearing capacity of foundation soil, the frost heaving of site soil and the uniformity of foundation. Evaluation can greatly improve the quality of construction projects and effectively prevent and prevent soil erosion. The determination of bearing capacity along the way is also the key point in geotechnical engineering investigation of water conservancy construction projects. In practical work, it is necessary to analyze the rock characteristics of the construction site. Generally, the land bearing capacity of the site is determined by looking up the table and in-situ and theoretical tests. In practical work, people often refer to Hansen formula to determine the bearing capacity of foundation.

3.3 Determination of Groundwater

In the geotechnical investigation of water conservancy buildings, it is also an important work to determine the groundwater level, which has great influence on water conservancy buildings. During the survey, the wet season and dry season of the building base should be determined, and different time measuring methods should be adopted according to different actual conditions. In practical work, exploration work may be limited by construction period and weather, so we can grasp the laws and information that have constituted groundwater changes by consulting relevant information. When measuring the permeability of groundwater, it is best to determine the horizontal permeability coefficient of foundation by field test and indoor test, and the groundwater level test should be carried out according to the actual requirements and work progress of the project.

4 conclusion

Different meteorological, climatic, geological and hydrological conditions are important factors and preconditions that affect the smooth construction of water conservancy projects. Only on this basis can we choose and adjust the working measures and methods, thus causing certain difficulties to the geotechnical engineering investigation of water conservancy construction projects. Because the water conservancy project construction must bear the buoyancy, thrust and scouring force of water, the project itself is extremely complicated and difficult, which further deepens the importance of geotechnical engineering investigation. Compared with traditional ground buildings, hydraulic engineering buildings need more comprehensive factors and have strong particularity, which directly determines the position of geotechnical engineering investigation in the process of water conservancy construction. Therefore, it is necessary to strengthen the geotechnical investigation of water conservancy projects and make the investigation results scientific.

For more information about project/service/procurement bidding, and to improve the winning rate, please click on the bottom of official website Customer Service for free consultation:/#/? source=bdzd