Every link and detail in engineering geological survey will have an important impact on the final result, so in the process of engineering geological survey, every step should be cautious to avoid all kinds of mistakes. In addition, making full use of the related achievements of hydrogeological exploration and expanding the application scope of this link can better promote the engineering geological exploration. A large number of practices show that under the guidance of the development of hydrogeologic exploration and other technologies, China's engineering geological exploration has been rapidly developed and improved, and it is also more dynamic and competitive. This paper briefly analyzes and discusses the influence of hydrogeology on engineering geological investigation and the main harm of hydrogeology problems to engineering geological investigation.

I. Introduction

With the rapid development of national economy, the level of engineering geological exploration has been continuously improved. Therefore, more and more people are concerned about the progress of hydrogeological investigation, hoping that engineering geological investigation can meet higher quality requirements. Hydrogeological survey is a very important link in the whole engineering geological survey process. Accordingly, in order to ensure the smooth completion of this important link, relevant personnel should pay close attention to the institutionalization and standardization of this process, and at the same time, relevant units and departments need to make corresponding norms and supervision in terms of quality norms, responsibility commitment, responsibility distribution and technical regulations. It is particularly important to improve the geotechnical hydrogeology research of engineering geological exploration units. In the process of carrying out systematic and good geotechnical hydrogeology research, it is necessary to conduct in-depth analysis and research on its exploration process and their relationship, and then carry out reasonable and scientific management. Based on the actual engineering geological survey, this paper simply studies and analyzes the influence of hydrogeology on engineering geological survey, as well as the main harm of hydrogeology problems to engineering geological survey and other related issues.

Second, the influence of hydrogeology on engineering geological investigation

In geotechnical engineering investigation, it is an indispensable and important process to conduct reasonable scientific research on hydrogeological problems encountered. First, it is necessary to carefully analyze the possible impact of groundwater on superstructure or rock and soil, so as to make a reasonable prediction and analysis of this impact before the start of exploration projects, and then give solutions in time when problems arise. Secondly, if there are some hydrogeological problems in the exploration project, it is necessary to scientifically and reasonably combine the foundation characteristics of local buildings and the characteristics of foundation engineering, and systematically analyze the specific causes of hydrogeological problems in this area. Only in this way can we give specific and detailed information about local hydrogeology. Thirdly, if the foundation of some underground buildings is below the groundwater level, the corrosive effect of groundwater on the buildings should be considered, and only in this way can the building quality be improved. The foundation bearing layer of some engineering sites belongs to rock and soil, such as weak or strongly weathered rock, residual soil or expansive soil. In the process of construction, collapse, expansion, contraction and softening are likely to occur, so it is necessary to pay attention to the analysis of these sites when groundwater activities occur; In some engineering sites, the fine sand layer will be saturated or loose, which occurs in the foundation and the compression layer of the foundation. Therefore, in this kind of engineering site, we should pay attention to the possible quicksand, piping and undercurrent, and give analysis and evaluation. However, there is a confined water layer under the foundation of some engineering sites, which may cause some damage to the foundation pit floor. Therefore, after excavation, this possibility needs to be recalculated, analyzed and evaluated. In some Buddhist cities, the foundation pit may be higher than the groundwater level, so it is necessary to carry out infiltration experiments and water-rich experiments during construction to ensure the safety and reliability of the project.

Three, the main hazards of engineering geological investigation of hydrogeological problems.

1, the harm caused by groundwater hydrodynamic pressure.

Generally speaking, if groundwater is not treated manually, the hydrodynamic pressure of groundwater encountered in geotechnical engineering investigation will not have much impact on exploration engineering. But the hydrodynamic pressure is also greatly influenced by human factors. Deliberately destroying this equilibrium type may increase the hydrodynamic pressure, bring a lot of inconvenience to exploration, and even cause major problems in exploration engineering, such as quicksand, which is also greatly affected by these geology.

2. Hazards caused by groundwater level fluctuation.

First of all, the harm caused by the decline of groundwater level. Under normal circumstances, natural conditions will not lead to the obvious decline of groundwater, and only human factors are the main reasons for the decline of groundwater. Man-made factors leading to the decline of groundwater level mainly include serious groundwater extraction in exploration area, groundwater extraction in the production process of mining enterprises, water conservancy project construction in exploration area, etc. , which will seriously cause the groundwater level to drop. When the groundwater level in a certain area drops sharply, various geological disasters such as geological collapse are likely to occur in this area, which will cause serious shortage of groundwater and serious impact on the decline of groundwater quality. These problems caused by the decline of groundwater level will greatly affect human production and life.

Secondly, the harm caused by the rise of groundwater level. Usually, the rise of groundwater level is influenced by many factors, the most important of which is divided into two parts: conscious geological factors, such as aquifer structure and overall lithologic occurrence; The second is hydrometeorological factors, such as construction or irrigation. In many cases, the rise of water level is the result of the comprehensive action of many influencing factors. The abnormal rise of water level will bring a series of serious consequences, which will have a corrosive impact on the foundation of buildings, lead to serious situations such as the collapse of soil such as slopes or river banks, weaken the bearing capacity of soil layers, accelerate the liquefaction speed of some soil layers, and even cause more serious geological damage such as piping or quicksand, which will seriously damage projects, especially foundation projects.

Finally, the harm caused by frequent fluctuation of groundwater level. For some expansive rock and soil, if the groundwater level changes to a great extent, it is likely to lead to geological changes such as expansion or contraction of rock and soil layers. Once the groundwater level rises and falls too frequently, it will not only cause the repeated expansion and contraction of rock and soil, but also cause the continuous strengthening of the expansion and contraction range of rock and soil, which will lead to hazards such as ground cracks and eventually cause serious damage to buildings, especially light buildings. In addition, once the groundwater level changes too frequently in a certain area, it will lead to the rapid loss of iron, aluminum and other elements in the geotechnical layer and reduce the bearing capacity of the geotechnical layer. Therefore, the foundation of the project needs to be treated with more caution and stricter requirements. At the same time, mature exploration technology also plays an important role in such exploration projects.

Four. Concluding remarks

To sum up, hydrogeology has greatly promoted contemporary engineering geological exploration. In the past, the research of geotechnical engineering geological investigation generally only focused on the quality management of the investigation site, and other aspects were basically blank. In this case, there are many loopholes in the research of engineering geological survey, which is difficult to adapt to the pace of modern social progress. Therefore, it is particularly important to improve the geotechnical hydrogeology research of engineering geological exploration units. In the implementation of systematic and good geotechnical hydrogeology research, it is necessary to deeply analyze and study its investigation process and their relationship, and then carry out reasonable and scientific management. In addition, with the rapid development of contemporary engineering geological exploration, the competition among enterprises is more intense, which will inevitably affect the reduction of their interests. Therefore, geotechnical hydrogeologists need to change the traditional extensive management concept to intensive management mode. In the geotechnical hydrogeology research of engineering geological exploration, if we want to highlight the advantages in the market competition, we must grasp the core issues and control the exploration points.

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