Judging from the actual situation, China's previous exploration specific operation mode has long been out of touch. Coupled with the continuous refinement of professional classification, it can no longer meet the actual production needs. Specifically, field records are becoming more and more irregular, and the soil sampler used is useless, so it is difficult to use the charging standard set by the state. The comprehensive valuation method based on drilling is very popular in the market, but it is in a weak position for geotechnical test, analysis and evaluation that should be paid attention to. At the same time, the exploration market is mixed. Illegal phenomena such as mutual price reduction, subcontracting, subcontracting, and high kickbacks are widespread. It is necessary to strengthen the professional quality education and professional ethics education of relevant employees. If the professional knowledge is not too hard and the sense of responsibility is not strong, various problems, potential safety hazards and even accidents will inevitably occur. In this regard, the state should rectify the market, improve the market access mechanism, strengthen the professional technology and professional ethics education of employees, get rid of the disadvantages, and make the geotechnical engineering survey market develop healthily and orderly.
1. Depth and spacing of survey.
Geotechnical engineering investigation is a complicated work with the characteristics of great difficulty, heavy task and strong assault. At the same time, due to different engineering geological properties and different survey depths, the survey difficulty is further increased. In dense gravel soil and bedrock areas with shallow burial and good engineering geological properties, the depth of exploration hole is shallow, while in silt and loose miscellaneous fill areas with poor engineering geological properties, the depth of exploration hole is deep, so it is necessary to know the general situation of exploration area before exploration in order to have a clear aim. In the actual geotechnical engineering investigation, the complicated investigation environment greatly hinders the setting of investigation points and the selection of density, affects the accuracy of investigation work, and also lays a potential safety hazard for the later engineering construction.
2. Problems in in-situ testing.
In-situ testing plays an important role in geotechnical engineering investigation, which can provide basic parameters such as stratum distribution and geotechnical characteristics for engineering construction, and provide important support and guarantee for later foundation design and construction. However, in the practical application of testing methods, different testing methods have different principles and applicable conditions, so it is necessary to choose the appropriate testing method according to the characteristics of the investigation. However, in geotechnical engineering investigation, there is an unreasonable problem of in-situ testing, which is a later project.
The construction has laid a safety hazard.
3. The problem of silt
In geotechnical engineering investigation, silt is an important investigation object, which has an important influence on later construction. Different from clay and sand, silt has unique properties, showing the characteristics of aggregate and having high liquefaction resistance. However, the particle size separation experiment of silt is complicated, which will lead to misjudgment in geotechnical engineering investigation, lack of comprehensive and accurate understanding of silt, and have a great impact on the seismic cost of the project. In addition, in geotechnical engineering investigation, there are still some problems such as imperfect investigation scheme and insufficient scheme selection, which have a far-reaching impact on the project cost.
4. Operational problems
In geotechnical engineering investigation, the final results can only be obtained through a lot of practical activities. Without the investigation and analysis of the geotechnical engineering of the site, it is impossible to accurately grasp the geotechnical engineering properties of the site. Without these foundations, it is difficult to carry out the follow-up work accurately and orderly. In the long-term engineering activities, we have made a necessary understanding of the geological and geotechnical conditions of the engineering site, but neglected the brush conditions of the construction site, and did not conduct a thorough and necessary investigation and understanding of this area, resulting in the lack of regional factors in the work results, which will have a certain impact on future construction activities. In actual engineering practice, there are still the following disadvantages: lack of due attention to regional engineering activities, obvious lack of relevant experience, too dogmatic application of some regulations, and so on. The existence of these conditions affects the efficiency and achievements of engineering practice, and sometimes even causes waste of resources.
5. Earthquake problem
Buildings have certain requirements for their seismic design, and extremely important buildings need to carry out beam detection, and the specific details are clearly defined, so it cannot be judged by experience for convenience. When measuring a single building, there should be two or more wave velocity holes; When surveying high-rise buildings, there are few requirements for the number of wave velocity drilling holes, but there must be at least one. This provision has obvious defects. It does not distinguish the strength of the earthquake zone, nor does it consider the shear wave value after foundation treatment and the soil type of the site. At the same time, if we do not pay corresponding attention to geotechnical engineering evaluation and foundation planning, problems will also arise.
6. Problems existing in enterprise management
With the large increase of engineering construction in recent years, the original exploration unit is closer to enterprise operation. Self-financing leads exploration units to pay more attention to their own interests and ignore the quality of labor results to some extent. There are some problems. At the same time, the original supervision within the unit is not strict, and the requirements for work quality are declining; Try your best to pursue benefits and ignore the quality of work. Due process exists only in form. In the workplace, it is often because of saving time that all links are accidentally standardized: drilling, testing, sampling and so on.
7, non-standard operation problems
In the relevant documents of the state and industry, there are clear and detailed provisions on exploration work, such as spacing and quantity. However, in practice, it is very common not to operate according to the corresponding specifications: the hole spacing exceeds the requirements and the hole depth does not meet the requirements. When accepting the business, some investigation units failed to seal the wax mark in time for inspection and treatment; When selecting the number of samples, many details such as the size of the site, the state of the foundation soil, etc. They are all ignored and only pursue the requirements of the construction period, leaving the unity and representativeness that sampling should follow. Such irregular operation will inevitably have a negative impact on the follow-up work. In addition, the phenomenon that the drilling footage is excessively increased without considering the exploration grade, which does not increase the value of workload, also occurs from time to time.
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