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Anonymous users2024-02-16During hydrogeological drilling, cores are required to be numbered immediately after each lift, carefully observed, described, measured, and cataloged.
1) Do a good geological description of the core. The observation and description of the core is mainly lithology, structure, structure, sequence, layer thickness, porosity, permeability, etc. There are two points worth noting, one is to pay attention to the observation and description of phenomena that cannot be seen on the surface, such as the development of pores and fissures in unweathered strata and their filling and cementation, traces of groundwater activity (dissolution or sedimentation), and the discovery of unexposed rock layers and structures on the surface; The second is to pay attention to analyzing and distinguishing some illusions caused by drilling, and to distinguish them from natural phenomena.
For example, the crushing and grinding marks caused by drilling in some bedrock layers, the distortion, thinning, missing and dislocation of the strata, the disturbance of the loose layer, the destruction of the structure, etc.
2) Calculate the core take rate. The core taking rate refers to the ratio of the length of the core taken to the footage of the borehole, which is calculated as follows:
Specialized in hydrogeology.
where: ku is the core taking rate, dimensionless; l0
is the total length of the core taken (m); l is the drilling footage length (m).
The core taking rate can judge the degree of fragmentation of hard rock and the strength of karst development, and then analyze the permeability of rock and determine the level of aquifer. Generally in bedrock, ku
70%, in tectonic fracture zones, weathering collision pure zones and fractures, karst zones, ku
3) Statistical fracture rate and karst rate. The fracture rate or karst rate of bedrock is a reliable marker used to determine the degree of development of rock fractures or karst and to determine the location of the aquifer. In drilling, only linear statistics are usually made, which are calculated using the following formula:
Specialized in hydrogeology.
where: y is the linear fracture rate or linear karst rate; l is the length of the statistical segment (m); ∑bi
is the total width (m) of the fracture or karst measured on the parallel core axis in the L section; ku
is the core taking rate in section L.
4) Generally, a comprehensive detection well is carried out in the hole after the final hole, so as to accurately divide the aquifer (section) and obtain relevant parameter data.
5) According to the designed horizon or depth, take rock or soil samples of fixed specifications (volume or weight) or fixed direction from the core or borehole for observation, identification, analysis and experimentation. Such as taking samples such as spore pollen, isotopes, paleomagnetism, etc.
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Anonymous users2024-02-15Samples should be taken for observation to determine if they are consistent with the geological survey report. If there is inconsistency, there are two situations, one is that the actual situation is better than the geological exploration report. In this case, the pile foundation finally formed by the hole is better than the design, and the pile hole can be regarded as qualified.
Another situation is that the actual situation is worse than that of the geological survey. In this case, the pile foundation quality finally formed by the hole does not meet the design requirements, which should be judged as the pile hole is unqualified. At this point, the design needs to be notified to make a design change to the hole.
Such as: deepening, enlargement, replacement ......Wait.
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