SONDAGEM SPT NA PRÁTICA. COM INTERPRETAÇÃO DO RELATÓRIO!

SCHEDULE A CONSULTATION: https://forms.gle/uu2j22sokNfaETcX7 FOLLOW RVCAST: https://open.spotify.com/show/5mmmgJX... INSTAGRAM (@rvconstrucoesepericias):   / rvconstrucoesepericias   WhatsApp: (13) 99674-3763 Email: [email protected] Website: www.rvconstrucoesepericias.com.br SPT SOIL INVESTIGATION The SPT, or Standard Penetration Test, is the most commonly performed soil test before foundation design or excavation work. Its purpose is to study and understand the soil. The work will proceed as planned. Its cost is very low compared to the problems the project may encounter if a soil investigation is not carried out. It only varies from 1 to 2% of the total cost of the project. The test is performed through vertical drilling in the soil mass, the so-called boreholes. The requirements are: Minimum of 2 boreholes; Up to 1200m²: 1 borehole for every 200m²; Between 1200m² and 2400m²: 1 borehole for every 400m²; Maximum distance of 100m; The boreholes should not be aligned; Drill holes near the edges of the area. These boreholes are drilled using a helical auger with a drill bit, which aims to break up the soil to extract samples. In addition, it has a casing tube with threaded rods for soil collection. As the drilling progresses, new soil segments are added to both the rod and the casing pipe. Initially, a tactile-visual analysis is performed, and then the samples are analyzed in a laboratory to prepare the drilling report. The rod is driven into the ground by a 65 kgf cast iron mass, called a "hammer." For driving, this hammer is raised to a height of 75 cm and then allowed to fall freely. The hammer is raised manually or, more commonly, using mechanical equipment, via a flexible rope that passes through a pulley on the top of a tripod. The sampler is driven into the soil by successive hammer drops until a penetration of 45 cm is achieved, with the number of blows recorded every 15 cm, i.e., 3 times. For the purposes of this result, disregard the data relating to the first 15cm section and define the penetration resistance (NSPT) as the number of blows required to drive the remaining 30cm of the sampler. In soft soils, a reference value in the range of 5 is adopted for the penetration resistance index, acquired over time from geotechnical engineering experience. SPT-T The SPT-T sounding is a geotechnical investigation tool that allows the analysis not only of the soil penetration resistance index, but also the resistance to impact (force x distance) that the soil mass presents, which can also be interpreted as the maximum or residual torsional resistance. The soil torque is measured with a torque meter, which is analyzed at each 45cm SPT penetration test. Its unit of measurement is kgf.m. Based on experience, since there is no standard value for this classification, the SPT-T value for soil with low bearing capacity is in the range of 20 kgf.m or less.