What is the soil compaction test, and what is the significance of the soil compaction test to the pr

The time taken for soil test results varies depending on the test project and the actual situation of the laboratory, and in general, it takes 2-15 days for common soil test indicators to produce results.

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First of all, there are many types of soil testing indicators, including organic matter, total nitrogen, available phosphorus, available potassium, pH value, salinity, heavy metals, microorganisms, etc. These metrics vary in how they are measured and processed, so the time to results varies. For example, soil heavy metal testing usually takes 5-7 working days, while soil organic matter and pH testing is faster, usually taking 2-3 days.

In addition, the actual operation of the laboratory can also affect the time it takes to produce results. For example, the number of equipment in the laboratory, the number of samples, the skills and experience of the testing personnel, etc., can all have an impact on the testing time. If the number of samples is large or the equipment fails, it may lead to longer testing times.

To ensure soil testing.

For the accuracy and reliability of the results, laboratories need to follow certain operating procedures and quality control measures when carrying out soil testing. These measures include sample collection, preservation, processing, and analysis, which require a certain amount of time and manpower. Therefore, the time for the results of soil testing indicators is not fixed, but depends on the specific situation.

The soil is the soil for growing crops, and the correct name should be "geotechnical compaction test".

The geotechnical compaction test is divided into two kinds: light and heavy, the light compaction test is suitable for the cohesive soil with a soil particle size of less than 5mm, and the heavy compaction test is suitable for the soil with a particle size of no more than 20mm, and the maximum particle size is not more than 40mm. The compaction work per unit volume of the light compaction test is about, and the compaction work per unit volume of the heavy compaction test is about.

At least 5 soil samples with different moisture content should be prepared for the geotechnical compaction test, and after the compaction test is completed, the relationship curve between the moisture content and the dry density is drawn, the peak value of the curve is found, the maximum dry density and the best moisture content of the soil are determined, and the parameters are provided for the subgrade filling. - This is the purpose of the geotechnical compaction test.

Hello dear, glad to answer for you. What is the significance of the compaction test of the soil book school to the project: under normal circumstances, for the backfill project, in order to achieve the maximum compaction degree of the earthwork backfill, the compaction test should be done to determine the best moisture content and the maximum dry density.

There is no provision for the applicable materials, but there is a requirement for the backfill to carry the simple spirit, that is, the degree of backfill compaction, generally more than 95 percent, in order to determine the best state of the soil sample backfill, how much moisture content, the maximum dry density and so on, and then when the layered backfill, it is necessary to do another test to see the effect of the backfill. The experiment is divided into two methods: light compaction test and heavy compaction test, the light compaction test is suitable for cohesive soil with a particle size of less than 5mm, and its compaction function per unit volume is; The heavy-duty compaction test is suitable for soil with a particle size of less than 20mm, and its single-state volume compaction function is.

Compaction test refers to a method of hammering a solid soil sample to understand the compaction characteristics of the soil. This method is to use different compaction work (hammer weight, falling distance, hammer times) to hammer the soil samples with different water content respectively, and measure the corresponding dry bulk density, so as to obtain the maximum dry bulk density (generally refers to aggregate accumulation or compact density), the optimal water content, and provide a basis for the design and construction of the filling project.

The compaction test can be divided into light compaction test and heavy compaction test. The light compaction test is suitable for cohesive soils with a particle size of less than 5 mm, while the heavy compaction test is suitable for soils with a particle size of less than 20 mm.

Rationale:

The purpose of the compactor is to use the compactor to measure the moisture content (optimal moisture content) and the dry density (maximum dry density) of the soil sample when it reaches the maximum density under the action of a certain compaction function, so as to understand the compaction characteristics of the soil.

At present, there are two commonly used compaction methods in China:

1) Light compaction: suitable for fine-grained soil with a particle size of less than 5mm, the diameter of the hammer bottom is 51mm, the weight of the hammer is 305mm, and the compaction work per unit volume is; It is tamped in 3 layers, with 25 hits per layer.

2) Heavy-duty compaction: suitable for soil with particle size not more than 40mm. The inner diameter of the compacting cylinder is 152mm, the height of the cylinder is 116mm, the hammer mass is, the falling distance is 457mm, and the compacting work per unit volume is m (other is the same as light compaction); Solid in 5 layers, 56 hits per layer.

As the basic material of the building, the soil must obtain the test of the best moisture content when the maximum dry density under the same conditions as the site can obtain the maximum compaction of the soil foundation and ensure the stability of the building.

The compaction test is to use standardized compaction instruments to test the relationship between the density of the soil and the corresponding water content under the conditions of the simulated site, and find out a relationship curve, which is the real purpose of compaction.

When the soil is used as a filling material, and needs to have a certain strength and deformation requirements, the compactness of the fill should be controlled, and the dry density is measured by using soil with different moisture content through the test, and the optimal moisture content and the maximum dry density are obtained through linear relationship. After that, the maximum dry density is used to specify the degree of compaction.

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In the process of compaction, because the compaction work acts on the soil instantaneously, the gas in the soil is partially removed, and the amount of water contained in the qin is basically unchanged. The unit compaction of the heavy field call type compaction method is twice that of the light compaction method.

Answer]: The physical significance of the compaction test is that under the action of a certain compaction function, the filling soil can reach the maximum density, that is, the optimal moisture content and the maximum dry density. The required water content is called the optimal water content, and the corresponding dry density is called the maximum dry density.