Method for calculating optimal water content of fine-grained soil in compaction test
A technology for optimal moisture content and compaction test, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problem of large differences in the results of optimal moisture content and maximum dry density, lack of comparability of test data, and optimal moisture content. Differences and other issues, to achieve the effect of easy understanding and application, simplifying construction procedures, and ensuring accuracy
Active Publication Date: 2016-09-07
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology
The standard compaction test recommended by the current regulations in my country has certain shortcomings, that is, when different engineers and technicians process the data, the proportions of drawing coordinates are different, and the difference in finding the peak point in the moisture content-dry density diagram leads to the The results of the optimal water content and maximum dry density obtained by the calculation are quite different, which makes the test data lack of comparability
The reason is that the analysis of the dry density-moisture content curve is arbitrarily large, so that the same soil, different time and place, and different experimenters have different optimal moisture content.
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[0050] Demonstrate the specific implementation process of the present invention with sandy low liquid limit silt, basic physical parameters are shown in Table 1;
[0051] Table 1 Basic physical parameters of sandy low liquid limit silt
[0052] Soil specific gravity G s
The volumetric moisture content of soil in saturated state θ sat (%)
2.7
0.366
[0053] step 1,
[0054] Take sandy low liquid limit silt and carry out indoor compaction test according to the current specification. The soil sample is placed in a cylindrical compaction cylinder, and then the compaction work is applied. Each layer is carried out according to the specification procedure until the maximum dry density is reached. After the compaction of the soil sample is completed, the moisture content of the soil sample is determined by the moisture content test. This process was repeated 5 times, each time the water content was increased or decreased with a gradient of 2%. After ...
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Abstract
The invention discloses a method for calculating optimal water content of fine-grained soil in a compaction test. The method comprises the following concrete steps: subjecting fine-grained soil to an indoor compaction test according to current specifications; on the basis of a water content-dry density curve graph in C-shaped curve distribution obtained in a laboratory, establishing a water content-dry density equation with the Bernoulli equation as reference and subjecting parameters of the equation to regression analysis; and subjecting the water content-dry density equation to derivation so as to obtain optimal water content. The method for calculating optimal water content of fine-grained soil in a compaction test is provided on the basis of considerable experimental studies and analysis of the theory of optimal water content, and overcomes the technical problem of poor precision in taking an optimal water content value in conventional compaction tests; the theoretical foundation of the method is sufficient; and the method is simple and has good practical application value.
Description
technical field [0001] The invention belongs to the technical field of soil compaction tests, and relates to a method for calculating the optimal moisture content of fine-grained soil compaction tests. Background technique [0002] At present, compaction tests are required to test the maximum dry density and optimal moisture content of soil. The standard compaction test recommended by the current regulations in my country has certain shortcomings, that is, when different engineers and technicians process the data, the proportions of drawing coordinates are different, and the difference in finding the peak point in the moisture content-dry density diagram leads to the The results of the optimal water content and maximum dry density obtained are quite different, which makes the test data lack comparability. The reason is that the analysis of the dry density-moisture content curve is arbitrarily large, so that the same soil, different time and place, and different experimenters...
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IPC IPC(8): G01N9/36
CPCG01N9/36
Inventor 张军辉戴良良郑健龙冯百纯彭俊辉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY