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A Calculation Method of Loess Shear Strength Based on Porosity
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A technology of shear strength and calculation method, applied in the field of rock engineering, can solve the problem of unclear effect of loess shear strength
Active Publication Date: 2022-04-29
KUNMING UNIV OF SCI & TECH
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[0004] In view of the unclear effect of porosity on loess shear strength in the prior art, the present invention provides a method for calculating loess shear strength based on porosity. The present invention is based on direct shear tests of loess with different porosities, and builds a The porosity loess shear strength calculation model, according to the loess shear strength calculation model based on porosity, can quickly determine the loess cohesion, internal friction angle and shear strength parameters according to the porosity of the soil
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Embodiment 1
[0050] Embodiment 1: A method for calculating loess shear strength based on porosity, the specific steps are as follows:
[0051] (1) Measure the density ρ, water content w and specific gravity G of the loess S , to calculate the porosity n of the loess;
[0052] The formula for calculating the porosity n of loess is
[0053]
[0054] in, is the density of pure water at 4°C, take 1g / cm 3 ; The unit of loess density ρ is g / cm 3 ; Moisture content w is the massmoisture content, %; specific gravity G S is a dimensionless number;
[0055] (2) According to the power function relationship between porosity n and cohesion c, the cohesion value of loess corresponding to porosity n is calculated, and according to porosity n and internal friction angle The relationship to determine the angle of internal friction value;
[0056]The power function relationship between porosity n and cohesion c is c=3.35n -2.82 ;
[0066] Embodiment 2: the loess sample of this embodiment is taken from a certain area in Yan'an;
[0067] A method for calculating loess shear strength based on porosity, the specific steps are as follows:
[0068] (1) Measure the density ρ of remolded soil samples of loess in Yan'an area to be 1.80g / cm 3 , 1.72g / cm 3 , 1.49g / cm 3 and 1.26g / cm 3 , the water content w is 10.01%, and the specific gravity is G S is 2.60, and the calculated porosity n of loess is 0.37, 0.40, 0.48, 0.56 respectively,
[0069] The formula for calculating the porosity n is
[0070]
[0071] in, is the density of pure water at 4°C, take 1g / cm 3 ; The unit of loess density ρ is g / cm 3 ; Moisture content w is the massmoisture content, %; specific gravity G S is a dimensionless number;
[0072] (2) According to the power function relationship between porosity n and cohesion c = 3.35n -2.82 The theoretical values of the cohesion c when the corresponding porosity n is 0.37, 0.40, 0.48, an...
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Abstract
The invention discloses a method for calculating the shear strength of loess based on porosity, and belongs to the technical field of rock engineering. The invention measures the density ρ, water content w and specific gravity G of loess S , calculate the porosity n of the loess; calculate the loess cohesion value corresponding to the porosity n according to the power function relationship between the porosity n and the cohesion c, and determine the internal friction according to the relationship between the porosity n and the internal friction angle The value of the angle is determined; the excess static pore water pressure u is measured, and the shear strength value corresponding to each porosity is calculated according to the calculation formula of loess shear strength based on porosity. The invention can quickly determine loess cohesion, internal friction angle and shear strength parameters according to soil porosity, can provide technical support for the calculation of loess shear strength, and can also provide theoretical reference for engineering construction.
Description
technical field [0001] The invention relates to a method for calculating loess shear strength based on porosity, and belongs to the technical field of rock engineering. Background technique [0002] The shear strength of loess directly affects the progress and effect of engineering construction. At present, scholars at home and abroad have studied dry density, moisture content, dry-wet and freeze-thaw cycles, particle size distribution, plant roots, soil structure, joints and soluble salts, etc. Many studies have been carried out on the influence of factors on the shear strength of loess in different regions and fruitful results have been obtained. [0003] According to the theory of soil mechanics and engineering practice, porosity also has a very important influence on the shear strength of loess. However, there is no research on the effect of porosity on the shear strength of loess. Contents of the invention [0004] In view of the unclear effect of porosity on loess s...
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