Calculation method for determining specific gravity of loose and broken rock-soil body

Abstract

The invention relates to a calculation method for determining the specific gravity of a loose and broken rock-soil body, and belongs to the technical field of rock-soil body specific gravity detection. According to a soil mechanics theory, the specific gravity # imgabs0 # of the loose and broken rock-soil body is equal to the particle density # imgabs1 # of the rock-soil body in numerical value, and a quantitative change rule between the specific gravity # imgabs2 # of the loose and broken rock-soil body and the percentage # imgabs3 # of the loose and broken rock-soil body with the particle size smaller than 2 mm in the total mass is constructed by adopting an inverse proportional function model; the mass percentage content p2 of particles with the particle size smaller than 2 mm in all the particles in the to-be-determined loose and broken rock-soil body is obtained through a particle analysis test; and calculating the specific gravity # imgabs4 # of the loose and broken rock-soil body according to the mass percentage p2 of the particles with the particle size of less than 2mm in all the particles in the loose and broken rock-soil body. The method can quickly and accurately determine the specific gravity of the loose and broken rock-soil body, and solves the problems that an existing method for determining the specific gravity of the loose and broken rock-soil body is time-consuming, labor-consuming, high in cost, complex in determination process and the like.

Description

Technical Field

[0001] The invention relates to a calculation method for determining the specific gravity of loose and broken rock and soil bodies, and belongs to the technical field of specific gravity detection of rock and soil bodies. Background Art

[0002] Specific gravity is one of the three basic physical indicators of rock and soil. It is not only the basic data source for calculating the physical property indicators such as the porosity, porosity, and saturation of rock and soil, but also the basic parameter for the analysis and research of rock and soil seepage, bearing capacity, hydraulic conductivity, shear strength, compressibility / settlement characteristics, and slope stability in practical engineering. It can be seen that the specific gravity of rock and soil is an extremely important engineering geological indicator, which is not only the basic parameter of geological research, but also an important indicator for evaluating the properties of geotechnical engineering in engineering practice. Therefore, the specific gravity of rock and soil directly determines the accuracy and rationality of practical engineering judgment and analysis.

[0003] In the prior art, specific gravity tests are usually used to determine the specific gravity of rock and soil. Different specific gravity test methods are used according to the particle size of the rock and soil, namely: 1) For rock and soil with particle size less than 5 mm, the specific gravity is obtained by the pycnometer method; 2) For rock and soil with a particle size of not less than 5 mm, if the content of particles with a particle size greater than 20 mm is less than 10%, the specific gravity shall be obtained by the floating weighing method; if the content of particles with a particle size greater than 20 mm is not less than 10%, the specific gravity shall be obtained by the siphon tube method; then the average specific gravity of the rock and soil shall be obtained by the following formula: ; In the formula, is the average specific gravity of the rock and soil mass, dimensionless; is the proportion of rock and soil with particle size less than 5 mm in the total mass, %; , The specific gravity of rock and soil with particle size less than 5mm and not less than 5mm respectively, dimensionless.

[0004] However, the existing use of specific gravity tests to determine the specific gravity of rock and soil has the following main problems: 1) The test is time-consuming, labor-intensive and costly. For example, when determining the specific gravity of rock and soil with a particle size of less than 5 mm using the specific gravity bottle method, the specific gravity bottle boiling method is generally used. This method is time-consuming and consumes electricity during boiling, and the specific gravity bottle is easily broken during the boiling process; 2) When using formula (1) to calculate the specific gravity of the rock and soil, the calculation process is cumbersome and time-consuming, which shows that the determination process is complicated.

[0005] In summary, the existing specific gravity test method used to determine the specific gravity of loose and broken rock and soil is time-consuming, labor-intensive, and costly, and the determination process is complicated. Summary of the invention

[0006] In view of the problem that the existing technical methods for determining the specific gravity of loose and broken rock and soil are time-consuming, labor-intensive, costly, and the determination process is complicated, the present invention proposes a calculation method for determining the specific gravity of loose and broken rock and soil. The present invention adopts an inverse proportional function model to construct the specific gravity of loose and broken rock and soil. The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass According to the quantitative change law between the loose and broken rock and soil, the mass percentage of particles with a diameter of less than 2 mm in the total particles is p 2 Calculate the specific gravity of loose and broken rock and soil The present invention can quickly and accurately determine the specific gravity of loose and broken rock and soil.

[0007] A calculation method for determining the specific gravity of loose and broken rock and soil mass, the specific steps are as follows: (1) According to soil mechanics theory, the specific gravity of loose and broken rock and soil is Numerically equal to the particle density of the rock mass , the inverse proportional function model is used to construct the specific gravity of loose and broken rock and soil The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative change law between Figure 1 ),Right now ; ; In the formula, , is a constant, the constant and The results are obtained by fitting the specific gravity test of loose and broken rock and soil. is 0.0287, is 2.5934, then the specific gravity of loose and broken rock and soil is The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative relationship between ; (2) The mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through particle analysis test. 2 ; (3) According to the mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass, 2 Calculate the specific gravity of loose and broken rock and soil .

[0008] In step (1), the mass percentage of particles with a particle size of less than 2 mm in the loose and broken rock and soil mass is p 2The calculation formula is ; In the formula, The mass of particles with a diameter less than 2 mm in the loose and broken rock and soil sample of the particle analysis test, kg; It is the total mass of loose and broken rock and soil samples for particle analysis test, kg.

[0009] The beneficial effects of the present invention are: (1) The present invention aims to solve the problem that the existing technical methods for determining the specific gravity of loose and broken rock and soil are time-consuming, labor-intensive, costly, and the determination process is complicated. The present invention proposes a method for determining the specific gravity of loose and broken rock and soil, which can quickly and accurately determine the specific gravity of loose and broken rock and soil; (2) The present invention only uses conventional particle analysis tests to obtain the content of particles below 2 mm in the particle grading of loose and broken rock and soil, and can directly calculate the corresponding specific gravity of the loose and broken rock and soil. The method is simple and fast, and greatly improves the work efficiency of calculating the specific gravity of the loose and broken rock and soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The specific gravity of loose and broken rock and soil and The relationship diagram of the changes between . DETAILED DESCRIPTION

[0011] The present invention is further described in detail below in conjunction with specific implementation modes, but the protection scope of the present invention is not limited to the described contents. SUMMARY OF THE INVENTION A calculation method for determining the specific gravity of loose and broken rock and soil mass, the specific steps are as follows: (1) According to soil mechanics theory, the specific gravity of loose and broken rock and soil is Numerically equal to the particle density of the rock mass , the inverse proportional function model is used to construct the specific gravity of loose and broken rock and soil The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative change law between Figure 1 ),Right now ; ; In the formula, , is a constant, the constant and The results are obtained by fitting the specific gravity test of loose and broken rock and soil. is 0.0287, is 2.5934, R 2=98.09%; therefore, the specific gravity of loose and broken rock and soil The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative relationship between ; In the formula, is the specific gravity of loose and broken rock and soil mass, dimensionless; It is the mass content of particles below 2 mm in the particle gradation of loose and broken rock and soil, %; The mass percentage of particles with a particle size of less than 2 mm in the loose and broken rock and soil mass is p 2 The calculation formula is ; In the formula, The mass of particles with a diameter less than 2 mm in the loose and broken rock and soil sample of the particle analysis test, kg; is the total mass of the loose and broken rock and soil sample for particle analysis test, Kg; (2) The mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through particle analysis test. 2 ; (3) According to the mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass, 2 Calculate the specific gravity of loose and broken rock and soil .

[0013] Example 1: A method for determining the specific gravity of a loose and broken rock and soil mass, the specific steps are as follows: (1) The mass percentage of particles with a particle size of less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through particle analysis test. 2 15%; (2) According to the mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass, 2 Calculate the specific gravity of loose and broken rock and soil ; ; In the formula, is the specific gravity of loose and broken rock and soil mass, dimensionless; It is the mass content of particles below 2 mm in the particle gradation of loose and broken rock and soil, %; The specific gravity of loose and broken rock and soil in this example The calculated result is 2.78, while the experimental measurement value of the specific gravity of the loose and broken rock and soil in this embodiment is 2.72, with an error rate of 2.38%, which is less than 5%.

[0014] Example 2: A method for determining the specific gravity of a loose and broken rock and soil mass, the specific steps are as follows: (1) The mass percentage of particles with a particle size of less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through particle analysis test. 2 24%; (2) According to the mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass, 2 Calculate the specific gravity of loose and broken rock and soil ; ; In the formula, is the specific gravity of loose and broken rock and soil mass, dimensionless; It is the mass content of particles below 2 mm in the particle gradation of loose and broken rock and soil, %; The specific gravity of loose and broken rock and soil in this example The calculated result is 2.71, while the experimental measurement value of the specific gravity of the loose and broken rock and soil in this embodiment is 2.67, with an error rate of 1.61%, which is less than 5%.

[0015] Example 3: A method for determining the specific gravity of a loose and broken rock and soil mass, the specific steps are as follows: (1) The mass percentage of particles with a particle size of less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through particle analysis test. 2 33%; (2) According to the mass percentage of particles with a diameter of less than 2 mm in the loose and broken rock and soil mass, 2 Calculate the specific gravity of loose and broken rock and soil ; ; In the formula, is the specific gravity of loose and broken rock and soil mass, dimensionless; It is the mass content of particles below 2 mm in the particle gradation of loose and broken rock and soil, %; The specific gravity of loose and broken rock and soil in this example The calculated result is 2.68, while the experimental measurement value of the specific gravity of the loose and broken rock and soil in this embodiment is 2.65, with an error rate of 1.15%, which is less than 5%.

[0016] The present invention only adopts conventional particle analysis test to obtain the content of particles below 2 mm in the particle grading of loose and broken rock and soil, and can directly calculate the corresponding specific gravity of loose and broken rock and soil. The method is simple and fast, and greatly improves the work efficiency of calculating the specific gravity of loose and broken rock and soil.

[0017] The specific implementation modes of the present invention are described in detail above, but the present invention is not limited to the above implementation modes, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A calculation method for determining the specific gravity of loose and broken rock and soil, characterized in that: The specific steps are as follows: (1) According to soil mechanics theory, the specific gravity of loose and broken rock and soil is Numerically equal to the particle density of the rock mass , the inverse proportional function model is used to construct the specific gravity of loose and broken rock and soil The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative change law between ； ； In the formula, , is a constant, the constant and The results are obtained by fitting the specific gravity test of loose and broken rock and soil. is 0.0287, is 2.5934, then the specific gravity of loose and broken rock and soil is The percentage of loose and broken rock and soil with a particle size less than 2 mm in the total mass The quantitative relationship between ； (2) The mass percentage content p2 of particles with a particle size less than 2 mm in the loose and broken rock and soil mass to be determined is obtained through a particle analysis test; (3) Calculate the specific gravity of loose and broken rock and soil based on the mass percentage of particles with a diameter less than 2 mm in the loose and broken rock and soil, p2. .

2. The calculation method for determining the specific gravity of loose and broken rock and soil mass according to claim 1 is characterized by: Step (1) The calculation formula for the mass percentage content p2 of particles with a particle size less than 2 mm in the loose and broken rock and soil mass is: ； In the formula, The mass of particles with a diameter less than 2 mm in the loose and broken rock and soil sample of the particle analysis test, kg; It is the total mass of loose and broken rock and soil samples for particle analysis test, kg.

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