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A method for obtaining the degree of compaction of subgrade soil under compaction

A technology of subgrade soil and compaction, which is applied in the preparation of test samples, the use of one-time impact force to test the strength of materials, and the use of stable tension/compression to test the strength of materials, etc.

Active Publication Date: 2022-06-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In actual engineering, different compaction types (static compaction, vibratory compaction, etc.) The selection is very empirical

Method used

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  • A method for obtaining the degree of compaction of subgrade soil under compaction
  • A method for obtaining the degree of compaction of subgrade soil under compaction
  • A method for obtaining the degree of compaction of subgrade soil under compaction

Examples

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Embodiment 1

[0043] The subgrade soil of a certain road is coarse-grained sandy soil, the measured gradation is shown in Table 1, and the optimum moisture content is 10.5%. A discrete element subgrade soil model of 0.3m×2.5m×2.5m was established in PFC3D software. The model gradation and microscopic parameters are shown in Table 2 and Table 3. The initial porosity before compaction is 43%. The kn and ks values ​​of each boundary wall of the subgrade soil model are consistent with the soil kn and ks values. The kn and ks values ​​of the walls generated after the pressure roller model is imported are taken as 10 times the soil kn and ks values.

[0044] Table 1 Actual gradation of coarse-grained sand

[0045]

[0046] Table 2 Ball gradation in the discrete element model of coarse-grained sand

[0047] Particle size (mm) 15 22 28 / 25 44 Proportion(%) 1.4 21.7 45.6 29.0 2.3

[0048] Table 3 Microscopic parameters in the discrete element model of coarse-grained...

Embodiment 2

[0056] A subgrade soil is silty clay, the measured gradation is shown in Table 5, and the optimum moisture content is 13.5%. A discrete element subgrade soil model of 0.3m×2.5m×2.5m was established in PFC3D software. The model gradation and microscopic parameters are shown in Tables 6 and 7. The initial porosity before compaction is 48%. The kn and ks values ​​of each boundary wall of the subgrade soil model are consistent with the soil kn and ks values. The kn and ks values ​​of the walls generated after the pressure roller model is imported are taken as 10 times the soil kn and ks values.

[0057] Table 5 Actual gradation of silty clay

[0058] Particle size (mm) Below 0.075 0.075-0.25 0.25-0.5 0.5—1 1—2 2—5 Proportion(%) 56.6 13.9 12.7 7.7 7.2 1.9

[0059] Table 6 Ball gradation in the discrete element model of silty clay

[0060] Particle size (mm) 15 22 28 / 25 44 Proportion(%) 1.4 21.7 45.6 29.0 2.3

[0061] ...

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Abstract

The invention discloses a method for obtaining the degree of compaction of subgrade soil under compaction, which includes the following steps: (1) The test simulation of the maximum dry density of subgrade soil can be divided into fine-grained soil compaction tests according to the type of subgrade soil There are two types of simulation and coarse-grained soil shaking table test simulation; (2) The simulation of subgrade soil compaction process can be divided into static compaction and vibration compaction according to the type of compaction; (3) Acquisition of subgrade soil compaction degree , considering the difference between the maximum dry density of the built subgrade soil discrete element model and the measured maximum dry density of subgrade soil, the compaction degree in this step is the same as the maximum obtained in the simulation test in step (1). Calculated from the dry density ratio. A method for obtaining the degree of compaction of subgrade soil under the action of compaction disclosed by the present invention is to import the model built by the modeling software SolidWorks into the discrete element software PFC3D, and finally obtain the degree of compaction of the subgrade soil through the simulation of the compaction process .

Description

technical field [0001] The invention relates to a method for obtaining the compaction degree of roadbed soil under compaction, which belongs to the field of road engineering. Background technique [0002] The discrete element method is suitable for the numerical simulation of various discontinuous media. For discontinuous media such as subgrade soil, it can better simulate its changes under external action. The characterization of compaction degree is an indicator of road compaction quality. In actual engineering, each layer of the road reaches the design compaction degree, which is the basic guarantee of road bearing capacity. In practical engineering, different compaction types (static compaction, vibration compaction, etc.) should be used for different subgrade soils (fine-grained soil, coarse-grained soil, etc.), and different compaction parameters should be used, but this The selection is very empirical. SUMMARY OF THE INVENTION [0003] Purpose of the invention: Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N3/30G01N1/28G06F30/23
CPCG01N3/08G01N3/30G01N1/286
Inventor 马涛范剑伟朱雅婧张军辉罗桑朱湘
Owner SOUTHEAST UNIV
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