CN-116296897-B - Soil shear strength calculation method and device based on normal stiffness in particles

CN116296897BCN 116296897 BCN116296897 BCN 116296897BCN-116296897-B

Abstract

The invention discloses a soil shear strength calculation method and device based on normal stiffness in a particle, and the method mainly comprises the steps of obtaining shear strength parameters corresponding to normal contact stiffness of different particles, obtaining a plurality of data pairs, fitting the data pairs to obtain a relation curve of the normal contact stiffness of the particle in the soil and the shear strength parameters, obtaining axial stress of the particle in the soil to be measured, determining the normal contact stiffness of the particle, and obtaining the shear strength parameters of the soil to be measured according to the relation curve of the normal contact stiffness of the particle in the soil and the shear strength parameters. The invention can break through the limitation of conventional indoor geotechnical test and soil mechanics macroscopic solely research, rapidly and accurately calculate the loess shear strength parameter, and provide accurate and reliable data parameters for highway engineering high slope stability calculation.

Inventors

AN LIANG
ZHAO TIANYU
DING JIANQIANG
WANG WEIFENG
Li Lunji
WANG FEI

Assignees

甘肃省交通规划勘察设计院股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230324

Claims (5)

1. The soil shear strength calculation method based on the normal rigidity of the interior of the particles is characterized by comprising the following steps: Obtaining shear strength parameters corresponding to normal contact stiffness of different particles, obtaining a plurality of data pairs, and fitting the data pairs to obtain a relation curve of normal contact stiffness and shear strength parameters of the particles in the soil body; obtaining the axial stress of the soil particles to be measured, determining the normal contact stiffness of the soil particles to be measured, In the formula, Is the normal contact stiffness of the particles; is axial stress; alpha is the included angle between the long axis of the particle and the horizontal direction, beta is the included angle between the shearing stress surfaces, and L is the long axis of the particle; The axial stress is obtained by the following formula: In the formula, The soil body weight is given, and h is the soil body sampling depth; the lateral stress is obtained by the following formula: In the formula, Is a consolidation ratio, wherein, , Is the internal friction angle of the soil body; and obtaining the shear strength parameter of the soil to be measured according to the relation curve of the normal contact stiffness and the shear strength parameter of the soil internal particles.
2. The method for calculating the shear strength of the soil based on the normal stiffness inside the particles according to claim 1, wherein when the soil is aeolian loess, α is 90 °, and when the soil is aeolian loess, α is 0 °.
3. The method for calculating the shear strength of the soil based on the normal stiffness in the granules according to claim 1, wherein the shear strength parameters comprise the cohesive force and the internal friction angle of the soil.
4. Soil shear strength calculation device based on inside normal rigidity of granule, characterized by, include: The soil internal rigidity acquisition unit is used for acquiring the normal contact rigidity of the soil particles according to the sampling depth of the soil particles and the stress parameters among the soil particles; the soil body shear strength parameter obtaining unit is used for storing the relation curve of the normal contact stiffness and the shear strength parameter of the soil body internal particles according to any one of claims 1-3, and is used for receiving the normal contact stiffness of the soil body particles and obtaining the shear strength parameter of the soil body according to the relation curve.
5. The soil shear strength calculation device based on the normal stiffness of the interior of the soil body according to claim 4, further comprising a parameter setting unit for setting stress parameters among the soil body particles according to the soil body type.

Description

Soil shear strength calculation method and device based on normal stiffness in particles Technical Field The invention relates to the technical field of geotechnical engineering, in particular to a soil shear strength calculation method and device based on normal rigidity in particles. Background The shear strength of the soil body directly influences the progress and effect of engineering construction. At present, scholars at home and abroad develop a great deal of researches on the influence of macroscopic factors such as water content, dry density, dry-wet freeze thawing cycle and the like on the shear strength of soil layers in different areas, and acquire a great deal of research results. However, according to the theory of mechanics of particulate matters, rockfill, debris flow, landslide, soil mass and the like are typical particulate matter systems in nature, and many statics and dynamics of the particulate systems cannot be well explained by general theory of solid mechanics, theory of fluid mechanics and physics of aggregation. In the prior art, the shear strength parameter is generally obtained through an indoor direct shear test, but the shear strength parameter obtained through the indoor direct shear test has larger difference with the stress condition in an actual highway engineering slope, and in loess slope stability calculation, the shear strength parameter obtained through the indoor test is not representative, so that the shear strength parameter is selected based on an engineering geological analogy method in the current loess slope stability calculation process, and the reference significance value of the parameter obtained through the indoor direct shear test is low. Therefore, aiming at the defects, the invention provides a soil shear strength calculation method and device based on the normal rigidity of the interior of the particles based on the formation of the particle flow simulation soil shear band so as to break through the limitations of conventional indoor geotechnical tests and soil mechanics macroscopic only image researches. Disclosure of Invention In view of the above, the application provides a soil shear strength calculation method and device based on normal stiffness in the soil body from the viewpoint of real stress of soil sampling depth, which not only solves the problem that the interaction of microscopic particles in the soil body and macroscopic particle system mechanical behaviors are not explicitly and essentially linked, but also can rapidly and accurately calculate loess shear strength parameters compared with an indoor direct shear test, thereby providing accurate and reliable data parameters for highway engineering high slope stability calculation. In order to achieve the above purpose, the present invention adopts the following technical scheme: A soil shear strength calculation method based on normal rigidity in particles comprises the following steps: Obtaining shear strength parameters corresponding to normal contact stiffness of different particles, obtaining a plurality of data pairs, and fitting the data pairs to obtain a relation curve of normal contact stiffness and shear strength parameters of the particles in the soil body; And obtaining the axial stress of the soil body particles to be measured, determining the normal contact stiffness of the particles, and obtaining the shear strength parameters of the soil body to be measured according to the relation curve of the normal contact stiffness of the particles in the soil body and the shear strength parameters. Preferably, the normal contact stiffness is determined as follows: Wherein k n is the normal contact stiffness of the particles, sigma 1 is the axial stress, sigma 3 is the lateral stress, alpha is the included angle between the long axis of the particles and the horizontal direction, beta is the included angle between the shear stress surfaces, and L is the long axis of the particles. Preferably, α is 90 ° when the soil body is aeolian loess, and is 0 ° when the soil body is alluvial loess. Preferably, the axial stress is obtained by the following formula: σ1=γh Wherein gamma is the soil body weight, and h is the soil body sampling depth. Preferably, the lateral stress is obtained by the following formula: wherein K c is the consolidation ratio, wherein, Is the internal friction angle of the soil body. Preferably, the shear strength parameters include soil cohesion and internal friction angle. On the other hand, the application also discloses a soil shear strength calculating device based on the normal rigidity of the interior of the particles, which comprises: the soil body internal rigidity acquisition unit is used for acquiring the normal contact rigidity of soil body particles according to the soil body sampling depth and the soil body particle stress parameters; And the soil shear strength parameter acquisition unit is used for storing the relation curve of the normal contact stiffness