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Construction method of modified Davidenkov constitutive model

A technology of constitutive model and construction method, applied in the field of geotechnical engineering, which can solve the problems of large energy consumption of soil, consideration of soil damping ratio D, etc.

Pending Publication Date: 2022-04-15
HEBEI INSTITUTE OF ARCHITECTURE AND CIVIL ENGINEERING
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Problems solved by technology

[0005] So far, although some scholars have improved the Davidenkov constitutive model, they have not considered the damping ratio D of the soil, so that the calculated damping ratio is greater than the experimentally measured damping ratio, and the energy consumption of the soil is also greater than the actual energy consumption

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  • Construction method of modified Davidenkov constitutive model
  • Construction method of modified Davidenkov constitutive model
  • Construction method of modified Davidenkov constitutive model

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Experimental program
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Effect test

Embodiment 1

[0109] (1) Composition:

[0110] Taking two soft soil samples as the research object, the hysteretic curve, dynamic shear modulus ratio curve, damping ratio curve, acceleration amplification factor and Surface acceleration, and the rationality and feasibility of the modified Davidenkov constitutive model in this paper are verified by comparing the finite element simulation results with the test results. The parameters of soft soil samples are shown in Table 1, and the different loading paths are as follows image 3 , 4 , 5, the application of ground motion is shown in Table 2, and the acceleration time-history curves of EL-Centro waves and Kobe waves are shown in Image 6 , 7 As shown, the acceleration response spectrum curve is as Figure 8 shown.

[0111] Table 1 Soil sample parameters

[0112]

[0113] Table 2 Conditions of applying seismic waves

[0114]

[0115]

[0116] (2) Effect:

[0117] The hysteresis curves of soil sample 2 under the action of diffe...

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Abstract

The invention discloses a construction method of a modified Davidenkov constitutive model. The construction method comprises the following steps: S1, introducing a concept of a damping ratio degradation coefficient into a Davidenkov constitutive model represented by a piecewise function; s2, deriving a dynamic stress-strain skeleton curve formula and a hysteretic curve formula for correcting the Davidenkov constitutive model; and S3, deriving a damping ratio degradation coefficient, a damping ratio and a dynamic shear modulus formula of the corrected Davidenkov constitutive model based on the corrected Davidenkov stress-strain hysteretic curve. According to the method, the concept of'damping ratio degradation coefficient 'is introduced on the basis that the Davidenkov constitutive model is represented by the piecewise function, so that the advantages of the Davidenkov constitutive model represented by the piecewise function are inherited: the shear stress of a stress-strain skeleton curve is no longer infinitely increased along with the shear strain; and the phenomenon that the damping ratio calculated through a Davidenkov stress-strain hysteretic curve is larger than the actual damping ratio of the soil body is improved, the energy consumption condition of the soil body is reflected more truly, and a reasonable and feasible constitutive model is provided for subsequent research.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, in particular to a method for constructing a modified Davidenkov constitutive model. Background technique [0002] Soil is a three-phase heterogeneous medium composed of soil particles, water and air, with complex microstructure and mechanical properties. At present, according to site conditions and engineering requirements, scholars will selectively discard some secondary factors and focus on the main factors to establish the dynamic constitutive model of soil. Among the hundreds of soil constitutive models that have been proposed, almost none of them can perfectly consider all the properties of the soil and be applied to all types of soils. At this stage, the soil constitutive models can be roughly divided into elastic models, viscous models Elastic and elastoplastic models. [0003] The viscoelastic model is composed of skeleton curve and hysteretic curve, reflecting the whole process...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F119/14
Inventor 谢军庞京京张斌阎杰黄久鹏郭飞王贺贺张华帅梁金晓王政罗岩赖镇泉陆超王啸天邢国斌王丽君于旭涛
Owner HEBEI INSTITUTE OF ARCHITECTURE AND CIVIL ENGINEERING