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Dynamic response analysis method for saturated soil-group pile-upper structure system

A technology of dynamic response and analysis methods, applied in special data processing applications, instruments, electrical digital data processing, etc.

Active Publication Date: 2018-11-23
BEIJING UNIV OF TECH
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In the domestic and foreign published patent and non-patent literature retrieved this time, there is no report with the same content as the overall research and development of this project

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  • Dynamic response analysis method for saturated soil-group pile-upper structure system
  • Dynamic response analysis method for saturated soil-group pile-upper structure system
  • Dynamic response analysis method for saturated soil-group pile-upper structure system

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Embodiment Construction

[0278] 1.1 Mechanical model and basic assumptions

[0279] Computational models such as figure 1 In the column coordinate system shown, an i×j-type pile group and a superstructure are connected by a rigid cap, and the saturated soil around the pile constitutes a saturated soil-pile group-superstructure interaction system. In addition, the base of the pile and saturated soil is tightly connected to the rigid bedrock, which is Vertical movement in the form of ( and ω is the circular frequency). The material parameters of saturated soil and structure are shown in Table 1.

[0280] Table 1 Soil and structural material parameters

[0281]

[0282]

[0283] 1.2 Saturated soil motion equation and solution

[0284] Using Boer porous media theory to describe the dynamic behavior of saturated soil, the equation of motion is

[0285]

[0286]

[0287]

[0288] where S v =n f ρ f g / k f is the liquid-solid coupling coefficient of the soil; u s and u f represent...

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Abstract

The invention relates to a dynamic response analysis method for a saturated soil-group pile-upper structure system, and belongs to the technical field of pile foundation mechanical analysis. Accordingto a porous media theory established by de Boer based on a continuum mixture axiom and a volume fraction concept, by utilizing the volume fraction concept, a plurality of microscopic properties can be described directly through macroscopic properties, and complex formulae in a hybrid mixture theory are avoided. The porous media theory established by the de Boer not only conforms to continuum mechanics and thermodynamics principles, but also has numerous advantages which a Biot theory does not have. In addition, for the situation that the research of pile-soil-upper structure dynamic interaction is limited to single-phase soil, little saturated soil is involved. Due to the existence of a liquid phase, the propagation and dissipation of energy and waves in the saturated soil and the single-phase soil are different; the influences of the filtering and amplifying effects of a soil layer on seismic waves under the action of seismic loads on structure seismic response characteristics are different; and the method is of great practical significance.

Description

technical field [0001] The invention relates to a dynamic response analysis method of a saturated soil-pile group-superstructure system, in particular to a dynamic response analysis method of a saturated soil-pile group-superstructure system under the vertical movement of bedrock, and belongs to the technical field of pile foundation mechanics analysis . Background technique [0002] At present, in actual engineering, pile foundations mostly appear in the form of pile groups. In this case, the influence of "pile group effect" must be considered. Pile groups are often used to support the superstructure, so saturated soil, pile groups, and superstructure constitute an interactive system rich in research significance. Moreover, in addition to the common direct load, the load it receives will also be affected by ground motion in some cases. According to the retrieval, most of the studies on saturated soil-pile dynamic interaction are carried out based on the Biot saturated soi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F2119/06
Inventor 许成顺崔春义张石平梁志孟孟坤
Owner BEIJING UNIV OF TECH
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