Numerical analysis method for stability of pole tower base on unsaturated expansive soil foundation

Abstract

The invention discloses a numerical analysis method for stability of a pole tower base on unsaturated expansive soil foundation. According to the method, firstly, a pole tower base model and an unsaturated expansive soil foundation model are created; secondly, corresponding material properties are set for the pole tower base model and the unsaturated expansive soil foundation model respectively; thirdly, correlative analysis procedures are established, grid partition is carried out on the pole tower base model and the unsaturated expansive soil foundation model, boundary conditions for constraining the displacement of the bottom and the periphery of the unsaturated expansive soil foundation model are set, and gravity load and corresponding load on the upper portion of the pole tower base model are applied; finally, operation is submitted, and an operation result is analyzed. The method easily and effectively solves the problems that the pole tower base of an electric transmission lineis deformed and the stability is influenced since the water content rate of the unsaturated expansive soil foundation is changed; the bearing force of the unsaturated expansive soil foundation after the water content rate is changed can be obtained, and the numerical analysis method is provided for determining the stability of the pole tower base on the unsaturated expansive soil foundation.

Description

technical field [0001] The invention belongs to the technical field of engineering application and computational soil mechanics, and in particular relates to a numerical analysis method for the stability of a tower foundation on an unsaturated expansive soil foundation. Background technique [0002] Expansive soil is a kind of highly plastic clay composed of strongly hydrophilic minerals (montmorillonite and illite), which has the characteristics of water absorption expansion and water loss shrinkage. It is extremely sensitive to environmental and climatic conditions, and its strength decreases significantly after soaking, thus causing huge safety hazards to buildings and structures on expansive soil foundations. Expansive soils are distributed in many countries around the world, and expansive soils are widely distributed in my country, from Henan and Hebei to Guangxi and Yunnan in the southwest, and expansive soils are distributed to varying degrees. Most of these areas be...

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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to address the deficiencies in the prior art and provide a numerical analysis method for the stability of tower foundations on unsaturated expansive soil foundations, which solves the problems of transmission lines caused by changes in moisture content in unsaturated expansive soil foundations. Deformation and stability of tower foundations, and obtain the bearing capacity of unsaturated expansive soil foundation after water content changes, and provide a numerical analysis method for determining the stability of tower foundations on unsaturated expansive soil foundations

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