Prediction Method of Large Deformation Settlement Process of Multilayer Horizontal Vacuum Strengthened Dredger Fill Soft Soil

Abstract

The invention belongs to the related technical field of geotechnical engineering research and discloses a prediction method of a large deformation settlement process of multi-layer horizontal vacuum reinforcing blow-filling soft soil. The prediction method comprises the following steps that, (1), parameters and boundary conditions of a soil model of the soft soil are set; (2), the placing positionof the horizontal drainage board and vacuum pressure are set; (3), the soil model is divided into units, and the initial and final void ratio of the units are calculated; (4), the height, total stress, effective stress, permeability coefficient, pore water pressure, total head and seepage velocity of the units are calculated in sequence; (5), the time increment is superimposed with the current consolidation time to obtain the new total consolidation time; (6), the hydraulic gradient at the vacuum boundary is calculated; (7), the current settlement amount is calculated; and (8), whether the end condition is reached or not is determined, if so, a parameter change result is output in the consolidation process, and if not, the next step goes to the step (4). According to the prediction method, various factors are comprehensively considered, the prediction precision is improved, and the flexibility is good.

Description

technical field [0001] The invention belongs to the related technical field of geotechnical engineering research, and more specifically relates to a method for predicting the large deformation settlement process of multi-layer horizontal vacuum reinforcement dredging soft soil. Background technique [0002] Soft soils are widely distributed along the rivers and coasts of our country, and these soft soils are generally economically developed areas. These areas have a very urgent need for road traffic, especially the development of expressways. Soft soil has the characteristics of high natural moisture content, large natural void ratio, large disturbance, poor water permeability, complex layered distribution of soil layers, and large differences in physical and mechanical properties between layers, which is not conducive to engineering safety. Soft soil is used as the foundation ground treatment is required. At present, the most commonly used method for dealing with soft soil...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a method for predicting the large deformation settlement process of multi-layer horizontal vacuum reinforcement dredging soft soil, which comprehensively considers the self-weight of the soil, large strain, geometric nonlinearity, Factors such as material parameter nonlinearity and multi-layer vacuum prediction can effectively and accurately predict the consolidation process of saturated soft soil when laying multi-layer horizontal drainage boards for vacuum preloading. Linearity and nonlinearity of material parameters lead to large errors in calculation results and are difficult to apply in complex engineering environments

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