A method for predicting the settlement process of saturated soft soil consolidated by vertical drainage board

Abstract

The invention discloses a vertical drainage plate consolidation saturated soft soil settlement process prediction method, which belongs to the research field of foundation treatment technology in geotechnical engineering. Considering the large deformation, the nonlinearity of material parameters, the boundary conditions, the time-varying vacuum load and surcharge, the unloading/reloading, the non-penetration of the shaft, the loss of vacuum along the well, the non-Darcy flow, the vertical and radial two-dimensional seepage flow and so on, the error is effectively reduced and the calculation precision is improved. The advantage of the method is more obvious for large strain problems. At the same time, the prediction method is simple and flexible, and the constitutive relation can be set flexibly according to the user's wishes, which solves the problems of incomplete considerations and inappropriate material parameters, which lead to large error in calculation results and difficult to beapplied in complex engineering environment. Therefore, the invention can be used for assisting the experimental research of a scientific research unit and predicting the consolidation of the engineering site.

Description

technical field [0001] The invention belongs to the research field of foundation treatment technology in geotechnical engineering, and more specifically relates to a method for predicting the settlement process of saturated soft soil consolidated by vertical drainage boards. Background technique [0002] Soft soils of various origins are widely distributed in my country's coastal areas and other areas. To build structures on soft soil foundations, reinforcement measures must be taken in advance to make the foundations meet the strength requirements, deformation requirements, stability requirements, and water permeability requirements. Drainage consolidation method is one of the commonly used methods to deal with soft soil foundation. The vertical drainage method sets vertical drainage channels such as plastic drainage boards, sand wells, or bagged sand wells in the foundation, and then carries out preloading or combined vacuum preloading to accelerate the discharge of pore w...

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Problems solved by technology

[0003] At present, relevant technical personnel in this field have done some research, and most of them calculate the settlement process of the corresponding vertical drainage plate consolidation saturated soft soil by using different analytical methods. The influential ones are such as Indraratna 2005 analytical solution, Rujikiatkamjorn 2007 Analytical solution, Geng 2012 analytical solution, but these analytical solutions have quite a lot of assumptions, and cannot simultaneously consider large deformation, material parameter nonlinearity, time-varying vacuum load and heap load, unloading / reloading, shaft not pierced , vacuum loss along the well, non-Darcy flow, vertical and radial two-dimensional seepage and other factors, so the application in actual engineering will produce large errors; there are also some commercial finite element software modeling analysis methods, but the finite element The analysis is not flexible enough in the choice of constitutive relation parameters, so it often cannot meet the needs of users

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