Preparation method of clay model foundation capable of recovering prototype state and strength

Abstract

The invention discloses a preparation method of a clay model foundation capable of recovering a prototype state and strength. The preparation method comprises the steps of determining the total thickness and layering of a prototype foundation and a model foundation; obtaining the undrained shear strength of each layer of soil body of the prototype foundation; calculating to obtain state parameters of the middle part of each layer of soil body of the prototype foundation and average effective consolidation pressure stress of each layer of soil body of the model foundation; determining an indoor compression consolidation line slope and an unloading rebound line slope of the soil body of the prototype foundation, and obtaining an initial void ratio of each layer of soil body of the model foundation through backstepping; and carrying out layered preparation of the model foundation. On the premise of restoring the state and strength of the prototype foundation, the economical efficiency and operability of model foundation preparation are improved, the model foundation preparation range is expanded, the problem of sensor dislocation possibly occurring in the centrifugal model preparation process is solved, the economical efficiency of model preparation and the flexibility of sensor arrangement are improved, and the accuracy of the centrifugal model test is ensured.

Description

technical field [0001] The invention belongs to the technical field of physical model test theory, and in particular relates to a method for preparing a clay model foundation for restoring prototype state and strength. [0002] technical background [0003] There are a large number of soft clay foundations in my country's engineering construction, and most of the soft clay foundations are distributed in the southeastern coastal areas of my country such as the Pearl River Delta and the Yangtze River Delta. These areas have relatively developed economies and a large number of infrastructures have been built or are under construction. However, due to the high natural water content of soft clay itself, large void ratio, sensitivity, thixotropy, poor permeability, obvious structural properties, low shear strength, and poor physical and mechanical properties, the clay foundation loses Stability failures and the like occur from time to time. Therefore, if the foundation bearing cap...

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Problems solved by technology

[0011] In order to solve the problem of preparing the clay model foundation in the large-scale problem of the prototype site simulated by the high-gravity physical model test, the invention discloses a method for preparing the clay model foundation to restore the prototype state and strength. The basic idea is to control the clay model foundation The strength, stress state and density are equivalent to those of the prototype foundation soil under the same stress field, so that the centrifugal test results of the model foundation are the true response to the prototype foundation

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