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Method for estimating soft soil consolidation coefficient based on one-dimensional equal strain and stress relaxation tests

A technology of secondary consolidation coefficient and stress relaxation, which is used in soil material testing, material inspection products, etc., to achieve the effect of saving test costs and time costs, high efficiency, and accurate measurement results

Inactive Publication Date: 2015-12-23
CHINA UNIV OF MINING & TECH
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  • Description
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Problems solved by technology

This patent is based on the traditional consolidation test to measure the secondary consolidation coefficient of the soil. The creep time under each level of load is much longer than 24 hours, and the whole time is much longer than 2 weeks, which cannot avoid the shortcoming of long test time.

Method used

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  • Method for estimating soft soil consolidation coefficient based on one-dimensional equal strain and stress relaxation tests
  • Method for estimating soft soil consolidation coefficient based on one-dimensional equal strain and stress relaxation tests
  • Method for estimating soft soil consolidation coefficient based on one-dimensional equal strain and stress relaxation tests

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specific Embodiment 1

[0025] Using the above method to predict and analyze the secondary consolidation coefficient of Berthierville natural soft soil, the initial void ratio of the soft soil in this area is 1.73, and the liquid limit and plastic limit are 43% and 22% respectively. An embankment needs to be built on this site. In order to analyze the long-term deformation and stability of the embankment, it is necessary to understand the rheological properties of the soil. Since the conventional creep test takes a long time, it takes a high time cost to determine the secondary consolidation coefficient by conventional methods.

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Abstract

The invention discloses a method for estimating the soft soil consolidation coefficient based on one-dimensional equal strain and stress relaxation tests, and is applied to water and soil conservation and administration. The method comprises the following steps of firstly, carrying out a one-dimensional equal strain rate test until the target load is reached, thus obtaining the compression index of soil; then carrying out a stress relaxation test to obtain the stress relaxation coefficient of soil; and calculating the consolidation coefficient through the relation between the consolidation coefficient, compression index and stress relaxation coefficient. The method disclosed by the invention has the advantages of being simple and consuming short time, saving test cost and time cost, improving the test efficiency and parameter determination.

Description

technical field [0001] The invention relates to a method for estimating the secondary consolidation coefficient of soft soil, and is especially suitable for the method for estimating the secondary consolidation coefficient of soft soil based on one-dimensional equal strain and stress relaxation tests used in water and soil control. Background technique [0002] In recent years, more and more land reclamation projects are faced with rheological problems of soft soil foundations. The research on the rheological model of soft soil and the determination of its parameters are beneficial to understand the rheological characteristics of soft soil and guide engineering practice. Secondary consolidation coefficients are often used as rheological parameters in rheological models, which are determined from one-dimensional creep tests. The conventional creep test uses a stress-controlled consolidation instrument, which is carried out by step-by-step loading and 24-hour stabilization met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 朱启银周国庆陈拓商翔宇王建州梁恒昌赵光思
Owner CHINA UNIV OF MINING & TECH
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