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Tangent modulus correcting method for non-linear sedimentation computation of foundation

A technology of tangent modulus and foundation, which is applied in the field of calculation of foundation and foundation settlement in foundation engineering, to achieve the effect of reliable source of parameters, accurate calculation results, and simplified survey methods

Inactive Publication Date: 2008-07-16
CHINA THREE GORGES UNIV
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Problems solved by technology

At present, there is no settlement calculation method that can perfectly solve the above three key problems or one of the problems. The present invention solves these three problems well based on the in-situ test results

Method used

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  • Tangent modulus correcting method for non-linear sedimentation computation of foundation
  • Tangent modulus correcting method for non-linear sedimentation computation of foundation
  • Tangent modulus correcting method for non-linear sedimentation computation of foundation

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Experimental program
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Embodiment Construction

[0047] 1) Program implementation

[0048] This method needs the computer programming that can realize above-mentioned algorithm by using MATLAB7.0 or other computer language by special calculation program, calculation step is:

[0049] (1) Input the measured data (p i ,s i ), using the least squares method to carry out hyperbolic fitting to the data;

[0050] (2) output hyperbolic fitting parameters a, b;

[0051] (3) Calculate the additional stress distribution in the foundation under various loads;

[0052] (4) Select the convergence step size of the additional stress correction coefficient β, and apply the foundation settlement formula (5) to iteratively solve the foundation settlement under all levels of load until the calculated settlement and load of the compression plate under the final load (or a certain level of load) The actual settlement of the test is approximately equal, and the output β;

[0053] (5) Calculate the corrected tangent modulus of any test point ...

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Abstract

A revised equation for tangent modulus of the foundation soil of a certain soil layer is obtained by making use of load test result which is subject to hyperbolic curve fitting. The equation is as follows: EI equals to (1-Beta bpz)<2>E0 / Beta or EI equals to (1-Beta Rf / pzpu)<2>E0 / Beta. Next, the revised tangent modulus of each stratified soil in different depth of the soil layer is determined according to a standard penetration test or other in situ testing the test parameters of which are assumed according to linear dependence relation; finally, the results of the nonlinearity sedimentation of large-area foundation or the base are obtained according to a layerwise summation method. The method is characterized in that the invention can make analysis of the whole process of the nonlinearity sedimentation to the limit state, the calculation principle is simple, calculation parameter source is reliable, subsidiary stress is revised according to the test result of plate loading test and the calculating result is accurate; the invention can be widely used in the design of various foundation engineering with the aim of settlement control in civil engineering field.

Description

1. Technical field [0001] The invention relates to the settlement calculation problem of foundation and foundation in foundation engineering, and belongs to the field of civil engineering. 2. Background technology [0002] Calculation of foundation settlement is the core issue of foundation engineering design, and it is also a worldwide problem that has not been satisfactorily resolved so far. At present, the normative method with compressive modulus as the calculation index is widely used in our country. This method calculates the total settlement of the foundation according to the layered sum method and corrects the calculation results according to experience. The compressive modulus is obtained based on the indoor compression test of soil samples. Due to the influence of sampling disturbance and other factors, it is quite different from the actual undisturbed soil, resulting in low precision and poor reliability of the calculation results. Therefore, a settlement calculat...

Claims

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Application Information

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IPC IPC(8): E02D33/00E02D1/00G06F17/00G06F19/00
Inventor 李仁平
Owner CHINA THREE GORGES UNIV
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