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Foundation bearing capacity reliability design method and device based on basic width critical value

A foundation bearing capacity and design method technology, applied in the field of geotechnical engineering design, can solve problems such as complex process, large amount of calculation, unknown adjustment range and reasonable adjustment distance, etc., so as to simplify the design process, achieve accurate calculation results, and improve design efficiency effect

Pending Publication Date: 2022-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantage of this method is that Monte Carlo simulation needs to be repeated, and the adjustment range and reasonable adjustment distance of the design value of the foundation width are unknown, the calculation amount is large, and the process is complicated

Method used

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  • Foundation bearing capacity reliability design method and device based on basic width critical value
  • Foundation bearing capacity reliability design method and device based on basic width critical value
  • Foundation bearing capacity reliability design method and device based on basic width critical value

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Embodiment 1

[0084] In the first embodiment, the foundation depth is selected as D b = 2m, uniformly distributed load q = 350kPa, the weight of the foundation soil above and below the bottom surface of the foundation is γ 1 =9kN / m 3 = and gamma 2 =19kN / m 3 . The cohesion of the soil and the tangent of the internal friction angle obey the normal distribution, where the mean value of the cohesion μ c =20kPa, standard deviation σ c =4kPa, the average value of tangent of internal friction angle standard deviation The target reliability index is β T = 3.7, the corresponding failure probability is P T =1.078×10 -4 . It is required to design the foundation width B so that it meets the target reliability (failure probability).

[0085] The method for designing the reliability of foundation bearing capacity based on the foundation width critical value of the present invention is used to design the foundation width, which specifically includes the following steps:

[0086] (1) In order...

Embodiment 2

[0097] The second embodiment provides an efficient and accurate device for designing the reliability of foundation bearing capacity based on the foundation width critical value reliability design method. The device includes a sample size determination unit, a sampling unit, a foundation width critical value calculation unit, and a sorting unit. part, serial number determination part, base width design value determination part, input display part and control part.

[0098] The sample size determining part determines the number of Monte Carlo samples according to the target failure probability;

[0099] The sampling department conducts random sampling according to the determined sample size and statistical characteristics of random variables;

[0100] The base width critical value calculation unit calculates the base width critical value B corresponding to each sample i ; Concretely include the following process:

[0101] For each drawn sample X i , through deterministic anal...

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Abstract

According to the foundation bearing capacity reliability design method and device based on the foundation width critical value, the foundation width meeting the target reliability index and the failure probability can be rapidly and accurately designed. The foundation bearing capacity reliability design method based on the basic width critical value comprises the steps: 1, determining the number of Monte Carlo samples according to the target failure probability; 2, performing random sampling according to the step 1 and the statistical characteristics of the random variables; 3, calculating a basic width critical value Bi corresponding to each sample; 4, storing the basic width critical values of all the samples obtained in the step 3 in a list, and sorting the numerical values in the list from small to large to obtain a new basic width critical value set; 5, determining a serial number k which meets the requirement and is equal to n(1-PT); 6, taking the basic width critical value Bk corresponding to the k-th sample as a final basic width design value.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering design, and in particular relates to a foundation bearing capacity reliability design method and device based on a foundation width critical value. Background technique [0002] At present, the design method of geotechnical engineering is still dominated by deterministic design. The safety factor in a certain limit state is calculated through the resistance and effect in the geotechnical structure, and compared with the safety factor allowed by the code, as the engineering Safety evaluation index. This method does not consider the inherent uncertainty of geotechnical engineering, especially the uncertainty of material parameters of geotechnical mass, so it has great limitations. With the continuous popularization and application of reliability theory and design methods in civil engineering, geotechnical engineering design, such as foundation bearing capacity design, is gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/13G06F30/20G06Q10/06G06Q50/08
CPCG06F30/13G06F30/20G06Q10/0635G06Q50/08Y02T90/00
Inventor 李斌
Owner WUHAN UNIV OF TECH