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Roadbed underlying hidden hole critical stability calculation method for loess area

A critically stable and stable technology, applied in the field of geotechnical mechanics, can solve problems such as non-conformity, complex calculation of the overall model, affecting the efficiency of calculation, etc., to achieve the effect of high speed, easy promotion and good accuracy

Pending Publication Date: 2018-12-07
CHANGAN UNIV
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Problems solved by technology

According to the traditional calculation method, the critical stability of loess caverns with different center distances and cave diameters cannot be accurately and quantitatively calculated, and the calculation of the overall model is complicated, and it cannot be effectively programmed, which seriously affects the efficiency of calculation. Current engineering design calculation requirements

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  • Roadbed underlying hidden hole critical stability calculation method for loess area
  • Roadbed underlying hidden hole critical stability calculation method for loess area
  • Roadbed underlying hidden hole critical stability calculation method for loess area

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Embodiment

[0059]According to the principle of the critical stability method of the subgrade dark hole in the loess area of ​​the present invention, the stability of the dark hole with a diameter of 1 meter, a center distance of 3 meters and a depth of 3.5 meters under the subgrade of a certain loess area is calculated. The material parameters of the foundation loess are shown in Table 1:

[0060]

[0061] According to the Drucker-Prager yield criterion:

[0062]

[0063]

[0064]

[0065] Calculate the yield stress σ y = 79.25Kpa. Establish the equation of motion, then conduct undamped modal analysis, calculate the frequency of the natural vibration circle, and combine the results of the modal analysis to calculate the Rayleigh damping coefficient; use the Newmark implicit integral method to solve the equation of motion, and calculate the equivalent stress; change the load cycle Dynamic transient analysis, find out the most unfavorable load cycle, calculate the maximum equ...

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Abstract

The invention discloses a roadbed underlying hidden hole critical stability calculation method for a loess area. Firstly, a calculation model is established according to the physical properties of thehole diameter of the loess hidden holes, and the yield stress is calculated; a power equation is established, circular frequency of the vibration type is calculated and a modal analysis result is combined, and then the maximum equivalent stress under a dynamic load condition is calculated; numerical calculation is carried out by changing buried depth, and the relation between the maximum equivalent stress and the stable burial depth is obtained, the yield stress in the model is substituted, and the stable burial depth of the hidden hole in the model soil is obtained; and the center distance is changed in sequence, the stable burial depth is calculated, and the result is subjected to numerical fitting to obtain a roadbed underlying hidden hole stability discriminating curve of the loess area. The method combines the advantages of flexibility of numerical analysis and integrity and continuity of analytical solution, and hole diameter and center distance double-variable critical burial depth regression prediction is carried out on the stability of the loess hidden hole under the dynamic load, so that the method is high in speed, high in accuracy, easy to popularize and capable of well meeting the requirements of specific engineering.

Description

technical field [0001] The invention belongs to the technical field of rock and soil mechanics, and in particular relates to a method for calculating the critical stability of a subgrade dark hole in a loess area. Background technique [0002] In the construction of large-scale traffic projects in the loess area of ​​Northwest China, engineering geological disasters caused by hidden loess cavities under the roadbed cannot be ignored. Due to the particularity of the loess soil, the concealment of the location of the underlying dark cave, and the suddenness of the instability time, the disasters caused not only destroy the road structure, but also threaten the driving safety. Therefore, it is necessary to study the influence of loess dark cavities under the roadbed on the stability of the roadbed. According to the traditional calculation method, the critical stability of loess caverns with different center distances and cave diameters cannot be accurately and quantitatively c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/18G01N33/24
CPCG06F17/18G01N33/24
Inventor 邓亚虹吴伟李喜安
Owner CHANGAN UNIV
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