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Method for predicting stability of three-dimensional asymmetric slope in earthquake load effect

A technology of stability prediction and earthquake load, which is applied in the field of civil engineering, can solve problems such as only applicable analysis methods, and achieve scientific and reasonable prediction results, scientific and reasonable results, and improved calculation accuracy

Inactive Publication Date: 2018-08-10
HOHAI UNIV
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Problems solved by technology

The analysis method based on the assumption that the sliding direction is parallel to the symmetry plane is only applicable to the traditional symmetric slope

Method used

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  • Method for predicting stability of three-dimensional asymmetric slope in earthquake load effect
  • Method for predicting stability of three-dimensional asymmetric slope in earthquake load effect
  • Method for predicting stability of three-dimensional asymmetric slope in earthquake load effect

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Embodiment 1

[0077] The three-dimensional slope schematic diagram of this embodiment is as follows figure 2 As shown, slope toe β=26.5°, slope height H=12.2m, soil strength parameters are: cohesion c=29, internal friction angle φ=20, soil weight γ=18.8. The sliding surface is ellipsoidal.

[0078] Step 1, express the sliding surface and slope surface with equations

[0079] The sliding surface equation is:

[0080]

[0081] The slope surface equation is expressed as:

[0082]

[0083] Step 2, discretize the three-dimensional landslide body into soil columns, and discretize the whole landslide body into 100 rows*100 columns in the xoy plane;

[0084] Step 3: Establish the stability prediction equations of the three-dimensional asymmetric slope under the seismic load, and solve the equations to obtain the safety factor Fs and the sliding direction α of the three-dimensional asymmetric slope.

[0085] Table 1 Three-dimensional slope safety factor and sliding direction under earthqu...

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Abstract

The invention discloses a method for predicting the stability of a three-dimensional asymmetric slope in an earthquake load effect. The method comprises: step 1, selecting a to-be-predicted slope, determining the three-dimensional geometrical dimension of the slope and the geometrical shape of a three-dimensional glide plane, and expressing the geometrical shape of a surface of the slope and the shape of the glide plane via an equation; step 2, dispersing a sliding object into soil strip bars; step 3, establishing an equation set for predicting the stability of a three-dimensional asymmetric slope in an earthquake load effect, and solving the equation set to obtain a safety factor Fs and a glide direction alpha of the slope; and step 4, judging the stability of the three-dimensional asymmetric slope according to the critical value of a stability coefficient. Compared with a method in the prior art, the method takes the effect of earthquake force in a vertical direction (z) and horizontal directions (x and y) on the stability of the slope into consideration, and takes the effect of the glide direction on the prediction of the stability of the asymmetric slope into consideration. Themethod is high in calculation precision, fast in speed and reliable in prediction results.

Description

technical field [0001] The invention belongs to the field of civil engineering, and in particular relates to a method for predicting the stability of a three-dimensional asymmetric slope under the action of an earthquake load. Background technique [0002] my country's hills and hills are widely distributed, which objectively determines that my country has a large number of natural slopes; at the same time, my country is currently in a period of rapid economic development, and a large number of infrastructure constructions have produced a large number of artificial slopes such as road cutting slopes . Due to the influence of variable slope geometry, complex geological conditions, additional loads and earthquake action, many slopes show asymmetrical characteristics. [0003] In addition, since my country is located between two major seismic belts in the world—the circum-Pacific seismic belt and the Eurasian continental seismic belt, areas with seismic fortification intensity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 高玉峰万愉快张飞戴光宇张京伍赵子豪
Owner HOHAI UNIV
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