Three-dimensional slope stability prediction method under earthquake load effect
A technology of stability prediction and seismic load, applied in seismology, geophysical measurement, measurement device, etc., can solve the problems of inability to reflect the dynamic effect of earthquake on three-dimensional slope, ignore the dynamic force effect of seismic load, etc., and achieve reliable prediction results. , the effect of reducing the amount of calculation and improving the calculation accuracy
Active Publication Date: 2015-07-01
CHONGQING UNIV
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Problems solved by technology
Although in the past one hundred years, people have made considerable progress in the research of numerical methods for slope stability, the intelligent prediction method of 3D slope stability under seismic loads is still insufficient.
[0003] Under the action of seismic load, the three-dimensional slope should be a process of kinetic force, but in the previous stability analysis methods of slope engineering, the seismic load was only considered as a static force, which undoubtedly ignored the seismic load The kinematic force effect of , and the chronological change of the three-dimensional slope stability system
For example, "Calculation Method for Three-Dimensional Stability of Symmetrical Slopes", Zhu Dayong, Ding Xiuli, Liu Huali, Qian Qihu, Journal of Rock Mechanics and Engineering, Volume 26, Issue 1, Pages 22-27, recorded in January 2007 The limit equilibrium slice method is used to analyze the stability of the three-dimensional slope. The seismic load is only regarded as a static force, which cannot reflect the dynamic effect of the earthquake on the three-dimensional slope.
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[0112] The three-dimensional landslide body of this embodiment is such as figure 2 As shown, the slope surface is an inclined surface, and the inclination angle is 45°; the slip surface is an ellipsoid slip surface, and the semi-major axis of the width of the slip surface in the y direction is 20m; the half axis in the x and z directions The shaft length is 20m. The landslide body is an isotropic homogeneous material, and the soil index parameters are: the cohesion force of the landslide body c=30KPa, and the internal friction angle of the landslide body The bulk density of the landslide γ=22KN / m 3 . Poisson's ratio μ = 0.3, the amplification factor of seismic waves in geotechnical materials is f = 1.2, the period of seismic waves is T = 0.2s, the propagation velocity of transverse and longitudinal seismic waves in geotechnical materials are v respectively s =100m / s, and v p =106.9045m / s; the seismic acceleration coefficients in the horizontal and vertical directions are kh=0....
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The invention relates to three-dimensional slope stability prediction method under an earthquake load effect. The method comprises the following steps. Firstly, a specific to-be-predicted slope body is chosen, the three-dimensional sliding surface shape and the geometric dimension are confirmed, three-dimensional surfaces are divided into a slip surface and a side slope surface, and the slip surface and the side slope surface are shown with equations. Secondly, discretization is performed on the three-dimensional slope body. Thirdly, a predicated equation set of three-dimensional slope stability with consideration of the earthquake load effect is set, and last data of a three-dimensional slope stability coefficient is obtained through the equation set. Fourthly, whether the stability coefficient is larger than a set slope stability critical value or not is judged based on the last condition of the stability coefficient and by searching the most disadvantageous condition of the slope under the earthquake load effect. The three-dimensional slope stability prediction method under the earthquake load effect has the advantages that a dynamic effect of earthquake load in a slope engineering is considered, calculation precision is improved, and a predicted result is reliable.
Description
Technical field [0001] The invention belongs to the technical field of geological disaster prevention and control, and specifically relates to a method for predicting the stability of a three-dimensional slope under an earthquake load. Background technique [0002] my country is a country with extremely complex topography and geomorphology, and it is also a mountainous country, especially in the southwestern region of my country and Fujian, Guangxi, Guangdong and Hainan on the southeast coast. In the past few hundred years, there have been many very large landslides. Especially with the development of the national economy, the construction of a large number of railways, highways, water conservancy, mines and towns and other facilities, especially in the construction of hills and mountainous areas, the number of excavated and filled slopes during human engineering activities will increase. More, the height will get bigger and bigger. Geological disasters such as slope landslides...
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IPC IPC(8): G01V1/00
Inventor 周小平程浩
Owner CHONGQING UNIV