Stability evaluation method of spherical crown slope under group tension based on simplified bishop method
An evaluation method and stability technology, which is applied in the fields of electrical digital data processing, instruments, geometric CAD, etc., can solve the problems of insufficient stability of the three-dimensional spherical cap slope, and achieve the effect of simple calculation process and reasonable calculation results.
Active Publication Date: 2021-01-15
ZHENGYE ENG & INVESTMENT INC +1
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[0004] In view of the above problems, the problem to be solved in the present invention is to provide a method for evaluating the stability of spherical crown slopes with group tension based on the simplified Bishop method, so as to solve the problem of the existing two-dimensional limit equilibrium method in evaluating the three-dimensional spherical crown slope with group tension. Weaknesses in slope stability
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[0044] Example: Step 1: The spherical crown slope under the action of group tension is divided into 8 ring-shaped blocks, and the calculation parameters are: γ i Both are 25kN / m 3 ; c 1i Both are 100kPa, Both are 45°; c 2i Both are 100kPa, Both are 45°; R is 152.5m; r i As shown in Table 1; F xi and F yi As shown in table 2.
[0045] Table 1 Annular block radius r i
[0046] bar number 1 2 3 4 5 6 7 8 r i (m)
125.9 113.6 102.6 92.6 83.6 74.6 64.6 55.6
[0047] Table 2 Ring bar F xi and F yi
[0048] bar number 1 2 3 4 5 6 7 8 f xi (kN)
2000 1800 1600 1400 1200 800 600 400 f yi (kN)
2000 1800 1600 1400 1200 800 600 400
[0049] Step 2: Select multiple fan-shaped bodies with an included angle of Δψ, h i , l i , θ i , R i, R i0 as shown in Table 3.
[0050] Table 3 Sector h i , l i , θ i , R i , R i0
[0051] sector number 1 2 3 4 5 6 7 8 h ...
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The invention discloses a method for evaluating stability of a spherical crown type slope under action of group tension based on a simplified Bishop method. The implementation process of the method for evaluating the stability is as follows: dividing a spherical crown type slope into a plurality of annular strip blocks, and obtaining the radius ri of each annular strip block; selecting a pluralityof fan-shaped bodies with an included angle of delta psi, and obtaining the height hi, the bottom surface length li and the inclination angle theta i between the bottom surface and the horizontal plane of each fan-shaped body i; and iteratively calculating the slope safety factor Fs through the following formula. A new assumption introduced into the simplified Bishop method is improved by considering the arch effect of the spherical crown type side slope; meanwhile, the group tension is added into the formula, the improved simplified Bishop method can be used for evaluating the stability of the spherical crown type slope under the group tension effect, the calculation process is simple, and a method with a more reasonable calculation result is provided for evaluating the stability of thespherical crown type slope under the group tension effect.
Description
technical field [0001] The invention relates to a slope stability evaluation method, in particular to a spherical crown type slope stability evaluation method based on a simplified Bishop method. Background technique [0002] In mountain engineering construction and landslide disaster prediction and analysis, slopes of various shapes will be encountered. For example, the shape of the slope in the horizontal plane can be divided into convex, concave and linear. The spatial shape of the slope It will undoubtedly affect its stability. Strictly speaking, slope stability analysis is a spatial problem, and the three-dimensional analysis method is more in line with the actual situation. In engineering, the evaluation of slope stability generally adopts the two-dimensional limit equilibrium method. This method is suitable for linear slope calculations. The accuracy is acceptable, but the calculation results of spherical crown slopes with significant spatial effects will be too cons...
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IPC IPC(8): G06F30/13G06F119/14
Inventor 沈志平宋二祥徐明付君宜吴斌靳颜宁
Owner ZHENGYE ENG & INVESTMENT INC