Plastic ultimate analysis lower limit method for ultimate bearing capacities of rock slopes with rock bridges

A technology for plastic limit analysis and ultimate bearing capacity, applied in the field of rock slope stability analysis, which can solve problems such as application limitations, inability to directly obtain stability safety factors, and assumption gaps.

Active Publication Date: 2016-11-16
KUNMING UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

[0005] (1) Among the mainstream methods for rock slope stability analysis at this stage: although the limit equilibrium method has been greatly improved and enhanced by the efforts of many scholars, it is still only applicable to the upper rock of a single fracture surface or joint cutting surface. The stability analysis of the block, that is, the limit equilibrium method has a certain gap between the assumption of the rock mass a...

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  • Plastic ultimate analysis lower limit method for ultimate bearing capacities of rock slopes with rock bridges
  • Plastic ultimate analysis lower limit method for ultimate bearing capacities of rock slopes with rock bridges
  • Plastic ultimate analysis lower limit method for ultimate bearing capacities of rock slopes with rock bridges

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Embodiment 1

[0109] Example 1: The method of the present invention is used to solve the ultimate load of a simple slope, and the analysis is compared with the analytical solution.

[0110] (1) Formulate calculation parameters of slope

[0111] Such as Figure 8 The rock slope with a rock bridge is shown, and the rock slope is composed of four rock blocks and a rock bridge. Each rock block has a width of 12.0m and a height of 7.5m. The length of the rock block interface AB, CD, JF, and GK is 12.0m; the EBFGCH area is a rock bridge with a width of 1.0m and a height of 17.0m. The interface between the rock block and the rock bridge is EBF and HCG, and it is assumed that the interface EBF and HCG are smooth. The self-weight of the four rock blocks is G, and there is a concentrated force P acting at the midpoint of the AI ​​edge in rock block 1. In the calculation, it is assumed that the rock block is a rigid-plastic body without failure; the rock slope failure is the shear failure of the rock bri...

Embodiment 2

[0126] Embodiment 2: The method of the present invention is used to calculate the strength reserve coefficient of a rock slope with a rock bridge, and the result is compared with the Janbu method.

[0127] (1) Formulate calculation parameters of slope

[0128] Such as Picture 11 The rock-bridged rock slope with two sets of parallel weak structural surfaces is shown, which is composed of multiple rock blocks and a rock bridge. The rock slope has a length of 177.96m and a height of 120m. The slope is cut into multiple blocks by two sets of intersecting joint planes. The two sets of joints are at 105° and 150° from the horizontal plane. The distance between the two sets of joints is 20.0m. The ABCD area is a rock bridge, which is not damaged by joint cutting, and its width is 3.0m. Specific geometric dimensions such as Picture 11 Shown. The physical and mechanical parameters of the rock slope material of Example 2 are shown in Table 4.

[0129] Table 4 Example 2 Physical parameter ...

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Abstract

The invention relates to a calculation method for ultimate bearing capacities of rock slopes with rock bridges, and belongs to the field of rock slope stability analysis. The method comprises the following steps of: dispersing a rock slope with rock bridges by adoption of a composite element method on the basis of a theory of the plastic ultimate analysis lower limit method; establishing a nonlinear mathematic programming model for stability analysis of rock slopes with rock bridges by taking an ultimate load and a strength reserve coefficient of the rock slope as target functions; and solving maximum values of the ultimate load and the strength reserve coefficient by using a mathematic programming optimization algorithm. According to the method provided by the invention, the plastic ultimate analysis lower limit method, a composite element method dispersion technology and a mathematic programming measure are combined to establish a rock slope ultimate bearing capacity solution method which not only can simulate the continuous media characteristics of the rock bridges, but also can simulate the non-continuous media characteristics of rock blocks. The method provided by the invention has the characteristics of being clear in concept and high in calculation precision, and can be applied to the analysis of bearing capacities of the rock bridges in rock slopes.

Description

Technical field [0001] The invention relates to a method for calculating the ultimate bearing capacity of a rock slope with a rock bridge, in particular to a plastic limit analysis lower limit method based on a composite element method, and belongs to the technical field of rock slope stability analysis. Background technique [0002] A large number of rock slope engineering problems are bound to be encountered in important projects such as mining, transportation, water conservancy and hydropower, and national defense construction. Rock slopes often experience geological disasters such as instability and destruction. For example, in the Wenchuan earthquake, according to statistics from the Ministry of Land and Resources, there were more than 1,800 unstable slope collapses in the entire earthquake-damaged area. These disasters seriously affected the people’s lives and property safety and the sustained and stable development of the national economy. . Therefore, it is urgent to car...

Claims

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Application Information

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IPC IPC(8): G06F17/50E02D17/20
CPCE02D17/20G06F30/23G06F2111/04Y02A10/23
Inventor 李泽薛龙周宇魏久坤
Owner KUNMING UNIV OF SCI & TECH
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