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A Lower Limit Method for Analysis of Ultimate Bearing Capacity of Rock Slope Considering Rotation Effect

A technology for rocky slopes and slopes, which is applied in the fields of climate change adaptation, special data processing applications, on-site foundation soil survey, etc., can solve the problem that the analysis method cannot consider the translational and rotational effects of rock mass at the same time, and there are few research results. It is difficult to consider issues such as

Active Publication Date: 2020-07-31
KUNMING UNIV OF SCI & TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Many analysis methods cannot consider the translational and rotational effects of rock mass at the same time. For example, the rigid body limit equilibrium method and finite element method can only consider the translational effect of rock mass, but engineering practice shows that the rotational effect of rock mass is very important. Important and indispensable, such as: rotation failure is the main failure mode for bedding jointed rock slopes
[0006] (2) The failure modes of structural planes in jointed rock slopes are also very diverse. It is generally believed that there are three types: slip shear failure, tensile failure and rotational failure, but it is difficult for existing analysis methods to consider these three at the same time. failure mode
[0007] (3) In the field of limit analysis, especially in the field of lower limit analysis, there are few research results on the study of rock mass while considering translation and rotation effects

Method used

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  • A Lower Limit Method for Analysis of Ultimate Bearing Capacity of Rock Slope Considering Rotation Effect
  • A Lower Limit Method for Analysis of Ultimate Bearing Capacity of Rock Slope Considering Rotation Effect
  • A Lower Limit Method for Analysis of Ultimate Bearing Capacity of Rock Slope Considering Rotation Effect

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Experimental program
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Embodiment 1

[0085] Embodiment 1: Embodiment 1 uses formula (11) to solve the ultimate external load of a jointed rock slope containing 2 rock blocks.

[0086] (1) Formulate calculation parameters for jointed rock slopes.

[0087] Figure 8 It is a schematic diagram of the geometry of the jointed rock slope in Example 1. The slope contains two rock blocks. Rock block 1 is rectangular in shape with a width of 1.0m and a height of 2.0m; rock block 2 is in the shape of a triangle with a height of 2.0m and a bottom width of 5.495m. There is a through joint between rock block 1 and rock block 2, and the inclination angle of the joint surface is 20°. The physical and mechanical parameters of slope materials are shown in Table 1. Centroid C at block 1 1 There is a horizontal leftward external force F acting on the place, and the purpose of this embodiment is to solve the limit value F of F c .

[0088] Table 1 Example 1 The physical and mechanical parameter table of the jointed rock slope m...

Embodiment 2

[0099] Embodiment 2: Embodiment 2 is to use formula (12) to solve the strength reserve coefficient of a jointed rock slope containing 6 rock blocks.

[0100] (1) Formulate calculation parameters for jointed rock slopes.

[0101] Figure 11 It is a schematic diagram of the geometry of the jointed rock slope in Example 2. The inclination angle of the bottom of this slope is 25°, and the slope contains 6 rock blocks. The geometric dimensions of each rock block are detailed in Figure 11 . The physical and mechanical parameters of the slope materials are shown in Table 3. Among the six rock blocks, rock block 1 is a fixed rock block and cannot move, and rock blocks 2 to 6 may undergo translation or rotation. The purpose of this embodiment is to solve the strength reserve coefficient of the rock slope.

[0102] Table 3 Example 2 The physical and mechanical parameter table of the jointed rock slope material

[0103] material name Severity / (kN·m -3 )

Cohesion / k...

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Abstract

The invention relates to a lower-bound limit analysis method of bearing capacity considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope stability analysis. According to the method, a rigid block unit is scattered as a geometry system of a rigid rock and a structural plane, the normal force, shearing force and bending moment of the structural plane are used as unknown quantities, a static permission stress field satisfying an equilibrium equation considering the translation and rotation effects of the rigid block unit, structural plane shear yield conditions, structural plane tensile yield conditions, structural plane rotational yield conditions and static boundary conditions is constructed, an overload coefficient is used as a target function, and a lower-bound linear mathematic programming model is built; the linear mathematic programming model is solved by means of an interior point algorithm, a strength reserve coefficient is solved by means of an iterative method at the same time, and the lower-bound solution and corresponding yield area of the overload coefficient or the strength reserve coefficient of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high, and the method can be applicable to bearing capacity analysis of translational or rotational failure of the jointed rock slope.

Description

technical field [0001] The invention is a lower limit method for analyzing the ultimate bearing capacity of a jointed rock slope considering both translation and rotation effects of the rock mass, in particular to a bearing capacity that simultaneously considers the shear failure, tensile failure and rotation failure of the structural plane of the rock mass Analysis. The invention belongs to the technical field of rock slope stability analysis. Background technique [0002] The instability of jointed rock slope is a common geological disaster. In domestic and foreign highways, railways, mines and water conservancy and hydropower projects, a large number of catastrophic accidents of joint rock slope instability and failure have been encountered, such as the domestic Tianshengqiao No. 2 Hydropower Station slope dumping and Jinchuan open-pit mine slope instability etc. The bearing capacity and stability evaluation method of jointed rock slopes has become an important technic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20E02D17/20E02D1/02
CPCE02D1/02E02D17/20G06F30/20Y02A10/23
Inventor 李泽彭普周宇张小艳
Owner KUNMING UNIV OF SCI & TECH
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