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Loess high slope stability analysis method suitable for rainfall condition

A stable analysis and loess technology, applied in excavation, construction, infrastructure engineering, etc., to prevent major geological disasters, use simple formulas, and improve calculation convergence.

Inactive Publication Date: 2016-07-27
SUN YAT SEN UNIV
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Problems solved by technology

[0011] In order to overcome the fact that the existing slope stability analysis methods cannot meet the requirements for stability analysis of loess high slopes under rainfall conditions, the present invention provides a method suitable for stability analysis of loess high slopes under rainfall conditions. The special failure form under the rainfall condition is based on the Swedish slice method, and through corresponding corrections, it meets the requirements of the stability analysis of the loess high slope

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  • Loess high slope stability analysis method suitable for rainfall condition
  • Loess high slope stability analysis method suitable for rainfall condition
  • Loess high slope stability analysis method suitable for rainfall condition

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[0035] The following is a simple example for calculation and analysis to illustrate the use of the slope stability evaluation method.

[0036] There is a high loess slope like image 3 As shown, the slope height is 70m, the slope angle is 40°, and the trailing edge tensile fissure is located at the top 10m of the slope. Loess natural weight 18kN / m 3 , Saturation severity 20kN / m 3 . The stability analysis steps are as follows:

[0037] (1) The friction angle of saturated remolded loess measured by triaxial consolidation drainage test is 24°, and the relationship between water content and cohesion is obtained by triaxial consolidation drainage test on undisturbed soil with different water content It is c=-4w+120.

[0038] (2) According to formula (2), find the depth z of the trailing edge crack 0 = 15.4m.

[0039] (3) Connect the end of the crack and the slope at 1 / 3h=23.3m from the toe of the slope. If the vertical bisector of the straight line is made, the center of the circle is on...

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Abstract

The invention discloses a loess high slope stability analysis method suitable for the rainfall condition. According to the loess high slope stability analysis method, based on the Sweden slice method, the situation that a sliding surface passes a back edge fracture end point and the position of 1 / 3 h of a slope surface is assumed, and meanwhile, the influence of rainfall weight increment and loess water content change on the loess slope stability is considered. The loess high slope stability analysis method comprises the basic steps that 1, the loess c (w) and phi values are measured; 2, the depth of a back edge fracture is calculated; 3, the circle center range of an arc failure surface is determined; 4, circle centers and loess bodies separated in a striped mode are selected; 5, the rainfall weight increment coefficient Ki is calculated; 6, the safety coefficient is calculated; 7, the different circle centers are selected by returning to the step 4 till the minimum safety coefficient is calculated; and 8, the water content value is changed, the step 4 is returned, and the minimum safety coefficients under different water contents are calculated. The loess high slope stability analysis method suitable for the rainfall condition is simple and practical, the related calculating parameters are clear in significance and easy to acquire, the problem of the stability estimation of a loess high slope can be effectively solved, and accordingly corresponding geological disaster hidden dangers are eliminated.

Description

Technical field [0001] The invention relates to a method suitable for stability analysis of high loess slopes under rainfall conditions, in particular to a calculation method suitable for evaluating the instability and failure of high loess slopes under rainfall conditions, belonging to the field of geological disaster prevention and control. Background technique [0002] my country is a country with frequent occurrences of geological disasters. The latest statistical yearbook shows that a total of 15,374 geological disasters occurred in my country in 2013, causing direct economic losses of 10.4 billion yuan. Among them, there were 13,120 landslides and collapse disasters caused by slope instability, accounting for 85% of the total geological disasters. In the Loess Plateau of Northwest my country, loess slopes are widely developed. In some areas, the thickness of loess is large, up to 400 meters, and unsaturated loess has high strength, so high slopes of more than 100 meters ca...

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Application Information

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IPC IPC(8): E02D17/20
CPCE02D17/20
Inventor 林署炯陈剑尚冉孟胶张澄博
Owner SUN YAT SEN UNIV
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