Hurst index-based slope safety evaluation method

Abstract

The invention discloses a hurst index-based slope safety evaluation method, which comprises the following steps of: (1) performing safety classification; (2) preprocessing data; (3) simply prejudging the data; (4) calculating hurst indexes and related parameters; (5) determining a slope safety level; and (6) analyzing other parameters. According to the hurst index-based slope safety evaluation method provided by the invention, the integral safety of a slope is analyzed and evaluated by calculating the hurst index H of each monitoring point in a slope monitoring system and then combining all hurst indexes H; and compared with the conventional other methods, the method has the advantages of capability of eliminating the sudden change of monitoring data caused by field construction and the like and excellently high applicability.

Description

technical field

[0001] The invention relates to a method for evaluating safety of a slope, in particular to a method for evaluating safety of a slope based on the Hurst index. Background technique

[0002] Landslide rock and soil is an open nonlinear system, and complexity is its essential property. Due to the diversity and complexity of the landslide's formation conditions, evolution process and deformation-inducing factors, and the uncertainty of its changes, its mechanical behavior and deformation trend also reflect the nonlinear characteristics of coexistence of determinism and randomness. The monitoring time series of surface displacement and deformation of landslides is often used as the basis for establishing theoretical models or criteria for landslide time prediction and prediction because it reflects the system characteristics of landslides intensively. At present, for the cutting-edge scientific issue of landslide prediction and forecasting, nonlinear scientific ...

Examples

Embodiment 1

[0037] Example 1 Using Matlab to Realize Slope Safety Evaluation Based on Hurst Index

[0038] (1) Safety classification: Combined with the engineering grade of the slope, the slope is divided into three safety grades according to the Hurst index, and the safety warning range of the corresponding safety grade is determined as shown in Table 2;

[0039] Table 2 Security Level Classification

[0040] grading

I

II

III

H

0.9~1.0

0.75~0.90

0.5~0.75

[0041] (2) Data preprocessing: first determine the monitoring point of the slope, and then perform incremental calculation on the monitoring data of the monitoring point, that is, y i =x i -x i-1 , where x i is the original sequence (for monitoring data caused by construction and other reasons x i The mutation can be deleted directly, but the subsequent monitoring data x i+1 position and value), y i is the new sequence; then use the exponential smoothing method to smooth the new seque...

Embodiment 2

[0046] Embodiment 2 adopts the method in real-time example 1 to carry out the safety evaluation of certain rocky high slope

[0047] A certain level of hydropower station is located in Sichuan Province. It is a controlled reservoir in the downstream river section, with annual regulation capacity, and has significant benefits for downstream cascade compensation and regulation.

[0048] The valley in the hydropower station hub area is a typical deep-cut "V"-shaped canyon, and the relative height difference between the valley slopes on both sides reaches 1500-1700m. Structurally, it is Santan inverted turn oblique, with rock formation N15~60°E / SE35~45°, and the direction is basically consistent with the direction of the river. The bedrock is mainly metamorphic rocks of the Zagunao Formation (T2-3Z) of the Middle and Upper Triassic, the first section (T2-3Z1) greenschist, the second section (T2-3Z2) marble, the third section (T2-3Z2) 3Z3) Sand slate. The left bank slope of the h...

technical field

[0001] The invention relates to a method for evaluating safety of a slope, in particular to a method for evaluating safety of a slope based on the Hurst index. Background technique

[0002] Landslide rock and soil is an open nonlinear system, and complexity is its essential property. Due to the diversity and complexity of the landslide's formation conditions, evolution process and deformation-inducing factors, and the uncertainty of its changes, its mechanical behavior and deformation trend also reflect the nonlinear characteristics of coexistence of determinism and randomness. The monitoring time series of surface displacement and deformation of landslides is often used as the basis for establishing theoretical models or criteria for landslide time prediction and prediction because it reflects the system characteristics of landslides intensively. At present, for the cutting-edge scientific issue of landslide prediction and forecasting, nonlinear scientific ...

Examples

Embodiment 1

[0037] Example 1 Using Matlab to Realize Slope Safety Evaluation Based on Hurst Index

[0038] (1) Safety classification: Combined with the engineering grade of the slope, the slope is divided into three safety grades according to the Hurst index, and the safety warning range of the corresponding safety grade is determined as shown in Table 2;

[0039] Table 2 Security Level Classification

[0040] grading

I

II

III

H

0.9~1.0

0.75~0.90

0.5~0.75

[0041] (2) Data preprocessing: first determine the monitoring point of the slope, and then perform incremental calculation on the monitoring data of the monitoring point, that is, y i =x i -x i-1 , where x i is the original sequence (for monitoring data caused by construction and other reasons x i The mutation can be deleted directly, but the subsequent monitoring data x i+1 position and value), y i is the new sequence; then use the exponential smoothing method to smooth the new seque...

Embodiment 2

[0046] Embodiment 2 adopts the method in real-time example 1 to carry out the safety evaluation of certain rocky high slope

[0047] A certain level of hydropower station is located in Sichuan Province. It is a controlled reservoir in the downstream river section, with annual regulation capacity, and has significant benefits for downstream cascade compensation and regulation.

[0048] The valley in the hydropower station hub area is a typical deep-cut "V"-shaped canyon, and the relative height difference between the valley slopes on both sides reaches 1500-1700m. Structurally, it is Santan inverted turn oblique, with rock formation N15~60°E / SE35~45°, and the direction is basically consistent with the direction of the river. The bedrock is mainly metamorphic rocks of the Zagunao Formation (T2-3Z) of the Middle and Upper Triassic, the first section (T2-3Z1) greenschist, the second section (T2-3Z2) marble, the third section (T2-3Z2) 3Z3) Sand slate. The left bank slope of the h...

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