CN117607398A - Prediction method for critical water content of instability of gravel soil slope - Google Patents

Prediction method for critical water content of instability of gravel soil slope Download PDF

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CN117607398A
CN117607398A CN202410089586.7A CN202410089586A CN117607398A CN 117607398 A CN117607398 A CN 117607398A CN 202410089586 A CN202410089586 A CN 202410089586A CN 117607398 A CN117607398 A CN 117607398A
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instability
gravel soil
water content
slope
critical water
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CN117607398B (en
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杨志全
任晓龙
朱颖彦
韩用顺
廖丽萍
杨溢
张�杰
喜文飞
白仙富
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Kunming University of Science and Technology
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    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract

The invention relates to a method for predicting critical water content of instability of a gravel soil slope, and belongs to the technical field of disaster prevention and reduction of geological disasters. Aiming at the problem that the prior gravel soil slope instability prediction cannot objectively, truly and simply directly predict the slope instability, the invention provides a method for predicting the slope instability through the critical water content of the gravel soil slope instability and predicting the slope instability through the critical water content w of the gravel soil slope instability c Calculating the critical water content w of the gravel soil side slope instability according to a calculation formula c . The method and the device have the remarkable characteristics of simple and quick operation and reliable prediction precision by quantitatively calculating the critical water content of the instability of the gravel soil side slope and predicting the instability of the side slope through the critical water content of the instability of the gravel soil side slope.

Description

Prediction method for critical water content of instability of gravel soil slope
Technical Field
The invention relates to a method for predicting critical water content of instability of a gravel soil slope, and belongs to the technical field of disaster prevention and reduction of geological disasters.
Background
In the prior art, two main methods are used for predicting the instability of the gravel soil slope: 1) The slope instability prediction is realized by analyzing the change rule of deformation parameters (such as displacement, speed, acceleration and the like) in the slope instability damage process and establishing a corresponding prediction model; 2) And analyzing and establishing a slope deformation instability range prediction model by taking the slope excavation height, the rock stratum inclination angle, the excavation slope ratio, the weak interlayer spacing and the internal friction angle as indexes. The 2 slope instability prediction methods all have the influence effect that the property parameters of the rock and soil in the slope can not be objectively and truly reflected in the instability process, however, the property parameters of the rock and soil in the slope are direct influence factors of the instability of the slope, and have decisive influence on the instability of the slope. Therefore, the prediction result obtained by the current gravel soil slope instability prediction method is low in certainty and reliability.
Disclosure of Invention
Aiming at the problem that the certainty and reliability of the current gravel soil slope instability prediction result are not high, the invention provides a method for predicting the critical water content of the gravel soil slope instability, namely, the method predicts the slope instability through the critical water content of the gravel soil slope instability, and the applicant discovers that the density, the initial mass water content and the grain size distribution have obvious influence on the critical water content of the gravel soil slope instability according to the density rho of the gravel soil, the initial mass water content theta and the grain mass content p of the gravel soil grain size distribution, which is less than 2mm, of the grain mass content p of the gravel soil 2 Through critical water content w of instability of gravel soil slope c Calculating the critical water content w of the gravel soil side slope instability according to a calculation formula c To predict slope instability; has the remarkable characteristics of simple and quick operation and reliable prediction precision。
A method for predicting the critical water content of the instability of a gravel soil slope comprises the following specific steps:
(1) Determining the gravel soil density rho;
(2) Measuring the initial mass water content theta of the gravel soil;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 ；
(4) According to the density rho of the gravel soil, the initial mass water content theta and the mass content p of particles below 2mm in the particle grading of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c And the gravel soil slope instability prediction is realized.
The step (4) is that the gravel soil slope is unstable and critical to contain water w c The calculation formula of (2) is
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%.
Critical water content w for gravel soil slope instability c The obtaining process of the calculation formula of (2):
according to the theory of soil mechanics:
n=1-ρ/[(1+θ) ρ w ds]
wherein: n is the porosity of the rock-soil body,%; ρ is the density of the rock-soil mass, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass water content of the rock-soil mass,%; ρ w Density of water, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the ds is the specific gravity of the rock-soil mass, and is dimensionless;
due to ρ w =1g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the So that the number of the components in the product,
n=1-ρ/[(1+θ)ds]
since the mass content of the particles below 2mm in the gravel soil specific gravity and the particle size distribution meets the following change rule:
ds=c/p 2
wherein: c is a constant; so that the number of the components in the product,
n=1-[ρ/(1+θ)] *(p 2 /c)
because water is distributed in the pores of the rock-soil body, the critical water content for the instability of the gravel soil slope has a positive relation with the porosity, namely, the larger the porosity of the gravel soil is, the higher the critical water content for the instability of the slope is; the smaller the porosity of the gravel soil is, the lower the critical water content of slope instability is; the critical destabilization water content of the gravel soil side slope, the density of the gravel soil, the water content of the initial mass and the mass content of the particles below 2mm in the particle grading meet the following change rules:
w c = a+b*ρ/(1+θ) +(c*p 2 )
wherein: a. b, c are constants, fitted from experimental data, where a=95.2, b= -49.9, c=21.5.
The beneficial effects of the invention are as follows:
(1) The invention provides a method for predicting the slope instability through the critical water content of the gravel soil slope instability and researches the critical water content w of the gravel soil slope instability, which solves the problems of low certainty and reliability of the current gravel soil slope instability prediction result c Is a quantitative calculation formula of (2);
(2) Through a great deal of researches, the invention discovers the critical water content w of the instability of the gravel soil side slope c Density rho of the gravel soil, initial mass water content theta and particle mass content p of less than 2mm in the particle grading of the gravel soil 2 Forming a quantitative relation, and predicting the critical water content w of the instability of the gravel soil slope through the quantitative relation c Therefore, accurate prediction of the instability of the gravel soil slope is realized.
Detailed Description
The invention will be described in further detail with reference to specific embodiments, but the scope of the invention is not limited to the description.
The critical water content w of the gravel soil side slope instability c The obtaining process of the calculation formula of (2):
according to the theory of soil mechanics:
n=1-ρ/[(1+θ) ρ w ds]
wherein: n is the porosity of the rock-soil body,%; ρ is the density of the rock-soil mass, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass water content of the rock-soil mass,%; ρ w Density of water, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the ds is rock soilBulk specific gravity, dimensionless;
due to ρ w =1g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the So that the number of the components in the product,
n=1-ρ/[(1+θ)ds]
since the mass content of the particles below 2mm in the gravel soil specific gravity and the particle size distribution meets the following change rule:
ds=c/p 2
wherein: c is a constant; so that the number of the components in the product,
n=1-[ρ/(1+θ)] *(p 2 /c)
because water is distributed in the pores of the rock-soil body, the critical water content for the instability of the gravel soil slope has a positive relation with the porosity, namely, the larger the porosity of the gravel soil is, the higher the critical water content for the instability of the slope is; the smaller the porosity of the gravel soil is, the lower the critical water content of slope instability is; the critical destabilization water content of the gravel soil side slope, the density of the gravel soil, the water content of the initial mass and the mass content of the particles below 2mm in the particle grading meet the following change rules:
w c = a+b*ρ/(1+θ) +(c*p 2 )
wherein: a. b, c are constants, fitted from experimental data, where a=95.2, b= -49.9, c=21.5;
thus, the first and second substrates are bonded together,
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%.
Example 1: the method for predicting the critical water content of the instability of the gravel soil slope in a certain area comprises the following specific steps:
(1) Determination of the gravel Density ρ of 1.63g/cm by Density test 3 ；
(2) Determining the initial mass water content theta of the gravel soil to be 6.42% by utilizing a water content test;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 30.74%;
(4) According to density ρ of gravel soilThe water content of the initial mass theta and the mass content p of the particles below 2mm in the graining of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c Realizing the prediction of the instability of the gravel soil slope;
critical water content w for gravel soil slope instability c The calculation formula of (2) is
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%;
the critical water content w of the instability of the gravel soil slope of the embodiment c The calculated result is 25.43%, the detection value of the water content of the gravel soil slope instability of the embodiment is 29.43%, the error rate is 13.77%, and the error rate is lower than 15%, so the critical water content w of the gravel soil slope instability is calculated c The method can quantitatively and accurately realize the prediction of the instability of the gravel soil slope.
Example 2: the method for predicting the critical water content of the instability of the gravel soil slope in a certain area comprises the following specific steps:
(1) Determination of the gravel Density ρ of 1.80g/cm by Density test 3 ；
(2) Determining the initial mass water content theta of the gravel soil to be 5.91% by utilizing a water content test;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 10.00%;
(4) According to the density rho of the gravel soil, the initial mass water content theta and the mass content p of particles below 2mm in the particle grading of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c Realizing the prediction of the instability of the gravel soil slope;
critical water content w for gravel soil slope instability c The calculation formula of (2) is
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%;
the critical water content w of the instability of the gravel soil slope of the embodiment c The calculated result is 12.54%, the detection value of the water content of the gravel soil slope instability of the embodiment is 14.07%, the error rate is 10.86%, and the error rate is lower than 15%, so the critical water content w of the gravel soil slope instability is calculated c The method can quantitatively and accurately realize the prediction of the instability of the gravel soil slope.
Example 3: the method for predicting the critical water content of the instability of the gravel soil slope in a certain area comprises the following specific steps:
(1) Determination of the gravel Density ρ of 1.84g/cm by Density test 3 ；
(2) Determining the initial mass water content theta of the gravel soil to be 6.16% by utilizing a water content test;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 20.00%;
(4) According to the density rho of the gravel soil, the initial mass water content theta and the mass content p of particles below 2mm in the particle grading of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c Realizing the prediction of the instability of the gravel soil slope;
critical water content w for gravel soil slope instability c The calculation formula of (2) is
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%;
the critical water content w of the instability of the gravel soil slope of the embodiment c The calculated result is 13.01%, the detection value of the water content of the gravel soil slope instability of the embodiment is 14.84%, the error rate is 12.32%, and the error rate is lower than 15%, so the critical water content w of the gravel soil slope instability is calculated c The method can quantitatively and accurately realize the prediction of the instability of the gravel soil slope.
Example 4: the method for predicting the critical water content of the instability of the gravel soil slope in a certain area comprises the following specific steps:
(1) Determination of the gravel Density ρ of 1.78g/cm by Density test 3 ；
(2) Determining the initial mass water content theta of the gravel soil to be 5.38% by utilizing a water content test;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 37.13%;
(4) According to the density rho of the gravel soil, the initial mass water content theta and the mass content p of particles below 2mm in the particle grading of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c Realizing the prediction of the instability of the gravel soil slope;
critical water content w for gravel soil slope instability c The calculation formula of (2) is
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%;
the critical water content w of the instability of the gravel soil slope of the embodiment c The calculated result is 18.90%, the detection value of the water content of the gravel soil slope instability of the embodiment is 21.28%, the error rate is 11.20%, and the error rate is lower than 15%, so the critical water content w of the gravel soil slope instability is calculated c The method can quantitatively and accurately realize the prediction of the instability of the gravel soil slope.
While the specific embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes may be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (2)

1. A method for predicting the critical water content of the instability of a gravel soil slope is characterized by comprising the following specific steps:
(1) Determining the gravel soil density rho;
(2) Measuring the initial mass water content theta of the gravel soil;
(3) The mass content p of the particles below 2mm in the graining soil grain composition is determined by grain analysis 2 ；
(4) According to the density rho of the gravel soil, the initial mass water content theta and the mass content p of particles below 2mm in the particle grading of the gravel soil 2 Calculating the critical water content w of the instability of the gravel soil slope c And the gravel soil slope instability prediction is realized.
2. The method for predicting the critical water content of instability of a gravel soil slope according to claim 1, wherein the method comprises the steps of: step (4) critical water content w of gravel soil slope instability c The calculation formula of (2) is
w c = a+b*ρ/(1+θ) +(c*p 2 )
Wherein: a. b, c are constants, fitted from experimental data, where a=95.2, b= -49.9, c=21.5;
therefore, the critical water content w of the instability of the gravel soil slope c The calculation formula of (2) is converted into
w c = 95.2-49.9[ρ/(1+θ)] +21.5p 2
Wherein w is c The water content is the critical water content of the instability of the gravel soil slope,%; ρ is the density of the gravel soil, g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is the initial mass moisture content of the gravel soil,%; p is p 2 The mass content of the particles below 2mm in the gravel soil particle size distribution is%.
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