CN110412241B - Early warning method for rocky landslide of soft interlayer sliding surface and application of early warning method - Google Patents
Early warning method for rocky landslide of soft interlayer sliding surface and application of early warning method Download PDFInfo
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Abstract
The invention discloses an early warning method for rocky landslide of a soft interlayer sliding surface, belonging to the field of rocky landslide prevention and control and comprising the following steps of: a. soaking the slippery soil sample in water indoors, and measuring the friction angle of the slippery soil after soaking in water for 24 hours
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I; c. calculating an early warning comprehensive discrimination factor P of the landslide; d. and dividing the early warning grade of the rock landslide on the sliding surface of the weak interlayer by using an early warning comprehensive discrimination factor P. The invention researches the sliding surface characteristics, the topographic conditions and the rainfall conditions formed by the rock landslide of the sliding surface of the soft interlayer, establishes an accurate early warning calculation model of the rock landslide of the sliding surface of the soft interlayer, and has good early warning effect on the rock landslide of the sliding surface of the soft interlayer.
Description
Technical Field
The invention relates to the technical field of rock landslide prevention and control, in particular to a rock landslide early warning method for a soft interlayer sliding surface and application thereof.
Background
According to the material composition, cause, property and failure mode of the rock sliding surface, the rock sliding surface is divided into a weak interlayer sliding surface, a rock stratum sliding surface and a joint surface sliding surface. The sliding surface of the weak interlayer is flat and smooth, the clay mineral content is high, and the combination degree is poor. The reason for forming the sliding surface is analyzed, and the weak interlayer sliding surface is formed under the combined action of diagenesis, structure, surface growth and the like.
The sliding surface landslide of the soft interlayer belongs to the landslide which is easy to occur, a plurality of landslide disasters frequently occur in rainy seasons, and the rocky landslide is a natural disaster which cannot be ignored. Rock landslide is a natural phenomenon occurring in mountainous areas or highway slopes, and after the rock landslide occurs, sliding rock mass and soil on the upper surface of the rock mass move to the lower part of the hillside or the roadside to cause damage. The occurrence of rock landslide often requires three conditions: one is the terrain condition which is favorable for the occurrence of rock landslide; secondly, the rock stratum has a weak structural surface, such as a argillization interlayer in a sand-shale interbed; thirdly, abundant rainfall enters a weak structural surface from a crack and finally induces the occurrence of a landslide. These conditions affect and determine the stability of the slope in combination. Wherein, the influence factor of the terrain condition on the rock landslide comprises: slope gradient of a potential landslide body and a steep slope terrain on the upper side of the landslide body.
At present, The research of domestic and foreign scholars on The landslide formation conditions mainly focuses on The research of slope slopes, is simple data statistics of The development distribution rules, and does not deeply research The intrinsic mechanisms (engineering geology report, 2013, 21: 607-; hydroelectric power science, 2014, 32: 119-; mountain science report, 2015, 33: 108-. In addition to the influence of slope gradient on shallow landslide, the influence of factors such as upstream, left and right sides and downstream of a shallow landslide sensitive area on shallow landslide is slightly studied, but most of the studies are concentrated on qualitative research and the influence of a single factor is described, and a quantitative calculation method such as an upstream calculation model is rarely considered (Water resources research, 1994, 4: 1153-. For landslide prediction research, a statistical method, a regression analysis early warning model and a critical value thereof are mainly used, but the method can only use the prediction model in the region and cannot be used in other regions, and no method is used for early warning in a region without data.
Chinese patent documents with publication number CN 107476275A and publication date of 2017, 12 and 15 disclose an early warning method for rocky landslide in red zone, which is characterized by comprising the following steps: a. determining basic topographic data of a landslide mass including a landslide mass slope α, a landslide mass area A, a landslide mass upper side area A u and on the landslide mass by field survey mappingSide slope β; b. monitoring rainfall to obtain rainfall duration D and rainfall average intensity I; c. calculating an early warning discrimination factor P of the landslide according to the formula 1 by using the terrain factor and the rainfall factor; TR0.67(ii) a d. Dividing the early warning grade of the rock landslide by using the early warning discrimination factor P of the landslide, and sending a red early warning signal when the probability is high and is a red early warning grade when the P is more than or equal to 1.85; when P is more than or equal to 1.45 and less than 1.85, the possibility is medium, the orange early warning level is reached, and an orange early warning signal is sent out; when P is less than 1.45, the possibility is low, the level is a green early warning level, and a green safety signal is sent out. The early warning method for rock landslide in the red zone disclosed in the patent document describes an early warning model and a critical value for rock landslide in the red zone, but the model can be only used for a weak interlayer sliding surface in the red zone, but is not suitable for other zones, and cannot early warn landslide of other sliding surfaces.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides an early warning method for the rocky landslide of the sliding surface of the weak interlayer and application thereof.
The invention is realized by the following technical scheme:
a rock landslide early warning method for a soft interlayer sliding surface is characterized by comprising the following steps:
a. finding the position of the sliding surface of the landslide through field investigation, taking a slip-band soil sample after determining the slip-band soil sample as the sliding surface of the soft interlayer, soaking the slip-band soil sample indoors with water, and measuring the friction angle of the slip-band soil after 24 hours of soaking with water according to geotechnical experiment specifications
b. Determining the slope alpha, the area A and the slip mass of the slip mass through field survey and mappingUpper side area AuThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I;
c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1;
P＝TR/G0.5formula 1
In the formula:
p is early warning comprehensive discrimination factor;
t is a terrain factor which is determined by calculation according to the formula 2;
r is a rainfall factor, and is determined by calculation according to formula 4;
g is a geological factor which is determined by calculation according to the formula 5;
t ═ tan (α) +3.33U formula 2
In the formula:
alpha-the slope of the landslide body;
u is an upward steep terrain factor, and is determined by calculation according to the formula 3;
U＝sin(β)Aua formula 3
In the formula:
Auupper side area of the landslide body, m2；
A-area of the landslide mass, m2；
Beta-the upper side slope of the landslide body;
R＝(I/I0)(D/D0)0.8formula 4
In the formula:
i-average intensity of rainfall, mm/h;
I0the local maximum rainfall average value of 1 hour is searched by a local hydrological manual, and the average value is mm/h;
d-duration of rainfall, h;
D0-unit time, 1 h;
in the formula:
d. and dividing the early warning grade of the rock landslide on the sliding surface of the weak interlayer into four grades by using an early warning comprehensive discrimination factor P.
In the step d, when the early warning comprehensive judgment factor P is larger than 7.6, the possibility is very high; when the early warning comprehensive discrimination factor is more than 6.2 and P is less than or equal to 7.6, the possibility is high; when the early warning comprehensive discrimination factor is more than 4.8 and P is less than or equal to 6.2, the possibility is moderate; when the early warning comprehensive discrimination factor P is less than or equal to 4.8, the possibility is low.
The invention is suitable for early warning of the rock landslide with the sliding surface being the weak interlayer in the bedding landslide type, wherein the sliding surface is the weak interlayer formed by the soft rock after softening or argillization.
The basic principle of the invention is as follows:
sliding surfaces of rock landslides are generally of three types: a soft interlayer sliding surface, a rock stratum sliding surface and a joint surface sliding surface. The gliding plane of the rock landslide in the red zone belongs to the gliding plane of the weak interlayer, but the gliding plane of the weak interlayer not only has the gliding plane of the softened mudstone in the red zone, but also can comprise the gliding planes of other soft rocks such as tuff and the like.
The sliding surface of the weak interlayer is formed by softening and argillization of soft rocks such as mudstone and tuff through diagenesis, tectonic action, epibiotic action and the like. The sliding surface belongs to a soft structural surface, the inclination angle of the sliding surface is the same as that of a rock stratum, and the sliding surface belongs to a bedding landslide; the sliding surface has smaller inclination angle and develops in a nearly horizontal or slowly inclined layered slope. The sliding surface is flat and smooth, the clay mineral content is high, and the combination degree is extremely poor. The sliding surface has small shear strength, and the shear strength is obviously reduced after the sliding surface meets water.
The soft interlayer sliding surface rock landslide comprises rock in red zone, but the soft interlayer sliding surface landslide also comprises the landslide of other soft rock sliding surfaces such as tuff, and the application range is wider. And the sliding surface of the rock quality in the red zone is formed by argillized mudstone, the clay mineral content of the sliding surface is higher, and the combination degree is worse. The sliding surface has smaller shear strength, and the shear strength obviously drops to a larger extent after meeting water.
The slip plane characteristics determine the ease of landslide, while the shear strength of the topsoil of the weak sandwich slip plane determines the slip plane characteristics. The shear strength parameter is closely related to water, the clay mineral in the clay soil absorbs water and disintegrates, the microstructure changes, and the mechanical property is obviously reduced. Generally, the stability of the rocky landslide is higher when the slipband soil is in a natural state, and as the water saturation time is prolonged, such as after rainfall or water soaking, the cohesive force c of a shear strength parameter, and the friction angle of the slipband soil
The value of (A) is gradually reduced, the stability of the landslide is correspondingly reduced, and when the water saturation time is 1 day, the stability of the landslide reaches a limit equilibrium state. Of the two parameters of the shear strength, the cohesive force c is relatively minor, the influence on the landslide is small, and the friction angle of the slip zone soil is small
The change in (2) has a great influence on the landslide. Therefore, the cohesive force c can be ignored, and only the friction angle of the slippery soil is considered
The effect of the change of (c) is sufficient. The rock landslide on the sliding surface of the weak interlayer does not lose stability in a natural state; under rainfall conditions, water infiltrates into the sliding surface along the trailing edge cracks, causing the sliding soil to soak water, and the friction angle of the sliding soil increases with the time of soaking water
Gradually decrease, and the landslide gradually becomes unstable and slides down. Friction angle of sliding zone soil when landslide is unstable
The value of (A) can accurately reflect the slipInfluence of the moving surface on the landslide, equation 4 Friction Angle of the Slug soil
The influence of geological factors is fully considered in consideration of the value of (A), and the interrelation and importance of each influence factor are reflected. The terrain with steep upper part and slow lower part is favorable for rainwater to enter a potential landslide body through a crack at the upper part of the landslide body, so that a soft surface of a rock stratum is gradually saturated and softened, the shear strength is gradually reduced, the shear fracture is generated in the local part of the soft surface, rainwater continuously enters the cracks to saturate, the pore water pressure is increased to form super-pore water pressure, the shear fracture is gradually expanded and communicated to form a shear surface, the strength of the soft surface is further reduced, and finally, a local soil body slides down along a sliding belt because the shear strength of the shear surface is lower than the shear stress. The lower side face is usually the position of a cut outlet of a landslide body, rainwater permeates into a soil body and goes down along a slope to form a shear surface, and then the rainwater is easier to penetrate and seep out at the position of the face, so that the slope body slides down. Therefore, the slope, the upper steep slope, the lower free surface topography, and the like all play a role in landslide, but the influence of the slope is the greatest. The formula 2 completely combines the slope and the uphill steep terrain conditions, comprehensively considers the effect of terrain factors and embodies the interrelation and importance of various influence factors.
Rainfall is an inducing factor of the landslide, and the rainfall for a long time enables rainwater to enter the sliding surface and soften the weathered sliding surface, so that the strength and the friction force of the sliding surface are reduced, and the resistance is reduced for the sliding of the landslide; the larger average rainfall intensity enables the water level of the rear edge crack of the landslide body to rise, and the larger hydrostatic pressure provides power for the sliding of the landslide; the local 1-hour maximum rainfall average value represents rainfall characteristics of different areas, and the local 1-hour maximum rainfall average value is introduced to reduce the difference of rainfall in the areas to the maximum extent, so that the forecasting method can be used for each area.
The beneficial effects of the invention are mainly shown in the following aspects:
firstly, the invention 'a' finds the position of the sliding surface of the landslide through field investigation, determines the position as the sliding surface of the weak interlayer, takes the sample of the slip belt soil, and puts the slip beltSoaking the soil sample indoors, and measuring the friction angle of the slippery soil after 24 hours of soaking in water according to the geotechnical experiment specification
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I; c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1; d. the early warning comprehensive discrimination factor P is used for dividing the early warning grade of the rocky landslide of the sliding surface of the weak interlayer into four grades, the sliding surface characteristics, the terrain conditions and the rainfall conditions formed by the rocky landslide of the sliding surface of the weak interlayer are researched, the comprehensive judgment is made for the occurrence of the landslide, an accurate early warning calculation model of the rocky landslide of the sliding surface of the weak interlayer is established, and the early warning effect on the rocky landslide of the sliding surface of the weak interlayer is good.
In the step d, the early warning comprehensive judgment factor P is more than 7.6, so that the possibility is high; p is more than 6.2 and less than or equal to 7.6 of the early warning comprehensive discrimination factor, and the possibility is high; the early warning comprehensive discrimination factor P is more than 4.8 and less than or equal to 6.2, and the possibility is moderate; when the early warning comprehensive discrimination factor P is less than or equal to 4.8, the probability is low, geological, terrain and rainfall influence factors of the rocky landslide of the sliding surface of the soft interlayer are comprehensively considered, the landslide occurrence probability is accurately divided in a quantitative mode, and the early warning effect is guaranteed.
Thirdly, the invention carries out internal mechanism research by researching the influence degree of geological factors on landslide, and measures the friction angle of the slippery soil after soaking in water for 24 hours
The geological factor calculation formula of the rock landslide of the sliding surface of the weak interlayer is established.
In the invention, the terrain factor T, the rainfall factor R and the geological factor G in the formula 1 are dimensionless parameters, can be used in the soft interlayer sliding surface type rock landslide under various rock landslide conditions, and have strong applicability.
The method is suitable for early warning of the rock landslide with the sliding surface being the weak interlayer in the bedding landslide type, the sliding surface is the weak interlayer formed by soft rocks after softening or argillization, the early warning application range is wider than that of the rock landslide in red zone, and the applicability is strong.
Detailed Description
Example 1
A rock landslide early warning method for a soft interlayer sliding surface comprises the following steps:
a. finding the position of the sliding surface of the landslide through field investigation, taking a slip-band soil sample after determining the slip-band soil sample as the sliding surface of the soft interlayer, soaking the slip-band soil sample indoors with water, and measuring the friction angle of the slip-band soil after 24 hours of soaking with water according to geotechnical experiment specifications
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I;
c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1;
P＝TR/G0.5formula 1
In the formula:
p is early warning comprehensive discrimination factor;
t is a terrain factor which is determined by calculation according to the formula 2;
r is a rainfall factor, and is determined by calculation according to formula 4;
g is a geological factor which is determined by calculation according to the formula 5;
t ═ tan (α) +3.33U formula 2
In the formula:
alpha-the slope of the landslide body;
u is an upward steep terrain factor, and is determined by calculation according to the formula 3;
U＝sin(β)Aua formula 3
In the formula:
Auupper side area of the landslide body, m2；
A-area of the landslide mass, m2；
Beta-the upper side slope of the landslide body;
R＝(I/I0)(D/D0)0.8formula 4
In the formula:
i-average intensity of rainfall, mm/h;
I0the local maximum rainfall average value of 1 hour is searched by a local hydrological manual, and the average value is mm/h;
d-duration of rainfall, h;
D0-unit time, 1 h;
in the formula:
d. and dividing the early warning grade of the rock landslide on the sliding surface of the weak interlayer into four grades by using an early warning comprehensive discrimination factor P.
A, finding the position of the sliding surface of the landslide through field investigation, taking a slip-band soil sample after determining the position as the sliding surface of the soft interlayer, soaking the slip-band soil sample in water indoors, and measuring the friction angle of the slip-band soil according to geotechnical experiment specifications after 24-hour water soaking
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I; c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1; d. the early warning comprehensive discrimination factor P is used for dividing the early warning grade of the rocky landslide of the sliding surface of the weak interlayer into four grades, the sliding surface characteristics, the terrain conditions and the rainfall conditions formed by the rocky landslide of the sliding surface of the weak interlayer are researched, the comprehensive judgment is made for the occurrence of the landslide, an accurate early warning calculation model of the rocky landslide of the sliding surface of the weak interlayer is established, and the early warning effect on the rocky landslide of the sliding surface of the weak interlayer is good.
Example 2
A rock landslide early warning method for a soft interlayer sliding surface comprises the following steps:
a. finding the position of the sliding surface of the landslide through field investigation, taking a slip-band soil sample after determining the slip-band soil sample as the sliding surface of the soft interlayer, soaking the slip-band soil sample indoors with water, and measuring the friction angle of the slip-band soil after 24 hours of soaking with water according to geotechnical experiment specifications
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I;
c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1;
P＝TR/G0.5formula 1
In the formula:
p is early warning comprehensive discrimination factor;
t is a terrain factor which is determined by calculation according to the formula 2;
r is a rainfall factor, and is determined by calculation according to formula 4;
g is a geological factor which is determined by calculation according to the formula 5;
t ═ tan (α) +3.33U formula 2
In the formula:
alpha-the slope of the landslide body;
u is an upward steep terrain factor, and is determined by calculation according to the formula 3;
U＝sin(β)Aua formula 3
In the formula:
Auupper side area of the landslide body, m2；
A-area of the landslide mass, m2；
Beta-the upper side slope of the landslide body;
R＝(I/I0)(D/D0)0.8formula 4
In the formula:
i-average intensity of rainfall, mm/h;
I0the local maximum rainfall average value of 1 hour is searched by a local hydrological manual, and the average value is mm/h;
d-duration of rainfall, h;
D0-unit time, 1 h;
in the formula:
d. and dividing the early warning grade of the rock landslide on the sliding surface of the weak interlayer into four grades by using an early warning comprehensive discrimination factor P.
In the step d, when the early warning comprehensive judgment factor P is larger than 7.6, the possibility is very high; when the early warning comprehensive discrimination factor is more than 6.2 and P is less than or equal to 7.6, the possibility is high; when the early warning comprehensive discrimination factor is more than 4.8 and P is less than or equal to 6.2, the possibility is moderate; when the early warning comprehensive discrimination factor P is less than or equal to 4.8, the possibility is low.
In the step d, when the early warning comprehensive judgment factor P is more than 7.6, the possibility is very high; when the early warning comprehensive discrimination factor is more than 6.2 and P is less than or equal to 7.6, the possibility is high; when the early warning comprehensive discrimination factor is more than 4.8 and P is less than or equal to 6.2, the possibility is moderate; when the early warning comprehensive discrimination factor P is less than or equal to 4.8, the probability is low, geological, terrain and rainfall influence factors of the rocky landslide of the sliding surface of the soft interlayer are comprehensively considered, the landslide occurrence probability is accurately divided in a quantitative mode, and the early warning effect is guaranteed.
The internal mechanism research is carried out by researching the influence degree of geological factors on landslide, and the friction angle of the tyre soil is measured after soaking in water for 24 hours
The geological factor calculation formula of the rock landslide of the sliding surface of the weak interlayer is established.
The terrain factor T, the rainfall factor R and the geological factor G in the formula 1 are dimensionless parameters, can be used in rock landslides of the weak interlayer sliding surface type under various rock landslide conditions, and have strong applicability.
The rock landslide probability of each distribution area in the following table 1 is calculated and divided by adopting the method.
The slope units involved in the calculation include at the area 33 where potential landslides are selected. Firstly, determining the characteristics of the sliding surface, and measuring the friction angle of the sliding soil after determining the characteristics as the sliding surface of the soft interlayer
Respectively measuring the slope alpha of the sliding mass in each small area, and then measuring the area A of the sliding mass in the small area, the slope beta of the upper side surface of the sliding mass in the small area and the area Au of the upper side surface of the sliding mass in the small area; for computing potential landslides by interpolationThe rainfall duration D and the average rainfall intensity I are calculated by the formula 2 to obtain a terrain factor T, the formula 4 to obtain a rainfall factor R and the formula 5 to obtain a geological factor G. And finally, calculating an early warning comprehensive discrimination factor P by the formula 1. The terrain factor T, the rainfall factor R, the geological factor G, the early warning comprehensive discrimination factor P calculation and landslide possibility division table at the position 33 and the actual occurrence condition of landslide are shown in the table 1.
TABLE 1
Criteria are divided according to likelihood: when P > 7.6, the probability is high; when P is more than 6.2 and less than or equal to 7.6, the possibility is high; when P is more than 4.8 and less than or equal to 6.2, the possibility is moderate; when P is less than or equal to 4.8, the possibility is low. The P value calculation results in table 1 show: in the potential slip mass at 33, there is a high probability of region 14, a high probability of region 2, a medium probability of region 8, and a low probability of region 9.
Compared with the actual occurrence situation, all 14 slopes with high possibility have landslide, see table 1; all 2 slopes with high possibility have landslide, see table 1; 2 slopes with medium possibility and 6 slopes without landslide appear in 8 slopes with medium possibility, which is shown in table 1; all 9 slopes with low probability do not have landslides, see table 1; in conclusion, the early warning effect of the method on the rock landslide on the sliding surface of the weak interlayer is better.
Claims (2)
1. A rock landslide early warning method for a soft interlayer sliding surface is characterized by comprising the following steps:
a. finding skis by field investigationAfter the position of the sliding surface of the slope is determined to be the sliding surface of the soft interlayer, a slip soil sample is taken, the slip soil sample is subjected to water soaking treatment indoors, and after 24 hours of water soaking, the friction angle of the slip soil is measured according to geotechnical experiment specifications
b. Determining the slope alpha of the landslide body, the area A of the landslide body and the upper side area A of the landslide body through on-site survey and mappinguThe slope beta of the upper side surface of the landslide body; monitoring rainfall to obtain rainfall duration D and rainfall average intensity I;
c. calculating early warning comprehensive discrimination factor P of landslide according to friction angle of slide zone soil
Calculating and determining a terrain factor T and a rainfall factor R according to the formula 1;
P＝TR/G0.5formula 1
In the formula:
p is early warning comprehensive discrimination factor;
t is a terrain factor which is determined by calculation according to the formula 2;
r is a rainfall factor, and is determined by calculation according to formula 4;
g is a geological factor which is determined by calculation according to the formula 5;
t ═ tan (α) +3.33U formula 2
In the formula:
alpha-the slope of the landslide body;
u is an upward steep terrain factor, and is determined by calculation according to the formula 3;
U＝sin(β)Aua formula 3
In the formula:
Auupper side area of the landslide body, m2；
A-area of the landslide mass, m2；
Beta-the upper side slope of the landslide body;
R＝(I/I0)(D/D0)0.8formula 4
In the formula:
i-average intensity of rainfall, mm/h;
I0the local maximum rainfall average value of 1 hour is searched by a local hydrological manual, and the average value is mm/h;
d-duration of rainfall, h;
D0-unit time, 1 h;
in the formula:
d. dividing the early warning grade of the rock landslide on the sliding surface of the weak interlayer into four grades by using an early warning comprehensive discrimination factor P;
in the step d, when the early warning comprehensive judgment factor P is larger than 7.6, the possibility is very high; when the early warning comprehensive discrimination factor is more than 6.2 and P is less than or equal to 7.6, the possibility is high; when the early warning comprehensive discrimination factor is more than 4.8 and P is less than or equal to 6.2, the possibility is moderate; when the early warning comprehensive discrimination factor P is less than or equal to 4.8, the possibility is low.
2. The application of the rock landslide of the soft interlayer sliding surface according to claim 1, wherein the early warning method comprises the following steps: the method is suitable for early warning of the rock landslide with the soft interlayer on the sliding surface in the bedding landslide type, wherein the sliding surface is the soft interlayer formed by soft rocks after softening or argillization.
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| CN201910516392.XA CN110412241B (en) | 2019-06-14 | 2019-06-14 | Early warning method for rocky landslide of soft interlayer sliding surface and application of early warning method |
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