CN109190294A - A kind of reservoir level huge thicker landslide cuts the design of slope Scheme of Strengthening and optimization method under the conditions of changing - Google Patents
A kind of reservoir level huge thicker landslide cuts the design of slope Scheme of Strengthening and optimization method under the conditions of changing Download PDFInfo
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Abstract
A kind of reservoir level cuts the design of slope Scheme of Strengthening and optimization method in huge thicker landslide under the conditions of changing, comprising: to landslide during reservoir filling, determine huge thick landslide cuts slope controlled load case；Draw the residual pushing force curve of different water levels；It according to residual pushing force curve, determines that landslide promotees sliding fragment position, and then determines that concentrating on landslide promotees cutting slope position and cutting slope order for sliding section；Determine the location parameter, geometric parameter and parameter variation range for cutting slope scheme；The groundwater saturation line on huge thicker landslide is obtained using numerical simulation, the coefficient of stability for respectively cutting slope scheme is calculated using coefficient transfer method, slope side's amount is cut with method of geometry calculating, obtains cutting slope effect.The optimization method combined using artificial neural network and genetic algorithms determined and cuts mapping relations between the location parameter, geometric parameter and optimization aim of slope scheme, in conjunction with design safety factor (DSF), is determined and optimal is cut slope scheme.Under the conditions of this method can be such that reservoir level changes, the slope scheme of cutting on huge thicker landslide achievees the effect that safety and economy.
Description
Technical field
The present invention relates to bank slope of reservoir hazards control fields, and in particular to huge thicker under the conditions of a kind of reservoir level changes
Cut the design of slope Scheme of Strengthening and optimization method in landslide.
Background technique
Studies have shown that reservoir level variation cause WATER LEVEL CHANGES be induce reservoir bank landslide unstability sliding an important factor for it
One.The improvement of huge thicker talus slide under the existing influence of fluctuations about reservoir level, main use cut slope off-load and its
The comprehensive treatment method that his measure (backfill, draining, supporting and retaining system etc.) combines reinforces landslide.The method for cutting slope off-load exists
It is technically simple and easy, experience abundant is widely applied and had accumulated in engineering, is a kind of cost-effective cunning
Slope control measure.But in cutting slope engineering, cut slope side amount it is too small, then expected purpose is not achieved, cut slope side amount it is excessive, will
Cause harnessing project cost unreasonable.Therefore, the key for cutting slope derated design is to obtain the most economical and reaches expected steady
That determines effect cuts slope scheme, thus cut slope position determine and cut slope scheme optimization design it is particularly important.
Scheme of Strengthening of many scholars for huge thick landslide under Reservoir Water Level at present, rule of thumb selectes mostly and cuts slope
The gradient and scale, influence about groundwater level fluctuation to Landslide Stability and cut the research of slope scheme optimization and few and big
Majority is conceived to each stick individually side's of cutting amount, cause entirely to come down to cut slope surface irregular, machine is not easy in digging process
Toolization construction.
Summary of the invention
The slope of cutting on huge thicker landslide adds under the conditions of changing technical problem to be solved by the invention is to provide a kind of reservoir level
Gu conceptual design and optimization method, under the conditions of this method can be such that reservoir level changes, the slope scheme of cutting on huge thicker landslide reaches safety
With economic effect.According to the failure mechanism under the effect of its library water, its Landslides is determined, find its corresponding least favorable peace
Thus total state calculates it and cuts slope controlled load case, and propose and substantially cut cutting for slope position according to residual pushing force curve determination
Slope method has formulated practicable concentrate on and has promoted to cut slope scheme in sliding segment limit, and optimized analysis to slope scheme is cut
Research.Achieve the effect that not only economical but also stable.
In order to achieve the above objectives, the technical scheme adopted by the invention is as follows:
A kind of reservoir level huge thicker landslide cuts the design of slope Scheme of Strengthening and optimization method, including following step under the conditions of changing
It is rapid:
Step 1: to landslide during reservoir filling, the stability under different working conditions carries out calculating analysis, thus
Determine huge thick landslide cuts slope controlled load case；Cutting slope controlled load case is the smallest operating condition of the coefficient of stability, i.e. the most unfavorable processing condition；
Step 2: using coefficient transfer method, calculate residual pushing force of the huge thicker landslide in the case where cutting slope controlled load case, draw huge
Thicker comes down in the case where cutting slope controlled load case, the residual pushing force curve of different water levels；
Step 3: according to residual pushing force curve, determining that landslide promotees sliding fragment position, and then determine that concentrating on landslide promotees sliding section
Cut and slope position and cut slope order；
Step 4: in conjunction with huge thicker landslide form, determining the location parameter, geometric parameter and Parameters variation model for cutting slope scheme
It encloses；
Step 5: using uniform design, that tentatively drafts huge thick landslide cuts slope scheme；Select two suitably uniformly
Table is designed, uniform design sample plan is calculated and as a result, is respectively used to cut slope Dominated Factors about level and cuts slope result
Between neural network model training and the neural network model training process in forecast test.
Step 6: the groundwater saturation line on huge thicker landslide being obtained using numerical simulation, is respectively cut using coefficient transfer method calculating
The coefficient of stability of slope scheme cuts slope side's amount with method of geometry calculating, and obtain different schemes cuts slope effect.
Step 7: the coefficient of stability is greater than design safety factor (DSF) and cuts slope side's amount minimum, is the optimization aim for cutting slope scheme；It adopts
The optimization method combined with artificial neural network and genetic algorithms determines the location parameter for cutting slope scheme, geometric parameter and optimization mesh
Mapping relations between mark are determined and optimal cut slope scheme in conjunction with design safety factor (DSF).
What huge thicker came down under the conditions of a kind of reservoir level of the present invention changes cuts the design of slope Scheme of Strengthening and optimization method, beneficial
Effect is as follows:
(1): the present invention substantially cuts slope position according to residual pushing force curve determination, has formulated practicable concentrate on and has promoted
Cut slope scheme in sliding segment limit, the method efficiently, economy, strong operability, slope leveling is cut, convenient for construction；
(2): design is scientific and reasonable for the solution of the present invention, and effect of optimization is good, to cutting after slope scheme optimizes analysis and research
Not only economy can be searched out in given range but also meets the optimal of the coefficient of stability cuts slope scheme.
(3): the present invention can provide reliable method branch for the slope scheme optimization design of cutting of reservoir zone large size landslide o earth slope
Support, Practical significance with higher.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is the stream for cutting the design of slope Scheme of Strengthening and optimization method on huge thicker landslide under the conditions of reservoir level of the present invention changes
Cheng Tu.
Fig. 2 is the residual pushing force curve figure of the embodiment.
Fig. 3 is that the embodiment cuts slope conceptual design figure.
Fig. 4 is that the slope surface of cutting of the embodiment accumulates schematic diagram.
Fig. 5 is the calculating component of the embodiment.
Fig. 6 is artificial neural network structure's figure of the embodiment.
Specific embodiment
Example of the invention is described in detail now in conjunction with the drawings and specific embodiments so that advantages of the present invention and
Feature can be easier to be readily appreciated by one skilled in the art, to make apparent specific boundary to protection scope of the present invention
It is fixed.
As shown in Figure 1, a kind of reservoir level huge thicker landslide cuts the design of slope Scheme of Strengthening and optimization method under the conditions of changing,
The following steps are included:
Step 1: to landslide during reservoir filling, the stability under different working conditions is carried out using coefficient transfer method
Analysis is calculated, so that it is determined that slope controlled load case is cut on huge thick landslide；Cutting slope controlled load case is the smallest operating condition of the coefficient of stability, i.e.,
The most unfavorable processing condition.Calculation formula is as follows:
Wi=γwViu+γsatVid (3)
Ti=Wisinθi (6)
In formula:
Ei--- the i-th stick residual pushing force works as EiWhen < 0, E is takeni=0, i.e. residual pushing force is not transmitted still further below；
Fi--- the coefficient of stability under the conditions of each water level；
Wi--- the i-th stick gliding mass is self-possessed (kN/m)；
ψi--- the i-th stick gliding mass sliding force carry-over factor；
Ri--- the i-th stick gliding mass skid resistance (kN/m)；
Ti--- the i-th stick gliding mass sliding force (kN/m)；
ci--- the unit cohesive strength (kPa) of sliding surface where the i-th stick；
li--- the length (m) of sliding surface where the i-th stick；
θi--- the inclination angle (°) of sliding surface where the i-th stick；
--- sliding surface internal friction angle (°) where the i-th stick.
Refer under different working conditions: different reservoir service conditions are different, reservoir in the process of running, on reservoir level has
Rising also has decline, and different SEA LEVEL VARIATION situations is referred to as different operating conditions.
Stability calculate analyzing and be referred to: being carried out stable calculation using coefficient transfer method, is a kind of general side
Method, formula such as above-mentioned formula (1)-(6).
Cut slope controlled load case to refer to: operating condition used in the scheme of slope, that is, the smallest operating condition of the coefficient of stability are cut in formulation, most
Dangerous working condition.
The smallest operating condition of the coefficient of stability refers to: different reservoir level buck stays, the stable case of reservoir bank landslide are not
With.The calculating that the coefficient of stability is carried out to all operating conditions selects the smallest be used as of the coefficient of stability to cut slope controlled load case.
Step 2: using coefficient transfer method, calculate residual pushing force of the huge thicker landslide in the case where cutting slope controlled load case, draw huge
Thicker comes down in the case where cutting slope controlled load case, the residual pushing force curve of different water levels.
Step 3: according to residual pushing force curve, determining that landslide promotees sliding fragment position, and then determine that concentrating on landslide promotees sliding section
Cut and slope position and cut slope order.
Step 4: in conjunction with huge thicker landslide form, determining the location parameter, geometric parameter and its variation range for cutting slope scheme.
Location parameter refers to: location parameter, that is, cuts slope range, that is, cuts the vertical control point during slope, such as rises
Point height, terminal elevation etc..
Geometric parameter refers to: during cutting slope, the gradient on the new slope of formation.
Parameter variation range refers to: cutting the starting point elevation on slope, terminal elevation, cuts the slope gradient etc. and cutting slope scheme Dominated Factors
Value range.
Step 5: using uniform design, that tentatively drafts huge thick landslide cuts slope scheme；Select two suitably uniformly
Table is designed, uniform design sample plan is calculated and as a result, is respectively used to cut slope Dominated Factors about level and cuts slope result
Between neural network model training and the neural network model training process in forecast test.
Uniform design is described as follows:
When cutting slope, in the change procedure for cutting slope location parameter and geometric parameter, the combination for cutting slope scheme Dominated Factors has
It is countless, rationally to reflect all Dominated Factors being likely to occur combination, maximum information is obtained with less combination number
Amount, using uniform design, that tentatively drafts huge thick landslide cuts slope scheme.Detailed process is as follows:
1, select the location parameter for cutting slope and geometric parameter as cutting slope variable, i.e. the two of uniform design factor.
2, the respective value range of the two factors is determined, then taking N number of discrete value within this range, (N is the two
The number of levels of factor)；
3, according to factor number, number of levels, in conjunction with uniform designs table (the general uniform designs table mathematically provided), selection
Two suitable uniform designs tables carry out factor and horizontal combination, obtain the uniform designs table for cutting slope scheme.
4, according to uniform designs table, every kind of stabilization for cutting slope scheme is calculated in uniform designs table using coefficient transfer method
Coefficient calculates the slope side of cutting that every kind is cut slope scheme using method of geometry and measures.
5, using each scheme cut slope variable (location parameter and geometric parameter of cutting slope) and calculate obtain the coefficient of stability and
The amount combination of slope side is cut, the location parameter for cutting slope and geometric parameter and stability of slope system are established using neural network and genetic algorithm
Count and cut the mapping relations between slope side's amount.
Level is cut slope Dominated Factors and is referred to: cutting location parameter, the geometric parameter on slope, such as cuts starting point elevation, the terminal on slope
Elevation cuts the slope gradient etc. and cuts slope scheme Dominated Factors.
Step 6: the groundwater saturation line on huge thicker landslide being obtained using numerical simulation, is respectively cut using coefficient transfer method calculating
The coefficient of stability of slope scheme cuts slope side's amount with method of geometry calculating, and obtain different schemes cuts slope effect.
The coefficient of stability refers to: the stable state evaluation index for coming down current, is a numerical value, indicates currently steady that come down
Determine degree.
Method of geometry refers to: being obtained according to the size quantity on CAD diagram or is acquired by area formula.Because being two dimensional cross-section
It calculates, cuts slope side's amount with cutting slope surface product representation, it is possible to be indicated with CAD amount area.
Cut slope side's amount: cut slope side's amount generally indicates that unit is m with volume3.Because the present invention uses two dimensional cross-section meter
It calculates, the numerical value for cutting slope side's amount of unit width is equal with the numerical value for cutting slope surface product, cuts that slope side's amount is available to cut slope surface product representation, list
Position is m2。
Cut slope effect to refer to: cutting slope side's amount and cut the coefficient of stability behind slope, respectively indicate cut the economy of slope scheme with
Safety.
Step 7: the coefficient of stability is greater than design safety factor (DSF) and cuts slope side's amount minimum, is the optimization aim for cutting slope scheme；It adopts
The optimization method combined with artificial neural network and genetic algorithms determines the location parameter for cutting slope scheme, geometric parameter and optimization mesh
Mapping relations between mark are determined and optimal cut slope scheme in conjunction with design safety factor (DSF).
Design safety factor (DSF) refers to: the stability series numerical value after a landslide control as defined in related specifications, expression are
Stable state after landslide control.
In the step 1: determining and cut slope controlled load case, the coefficient of stability under more various operating conditions, wherein the coefficient of stability is most
Small operating condition is to cut slope controlled load case.
In the step 3: when SEA LEVEL VARIATION, there is multiple ascent stages and descending branch in residual pushing force curve；Smooth slope side
It is in substantial increase trend to residual pushing force curve, sliding force is greater than skid resistance, belongs to the sliding section of rush；It is remaining along sliding direction
Pushing force curve is on a declining curve, and skid resistance is greater than sliding force, belongs to anti-skid section；In order to improve landslide in the reservoir runtime
Overall stability, cutting slope region should concentrate on promoting sliding section.If multiple ascent stages and descending branch occurs in residual pushing force curve, it is
It is easy for construction, only consider the sliding section of rush for being slightly above normal pool level or more.
In the step 3: the slope wave of consideration reservoir operation is climbed and safe superelevation, to avoid underwater construction, by the area Xiao Po
Domain controls in the slightly higher region of normal pool level.
It cuts slope region to refer to: carrying out cutting region involved in the engineering measure of slope.The present invention selects a little higher than normal storage
The sliding section of the rush of water level is as the main region for cutting slope.
In the step 4: being accounted for using soil strength provided by cohesion as reserve strength, in order to enable cutting slope
Slope surface afterwards is able to maintain that from surely, can be determined as the gradient corresponding to soil body internalfrictionangleφ to cut the maximum slope of slope oblique line
Value, and the gradient on landslide surface is combined, determine the slope minimum value for cutting slope oblique line.
In the step 6: cutting slope effect and generally by Landslide Stability and cut slope project amount and measure.Choose two dimensional cross-section
It is calculated, using landslide form mechanism coefficient and cuts slope surface product S as measurement and cut the index of slope effect.
In the step 7: using artificial neural network, establish and cut slope surface product S and coefficient of stability FSBetween it is non-linear
Mapping relations.(slope surface product S and coefficient of stability F is cut to by one group of given input (cutting slope scheme Dominated Factors) and its outputS)
Identified special value space, establishes artificial nerve network model, by carrying out learning and memory to a certain number of samples,
Find out the characteristic relation (mapping) between outputting and inputting.
In the step 7: when determining best input parameter: the coefficient of stability is greater than design safety factor (DSF) as constraint item
Part cuts slope surface product value as initial area S using the minimum occurred in the scheme of uniform design0, to i1、xbAnd i2In Parameters variation model
Interior progress first time parametric inversion is enclosed, a series of i of schemes is obtained1、xbAnd i2Value and each scheme it is corresponding cut slope surface product
With the coefficient of stability；
The minimum value and S of slope surface product will be cut in each scheme obtained after first time inverting0Value compare, between the two compared with
Small value is used as S1, design safety factor (DSF) is greater than with the coefficient of stability and cuts slope surface product less than S1For constraint condition, to i1、xbAnd i2Into
Second of parametric inversion of row, obtains a series of i1、xbAnd i2Value and each scheme it is corresponding cut slope surface product and the coefficient of stability；
Slope surface product minimum value and S are cut by what is obtained after second of calculating inverting1Value compare, the smaller value between the two is
S2, design safety factor (DSF) is greater than with the coefficient of stability and cuts slope surface product less than S2For constraint condition, to i1、xbAnd i2Carry out third time
Parametric inversion；
And so on, multiple inverting is carried out, finally obtains and cuts the slope scheme coefficient of stability slightly larger than design safety factor (DSF), and cut
Slope surface product is the smallest to cut slope scheme.
In conjunction with the embodiments one, specifically illustrate the method for the invention.
Reservoir area of Three Gorges huge thick landslide gliding mass lengthwise 550m, 350~470m of width, area about 0.25km2, average thickness reaches
To 47.2m, gliding mass substance is mainly spallation structure and Rock-mass with cataclastic texture, belongs to the huge thicker under reservoir level influence of fluctuations
Talus slide.Its physical and mechanical parameter is as shown in table 1.
1 landslide-slip zone of table and gliding mass physical and mechanical parameter table
According to the landslide actual conditions, and combine previous similar engineering experience, slope principle is cut in design: first determining influences landslide
Stable the most unfavorable processing condition determines the approximate location for cutting slope by the residual pushing force curve under this operating condition, proposes to promote sliding section
Sublevel in range cuts slope mode；In conjunction with landslide morphological feature and local stability requirement, the Dominated Factors for cutting slope scheme are determined
And its optimization range；It is designed using Uniform ity Design Method to slope scheme is cut, acquisition is a series of to cut slope scheme；Using limited
First method and limit equilibrium method calculate the phreatic line and the coefficient of stability for each cutting slope scheme；And pass through neural network and heredity
The Meta-Synthesis Method that algorithm combines optimizes analysis to slope scheme is cut, obtains meeting design safety factor (DSF) and cut slope side
Measure it is the smallest cut slope scheme, i.e., it is optimal to cut slope scheme.
Step 1: in conjunction with the scheduling scheme of Three Gorges Reservoir, the coefficient of stability to come down under different operating conditions: reservoir level is calculated
175m, rate of climb 1m/d, the coefficient of stability 1.14 are risen to from 145m；Reservoir level is down to 145m from upstream water level 175m,
When decrease speed 1.2m/d, the coefficient of stability 1.11；Reservoir level is down to 145m from 162m, coefficient of stability when decrease speed 2m/d
It is 1.12.Wherein the smallest operating condition of the coefficient of stability is down to 145m, decrease speed 1.2m/d from 175m for reservoir level, it is thus determined that
It cuts slope controlled load case for the present invention.
Step 2: slope controlled load case being cut according to identified above, draws the residual pushing force curve of different periods under this operating condition
(Fig. 2), in the present embodiment, every 2 days of residual pushing force curve (Drawdown of Reservoir Water Level 2.4m) draw primary.
Step 3: reservoir area of Three Gorges ordinary water level is that 175m is flooded to 175m or less part periodic when water level fluctuation of reservoir
Not yet.To avoid underwater construction, the position elevation of slope excavating should be greater than 175m, and according to operating condition 2, (reservoir level declines from 175m
The residual pushing force curve (Fig. 2) to come down under to 145m, speed 1.2m/d).With the variation of reservoir level, remaining sliding force
Curve shows certain part up and down.In Fig. 5, region I (abscissa in region I 186.5m~296.0m it
Between) and region III (abscissa of region III is between 416.0m~459.0m) residual pushing force curve with landslide surface height
Reduction and increase.In region I and region III, sliding force is greater than skid resistance, referred to as promotees sliding section.Conversely, region II (horizontal seat
Be marked between 296.0m~416.0m) residual pushing force curve reduce with the decline of landslide surface elevation.The antiskid of region II
Power is greater than sliding force, referred to as antiskid section.Consider the overall stability to come down in reservoir operational process, the area Xiao Po, which should concentrate on, to be promoted
Sliding section (region I and region III).
Step 4: according to the selection result for cutting slope position, cutting slope region and focus on region I, III.As shown in figure 3, cutting
Slope is divided into two ranks.The first rank for cutting slope scheme is to ream the region A '-A-B-C, and second-order is to ream the region C-D-E.By to cross
The part that coordinate value is less than A point abscissa carries out stable calculation, show that the gradient of 1:1.55 can satisfy local stability and want
It asks, therefore A ' is extended to 1: 1.55 gradient by point A, form excavation line AA '.Then from A strokes and dots straight line, with i1's
Slope extends downwardly into B point, and (abscissa is xb), intersect in the horizontal line that C strokes and dots one passes through B point with landslide surface.Second
Rank cuts the excavation line on slope from point C with i2Gradient extend to point D.In order to avoid underwater construction, the height of D point is set as
180 meters, higher than 175 meters of reservoir operation scheme.It is extended to and surface of coming down finally, drawing straight line in the horizontal direction from D point
Intersection.For above-mentioned slope excavating scheme, the major control factors for cutting slope are AB sections of gradient i1, B point abscissa xbAnd CD
The gradient i of section2。
For the sake of security, intensity provided by the internalfrictionangleφ of soil is only considered in stable calculation.In calculating, glue
Property soil provided by soil strength be used as after slope excavating holding from steady reserve strength.The internal friction angle of gliding mass soil is
32.8 °, it is the greatest gradient value for making landslide form mechanism that the gradient of corresponding excavation line AB ', which is 1:1.55,.The slope excavating gradient is less than 1
: when 1.55, stability of slope, conversely, side slope is by unstability after excavating.Therefore, i1And i2Greatest gradient value be confirmed as 1:1.55.
When B point is overlapped with C ' point (separation that C ' is region I and region II on landslide surface), the gradient of AC ' is 1:2.35.It calculates
Show that, when the AB sections of gradients are less than 1:2.35, skid resistance caused by earth excavation reduces the stability for being not sufficient to ensure that side slope.
Therefore, gradient i1Optimization range be 1:2.35~1:1.55.i2Minimum value be according to the gradient of second-order landslide surface determine
, gradient i2Optimization range be 1:2.39~1:1.55.
As can be seen from Figure 3, the abscissa x of B pointbRange is 262.0m~296.0m, when opening for the first rank slope excavating scheme
It digs area to fall in region I, and AB sections of gradient i1When being adjusted to AB sections of stable grade limit value 1:1.55, abscissa xbIt reaches
To maximum value.After the slope gradient for determining AB, if the abscissa x of B pointbWhen increasing to bigger by 296m, the soil of the excavation of region I
Side's amount is constant, and the earth volume that region II excavates increases.Therefore, xbUpper limit value be set as the line of demarcation of region I and region II
On, abscissa is 296m.By analyzing above, three major control factors of slope excavating scheme optimization can be determined (as schemed
Shown in 6, AB sections of grade of side slope i1, B point abscissa xbWith CD sections of grade of side slope i2)。
Step 5: according to uniform design principle, using uniform designs table U30(53), then it is representative to cut slope scheme only
30 kinds of schemes are needed, the quantity for cutting slope scheme is greatly reduced, it is not only representative, but also can rationally reflect all be likely to occur
Dominated Factors combination.
According to foregoing description, the optimization range of Dominated Factors is 1.55≤i1≤ 2.35,262.0≤xb≤ 292.0,1.55
≤i2≤ 2.39, three factors are evenly dividing into 5 levels, Dominated Factors water-glass is shown in Table 2.
Table 2 cuts slope scheme Dominated Factors water-glass
According to table 2, suitable uniform designs table U is selected30(53), be calculated uniform design sample plan and as a result,
For cutting slope Dominated Factors about level and cutting the training of the neural network model between the result of slope, concrete outcome is shown in Table 3.Choosing
Select uniform designs table U15(63), the sample for the forecast test in the neural network model training process is calculated, specifically
It the results are shown in Table 4.
Table 3 cuts slope scheme uniform designs table U30(53)
Table 4 cuts slope scheme uniform designs table U15(63)
Step 6: cutting slope effect and generally by Landslide Stability and cut slope project amount and measure.The present invention chooses two dimensional cross-section
It is calculated, therefore by landslide form mechanism coefficient and cuts slope surface product S (see Fig. 4) as measurement and cut the index of slope effect.This landslide meter
It calculates a component (see Fig. 5).
Stable calculation analysis is carried out to using the landslide of " cutting slope+draining " comprehensive control measures, cuts slope scheme for 30 kinds
Stability and the training sample (being shown in Table 5) that is used as of project amount analysis result, 15 kinds are cut the stability and project amount of slope scheme
Result is analyzed as test samples (being shown in Table 6).
5 30 kinds of stability for cutting slope scheme of table and project amount analyze result
6 15 kinds of stability for cutting slope scheme of table and project amount analyze result
Step 7: the present invention cuts the slope scheme Dominated Factors (gradient i of AB with artificial neural network foundation1, B point abscissa
xb, CD gradient i2) with cut slope surface product S and coefficient of stability FSBetween Nonlinear Mapping relationship.
By the preliminary analysis to result, promote sliding section cuts that slope surface product is bigger, and the coefficient of stability on landslide is bigger.When landslide
When the coefficient of stability reaches the safety coefficient 1.2 of code requirement, then increase cut slope side amount will improve project cost.For to cutting
The economy of slope scheme considers that prioritization scheme is met the requirements with stability, and corresponding slope surface of cutting accumulates the minimum target of S, meets
The slope scheme Dominated Factors of cutting of this condition are required.The coefficient of stability is greater than 1.2 and is used as constraint condition, with uniform design
It is initial area S that the minimum occurred in scheme, which cuts slope surface product value,0, to i1、xbAnd i2It is carried out for the first time in parameter variation range
Parametric inversion obtains a series of i of schemes1、xbAnd i2Value and each scheme it is corresponding cut slope surface product and the coefficient of stability；By
The minimum value and S of slope surface product are cut in each scheme obtained after inverting0Value compare, the smaller value between the two is as S1,
It is greater than 1.2 with the coefficient of stability and cuts slope surface product and is less than S1For constraint condition, to i1、xbAnd i2Second of parametric inversion is carried out, is obtained
To a series of i1、xbAnd i2Value and each scheme it is corresponding cut slope surface product and the coefficient of stability；It, will be second when third time inverting
What is obtained after calculating inverting cuts slope surface product minimum value and S1Value compare, the smaller value between the two be S2, big with the coefficient of stability
In 1.2 and cut slope surface product be less than S2For constraint condition, to i1、xbAnd i2Carry out parametric inversion；And so on, it carries out repeatedly anti-
It drills, finally obtains and cut the slope scheme coefficient of stability slightly larger than 1.2, and cut the smallest practicable arrangement and method for construction of slope surface product.
The present invention is optimized using artificial nerve network model to slope scheme is cut.Artificial nerve network model is by inputting
Layer, hidden layer and output layer composition.In artificial nerve network model, AB sections of grade of side slope i1, B point abscissa xbWith CD sections of sides
Slope gradient i2Belong to input layer, and cuts slope surface product S and cut the coefficient of stability F of slope schemeSBelong to output layer.Establish input data
(AB slope over 10 i1, B point abscissa xbWith CD slope over 10 i2) and output data (cut slope surface product S and coefficient of stability FS) between it is non-
Linear mapping relation.The structure chart of artificial neural network is as shown in Figure 6.Most using " artificial neural network-genetic algorithm " search
Excellent parameter (AB sections of slope i1, B point abscissa xbWith CD sections of slope i2), it obtains optimal cutting slope scheme.
The present invention summarizes the optimization process for cutting slope scheme:
(1) for training the determination of the sample of artificial nerve network model: 30 samples obtained from above-mentioned table 4 and 6 are used
In training artificial nerve network model.Table 4 determines 30 groups of input parameters with uniform design, with 6 institute of coefficient transfer method computational chart
The corresponding coefficient of stability shown is accumulated with slope surface is cut.
(2) artificial nerve network model is established.Node (H in artificial nerve network model (Fig. 6) hidden layer1, H2...,
I1, I2, I3...) number determined by genetic algorithm.Using test sample (table 5 and table 7) to artificial nerve network model can
It is examined with property, the results showed that the error of forecast test is 0.0063, illustrates established artificial nerve network model
(3-6-45-2) is suitable.
(3) the most preferably determination of input parameter.On the basis of artificial nerve network model, a series of experiments is carried out, directly
To the coefficient of stability very close 1.2, slope surface product minimum is cut, to obtain cutting the Optimum i on slope1、xbAnd i2Value.
Optimum results show i1、xbAnd i2Value be respectively 2.02,281.50m and 2.33, the corresponding coefficient of stability is
1.201, more slightly larger than design safety factor (DSF) 1.2 as defined in design specification, cutting slope surface product is 5237.0m2, reach safety requirements and
It is minimum to cut slope surface product.
Claims (7)
1. huge thicker landslide cuts the design of slope Scheme of Strengthening and optimization method under the conditions of a kind of reservoir level variation, it is characterised in that packet
Include following steps:
Step 1: to landslide during reservoir filling, the stability under different working conditions carries out calculating analysis, so that it is determined that
Cut slope controlled load case in huge thick landslide；
Step 2: using coefficient transfer method, calculate residual pushing force of the huge thicker landslide in the case where cutting slope controlled load case, draw huge thicker
Landslide is in the case where cutting slope controlled load case, the residual pushing force curve of different water levels；
Step 3: according to residual pushing force curve, determining that landslide promotees sliding fragment position, and then determine that concentrating on landslide promotees cutting for sliding section
Slope position and cut slope order；
Step 4: in conjunction with huge thicker landslide form, determining the location parameter, geometric parameter and parameter variation range for cutting slope scheme；
Step 5: using uniform design, that tentatively drafts huge thick landslide cuts slope scheme；
Step 6: the groundwater saturation line on huge thicker landslide being obtained using numerical simulation, slope side is respectively cut using coefficient transfer method calculating
The coefficient of stability of case cuts slope side's amount with method of geometry calculating, and obtain different schemes cuts slope effect；
Step 7: the optimization method combined using artificial neural network and genetic algorithms determines location parameter, the geometry for cutting slope scheme
Mapping relations between parameter and optimization aim are determined and optimal cut slope scheme in conjunction with design safety factor (DSF).
2. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 1: slope controlled load case, the coefficient of stability under more various operating conditions, wherein surely are cut in determination
Determining the smallest operating condition of coefficient is to cut slope controlled load case.
3. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 3: when SEA LEVEL VARIATION, there is multiple ascent stages and descending branch in residual pushing force curve；
It is in substantial increase trend along sliding direction residual pushing force curve, sliding force is greater than skid resistance, belongs to the sliding section of rush；
On a declining curve along sliding direction residual pushing force curve, skid resistance is greater than sliding force, belongs to anti-skid section；
Cutting slope region should concentrate on promoting sliding section, if residual pushing force curve appearance multiple ascent stages and descending branch, only consider slightly higher
The sliding section of rush more than normal pool level.
4. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 4: the gradient corresponding to soil body internalfrictionangleφ is determined as to cut the slope of slope oblique line
Maximum value, and the gradient on landslide surface is combined, determine the slope minimum value for cutting slope oblique line.
5. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 6: choosing two dimensional cross-section and calculated, and by landslide form mechanism coefficient and cuts slope surface product S work
To measure the index for cutting slope effect.
6. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 7: using artificial neural network, establishes and cut slope surface product S and coefficient of stability FSBetween
Nonlinear Mapping relationship；S and coefficient of stability F is accumulated to by one group of given cutting slope scheme Dominated Factors and its cut slope surfaceSInstitute is really
Fixed special value space, establishes artificial nerve network model, by carrying out learning and memory to a certain number of samples, finds out
Feature Mapping.
7. a kind of reservoir level slope Scheme of Strengthening of cutting that huge thicker comes down under the conditions of changing designs and optimizes according to claim 1
Method, it is characterised in that: in the step 7: when determining best input parameter: using the coefficient of stability be greater than design safety factor (DSF) as
Constraint condition cuts slope surface product value as initial area S using the minimum occurred in the scheme of uniform design0, to i1、xbAnd i2In parameter
First time parametric inversion is carried out in variation range, obtains a series of i of schemes1、xbAnd i2Value and each scheme is corresponding cuts slope
Area and the coefficient of stability；
The minimum value and S of slope surface product will be cut in each scheme obtained after first time inverting0Value compare, the smaller value between the two
As S1, design safety factor (DSF) is greater than with the coefficient of stability and cuts slope surface product less than S1For constraint condition, to i1、xbAnd i2Carry out second
Subparameter inverting obtains a series of i1、xbAnd i2Value and each scheme it is corresponding cut slope surface product and the coefficient of stability；
Slope surface product minimum value and S are cut by what is obtained after second of calculating inverting1Value compare, the smaller value between the two be S2, with
The coefficient of stability, which is greater than design safety factor (DSF) and cuts slope surface product, is less than S2For constraint condition, to i1、xbAnd i2It is anti-to carry out third subparameter
It drills；
And so on, multiple inverting is carried out, finally obtains and cuts the slope scheme coefficient of stability slightly larger than design safety factor (DSF), and cut slope surface
Product is the smallest to cut slope scheme.
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