CN107688895B - A kind of landslide safety analysis of frost thawing type and move distance measuring method - Google Patents
A kind of landslide safety analysis of frost thawing type and move distance measuring method Download PDFInfo
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Abstract
A kind of landslide safety analysis of frost thawing type and move distance measuring method belong to hazards control security technology area.The present invention includes two big computing modules, respectively safety computing module and move distance computing module, establishes rigid block movement model, calculates safety coefficient, determines that critical-temperature, temperature are more than critical-temperature, landslide failure.Wall element and module unit are divided to the landslide of above-mentioned unstability, calculate speed and distance in the motion process of landslide.The present invention can be 1:Fast Evaluation is carried out to the safety that frost thawing type comes down according to temperature change in 10000 frozen soil enumeration district figure amplitude ranges, evaluation efficiency is better than numerical simulation evaluation method 70%.Meanwhile can according to algorithm above to landslide can movable range calculate.
Description
Technical field
The present invention relates to a kind of landslide safety analysis of frost thawing type and move distance measuring methods, belong to hazards control
Security technology area is widely used in freeze thawing area landslide safety evaluatio and motion range assessment.
Background technology
Xinjiang, Qinghai, Tibet, Inner Mongol, Heilungkiang etc. are ever-frozen ground or seasonal frozen soil region, and solifluction and heat melt cunning
A series of frost thawing type landslide failure problems such as collapse increasingly are protruded, and are pacified to construction of the West Region, circuit traffic safety and resident's lives and properties
Serious threat is constituted entirely.Therefore, there is an urgent need to the safeties come down to frost thawing type in permafrost region to carry out the analysis of science and right
It can movable range calculated.
Different from other Landslides, temperature change is triggering frost thawing type key landslide factor, current frost thawing type landslide
Safety analysis is reduced to, containing saturation landslide computational methods, have ignored the influence of temperature more, and considers water, heat, couple of force and close
Numerical computation method is because theoretical too deep, and parameter is on the high side, and debugging process is excessively complicated, and multi-solution situation as a result is more universal, and
It cannot be understood by vast geology staff and use.
Meanwhile the move distance measuring method on domestic landslide is mostly used empirical statistics, but this be only it is coarse, it is inaccurate.
The Mechanics Calculation method being rapidly developed in the recent period, such as block springs model, sub-model, continuum Model and discrete element mould
Type is still in the scientific research stage.Sub-model is clear as mechanical meaning, computational efficiency is high, the method for strong applicability increasingly by
Numerous technical staff are received, but the difficult point that the interaction between stick is always studied at present, and this moves landslide
Distance influences very big.
Freeze thawing area landslide safety evaluatio and motion range assessment have important social effect and economic value.If to freezing
Come down in tabetisol safety and motion range understanding it is unclear, will certainly hinder or restrict traffic route in area, common base is set
It applies, the construction and operation of Xincheng District, influences national important development strategical planning, bring beyond measure loss.
Invention content
The purpose of the present invention again with a kind of clear concept is provided, understandable method solves disadvantages mentioned above.Specific skill
Art scheme is as follows：
A kind of landslide safety analysis of frost thawing type and move distance measuring method, including two big computing modules, respectively pacify
Full property computing module and move distance computing module, it is characterised in that further include following step：
Step 1, the basic geological study in space to be predicted, geologic parameter, temperature parameter, River parameter are obtained, come down point
Landslide point location parameter does not occur；
Step 2, rigid block movement model is established, safety coefficient is calculated, determines critical-temperature, temperature is more than critical-temperature, sliding
Slope unstability.Rigid block movement model is will to come down to be reduced to stiff rectangular block, and Successful utilization divides the model in Earthquake-landslide
During analysis calculates, such as Newmark earthquake analysis methods, reference can be made to the such as Wang Tao are based on the regional earthquake for simplifying Newmark displacement models
Landslide hazard rapid evaluation-by taking Wenchuan Ms8.0 grades of earthquake as an example《Engineering geology journal》.2013, volume 21 (the 1st phase).Step
Rapid 2 further include specifically：
2.1) rigid block movement Landslide Model is established；
2.2) safety coefficient of Landslide Model under non-melting state is calculated, specific formula for calculation is as follows：
Fs=Wcos α tan φ/Wsin α=tan φ/tan α
Wherein：
Fs：The safety coefficient of Landslide Model；
W：The weight of Landslide Model；
φ：Internal friction angle；
α：Slope inclination angle；
2.3) the dynamic balance formula of Landslide Model under melting state is calculated, specific formula for calculation is as follows：
Pw+ Wsin α=Wcos α tan φ
Wherein：
Pw：Pore water pressure；
2.4), on computers according to formula：
Mw=a | K |-b
Obtain relationship between water content and temperature.Wherein：
Mw：Water content；
a、b：Empirical related with soil property, the trial curve varied with temperature according to this area's content of unfrozen water in frozen earth
It can get.The frozen soil water content that the frozen soil water content measured by K=-1 DEG C can acquire a, be measured again by the arbitrary subzero temperatures of K=can
Acquire b；
K：Subzero temperature；
2.5) water content and pore water pressure relationship are calculated：
Wherein：
γw：The severe of water；
γ：The severe of gliding mass；
m：The ratio that water accounts for.
Melting state landslide critical-temperature and non-melting state landslide safety coefficient relationship are obtained, is judged by critical-temperature
Whether instability status is in, specific formula for calculation is as follows：
Step 3, wall element and module unit are divided to the landslide of above-mentioned unstability, calculates the speed in the motion process of landslide
Degree and distance.Module unit carries out unit cutting with slices method to landslide, and this method is more mature, such as：Come down static(al)
Swedish slice, Mogensten-Price slices methods in stability analysis etc., the number of unit of cutting is more, and precision is got over
It is also longer to calculate the time certainly for height.Concrete principle can be according to Chen Zuyu《Soil-slope stability analysis:Principle Method journey
Sequence》It obtains.And the wall element proposed, actually more precisely without thickness wall element, being will be mutual between stick
The form of active and passive soil pressure on retaining wall is acted through to understand and calculate, specific Earth Pressure on Retaining Wall principle can be found in Gong
Xiao Nan《Soil mechanics》.Step 3 further includes specifically：
3.1) rigid block movement Landslide Model is divided into wall element and module unit, wherein wall element is no thickness
Unit；
3.2) soil pressure P suffered by wall element is calculated as follows；
Wherein：
Ki：I-th wall element lateral pressure coefficient, fluid take 1.0.It is related to tangential strain increment ε when nonfluid, it refers to
Step 3.8；
Hi：The height of i-th wall element；
With wall and stick cell height, the relevant gradient of displacement.
3.3) friction-type rheology substrate resistance model is selected, frictional resistance T is obtained；
T=γ Hicosα(1-ru)tanφ
Wherein：
ru：Pore pressure parameter；
3.4) resultant force F suffered by wall element is calculated；
F=γ Hisinα+P-T
3.5) wall element speed V is calculated；
Wherein：
Vi、Vi'：I-th wall element is new, old speed；
Δt：Time step；
g：Acceleration of gravity；
3.6) wall, stick element displacement S, s are calculated；
Wherein：
Si、Si'：I-th wall element is new, old displacement；
Si+1：The new displacement of i+1 wall element；
sj：J-th strip module unit displacement.
3.7) height h, H of stick, wall element is calculated；
Wherein：
Dj：J-th strip module unit volume；
hj-1、hj：Jth -1, j-th strip module unit height；
Hi：I-th wall element height；
3.8) wall element, the stiffness K of module unit, k are calculated；
(3.8.1) obtains the tangential strain increment ε of j-th strip module unit firstj, such as following formula：
Wherein：
εj：The tangential strain increment of j-th strip module unit.
(3.8.2), which is calculated, obtains active and passive coefficient of earth pressure kai、kpiSuch as following formula：
Wherein：
δi：I-th wall element bottom friction angle；
kai：I-th wall element coefficient of active earth pressure；
kpi：I-th wall element coefficient of passive earth pressure；
(3.8.3) calculated rigidity coefficient ks
Work as εjWhen >=0, i.e. extended state, ks=40 (kai-kpi)
Work as εj<When 0, i.e. compressive state, ks=20 (kai-kpi)
(3.8.4) calculates stick element stiffness k
kj=kj'+ksεj
Wherein：
kj、kj'：J-th strip module unit is new, old rigidity；
ks：Calculated rigidity coefficient.
(3.8.5) calculates the product between wall, the height of module unit, displacement associated gradients and wall lateral pressure coefficientIt substitutes into and 3.2) calculates soil pressure P suffered by wall element.
Wherein：
kj-1：The new rigidity of -1 module unit of jth.
sj-1：- 1 stick element displacement of jth.
Advantageous effect
A kind of frost thawing type landslide safety analysis of the present invention and move distance measuring method, can be 1:10000 frozen soil are investigated
Fast Evaluation is carried out to the safety that frost thawing type comes down according to temperature change in area's figure amplitude range, evaluation efficiency is better than numerical simulation
Evaluation method 70%.Meanwhile can according to algorithm above to landslide can movable range calculate.
In conclusion the present invention technically has significant progress, and there is apparent good effect, be really a novelty,
Progress, practical technical method.
Above description is only the general introduction of technical solution of the present invention, in order to better understand the technical means of the present invention,
Simultaneously can be implemented in accordance with the contents of the specification, and in order to allow the present invention above and other objects, features and advantages energy
Enough it is clearer and more comprehensible, it is special below to lift preferred embodiment, and coordinate attached drawing, detailed description are as follows.
Description of the drawings
Fig. 1 is the flow diagram of a kind of frost thawing type landslide safety analysis of the present invention and move distance measuring method；
Fig. 2 is the calculation process schematic diagram of frost thawing type landslide safety analysis module in Fig. 1；
Fig. 3 is the calculation process schematic diagram that move distance calculates module in Fig. 1；
Fig. 4 is the non-melting state rigid block movement computation model figure of frost thawing type landslide safety analysis；
Fig. 5 is the rigid block movement computation model figure of melting state of frost thawing type landslide safety analysis；
Fig. 6 is wall, the module unit computation model figure of move distance measuring and calculating analysis；
Fig. 7 is wall in Fig. 6, stick element stiffness calculating schematic diagram；
Fig. 8 is that critical-temperature judges figure in frost thawing type landslide safety analysis in embodiment；
Fig. 9 is that landslide moves schematic diagram in move distance measuring and calculating analysis in embodiment；
Specific implementation mode
To further describe the present invention, with reference to the accompanying drawings and examples to a kind of present invention frost thawing type landslide safety point
Analysis and move distance measuring method are described in further detail.
Step 1：Certain frost thawing type landslide is chosen, the ginsengs such as density, the gradient, internal friction angle, temperature, the water content on landslide are measured
Number.
Step 2：Landslide is reduced to rigid block movement computation model, calculates the safety coefficient of non-melting state rigid slide block
FS, according to formulaCorresponding critical-temperature (negative value) is obtained, wherein a, b is warp related with soil property
Constant is tested, can get according to the trial curve that this area's content of unfrozen water in frozen earth varies with temperature.The jelly measured by K=-1 DEG C
The frozen soil water content that native water content can acquire a, be measured again by the arbitrary subzero temperatures of K=can acquire b.In conjunction with certain western permafrost region temperature
Monitoring curve is shown in Fig. 8, wherein landslide critical-temperature calculating is -1.1 DEG C, then when temperature is higher than -1.1 DEG C, landslide is lost
Surely, i.e., landslide failure after March 23.
Step 3：Landslide is continued to be divided into wall, module unit, calculates soil pressure, bottom frictional resistance suffered by wall element
Power then calculates the suffered resultant force of wall element；Further calculate wall, the speed of module unit, displacement, height, rigidity；And generation
Enter Earth Pressure suffered by the wall element of next time step, iterates to calculate successively.This step is calculated and is realized in software,
Block length 250m in software is divided into 25 sections of module units, i.e. 26 sections of wall elements altogether, from slide downward on 37 ° of slopes,
22 ° of internal friction angle, slider bottom angle of friction are also 22 °, and final sliding state is shown in Fig. 9, coasting distance about 140m.
Content described in this specification embodiment is only enumerating to the way of realization of inventive concept, protection of the invention
Range is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention is also and in art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (1)
1. a kind of move distance measuring method for safety analysis of being come down based on frost thawing type, which is characterized in that include the following steps：
Step 1, the basic geological study in space to be predicted, geologic parameter, temperature parameter, River parameter are obtained, landslide point and not
Landslide point location parameter occurs；
Step 2, rigid block movement model is established, safety coefficient is calculated, determines that critical-temperature, temperature are more than critical-temperature, landslide is lost
Surely；
Step 2 specifically includes：
2.1) rigid block movement Landslide Model is established；
2.2) safety coefficient of Landslide Model under non-melting state is calculated, specific formula for calculation is as follows：
Fs=Wcos α tan φ/Wsin α=tan φ/tan α
Wherein：
Fs：The safety coefficient of Landslide Model；
W：The weight of Landslide Model；
φ：Internal friction angle；
α：Slope inclination angle；
2.3) the dynamic balance formula of Landslide Model under melting state is calculated, specific formula for calculation is as follows：
Pw+ W sin α=W cos α tan φ
Wherein：
Pw：Pore water pressure；
2.4), on computers according to formula：
Mw=a | K |-b
Obtain relationship between water content and temperature；Wherein：
Mw：Water content；
a、b：Empirical related with soil property, the trial curve varied with temperature according to this area's content of unfrozen water in frozen earth obtain
；
K：Subzero temperature；
2.5) water content and pore water pressure relationship are calculated：
Wherein：
Mw：Water content；
γw：The severe of water；
γ：The severe of gliding mass；
m：The ratio that water accounts for；
Melting state landslide critical-temperature and non-melting state landslide safety coefficient relationship are obtained, is judged whether by critical-temperature
In instability status, specific formula for calculation is as follows：
Step 3, wall element and module unit are divided to the landslide of above-mentioned unstability, calculate speed in the motion process of landslide with
Distance；
Step 3 specifically includes：
3.1) rigid block movement Landslide Model is divided into wall element and module unit, wherein wall element is no thickness unit；
3.2) soil pressure P suffered by wall element is calculated as follows；
Wherein：
Ki：I-th wall element lateral pressure coefficient, fluid take 1.0；It is related to tangential strain increment ε when nonfluid, refer to step
3.8；
Hi：The height of i-th wall element；
With wall and stick cell height, the relevant gradient of displacement；
3.3) friction-type rheology substrate resistance model is selected, frictional resistance T is obtained；
T=γ Hi cosα(1-ru)tanφ
Wherein：
ru：Pore pressure parameter；
3.4) resultant force F suffered by wall element is calculated；
F=γ Hi sinα+P-T
3.5) wall element speed V is calculated；
Wherein：
Vi、Vi'：I-th wall element is new, old speed；
Δt：Time step；
g：Acceleration of gravity；
3.6) wall, stick element displacement S, s are calculated；
Wherein：
Si、Si'：I-th wall element is new, old displacement；
Si+1：The new displacement of i+1 wall element；
sj：J-th strip module unit displacement；
3.7) height h, H of stick, wall element is calculated；
Wherein：
Dj：J-th strip module unit volume；
hj-1、hj：Jth -1, j-th strip module unit height；
Hi：I-th wall element height；
3.8) rigidity of wall element, module unit is calculated；
(3.8.1) obtains the tangential strain increment ε of j-th strip module unit firstj, such as following formula：
Wherein：
εj：The tangential strain increment of j-th strip module unit；
(3.8.2), which is calculated, obtains active and passive coefficient of earth pressure kai、kpiSuch as following formula：
Wherein：
δi：I-th wall element bottom friction angle；
kai：I-th wall element coefficient of active earth pressure；
kpi：I-th wall element coefficient of passive earth pressure；
(3.8.3) calculated rigidity coefficient ks
Work as εjWhen >=0, i.e. extended state, ks=40 (kai-kpi)
Work as εj<When 0, i.e. compressive state, ks=20 (kai-kpi)
(3.8.4) calculates stick element stiffness k
kj=kj'+ksεj
Wherein：
kj、kj'：J-th strip module unit is new, old rigidity；
ks：Calculated rigidity coefficient；
(3.8.5) calculates the product between wall, the height of module unit, displacement associated gradients and wall lateral pressure coefficientIt substitutes into and 3.2) calculates soil pressure P suffered by wall element；
Wherein：
kj-1：The new rigidity of -1 module unit of jth；
sj-1：- 1 stick element displacement of jth.
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| CN111445120B (en) * | 2020-03-24 | 2022-04-19 | 成都理工大学 | Landslide movement distance transcendental probability calculation method |
| CN111931369B (en) * | 2020-08-05 | 2024-04-09 | 长安大学 | Rainfall landslide stability analysis and movement distance measurement method, equipment and medium |
| CN112241603B (en) * | 2020-10-28 | 2021-05-14 | 中国地质科学院地质力学研究所 | Numerical simulation method for high-order landslide impact scraping and underlayer converging process |
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