CN105160093A - Method for analyzing change of force applied to fractured rock slope along depth under heavy seismic load - Google Patents
Method for analyzing change of force applied to fractured rock slope along depth under heavy seismic load Download PDFInfo
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- CN105160093A CN105160093A CN201510539710.6A CN201510539710A CN105160093A CN 105160093 A CN105160093 A CN 105160093A CN 201510539710 A CN201510539710 A CN 201510539710A CN 105160093 A CN105160093 A CN 105160093A
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Abstract
The invention provides a method for analyzing change of force applied to a fractured rock slope along depth under a heavy seismic load. The method comprises: a. establishing a fractured-rock-slope equivalent model, and presetting cracks of different angles in the fractured-rock-slope equivalent model; b. inputting simulated seismic waves into the fractured-rock-slope equivalent model; c. according to a force application result of the fractured-rock-slope equivalent model after the simulated seismic waves are input, acquiring an effect of the cracks on an slope internal force under a seismic load. The invention discloses, from a micro perspective, a mechanism in which a rock slope deforms and breaks under a dynamic load, and proposes a new dynamic rock breaking strength criterion based on fracture mechanics, to help propose a reasonable and economical protecting and retaining system, so as to reduce an impact of a broken slope on a surrounding environment in a disaster. According to an analysis method provided by the invention, a standard slope design method is established, and a perfect research foundation and basis are laid for applications in projects such as landslide control, high and steep slope protection, and so on.
Description
Technical field
The present invention relates to slope project field, under particularly relating to a kind of strong earthquakes load, contain the force analysis method of fractured rock slope along change in depth.
Background technology
China is many earthquakes country, repeatedly violent earthquake occurs in recent years, as Tangshan Earthquake, Wenchuan violent earthquake etc.According to earthquake number of times and the seismic intensity analysis of nearly decades, the earthquake that China occurs has the trend of increase, and has focus shallow, and intensity is large, and the feature that frequency is high, mainly concentrates on central and west regions.Simultaneously China again man of Shi Yigeduo mountain country, particularly southwest have a large amount of natural slopes, due to the enforcement of strategy to develop western regions, built a large amount of infrastructure, highway, railway, building construction, bridge etc.Carry out engineering construction in mountain area, because topography and geomorphology is more complicated, various types of rock side slope engineering is very common.Rock is one of the most complicated solid material of nature, in very long earth history process, experienced by repeatedly effect and the transformation of geologic structure stress, complete rock mass is originally made to become the geologic body damaged in various degree, thus create the structural plane such as joint, crack coming in every shape, differ in size, even tomography.In recent years, along with the not section of Geotechnical Engineering scale expands, engineering problem is on the increase, owing to containing various defect in rock mass, comprise macroscopical discontinuous faces such as micro-crack, hole and joint fissure, in the stability of rock side slope and rock mass crack interaction and through characteristic closely bound up.Rock fracture mechanics gives growth criterion and the propagation direction of special single crackle or regularity distribution crackle in homogeneous material, but often not as people's will in the theoretical research of complicated multiple cracks rock.In sum, containing fractured rock slope under seismic loading, its force-mechanism is quite complicated, at present, the comparative maturity having much for side slope static stability analysis theories and developed both at home and abroad, and dynamic stability of slope analysis is also perfect not in developing stage.Simultaneously, for in the researching and analysing of Stability of Slope In Rock, only consider the impact that there is Upon Slope Stability of rock fracture, or only consider that geological process is on the impact of Stability of Slope In Rock, seldom have research to act on for crack and earthquake load simultaneously simultaneously and the impact of the stability of rock side slope is analyzed and researched.Meanwhile, in design parameter optimization, current achievement in research is all that the canonical parameter obtained has specific region property for a certain concrete engineering usually, representative not enough.And be substantially all study for Single-issue at present, seldom have the impact considering multiple factors Upon Slope Stability, be not enough to the Sufficient Criteria as stability of slope.
Summary of the invention
In view of this, the force analysis method of fractured rock slope along change in depth is contained under the invention provides a kind of strong earthquakes load, to solve the problem.
Contain fractured rock slope under strong earthquakes load provided by the invention along the force analysis method of change in depth, comprise
A. set up containing fractured rock slope scale model, and at the described crackle containing the preset different angles of fractured rock slope scale model;
B. seismic wave is in analog inputted to described containing fractured rock slope scale model;
C. according to inputting the stressed result containing fractured rock slope scale model after seismic wave in analog, determine that crack is on the impact of slope body internal force under earthquake load.
Further, step c also comprises
C1. the evolutionary process of scale model crackle under dynamic loading is repeatedly obtained.
3, contain fractured rock slope under strong earthquakes load according to claim 2 along the force analysis method of change in depth, it is characterized in that: also comprise after step c1
C2. according to the evolutionary process of crackle under different load situation, the evolution mechanism of scale model crackle under dynamic loading is repeatedly determined.
Further, obtain the relation between brittle failure section length and load according near crack line analysis, determine the evolution mechanism of Crack Extension.
Further, the deterministic process of the evolution mechanism of described Crack Extension comprises:
S1. analyze containing fractured rock slope scale model crack rock Damage and Fracture process under dynamic loading repeatedly,
S2. obtain the energy dissipation mechanism of crack rock damage evolution law and damage development process, show that crackle is interrupted stress field energy field,
S3. determine that opening of crackle splits propagation direction,
S4. obtain containing fractured rock slope scale model evolutionary process to crackle under different load situation.
Further, according to the evolution mechanism of Crack Extension, set up fracture computation model, described fracture settlement model is crack propagation and the mechanical model be connected under dynamic loading repeatedly.
Further, by the computation model that ruptures described in mesh free particle method calculating simulation.
Further, described fracture computation model is applied to typical slope body structure, obtain complicated crack to the stressing influence of slope body internal force under earthquake load.
Further, set up the seepage-pipe coupling model model containing fractured rock slope, by the described seepage-pipe coupling model model containing fractured rock slope, carry out the force analysis of crevice water to fractured rock slope.
Further, the described seepage-pipe coupling model model containing fractured rock slope stays field to utilize discrete networks model to set up according to containing oozing of Fractured Rock Slope.
Beneficial effect of the present invention: the present invention is according to containing the destructive process of fractured rock slope under action of strong earthquake, the mechanism of rock side slope deformation failure under dynamic loading is disclosed from the angle of microcosmic, a kind of dynamic rock failure mechanism of rock criterion of strength based on fracturing mechanics is newly proposed, clearly containing fractured rock slope stress-strain state in seismic wave propagation process, the impact flown slope body periphery of block after can solving slope failure targetedly, and improve containing the stability of fractured rock slope under strong earthquakes load, rationally economic protection supporter system is proposed, after reducing calamity, damaged slope body affects surrounding enviroment.Standardization Slope Design method can be set up, for its promoting the use in the engineering such as landslide control, high-steep slope protection establishes perfect Research foundation and foundation by analytical approach of the present invention.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is principle schematic of the present invention.
Fig. 2 is schematic flow sheet of the present invention.
Fig. 3 is gridless routing computation model schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described: Fig. 1 is principle schematic of the present invention, and Fig. 2 is schematic flow sheet of the present invention.
As shown in Figure 1, 2, contain fractured rock slope under the strong earthquakes load in the present invention along the force analysis method of change in depth, comprise
A. set up containing fractured rock slope scale model, and at the described crackle containing the preset different angles of fractured rock slope scale model;
B. seismic wave is in analog inputted to described containing fractured rock slope scale model;
C. according to inputting the stressed result containing fractured rock slope scale model after seismic wave in analog, determine that crack is on the impact of slope body internal force under earthquake load.
The present invention adopts analog material to make scale model, and the crackle of prefabricated different angles, by inputting seismic wave in analog to described containing fractured rock slope scale model, observe the evolutionary process of scale model crackle under xial feed and tangential loading effect, derive crackle and be interrupted stress field energy field, determine that opening of crackle splits propagation direction, obtain the evolutionary process to crackle under different load situation, the evolution mechanism of crackle under clear and definite dynamic loading repeatedly, on this basis, from the microcosmic angle of the rock failure mechanism of rock, the concept of fracturing mechanics is incorporated in Rock Strength Theory research, propose one new under dynamic loading repeatedly containing the criterion of strength of crack rock.
In the present embodiment, according to scale model research crack rock deformation fracture process and energy dissipation mechanism thereof under course under cyclic loading, action of strong earthquake is reduced to sine wave, analyzes repeatedly crack rock Damage and Fracture process under dynamic loading with this.Select cement gypsum as the analog material of model according to similarity relation theory in the present embodiment, do aggregate with silica sand.
In the present embodiment, step c also comprises
C1. the evolutionary process of scale model crackle under dynamic loading is repeatedly obtained.
C2. according to the evolutionary process of crackle under different load situation, the evolution mechanism of scale model crackle under dynamic loading is repeatedly determined.
In the present embodiment, obtain the relation between brittle failure section length and load according near crack line analysis, determine the evolution mechanism of Crack Extension.Wherein, the deterministic process of the evolution mechanism of Crack Extension comprises:
S1. analyze containing fractured rock slope scale model crack rock Damage and Fracture process under dynamic loading repeatedly,
S2. obtain the energy dissipation mechanism of crack rock damage evolution law and damage development process, show that crackle is interrupted stress field energy field,
S3. determine that opening of crackle splits propagation direction,
S4. obtain containing fractured rock slope scale model evolutionary process to crackle under different load situation.
In the present embodiment, utilize near crack line analysis, the accurate elastic region stress field of crack tip and brittle failure district stress field under research action of compressive stress, then match accurate elastic region stress field and brittle failure district stress field, and then determine the relation between brittle failure section length and load.Utilize the relation between brittle failure section length and load, analyze the through mechanism that crackle produces cleavage fracture theoretically, thus determine the evolution mechanism of crackle Crack Extension, set up fracture computation model.Described fracture settlement model is crack propagation and the mechanical model be connected under dynamic loading repeatedly.This mechanical model is on the basis of crack rock dynamic test, according to crack rock dynamic failure process, crack rock mechanical characteristic is angularly expressed from crack rock structure effect and energy dissipation, use the programming tools such as Fortran and MATLAB to work out corresponding gridless routing program of numerical calculation to simulate, its computation model as shown in Figure 3.
In the present embodiment, also consider to have split the impact of gap water on fractured rock slope, discrete networks analysis is adopted to stay field containing oozing of Fractured Rock Slope, set up a seepage-pipe coupling model model containing fractured rock slope, under action of strong earthquake, in comprehensive analysis crevice water situation, split the force modes of rock side slope.The result making force analysis is more accurate, then according to Cracks Evolution mechanism under dynamic loading repeatedly, fracture computation model is applied to typical slope body structure, thus determine that complicated crack is to slope body internal force influencing each other under earthquake load.
The present invention by rock side slope non-mesh method is calculated to carry out containing fractured rock slope simulation also and layer during similar model test contrast, determine containing the destruction damage field of fractured rock slope under action of strong earthquake, according to the volume of avalanche sillar and residing position and the form of highly determining corresponding retaining structure may occur, set up standardization Slope Design method targetedly, and be the research containing fractured rock slope Anti-sliding stopping structure and innovation based theoretical.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. contain fractured rock slope under strong earthquakes load along a force analysis method for change in depth, it is characterized in that: comprise
A. set up containing fractured rock slope scale model, and at the described crackle containing the preset different angles of fractured rock slope scale model;
B. seismic wave is in analog inputted to described containing fractured rock slope scale model;
C. according to inputting the stressed result containing fractured rock slope scale model after seismic wave in analog, determine that crack is on the impact of slope body internal force under earthquake load.
2. contain fractured rock slope under strong earthquakes load according to claim 1 along the force analysis method of change in depth, it is characterized in that: step c also comprises
C1. the evolutionary process of scale model crackle under dynamic loading is repeatedly obtained.
3. contain fractured rock slope under strong earthquakes load according to claim 2 along the force analysis method of change in depth, it is characterized in that: also comprise after step c1
C2. according to the evolutionary process of crackle under different load situation, the evolution mechanism of scale model crackle under dynamic loading is repeatedly determined.
4. contain fractured rock slope under strong earthquakes load according to claim 3 along the force analysis method of change in depth, it is characterized in that: obtain the relation between brittle failure section length and load according near crack line analysis, determine the evolution mechanism of Crack Extension.
5. contain fractured rock slope under strong earthquakes load according to claim 4 along the force analysis method of change in depth, it is characterized in that: the deterministic process of the evolution mechanism of described Crack Extension comprises:
S1. analyze containing fractured rock slope scale model crack rock Damage and Fracture process under dynamic loading repeatedly,
S2. obtain the energy dissipation mechanism of crack rock damage evolution law and damage development process, show that crackle is interrupted stress field energy field,
S3. determine that opening of crackle splits propagation direction,
S4. obtain containing fractured rock slope scale model evolutionary process to crackle under different load situation.
6. contain the force analysis method of fractured rock slope along change in depth under strong earthquakes load according to claim 5, it is characterized in that: according to the evolution mechanism of Crack Extension, set up fracture computation model, described fracture settlement model is crack propagation and the mechanical model be connected under dynamic loading repeatedly.
7. contain fractured rock slope under strong earthquakes load according to claim 6 along the force analysis method of change in depth, it is characterized in that: by the computation model that ruptures described in mesh free particle method calculating simulation.
8. contain the force analysis method of fractured rock slope along change in depth under strong earthquakes load according to claim 7, it is characterized in that: described fracture computation model is applied to typical slope body structure, obtain complicated crack to the stressing influence of slope body internal force under earthquake load.
9. containing the force analysis method of fractured rock slope along change in depth under the strong earthquakes load according to the arbitrary claim of claim 1-8, it is characterized in that: set up the seepage-pipe coupling model model containing fractured rock slope, by the described seepage-pipe coupling model model containing fractured rock slope, carry out the force analysis of crevice water to fractured rock slope.
10. contain fractured rock slope under strong earthquakes load according to claim 9 along the force analysis method of change in depth, it is characterized in that: the described seepage-pipe coupling model model containing fractured rock slope stays field to utilize discrete networks model to set up according to containing oozing of Fractured Rock Slope.
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| CN109472067A (en) * | 2018-10-24 | 2019-03-15 | 交通运输部公路科学研究所 | A kind of determination method for toppling over type avalanche |
| CN111651901A (en) * | 2020-06-29 | 2020-09-11 | 中国有色金属工业昆明勘察设计研究院有限公司 | Time course analysis method for Xigeda stratum rock slope dynamic stability |
| CN114297864A (en) * | 2021-12-31 | 2022-04-08 | 中国电建集团贵阳勘测设计研究院有限公司 | Cracked loose rock mass slope stability analysis method controlled by steep and gentle dip angles |
| CN115935702A (en) * | 2023-01-04 | 2023-04-07 | 东北石油大学 | Method for determining action direction of tectonic stress field based on PFC (Power factor correction) numerical simulation technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109214054A (en) * | 2018-08-06 | 2019-01-15 | 重庆交通大学 | Dynamic stability of slope analysis method based on displacement |
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| CN109472067A (en) * | 2018-10-24 | 2019-03-15 | 交通运输部公路科学研究所 | A kind of determination method for toppling over type avalanche |
| CN111651901A (en) * | 2020-06-29 | 2020-09-11 | 中国有色金属工业昆明勘察设计研究院有限公司 | Time course analysis method for Xigeda stratum rock slope dynamic stability |
| CN111651901B (en) * | 2020-06-29 | 2023-03-07 | 中国有色金属工业昆明勘察设计研究院有限公司 | Time course analysis method for Xigeda stratum rock slope dynamic stability |
| CN114297864A (en) * | 2021-12-31 | 2022-04-08 | 中国电建集团贵阳勘测设计研究院有限公司 | Cracked loose rock mass slope stability analysis method controlled by steep and gentle dip angles |
| CN114297864B (en) * | 2021-12-31 | 2023-01-24 | 中国电建集团贵阳勘测设计研究院有限公司 | Cracked loose rock mass slope stability analysis method controlled by steep and gentle dip angles |
| CN115935702A (en) * | 2023-01-04 | 2023-04-07 | 东北石油大学 | Method for determining action direction of tectonic stress field based on PFC (Power factor correction) numerical simulation technology |
| CN115935702B (en) * | 2023-01-04 | 2023-06-23 | 东北石油大学 | Method for determining action direction of structural stress field based on PFC (Power factor correction) numerical simulation technology |
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Application publication date: 20151216 |