CN106053331B - Excavate roadway surrounding rock strain energy migration quantization method under Unloading Effect - Google Patents
Excavate roadway surrounding rock strain energy migration quantization method under Unloading Effect Download PDFInfo
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Abstract
It opens a mine stress studies the present invention relates to one kind, specially excavate roadway surrounding rock strain energy migration quantization method under Unloading Effect, using numerical simulation means, establish roadway excavation model, simulate the excavation off-load process of Test in Situ, the mechanics of country rock and deformation under Unloading Effect are excavated in monitoring, and excavating roadway surrounding rock strain energy migration quantization scheme under Unloading Effect for structure provides data basis.Roadway surrounding rock strain energy migration quantization method under excavation Unloading Effect provided by the invention, successively undergone based on energy migration velocity " fast → slowly → fast " process, it proposes prevention and administers the effective measures of roadway surrounding rock unstability.Energy migration can be blocked in " slow " stage, take certain measure repeatedly to discharge the energy assembled within the scope of this, can effectively solve the aggregation of wall rock destabilization area energy, reduce the generation of disaster, ensure that engineering is smoothed out.
Description
Technical field
It opens a mine stress studies the present invention relates to one kind, specially excavates roadway surrounding rock strain energy migration quantization under Unloading Effect
Method.
Background technology
It exploits to deep and develops with Mineral Resources in China, it is all disaster-ridden that more and more underground engineerings are faced with rock burst etc.
Evil.In underground engineering, the excavation in tunnel makes complete rock mass free face occur, has broken original ambient stress,
During the adjustment of stress, energy is also shifted, and the basic reason of roadway surrounding rock unstability is the release institute of elastic strain energy
Cause.
Under condition of high ground stress during Underground Engineering Excavation tunnel, the excavation of rock mass can make stress quick release, generate
Strong dynamic effect causes wall rock loosening, ambient stress to be readjusted, if adjustment failure, roadway surrounding rock will generate different
The damage of degree destroys, or even the disasters such as rock burst occur.
The relationship for considering energy and ess-strain, by excavating entire Stress relief stage strain after off-load, stress
Quantization, the quantitative migration rule that research accumulation strain can be during Stress relief can be to prevent and administer mine and other water
The underground passage unstability disaster of sharp hydroelectric project provides Research foundation.
At present for the research in terms of surrounding rock stability under roadway excavation Unloading Effect, it is concentrated mainly on qualitative discussion.
Only qualitatively consider aggregation, dissipation and the release of energy to roadway deformation caused by Rock Mass Unloading, damage and destruction etc.,
The digging process for having ignored rock mass gathers to strain energy product and the quantitative research of release.
Invention content
In view of the above technical problems, roadway surrounding rock strain energy migration quantization side under a kind of excavation Unloading Effect of present invention offer
Method considers the relationship of energy and ess-strain, by the monitoring to excavating entire Stress relief stage strain and stress after off-load,
Migration rule of energy during Stress relief is studied, it is final for prevention and improvement mine and the ground of other hydraulic and hydroelectric engineerings
Lower tunnel unstability disaster provides Research foundation, ensures that engineering is smoothed out.
Specifically technical solution is：
Roadway surrounding rock strain energy migration quantization method under Unloading Effect is excavated to establish tunnel using numerical simulation means and open
Model is dug, the excavation off-load process of Test in Situ is simulated, monitoring is excavated the mechanics of country rock and deformation under Unloading Effect, opened for structure
It digs roadway surrounding rock strain energy migration quantization scheme under Unloading Effect and data basis is provided.
1. roadway excavation model construction
The ratio between experimental model size and heading sizes have to be larger than 3:1.Control mode is Biaxial stress, wherein horizontal and axis
To definite value must be loaded onto, to simulate the excavation operation for carrying out tunnel under certain ground stress environment.This main analog one
The lanes Ci Cheng, by taking round section configuration as an example.According at this stage, metal mine is in the majority with hard brittle rock, in the mechanics parameter of material
In assignment, mainly based on hard brittle rock.
2. experimental procedure
(1) the three-dimensional rock mass of certain size is built.
(2) it is further applied load the model of importing to definite value, the ground stress environment at model engineering scene.
(3) after the completion of ground stress environment assignment, ensure that rock mass is in stable state.
(4) off-load process is excavated, excavation operation is carried out in the center of model front-back, further according to engineering site rock mass
It excavates, can be divided into primary excavation or excavates stage by stage.
(5) after the completion of excavating, continue to keep Roadway model stress state.
(6) mechanics of observation country rock and the three-dimensional cloud atlas of deformation, the concentrated area of identified sign and strain, and further catch
Catch the quantitative transport conditions of accumulation strain energy.
3. tunnel mechanical analysis after roadway excavation
A. principal stress and principal strain analysis
After numerical simulation, the principal stress and principal strain three-dimensional cloud atlas of Roadway model are drawn, principal stress is found and master answers
Become concentrated area, delineation selective analysis region.
B. deviatoric stress and inclined strain analysis
Unstable failure, which occurs, for rock is mainly caused by deviatoric stress, and the unstability of roadway surrounding rock is also such.To principal stress and master
Straining concentration zone domain carries out deviatoric stress and inclined strain analysis, if deviatoric stress is positive value, explanation is compression concentration zones, otherwise to draw
Area of stress concentration.If strain is positive value partially, illustrate that concentrated area produces the shearing changing of the relative positions and destroys.If strain is negative value, explanation partially
Concentrated area is mainly pulling damage.
4. the quantitative research of accumulation strain energy migration rule
According to the relational expression of energy and stress, strain, following relational expression can be used and carry out strain energy solution：
According to the formula, the data of each monitoring point of each moment in Stress relief stage are handled, energy value is obtained
U*, and it is translated into three-dimensional cloud atlas.By the three-dimensional cloud atlas of observation, the evolutionary process of accumulation strain energy can be quantified, it also can be total
The stage that knot and summary accumulation strain can migrate.
According to the ess-strain numerical value of each cell cube at each moment, corresponding energy values are solved, accumulation is answered
The maximum value for becoming energy concentrated area indicates concentrated area, then is translated into three-dimensional cloud atlas, the quantization rule migrated.
Roadway surrounding rock strain energy migration quantization method, is based on energy migration velocity under excavation Unloading Effect provided by the invention
Successively experience " fast → slow → fast " process, proposes the effective measures for preventing and administering roadway surrounding rock unstability.It can be in " slow " stage
Energy migration is blocked, takes certain measure repeatedly to discharge the energy assembled within the scope of this, can effectively solve
The aggregation of wall rock destabilization area energy, reduces the generation of disaster, ensures that engineering is smoothed out.
Description of the drawings
Test model before Fig. 1 a are excavated；
Test model after Fig. 1 b are excavated；
Fig. 2 a roadway excavation principal strains ε strains cloud atlas；
Fig. 2 b roadway excavation principal stresses σ 1 strains cloud atlas；
Fig. 3 a roadway excavations strain partially strain γ s partially and deviatoric stress cloud atlas；
Fig. 3 b roadway excavations strain deviatoric stress q and deviatoric stress cloud atlas partially；
Energy cloud atlas on the right side of the tunnels Fig. 4 a；
Energy maximum value curve graph on the right side of the tunnels Fig. 4 b.
Specific implementation mode
The specific implementation mode of the present invention is described with reference to the drawings.
1. roadway excavation model construction
Experiment sample dimensions are 150 × 150 × 150mm3, the intermediate a diameter of 45mm in simulation tunnel.Control mode is double
Axis loads, and wherein horizontal direction is further applied load as 9MPa, and vertical direction is further applied load as 45MPa.The material parameter source of model
In laboratory, design parameter is shown in Table 1.
1 material parameter of table
Excavate front and back numerical model as illustrated in figs. 1A and ib.
2. experimental procedure
It is further applied load the model of importing to definite value, horizontal direction 9MPa, 45MPa, carries out plastic analysis, simulation underground is answered
Power state excavates the tunnel set after ambient stress stabilization, simulates simultaneous drifting in Practical Project, is carried out again to it
Plastic analysis is completed or is generated to calculate and not restrain until plastic analysis,
3. tunnel mechanical analysis after roadway excavation
A. principal stress and principal strain analysis
After analog result shows roadway excavation, stress and strain concentrated area is mainly in the left and right sides and top in tunnel
Bottom, Fig. 2 a are 1 cloud charts of principal strain ε after roadway excavation, and Fig. 2 b are 1 cloud charts of principal stress σ after roadway excavation.
Stress and strain generates apparent compression shear destructive characteristics in left and right sides X-direction.Ess-strain is mainly with " onion
Shape " expands outwardly layer by layer in a certain range, and ess-strain value is negative value, illustrates compression chord at left and right sides of tunnel.This
Outside, Stress-strain concentration region of variation is mainly in a certain range of tunnel both sides.
B. deviatoric stress and inclined strain analysis
Fig. 3 a are that roadway excavation retrodeviates strain γ s cloud charts, and Fig. 3 b are deviatoric stress q cloud charts after roadway excavation.
In inclined strain figure, tunnel top/bottom part generates a smaller triangular shape straining concentration zone domain, but in deviatoric stress cloud atlas, tunnel
The stress value of top/bottom part is 0, and without stress concentration, which shows that tensioning crackle discharges the stress and energy of concentration.Strain
Generation be that would not also generate new destruction since caused by pulling damage, tunnel top/bottom part does not have area of stress concentration, thus
The tensioning crackle that top/bottom part in tunnel generates does not interfere with other destructions.
4. the quantitative research of accumulation strain energy migration rule
Symmetrical according to simulated experiment result phenomenon, the data of extraction tunnel right hand sight continue to study.According to this
The data of each monitoring point of each moment in Stress relief stage are handled, obtain energy value U*, and converted by formula
For three-dimensional cloud atlas, such as Fig. 4 a.
By cloud atlas it is not difficult to find that equally there is stage, migration process successively experienced fast transfer → product for energy migration
Tired transition → rapidly discharge three processes, by further extracting the Energy maximum value of each step of adjustment process, and according to two dimension
Spatial coordinate location, the variation track of determining maximum, as shown in Figure 4 b, stage have apparent " fast → slow → fast " variation
Feature.
During the dynamic offloading of initial field stress, it can be seen from Fig. 4 a before the Stress relief stage in 2 steps, with
Side wall distance is about that country rock energy is relatively low in range at the 89% of the tunnel (20mm) radius, this is because energy is done with radial stress
The mode of work(is quickly discharged to free face, and it is larger to be more than energy value at tunnel radius 169% with side wall distance.
Due to rock spring-back effect, depths country rock starts to turn the rock by proximal wall by way of radial stress acting
It is moved from the strain energy of body, energy accumulation transition path is shown in Fig. 4 a and table 2.
Before 2 energy jump of table at a distance from right side wall
During phase III energy rapidly discharges, it is not difficult to find out since the 20th step by cloud atlas, deep-red coloration
It is about in 133% range of tunnel radius that region, which is concentrated mainly on side wall distance, it is seen that discharges stage, circular tunnel in energy
At stringcourse apart from side wall be the 133% of tunnel radius in the range of be area of energy concentration domain and the easy instability area of country rock, and scheme
4b can be seen that maximum energy value from 23 steps to 24 steps by being rapidly transferred to side with side wall distance for the 133% of tunnel radius
At wall, rapidly transfer of the energy to free face implies wall rock destabilization.
Claims (1)
1. excavating roadway surrounding rock strain energy migration quantization method under Unloading Effect, it is characterised in that：Using numerical simulation means, build
Vertical roadway excavation model simulates the excavation off-load process of Test in Situ, and the mechanics of country rock and deformation under Unloading Effect are excavated in monitoring,
Roadway surrounding rock strain energy migration quantization scheme under Unloading Effect is excavated for structure, and data basis, including following procedure are provided：
1. roadway excavation model construction
The ratio between experimental model size and heading sizes are more than 3:1, control mode is Biaxial stress, wherein it is horizontal and it is axially loaded extremely
Definite value, to simulate the excavation operation for carrying out tunnel under certain ground stress environment；
2. experimental procedure
(1) the three-dimensional rock mass of certain size is built；
(2) it is further applied load the model of importing to definite value, the ground stress environment at model engineering scene；
(3) after the completion of ground stress environment assignment, ensure that rock mass is in stable state；
(4) off-load process is excavated, excavation operation is carried out in the center of model front-back, is opened further according to engineering site rock mass
It digs, be divided into primary excavation or excavate stage by stage；
(5) after the completion of excavating, continue to keep Roadway model stress state；
(6) mechanics of observation country rock and the three-dimensional cloud atlas of deformation, the concentrated area of identified sign and strain, and further capture tired
The quantitative transport conditions of product strain energy；
3. tunnel mechanical analysis after roadway excavation
A. principal stress and principal strain analysis
After numerical simulation, the principal stress and principal strain three-dimensional cloud atlas of Roadway model are drawn, finds principal stress and principal strain collection
Middle region, delineation selective analysis region；
B. deviatoric stress and inclined strain analysis
Deviatoric stress and inclined strain analysis are carried out to principal stress and principal strain concentrated area, if deviatoric stress is positive value, explanation is that pressure is answered
Power concentration zones, on the contrary it is tensile stress concentration zones；If strain is positive value partially, illustrate that concentrated area produces the shearing changing of the relative positions and destroys；If
Strain is negative value partially, illustrates that concentrated area is mainly pulling damage；
4. the quantitative research of accumulation strain energy migration rule
According to the relational expression of energy and stress, strain, strain energy solution is carried out using following relational expression：
According to the formula, the data of each monitoring point of each moment in Stress relief stage are handled, obtain energy value U*, and
And it is translated into three-dimensional cloud atlas；By observing three-dimensional cloud atlas, can quantify accumulation strain can evolutionary process, can also summarize and generally
Include the stage that accumulation strain can migrate；
According to the ess-strain numerical value of each cell cube at each moment, corresponding energy values are solved, by accumulation strain energy
The maximum value of concentrated area indicates concentrated area, then is translated into three-dimensional cloud atlas, the quantization rule migrated.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109269907B (en) * | 2018-11-09 | 2020-11-06 | 中南大学 | Rock mass internal excavation unloading simulation experiment device and application method thereof |
| CN113203625B (en) * | 2021-04-15 | 2022-06-17 | 中国科学院地质与地球物理研究所 | Modeling method and device for simulating jointed rock roadway excavation test |
| CN113392561B (en) * | 2021-06-29 | 2024-02-23 | 淮南矿业(集团)有限责任公司 | Method and device for realizing energy field analysis of surrounding rock around roadway |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738331A (en) * | 2009-12-28 | 2010-06-16 | 北京交通大学 | Tunnel construction simulation plane strain model test device |
| CN103616287A (en) * | 2013-11-28 | 2014-03-05 | 湖南大学 | Laboratory model testing device for tunnel excavation |
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2016
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738331A (en) * | 2009-12-28 | 2010-06-16 | 北京交通大学 | Tunnel construction simulation plane strain model test device |
| CN103616287A (en) * | 2013-11-28 | 2014-03-05 | 湖南大学 | Laboratory model testing device for tunnel excavation |
Non-Patent Citations (4)
| Title |
|---|
| 《Assessment of tunnel instability—a numerical approach》;Amit K. Verma et al.;《Arab J Geosci》;20090801;第181-192页 * |
| 《Mont Terri 试验场Mine-by 巷道开挖近场响应模拟分析》;李连崇 等.;《岩石力学与工程学报》;20140831;第33卷(第8期);第1626-1634页 * |
| 《Structural control of wind turbines with soil structure interaction included》;Breiffni Fitzgerald et al.;《Engineering Structures》;20160106;第131-151页 * |
| 《基于多物理场参数变化的花岗岩巷道岩爆前兆模拟实验研究》;张艳博 等.;《岩石力学与工程学报》;20140731;第33卷(第7期);第1347-1357页 * |
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