CN105021444A - Steady rheology rate cross point-based determination method of rock long-time strength parameters - Google Patents
Steady rheology rate cross point-based determination method of rock long-time strength parameters Download PDFInfo
- Publication number
- CN105021444A CN105021444A CN201510369199.XA CN201510369199A CN105021444A CN 105021444 A CN105021444 A CN 105021444A CN 201510369199 A CN201510369199 A CN 201510369199A CN 105021444 A CN105021444 A CN 105021444A
- Authority
- CN
- China
- Prior art keywords
- rock
- steady state
- rheological
- variable rate
- state flow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a steady rheology rate cross point-based determination method of rock long-time strength parameters. The steady rheology rate cross point-based determination method comprises following steps: rock core samples are processed to be standard cylindrical samples; the standard cylindrical samples are subjected to triaxial rheological mechanical property test; two steady rheology rate curves are obtained via fitting based on axial rheological rate and volume rheological rate of steady rheology period; and quantitative determine of rock long-time strength parameters is realized based on the cross points of the axial rheological rate curve and the volume rheological rate curve. According to the steady rheology rate cross point-based determination method, the axial rheological rate curve and the volume rheological rate curve obtained via rock rheological mechanical property test result calculation are compared; rock long-time strength parameters are determined based on critical values of rock compression deformation and volume expansion, wherein the critical values are represented by the cross points of the two steady rheology rate curves; a problem that inflection points are not clear in rock samples with unobvious rheological behaviors in conventional stress-strain isochronous curve cluster method and steady rheology rate method is solved; and the steady rheology rate cross point-based determination method possesses reference value in accurate evaluation of rock long-time stability.
Description
Technical field
The present invention relates to rock mechanics and engineering field, be specifically related to a kind of Long-time strength of rock parameter determination method.
Background technology
The determination of long-term strength is the importance of rock engineering long-time stability and safety analysis, has very important engineering background and meaning.According to different engineering requirements, the understanding for the long-term strength of rock also has bigger difference.A kind of Long-time strength of rock definition of comparing now accreditation be rock under the external load effect of long term constant, there is rheological phenomena; When external load is more than or equal to certain certain value, the Rheological Deformation of rock can continue become greatly and finally destroy; When external load is less than certain certain value, the Rheological Deformation speed of rock can diminish gradually in passing in time, and Rheological Deformation also slowly can be tending towards convergence, and rock can not break; The critical value of this stress level just can be called the long-term strength of rock.In theory, long-term strength is particular value, but carries out theory deduction according to Existing methods and also accurately determine comparatively difficulty by test findings to it, and a conventional interval or approximate value are weighed.
The rheology attribute testing of rock is one of Main Means determining Long-time strength of rock.The research of long-term strength mainly concentrates on the stress state of rock in Mineral rheology dynamic characteristic test, under Simple stress condition, direct method, initial creep method, dilatation method etc. can be utilized directly to determine; And under complex stress condition, mainly according to rheological test result, adopt stress-strain tautochrone bunch method and steady state flow variable Rate bathmometry to determine, stress-strain tautochrone bunch method and steady state flow variable Rate bathmometry are all determined the long-term strength parameter of rock by the flex point of curve straight-line segment and segment of curve.Here knee point refers to when rock rheological characteristics is comparatively remarkable, the catastrophe point of stress-strain tautochrone bunch method and steady state flow variable Rate bathmometry curve or turning point.The bathmometry extensively adopted at present is that any of getting arbitrarily in axis, hoop or volume flow variable Rate curve carries out catastrophe point range estimation, therefore comparatively arbitrarily inaccurate.In addition, the turning point of the straight-line segment of curve initial and the segment of curve in later stage is comparatively obvious, if but rock rheological characteristics is not obvious time, knee point is comparatively fuzzy, is difficult to directly range estimation and obtains, poor effect.
Summary of the invention
Goal of the invention: the object of the invention is to for the deficiencies in the prior art, a kind of Long-time strength of rock determination method for parameter based on steady state flow variable Rate intersection point is provided, is determined the long-term strength parameter of rock by the intersection point of the axial steady state flow variable Rate curve of rock and volume steady state flow variable Rate curve quantitatively.
Technical scheme: the invention provides a kind of Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point, coring sample is processed into standard cylindrical sample, triaxial rheology dynamic characteristic test is carried out to standard cylindrical sample, the axial rheological rate and the volume flow variable Rate that are become the stage by steady state flow simulate two steady state flow variable Rate curves, utilize the intersection point of axis and volume flow variable Rate curve to determine the long-term strength parameter of rock quantitatively.
Under rock is in low-stress state, axial steady state flow variable Rate specific volume steady state flow variable Rate wants large, and rock is in compression deformation state; Under rock is in higher stress state, volume steady state flow variable Rate sharply increases, and exceedes axial steady state flow variable Rate, the rock failure mechanism of rock can occur in the short period, and it is main that rock deformation is converted into volume dilatation by compression deformation.Therefore axis and volume steady state flow variable Rate change curve exist an intersection point, before stress is in this intersection point, rock does not produce obvious ductile fracture; Stress exceedes this intersection point, and rock shows obvious volume dilatation, and dilatation destruction occurs very soon, so intersection point is the critical value of rock compressed distortion and volume dilatation, corresponding deviatoric stress value is the long-term strength parameter value of this granite gneiss.
Further, described core requires intact, nothing breakage, adds and does not destroy rock sample original inner structure man-hour.
Further, the confined pressure of described triaxial rheology dynamic characteristic test gets rock stress value suffered in Practical Project, take the method for hierarchical loading: before Mineral rheology dynamic characteristic test, first carry out the instantaneous dynamic characteristic test of three axles to batch sample, obtain instantaneous peak value intensity, the original upload level of rheological test gets 55% ~ 65% of transient assays peak strength, every grade loads 3% ~ 5% of instantaneous peak value intensity subsequently, round numerical value, every grade of loading is no less than 50 hours, until rock sample generation rheodestruction.
The essential characteristic of the steady state flow change stage feature of rock can show as steady state flow variable Rate.Load phase at different levels for Mineral rheology is carried out initial stage decay stream change and the division in steady state flow change stage, the rheological rate in stage is become to the steady state flow of each loading grade and carries out mean value computation, obtain steady state flow variable Rate, wherein, the afterbody stream change stage also will reject the deformation data in accelerating rheology stage to calculate steady state flow variable Rate.
Further, get axial steady state flow variable Rate and volume steady state flow variable Rate as research object, with the deviatoric stress value of each loading grade for horizontal ordinate data, steady state flow variable Rate is ordinate data, utilization index function two steady state flow variable Rate curves described in matching respectively in plane coordinate system, plane coordinate system transverse axis is deviatoric stress (σ
1-σ
3)/MPa, wherein σ
1/ MPa is the axle pressure of rheological test, σ
3/ MPa is the confined pressure of rheological test, and the longitudinal axis is steady state flow variable Rate
Beneficial effect: the axial steady state flow variable Rate curve that Mineral rheology dynamic characteristic test achievement calculates by the present invention and volume steady state flow variable Rate curve compare, by the critical value of rock compressed distortion with volume dilatation, namely the intersection point of two steady state flow variable Rate curves determines the long-term strength parameter of rock quantitatively, overcome traditional stress-strain tautochrone bunch method and the steady state flow variable Rate method problem that flex point is fuzzy in the unconspicuous rock sample of rheological characteristics, to the long term stability problem of accurate evaluation rock, there is reference value.
Accompanying drawing explanation
Fig. 1 is the Mineral rheology dynamic characteristic test curve map of the present embodiment rock sample;
Fig. 2 is the inventive method determination Long-time strength of rock parameter schematic diagram.
Embodiment
Below technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment: the present invention obtains its rheology attribute testing curve and data by the rheology attribute testing of rock sample; The steady state flow variable Rate of load phase at different levels is calculated, simulates axis and volume steady state flow variable Rate curve by exponential function; Intersection point that is axial and volume flow variable Rate curve is utilized to determine the long-term strength parameter of rock quantitatively.
The concrete implementation step of the present embodiment is as follows:
1. utilize core bit to obtain the granite gneiss core sample of subsurface rock cave depot, being processed into is highly the standard cylindrical sample that 100mm, diameter are 50mm, core sample require intact, without damaged, add requirement in man-hour and do not destroy the original inner structure of rock sample.
2. the rock sample prepared is put on rock three axis flowing test instrument, get confined pressure (σ
3/ MPa) be stress value 4MPa practically suffered by rock in underground cavern, take the method for hierarchical loading to carry out triaxial rheology dynamic characteristic test.Before Mineral rheology dynamic characteristic test, first carry out the instantaneous dynamic characteristic test of three axles to batch sample, obtaining its peak strength is 224.50MPa; The original upload level of getting rheological test is 56% of instantaneous strength, is 125.00MPa after rounding; Every grade loads 5% of instantaneous peak value intensity subsequently, is 10.00MPa after rounding; As shown in Figure 1, ε in figure
1for axial strain, the ε of rock
3for hoop strain, the ε of rock
vfor the flow time parameter that the bulk strain of rock, t/h are rock; Every grade of flow time is 72 hours, to ensure that the distortion of rock sample tends towards stability, then carries out next stage loading, until after the 5th grade of loading, rock sample after 35 hours, accelerating rheology phenomenon occurs in stream change, finally rheodestruction occurs.
3. by triaxial rheological experiment data, the steady state flow of each loading grade is become stage speed and carries out mean value computation, obtain the steady state flow variable Rate that rock respectively loads grade, get axis and the volume flow variable Rate research object as steady state flow variable Rate, with the deviatoric stress value of each loading grade for horizontal ordinate data, steady state flow variable Rate is ordinate data, as shown in Figure 2, and utilization index Function Fitting goes out two steady state flow variable Rate curves in plane coordinate system, figure midplane coordinate system transverse axis (X-axis) is deviatoric stress ((σ
1-σ
3)/MPa), wherein (σ
1/ MPa) be the axle pressure of rheological test, (σ
3/ MPa) be the confined pressure of rheological test; The longitudinal axis (Y-axis) is steady state flow variable Rate
4., as shown in Figure 2, under rock is in low-stress state, axial steady state flow variable Rate (curve 1) specific volume steady state flow variable Rate (curve 2) wants large, and rock is in compression deformation state; Under rock is in higher stress state, volume steady state flow variable Rate (curve 2) sharply increases, exceed axial steady state flow variable Rate (curve 1), the rock failure mechanism of rock can occur in the short period, it is main that rock deformation is converted into volume dilatation by compression deformation.Therefore there is an intersection point 3 in axis and volume steady state flow variable Rate change curve.This intersection point is the critical value of rock compressed distortion and volume dilatation, and corresponding deviatoric stress value 153.20MPa is the long-term strength parameter value of this granite gneiss.
Claims (5)
1. the Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point, it is characterized in that: coring sample is processed into standard cylindrical sample, triaxial rheology dynamic characteristic test is carried out to standard cylindrical sample, the axial rheological rate and the volume flow variable Rate that are become the stage by steady state flow simulate two steady state flow variable Rate curves, utilize the intersection point of axis and volume flow variable Rate curve to determine the long-term strength parameter of rock quantitatively.
2. the Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point according to claim 1, is characterized in that: described core requires intact, nothing breakage, adds and does not destroy rock sample original inner structure man-hour.
3. the Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point according to claim 1, it is characterized in that: the confined pressure of described triaxial rheology dynamic characteristic test gets rock stress value suffered in Practical Project, take the method for hierarchical loading: before Mineral rheology dynamic characteristic test, first carry out the instantaneous dynamic characteristic test of three axles to batch sample, obtain instantaneous peak value intensity, the original upload level of rheological test gets 55% ~ 65% of transient assays peak strength, every grade loads 3% ~ 5% of instantaneous peak value intensity subsequently, round numerical value, every grade of loading is no less than 50 hours, until rock sample generation rheodestruction.
4. the Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point according to claim 3, it is characterized in that: load phase at different levels for Mineral rheology is carried out initial stage decay stream change and the division in steady state flow change stage, the rheological rate in stage is become to the steady state flow of each loading grade and carries out mean value computation, obtain steady state flow variable Rate, wherein, the afterbody stream change stage rejects the deformation data in accelerating rheology stage and calculates steady state flow variable Rate.
5. the Long-time strength of rock parameter determination method based on steady state flow variable Rate intersection point according to claim 1, it is characterized in that: utilization index function two steady state flow variable Rate curves described in matching respectively in plane coordinate system, plane coordinate system transverse axis is deviatoric stress (σ
1-σ
3)/MPa, wherein σ
1/ MPa is the axle pressure of rheological test, σ
3/ MPa is the confined pressure of rheological test, and the longitudinal axis is steady state flow variable Rate
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510369199.XA CN105021444B (en) | 2015-06-29 | 2015-06-29 | A kind of Long-time strength of rock parameter determination method based on stable state rheological rate intersection point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510369199.XA CN105021444B (en) | 2015-06-29 | 2015-06-29 | A kind of Long-time strength of rock parameter determination method based on stable state rheological rate intersection point |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105021444A true CN105021444A (en) | 2015-11-04 |
| CN105021444B CN105021444B (en) | 2017-06-23 |
Family
ID=54411579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510369199.XA Active CN105021444B (en) | 2015-06-29 | 2015-06-29 | A kind of Long-time strength of rock parameter determination method based on stable state rheological rate intersection point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105021444B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908324A (en) * | 2017-03-20 | 2017-06-30 | 河海大学 | A kind of Long-time strength of rock parameter determination method based on Casa Grande method |
| CN110542615A (en) * | 2019-09-06 | 2019-12-06 | 山东大学 | High-temperature triaxial unloading rheological test method for hard and brittle rock |
| CN110750894A (en) * | 2019-10-15 | 2020-02-04 | 河海大学 | Rock mass long-term stability safety analysis method based on long-term damage degree |
| CN111060404A (en) * | 2019-12-12 | 2020-04-24 | 中国电建集团华东勘测设计研究院有限公司 | Rock long-term strength calculation and determination method based on dimensionless processing |
| CN111678787A (en) * | 2020-06-16 | 2020-09-18 | 中国矿业大学 | Rock long-term strength determination method based on numerical fitting |
| CN111982779A (en) * | 2020-08-19 | 2020-11-24 | 河海大学 | Test method for simulating seepage deformation of pressure tunnel by hollow cylindrical rock sample |
| CN112903957A (en) * | 2021-01-18 | 2021-06-04 | 中国石油大学(华东) | Shale stress-damage-drilling fluid interaction experimental device and testing method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2167404C2 (en) * | 1999-05-05 | 2001-05-20 | Петров Валентин Алексеевич | Method of determination of long-term strength of materials |
| CN102128741A (en) * | 2010-11-23 | 2011-07-20 | 山东大学 | Triaxial rheological test process and method for hard and crisp rock |
| US20110259246A1 (en) * | 2008-10-10 | 2011-10-27 | Guynn John M | High early strength pozzolan cement blends |
| CN102621009A (en) * | 2012-03-21 | 2012-08-01 | 武汉大学 | Test method for simulating long-term deformation of rockfill |
| CN104132848A (en) * | 2014-08-13 | 2014-11-05 | 河海大学 | Method for determining long-term strength parameter of surrounding rock of underground water seal petroleum storage cavern |
| CN104458413A (en) * | 2013-09-18 | 2015-03-25 | 核工业北京地质研究院 | Method for determining crack initiation strength of rock under compressive conditions |
| CN104655825A (en) * | 2015-03-18 | 2015-05-27 | 中国电建集团成都勘测设计研究院有限公司 | Detection method for rheological behaviors of hard, fragile and crushed rock body of dam foundation |
-
2015
- 2015-06-29 CN CN201510369199.XA patent/CN105021444B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2167404C2 (en) * | 1999-05-05 | 2001-05-20 | Петров Валентин Алексеевич | Method of determination of long-term strength of materials |
| US20110259246A1 (en) * | 2008-10-10 | 2011-10-27 | Guynn John M | High early strength pozzolan cement blends |
| CN102128741A (en) * | 2010-11-23 | 2011-07-20 | 山东大学 | Triaxial rheological test process and method for hard and crisp rock |
| CN102621009A (en) * | 2012-03-21 | 2012-08-01 | 武汉大学 | Test method for simulating long-term deformation of rockfill |
| CN104458413A (en) * | 2013-09-18 | 2015-03-25 | 核工业北京地质研究院 | Method for determining crack initiation strength of rock under compressive conditions |
| CN104132848A (en) * | 2014-08-13 | 2014-11-05 | 河海大学 | Method for determining long-term strength parameter of surrounding rock of underground water seal petroleum storage cavern |
| CN104655825A (en) * | 2015-03-18 | 2015-05-27 | 中国电建集团成都勘测设计研究院有限公司 | Detection method for rheological behaviors of hard, fragile and crushed rock body of dam foundation |
Non-Patent Citations (2)
| Title |
|---|
| 崔希海 等: "岩石流变特性及长期强度的试验研究", 《岩石力学与工程学报》 * |
| 李良权 等: "基于流变试验的向家坝砂岩长期强度评价", 《工程力学》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106908324A (en) * | 2017-03-20 | 2017-06-30 | 河海大学 | A kind of Long-time strength of rock parameter determination method based on Casa Grande method |
| CN106908324B (en) * | 2017-03-20 | 2019-03-22 | 河海大学 | A kind of Long-time strength of rock parameter determination method based on Casa Grande method |
| CN110542615A (en) * | 2019-09-06 | 2019-12-06 | 山东大学 | High-temperature triaxial unloading rheological test method for hard and brittle rock |
| CN110750894A (en) * | 2019-10-15 | 2020-02-04 | 河海大学 | Rock mass long-term stability safety analysis method based on long-term damage degree |
| CN110750894B (en) * | 2019-10-15 | 2022-11-08 | 河海大学 | Rock mass long-term stability safety analysis method based on long-term damage degree |
| CN111060404A (en) * | 2019-12-12 | 2020-04-24 | 中国电建集团华东勘测设计研究院有限公司 | Rock long-term strength calculation and determination method based on dimensionless processing |
| CN111060404B (en) * | 2019-12-12 | 2022-09-13 | 中国电建集团华东勘测设计研究院有限公司 | Rock long-term strength calculation and determination method based on dimensionless processing |
| CN111678787A (en) * | 2020-06-16 | 2020-09-18 | 中国矿业大学 | Rock long-term strength determination method based on numerical fitting |
| CN111678787B (en) * | 2020-06-16 | 2022-05-17 | 中国矿业大学 | Rock long-term strength determination method based on numerical fitting |
| CN111982779A (en) * | 2020-08-19 | 2020-11-24 | 河海大学 | Test method for simulating seepage deformation of pressure tunnel by hollow cylindrical rock sample |
| CN112903957A (en) * | 2021-01-18 | 2021-06-04 | 中国石油大学(华东) | Shale stress-damage-drilling fluid interaction experimental device and testing method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105021444B (en) | 2017-06-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105021444A (en) | Steady rheology rate cross point-based determination method of rock long-time strength parameters | |
| CN105043905A (en) | Method for determining long-term strength parameter of rock based on steady-flow variable-rate tangent line | |
| CN104849134B (en) | Multistage stress grading loads the method that Long-time strength of rock is determined in Creep Mechanics test | |
| Zhang et al. | Triaxial creep tests of rock from the compressive zone of dam foundation in Xiangjiaba Hydropower Station | |
| CN104132848A (en) | Method for determining long-term strength parameter of surrounding rock of underground water seal petroleum storage cavern | |
| CN107505204A (en) | A kind of method that damage constructive model of rock mass is established based on least energy consumption principle | |
| CN102128741A (en) | Triaxial rheological test process and method for hard and crisp rock | |
| CN110726608B (en) | Shale brittleness evaluation method based on stress-strain curve energy evolution | |
| US20190271621A1 (en) | Method and device for determining elasticity of cement stone utilized in well cementing of oil-gas well | |
| CN109726411B (en) | Method for calculating fatigue strength of cabin structure of wind turbine | |
| CN110595887B (en) | Quantitative evaluation method for cave forming conditions of shallow hard rock large-scale underground cavern | |
| CN205103090U (en) | Pressure chamber structure of rock mechanics triaxial compression test machine | |
| CN103760008A (en) | Method for determining fracture closure stress of rock under uniaxial compression condition | |
| WO2019091134A1 (en) | Method for predicting water-rich levels of sandstone in coal seam roof | |
| CN113962003A (en) | Tunnel surrounding rock large deformation assessment method | |
| CN105606490B (en) | A kind of determination method of tight rock rheology permeability and bulk strain relationship | |
| CN109387433B (en) | Method for determining uniaxial long-term strength of rock based on inverse steady-state creep rate | |
| Lu et al. | Creep properties and a creep equation of delay outburst coal and its adjacent mudstone | |
| Chen et al. | Creep Properties of Mudstone Interlayer in Bedded Salt Rock Energy Storage Based on Multistage Creep Test: A Case Study of Huai’an Salt Mine, Jiangsu Province | |
| Wang et al. | Lagging collapse mechanism of gypsum-mined gob with rock creep | |
| CN111678787B (en) | Rock long-term strength determination method based on numerical fitting | |
| Meng-meng et al. | 1-D consolidation of a single soil layer with depth-dependent stress by multi-stage loading | |
| Sun et al. | Rheological Analysis of Soft Rock Unloading Combined with Finite Element Analysis Based on H‐K Constitutive Model | |
| CN110542615A (en) | High-temperature triaxial unloading rheological test method for hard and brittle rock | |
| CN112881184A (en) | Gravel brittleness index determination method and system based on whole-course stress strain |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |