CN109765111A - A kind of determining Rock Under Uniaxial Compression compression classification adds the method for Loading ami deloading response ratio height in unloading test - Google Patents
A kind of determining Rock Under Uniaxial Compression compression classification adds the method for Loading ami deloading response ratio height in unloading test Download PDFInfo
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- CN109765111A CN109765111A CN201910108064.6A CN201910108064A CN109765111A CN 109765111 A CN109765111 A CN 109765111A CN 201910108064 A CN201910108064 A CN 201910108064A CN 109765111 A CN109765111 A CN 109765111A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
Abstract
The invention discloses the methods that Loading ami deloading response ratio (Load-Unload Response Ratio, LURR) in a kind of determining Rock Under Uniaxial Compression compression classification plus unloading test plays height.Uniaxial compression classification plus unloading test are carried out to cylindrical rock sample, obtain its stress-strain diagram, the difference for calculating the same level according to least square fitting method at every grade plus unloading test peak point and adding Loading ami deloading response ratio (LURR) value of unloading test, and then obtain adjacent two-stage Loading ami deloading response ratio is △ LURR.Corresponding △ LURR value after investigation 60% peak strength of rock sample, if three continuous △ LURR values are positive, show that rock Loading ami deloading response ratio occurs stepping up phenomenon, it is determined that the corresponding previous stage of first △ LURR in these three continuous △ LURR adds the peak point of unloading test to be height.
Description
Technical field
The present invention relates to Loading ami deloading response ratios in a kind of determining Rock Under Uniaxial Compression compression classification plus unloading test to play sentencing for height
Other method.
Background technique
Loading ami deloading response ratio (Load-Unload Response Ratio, LURR) theory is a kind of study of rocks or rock mass
Nonlinear damage omen and the theory for destroying forecast.Currently, concrete-cored DCM pile is in nonlinear systems such as earthquake, landslides
A series of progress are achieved in system unstability prediction.For rock sample compression damage problem, with the raising of loading force, when adding
When being downloaded to later stage (loading force is greater than 60% peak strength), sample can be entered the unstable hair in crack by elastic deformation stage
Exhibition is until collapse stage.When rock sample is in elastic deformation stage, invertibity is the essential characteristic of flexible deformation, is added
It is identical with unloading segment deformation modulus to carry section deformation modulus, rock sample enters crack instability development after collapse stage, rock
The deformation of stone sample has irreversibility, and loaded segment deformation modulus is less than deformation modulus when unloading, this differential disply
Mechanical properties of rock starts the trend of deterioration.This degradation trend very regular can be reflected in rock Loading ami deloading response ratio
Numerically, it is embodied in the raising with loading force, Loading ami deloading response ratio can step up increase.How to judge plus unloads
The problem of carrying the starting point of response ratio ascendant trend becomes most critical.This patent steps up rock Loading ami deloading response ratio
Starting point be defined as Loading ami deloading response ratio rise height.Since this ascendant trend of Loading ami deloading response ratio occurs to break in rock
Before bad, therefore prediction and the unstability grading for the nonlinear systems unstability such as can be used for rock.
What the position that accurate judgement rock Loading ami deloading response ratio plays height was destroyed for damage of rock evolutionary process and integrally
Prediction is of great significance.
Summary of the invention
The present invention proposes that a kind of determining Rock Under Uniaxial Compression compression classification adds the side of Loading ami deloading response ratio height in unloading test
Method.
A kind of determining Rock Under Uniaxial Compression compression classification adds the method for Loading ami deloading response ratio height in unloading test, specific practice
It is to be placed on cylindrical rock sample on rigid electro-hydraulic servo control of material testing machine, with the power control load speed of 12KN/min
Rate carries out uniaxial compression classification plus unloading test, obtains rock test and is at different levels plus unloading peak point Loading ami deloading response ratio.
ΔLURRι=LURRι-LURRι-1(ι >=2), Δ LURR in formulaιIt is poor for i-stage plus the corresponding Loading ami deloading response ratio of unloading test
Value, LURRιFor i-stage Loading ami deloading response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio.Investigate 60% peak value of rock sample
Corresponding Δ LURR value after intensity, if three continuous Δ LURR values are positive, that is, show rock Loading ami deloading response ratio occur by
Grade rise phenomenon, it is determined that the corresponding previous stage of first Δ LURR in these three continuous Δ LURR adds unloading test
Peak point has been height.
A kind of determining Rock Under Uniaxial Compression compression classification adds the method for Loading ami deloading response ratio height in unloading test, including following
Step:
Step 1: according to rock mechanics uniaxial compression test regulation, taking 1 cylindrical rock sample to be placed in rigidity electro-hydraulic
In servo Material Testing Machine, the conventional static load uniaxial compression test of progress is destroyed up to rock sample, obtains its ess-strain
Curve, using the peak value of the axial stress of rock sample as its uniaxial compressive strength σc；
Step 2: taking the cylindrical rock sample of 1 same size again, rock is tried with the loading speed of 12KN/min
Sample is loaded, and is loaded onto uniaxial compressive strength σ firstc4%, be then unloaded to 0, this load be used as the 1st grade of load,
Then it is loaded onto the 8% of uniaxial compressive strength again, is offloaded to 4%, as the 2nd grade of load；
Step 3: the rock sample for being unloaded to 0 in step 2 being reloaded to 12% again, 8% is offloaded to, as
3 grades of loads, and so on, step by step plus unloading is until rock sample destroys, to obtain each rock sample in uniaxial compression point
Stress-strain diagram in grade plus unloading test；
Step 4: being input with xial feed, axial strain is response, establishes Loading ami deloading response ratio model；Each plus unload
Carry peak point before and after loaded segment and unloading segment axial stress on, respectively take 1MPa data separately down from peak stress, point
The slope of loaded segment and unloading segment data point is not fitted；
Step 5: step 4 obtains the slope of loaded segment and the slope of unloading segment, and adding unloading segment response rate is its slope
Inverse, Loading ami deloading response ratios at different levels are the ratio of loaded segment response rate and unloading segment response rate.
Step 6: the change curve of Loading ami deloading response ratio obtained in analytical procedure 5 plays height and determines method are as follows: according to step
The loaded segment and unloading slope over 10 fitted in rapid 5, adding unloading segment response rate is the inverse of its slope, at different levels plus unloading peak
The Loading ami deloading response ratio of value point is the ratio of loaded segment response rate and unloading segment response rate, two neighboring Loading ami deloading response ratio
Difference be denoted as Δ LURR, Δ LURRι=LURRι-LURRι-1(ι >=2), Δ LURR in formulaιIt is corresponding for i-stage plus unloading test
Loading ami deloading response ratio difference, LURRιFor i-stage Loading ami deloading response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio；
Step 7: corresponding Δ LURR value after 60% peak strength of rock sample is investigated, if three continuous Δ LURR values
It is positive, that is, shows that rock Loading ami deloading response ratio occurs stepping up phenomenon, it is determined that first in these three continuous Δ LURR
The corresponding previous stage of a Δ LURR adds the peak point of unloading test to be height.
The diameter D of the cylindrical rock sample is taken as 48-52mm, and height L is 1.8~2.2 times of diameter length.Pass through
10 kinds of rocks are tested according to the method described above, propose that a kind of rock Loading ami deloading response ratio plays the judgment method of height.It utilizes
This method can determine that rock Loading ami deloading response ratio plays height.
Beneficial effect
The invention proposes Loading ami deloading response ratios in a kind of determining Rock Under Uniaxial Compression compression classification plus unloading test to play height
Method, defining the starting point that Loading ami deloading response ratio starts to step up in the present invention has been height, and proposes based on plus unload
It carries response ratio difference DELTA LURR and determines the method that rock Loading ami deloading response ratio plays height.Rock Loading ami deloading response ratio passes through its point
Grade plus unloading stress-strain diagram obtain, and add unloading test by the uniaxial compression classification to rock sample, according to least square
At different levels plus unloading peak point Loading ami deloading response ratio is calculated in fitting process, further according to formula, Δ LURRι=LURRι-LURRι-1
(ι >=2), Δ LURR in formulaιFor i-stage plus the corresponding Loading ami deloading response ratio difference of unloading test, LURRιFor i-stage plus unloading
Response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio.Corresponding Δ LURR after investigation 60% peak strength of rock sample
Value, if three continuous Δ LURR values are positive, that is, shows that rock Loading ami deloading response ratio occurs stepping up phenomenon, it is determined that this
The corresponding previous stage of first Δ LURR in three continuous Δ LURR adds the peak point of unloading test to be height.
The basic principle of concrete-cored DCM pile is: for rock sample compression damage problem, with mentioning for loading force
Height, when being loaded into later stage (loading force is greater than 60% peak strength), sample can be entered crack by elastic deformation stage not
Stable development is until collapse stage.When rock sample is in elastic deformation stage, invertibity is the substantially special of flexible deformation
Sign, loaded segment deformation modulus is identical with unloading segment deformation modulus, and rock sample enters crack instability development until rupture rank
Duan Hou, the deformation of rock sample have irreversibility, and loaded segment deformation modulus is less than deformation modulus when unloading, this difference
The different trend for showing mechanical properties of rock and starting deterioration.This degradation trend can very it is regular be reflected in rock and add unload
It carries response ratio numerically, is embodied in the raising with loading force, Loading ami deloading response ratio can step up increase.How
The problem of judging the starting point of Loading ami deloading response ratio ascendant trend becomes most critical.There is rock Loading ami deloading response ratio in this patent
The starting point stepped up is defined as Loading ami deloading response ratio and plays height.Since this ascendant trend of Loading ami deloading response ratio occurs
Before the rock failure mechanism of rock, therefore prediction and the unstability grading for the nonlinear systems unstability such as can be used for rock.
Detailed description of the invention
Fig. 1 is the flow diagram of the method for the invention；
Fig. 2 is cylindrical sample stereoscopic schematic diagram；
Fig. 3 is rock sample classification plus unloading scheme；
Fig. 4 is that rock sample adds unloading stress-strain curve；
Fig. 5 adds loaded segment and unloading segment in unloading test to be fitted signal certain level-one using least square fitting method
Figure；
Fig. 6 is to determine that Loading ami deloading response ratio plays height figure according to LURR differential technique.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is described further.
Embodiment 1:
Rock conventional one-axis compression classification plus unloading test are carried out in MTS815 electro-hydraulic servo testing machine, to rock
Loading ami deloading response ratio plays height and is judged.
As shown in Figure 1, Loading ami deloading response ratio plays the side of height in a kind of determining Rock Under Uniaxial Compression compression classification plus unloading test
Method, comprising the following steps:
(1) as shown in Figure 1, should follow these steps to carry out: the sillar of acquirement is processed into cylindrical sample by field sampling
(such as Fig. 2), diameter D are taken as 48-52mm, and the length L of sample takes 1.8~2.2 times of diameter,
(2) according to rock mechanics uniaxial compression test regulation, 1 cylindrical rock sample is taken to be placed in rigid electro-hydraulic servo
In Material Testing Machine, the conventional static load uniaxial compression test of progress is destroyed up to rock sample, obtains its ess-strain song
Line, using the peak value of the axial stress of rock sample as its uniaxial compressive strength σc；
(3) cylindrical rock sample of 1 same size is taken again, and rock is carried out with identical power control loading speed
Uniaxial compression classification plus unloading test are added unloading scheme referring to Fig. 3, are carried out with the loading speed of 12KN/min to rock sample
Load, is loaded onto uniaxial compressive strength σ firstc4%, be then unloaded to 0, this load be used as the 1st grade of load, then again
It is secondary to be loaded onto the 8% of uniaxial compressive strength, it is offloaded to 4%, as the 2nd grade of load；It reloads to 12%, is offloaded to 8%, makees
For the 3rd grade of load, and so on, step by step plus unloading is until rock sample destroys, and presses to obtain each rock sample in single shaft
Division grade adds the stress-strain diagram in unloading test referring to fig. 4；
(4) obtain rock sample classification add unloading stress-strain diagram after, analysis stress-strain diagram determines every first
The position of grade plus unloading peak point, loaded segment and unloading segment at every grade plus before and after unloading peak point take 1MPa length respectively
Data point fits the slope of loaded segment and unloading segment data point respectively.Adding unloading segment response rate is the inverse of its slope,
Loading ami deloading response ratios at different levels are the ratio of loaded segment response rate and unloading segment response rate, such as Fig. 5, according to least square fitting
The fitting formula of method, loaded segment 1MPa data and unloading segment 1MPa data is respectively y=6401.8x-1.4122, y=
16561.0x-9.6667 (y indicates axial stress in fitting formula, and x indicates axial strain), loaded segment 1MPa data and unloading
The slope of section 1MPa data is respectively 6401.8,16561.0, then the response of loaded segment 1MPa data and unloading segment 1MPa data
Rate is respectively 1/6401.8,1/16561.0, the same level add unloading peak point Loading ami deloading response ratio be
(5) rock sample is calculated in Loading ami deloading response ratios at different levels plus unloading point, obtains Loading ami deloading response ratio with axial direction
The change curve of strain, the difference of two neighboring Loading ami deloading response ratio are denoted as Δ LURR, Δ LURRι=LURRι-LURRι-1(ι≥
2), Δ LURR in formulaιFor i-stage plus the corresponding Loading ami deloading response ratio difference of unloading test, LURRιFor i-stage plus unloading response
Than LURRι-1For (i-1)-th grade of Loading ami deloading response ratio；
(6) such as Fig. 6, corresponding Δ LURR value after 60% peak strength of rock sample is investigated, if three continuous Δs
LURR value is positive, that is, shows that rock Loading ami deloading response ratio occurs stepping up phenomenon, it is determined that in these three continuous Δ LURR
The corresponding previous stage of first Δ LURR add the peak point of unloading test to be height.
Embodiment 2:
By taking green sandstone as an example, determine that the Loading ami deloading response ratio of the classification of blueness sandstone uniaxial compression plus unloading test plays height, tool
Body process is as follows:
Step1: it is 50mm that the sillar that engineering site is fetched, which is processed into diameter, and the cylindrical rock that length is 100mm tries
Sample takes 1 cylindrical rock sample to carry out conventional one-axis compression test in MTS815 electro-hydraulic servo testing machine, with load
The power that rate is 12KN/min controls loading method and is loaded, and obtains its stress-strain diagram, the axial stress of rock sample
Peak value be 80.1MPa, therefore the uniaxial compressive strength σ of green sandstone samplec=80.10MPa.
Step2: according to the uniaxial compressive strength σ obtained in step1cValue, determine level-one load be 3.2MPa, second level,
Three-level load is 6.4MPa, 9.6MPa, and every grade of loading ratio upper level load increases 3.2MPa, adds unloading step by step until rock in this way
Stone sample destroys.
Step3: taking the rock sample of 1 same size, carries out uniaxial compression classification plus unloading examination to rock sample respectively
It tests, rock sample is loaded with the loading speed of 12KN/min, add unloading manner such as Fig. 3, be loaded onto uniaxial compressive first
4% (i.e. 3.2MPa) of intensity, is then unloaded to 0, this load is used as the 1st grade of load；Then it is loaded onto uniaxial compressive again
8% (i.e. 6.4MPa) of intensity, is offloaded to 4% (i.e. 3.2MPa), as the 2nd grade of load；It reloads to 12% (i.e.
9.6MPa), it is offloaded to 8% (i.e. 6.4MPa), as 3rd level load, and so on, step by step plus unloading is until rock sample is broken
It is bad, to obtain stress-strain diagram of the rock sample in uniaxial compression classification plus unloading test.
Step4: each plus unloading peak point position is determined to the analysis of stress-strain diagram obtained in step3, every
In the axial stress of a loaded segment added before and after unloading peak point and unloading segment, 1MPa is respectively taken separately down from peak stress
Data calculate Loading ami deloading response ratio using least square fitting method, and concrete operations are to add unloading peak value as the upper limit using at different levels, with
At different levels plus unloading peak point is that respectively to take 1MPa in loaded segment and unloading segment be lower limit to starting point, respectively according to least square fitting method
Calculate the slope of loaded segment and the slope of unloading segment.
The slope of loaded segment and the slope of unloading segment, the response of loaded segments and unloading segment at different levels are obtained in step5:step4
Rate is the inverse of loaded segment and unloading slope over 10, and at different levels plus unloading peak point Loading ami deloading response ratio is by loaded segment response rate
It is obtained with the ratio calculation of unloading segment response rate.The green sandstone first order adds the corresponding axial stress of unloading peak point to be 3.2MPa,
Using peak point as starting point, the axial stress strain data of 3.2~2.2MPa is taken in loaded segment and unloading segment axis respectively, using most
Small two slopes for multiplying 3.2~2.2MPa axial stress strain data that fitting process fits loaded segment are 9931.3, unloading segment
The slope of 3.2~2.2MPa axial stress strain data is 19663.1.The green sandstone first order add unloading peak point loaded segment and
The response rate of unloading segment is respectively 1/9931.1 and 1/19663.1, and first order Loading ami deloading response ratio is loaded segment response rate and unloads
Carry the ratio of section response rate:Equally, following at different levels adding can be calculated by above-mentioned algorithm unload response
Than (occurrence is shown in Table 1).
Step6: green sandstone is calculated in Loading ami deloading response ratios at different levels plus unloading point, it is bent to obtain Loading ami deloading response ratio variation
Line.The difference for remembering adjacent two-stage Loading ami deloading response ratio is Δ LURR, Δ LURRι=LURRι-LURRι-1(ι >=2), Δ in formula
LURRιFor i-stage plus the corresponding Loading ami deloading response ratio difference of unloading test, LURRιFor i-stage Loading ami deloading response ratio, LURRι-1
2 to the 25 grades of Δ LURR such as table 1 calculated according to the method described above for (i-1)-th grade of Loading ami deloading response ratio, green sandstone.
Step7: corresponding Δ LURR value after 60% peak strength of green sandstone is investigated.Since the 15th grade plus unloading point
(15 grades add the corresponding axial stress of unloading point to be 48MPa) is investigated, as shown in table 1, the 21st grade of Δ LURR=-0.03, Zhi Hou
22 grades, 23 grades and 24 grades and later Δ LURR are positive, therefore the 21st grade adds unloading peak point to be adding for green sandstone to unload response
Compared with height.
The green sandstone Loading ami deloading response ratio of table 1 plays height and differentiates result
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, it should be understood by those ordinary skilled in the art that: still can be to of the invention specific
Embodiment is modified or replaced equivalently, and without departing from any modification of spirit and scope of the invention or equivalent replacement,
It is intended to be within the scope of the claims of the invention.
Claims (4)
1. a kind of method that Loading ami deloading response ratio plays height in determining Rock Under Uniaxial Compression compression classification plus unloading test, feature exist
In cylindrical rock sample is placed on rigid electro-hydraulic servo control of material testing machine, is carried out with the loading speed of 12KN/min
Uniaxial compression classification plus unloading test obtain rock sample under uniaxial compression classification plus unloading condition until rock sample destruction
Stress-strain diagram, the same level is calculated according to least square fitting method at every grade plus unloading test peak point and adds unloading test
Loading ami deloading response ratio (Load-Unload Response Ratio, LURR) value, and then obtain rock sample plus unloading ring
It should be than the change curve with axial strain.The difference for remembering adjacent two-stage Loading ami deloading response ratio is Δ LURR, Δ LURRι=LURRι-
LURRι-1(ι >=2), Δ LURR in formulaιFor i-stage plus the corresponding Loading ami deloading response ratio difference of unloading test, LURRιFor i-stage plus
Unload response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio.Corresponding Δ after investigation 60% peak strength of rock sample
LURR value shows that rock Loading ami deloading response ratio occurs stepping up phenomenon if three continuous Δ LURR values are positive, it is determined that
The corresponding previous stage of first Δ LURR in these three continuous Δ LURR adds the peak point of unloading test to be height.
2. the method according to claim 1, wherein the rock adds in uniaxial compression classification plus unloading test
Unloading response is as follows compared with height determination process:
Step 1: according to rock mechanics uniaxial compression test regulation, 1 cylindrical rock sample being taken to be placed in rigid electro-hydraulic servo
On control of material testing machine, with the power control loading speed load of 12KN/min until rock sample destroys, obtains its stress and answer
Varied curve, using the peak value of the axial stress of rock sample as its uniaxial compressive strength σc；
Step 2: take the cylindrical rock sample of 1 same size again, with the loading speed of 12KN/min to rock sample into
Row load, is loaded onto uniaxial compressive strength σ firstc4%, be then unloaded to 0, this load be used as the 1st grade of load, then again
It is secondary to be loaded onto the 8% of uniaxial compressive strength, it is offloaded to 4%, as the 2nd grade of load；It reloads to 12%, is offloaded to 8%, as
3rd level load, and so on, step by step plus unloading is until rock sample destroys, to obtain each rock sample in uniaxial compression
Stress-strain diagram in classification plus unloading test；
Step 3: stress-strain diagram obtained in step 2 being analyzed and determines each plus unloading peak point position, is added each
In the axial stress for unloading the loaded segment and unloading segment before and after peak point, respectively take 1MPa data sharp separately down from peak stress
Loading ami deloading response ratio is calculated with least square fitting method.Concrete operations are using at different levels plus unloading peak point as the upper limit, in loaded segment
1MPa data are respectively taken with unloading segment, fit the slope of loaded segment and the slope of unloading segment respectively according to least square fitting method；
Step 4: according to the loaded segment and unloading slope over 10 fitted in step 3, adding unloading segment response rate is falling for its slope
Number, Loading ami deloading response ratios at different levels are the ratio of loaded segment response rate and unloading segment response rate, remember that adjacent two-stage adds unloading to respond
The difference of ratio is Δ LURR, Δ LURRι=LURRι-LURRι-1(ι >=2), Δ LURR in formulaιIt is corresponding for i-stage plus unloading test
Loading ami deloading response ratio difference, LURRιFor i-stage Loading ami deloading response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio；
Step 5: corresponding Δ LURR value after 60% peak strength of rock sample is investigated, if three continuous Δ LURR values are
Just, that is, show that rock Loading ami deloading response ratio occurs stepping up phenomenon, it is determined that first in these three continuous Δ LURR
The corresponding previous stage of Δ LURR adds the peak point of unloading test to be height.
3. method according to claim 1 or 2, which is characterized in that calculate at different levels according to least square fitting method plus unload
The LURR of loading point is loaded onto after the 60% of rock peak strength, calculates two neighboring plus unloading point LURR difference DELTA LURR,
Calculation formula is Δ LURRι=LURRι-LURRι-1(ι >=2), Δ LURR in formulaιFor i-stage plus unloading test it is corresponding plus unloading
Response ratio difference, LURRιFor i-stage Loading ami deloading response ratio, LURRι-1For (i-1)-th grade of Loading ami deloading response ratio.
4. the method according to claim 1, wherein the diameter D of the cylindrical rock sample is taken as 48-
52mm, height L are 1.8~2.2 times of diameter length.
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| CN201910430741.6A CN110044717B (en) | 2019-02-02 | 2019-05-22 | Method for determining loading and unloading response ratio change point in rock uniaxial compression test |
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| JP3962810B2 (en) * | 2003-02-19 | 2007-08-22 | 独立行政法人産業技術総合研究所 | Multiaxial crystal orientation material comprising nylon-11 / polyvinylidene fluoride blend film |
| US7203604B2 (en) * | 2004-02-27 | 2007-04-10 | Bridgestone Firestone North American Tire, Llc | Method of predicting mechanical behavior of polymers |
| 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 |
| CN103558360A (en) * | 2013-11-11 | 2014-02-05 | 青岛理工大学 | Method for determining critical instable starting rainfall capacity of rainfall type landslip |
| CN103760008A (en) * | 2014-01-29 | 2014-04-30 | 核工业北京地质研究院 | Method for determining fracture closure stress of rock under uniaxial compression condition |
| CN106442736B (en) * | 2016-12-06 | 2023-04-07 | 河南理工大学 | Testing device, testing system and testing method for uniaxial compression measurement of impact tendency index and acoustic characteristic of gas-containing coal |
| CN107991184A (en) * | 2017-11-27 | 2018-05-04 | 中南大学 | A kind of Rock burst proneness Grade Judgment based on residual elasticity strain energy index |
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2019
- 2019-02-02 CN CN201910108064.6A patent/CN109765111A/en active Pending
- 2019-05-22 CN CN201910430741.6A patent/CN110044717B/en active Active
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| CN110044717A (en) | 2019-07-23 |
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