CN114324483A - Method for measuring rock damage degree under blasting disturbance - Google Patents
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- 239000011435 rock Substances 0.000 title claims abstract description 127
- 238000005422 blasting Methods 0.000 title claims abstract description 71
- 230000006378 damage Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 83
- 238000005070 sampling Methods 0.000 claims abstract description 37
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 239000002360 explosive Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 15
- 238000013461 design Methods 0.000 claims description 7
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- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 claims description 6
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000010440 gypsum Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 238000002372 labelling Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 238000013100 final test Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000002591 computed tomography Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
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- 239000010438 granite Substances 0.000 description 1
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Abstract
The invention provides a method for measuring rock damage degree under blasting disturbance according to the principle of detecting the conductivity change condition of rock mass in a certain area before and after the blasting disturbance action and revealing the change of the internal damage degree of the rock mass, which comprises the following specific steps: drilling a rock test piece, measuring the conductivity of the rock test piece before blasting disturbance, measuring the conductivity of the rock test piece after blasting disturbance, establishing the relationship between the rock damage degree and the conductivity, the loading amount and the distance between the sampling point and the blasting center position, and analyzing the relationship according to test data. The invention has the advantages that: as a novel nondestructive testing means for rock damage degree under blasting disturbance, the method can enrich the testing means, and simultaneously can judge the damage condition of the rock under different blasting disturbance actions according to results, thereby achieving the purpose of optimizing blasting parameters.
Description
Technical Field
The invention belongs to the technical field of mine blasting and rock mechanics, and particularly relates to a method for measuring rock damage degree under blasting disturbance.
Background
In blasting engineering, the damage condition of rock media has a non-negligible influence on the blasting effect. Due to the existence of rock damage, the established propagation mode of the blasting seismic waves can be changed, and the final blasting effect is further influenced, so that the rock damage change under the blasting disturbance effect is measured, the understanding of people on the dynamic mechanical properties of rock materials can be improved, and reference can be provided for blasting parameter optimization. Dingweihua and the like firstly put forward the concept of density damage increment according to the physical principle of CT scanning, and describe the whole process of rock damage and destruction by observing the rock damage increment. Thamnson provides an assumption that acoustic emission and rock damage have consistency based on a statistical microscopic damage mechanics principle. Thanks and equality, the early young's modulus is discussed and the conditions of use are modified, with the fourth order damage tensor representing the damage variable for the change in elastic modulus.
The current search for new rock damage characterization quantities to determine rock damage change is still a hot research focus in the industry. The nondestructive detection mostly takes the longitudinal wave velocity of the rock as a measurement standard and adopts expensive nuclear magnetic resonance, CT and other means for detection. Because rock deformation and damage are a damage evolution process, the rock damage increment generated in the blasting process is closely related to the physical properties of the rock, and a novel rock damage change nondestructive detection means is searched on the basis of the common knowledge, so that the detection mode of rock damage can be enriched, and blasting parameter optimization can be guided.
Disclosure of Invention
The invention aims to provide a method for measuring rock damage degree under blasting disturbance, which establishes the relationship between rock damage increment delta and the change of conductivity before and after blasting, the loading Q and the distance r between a sampling point and an equivalent blasting center position by detecting the rock damage increment conditions before and after different blasting explosive quantities blasting action, and analyzes the relationship according to test data so as to achieve the purpose of guiding and optimizing blasting design.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a method for measuring rock damage degree under blasting disturbance, which is characterized by comprising the following steps of:
step 5, performing field blasting;
step 6, taking out all the rock test pieces placed in the step 4 according to the marked positions, repeating the step 2, and measuring the conductivity V of the rock test pieces after being disturbed by the blasting action2；
And 7, analyzing data by combining the acquired data, and establishing a relational expression (1) between rock damage quantity increment delta before and after blasting disturbance action and the change of conductivity before and after blasting, the loading quantity Q and the distance r between the sampling point and the equivalent blasting center position as follows:
in the formula, C is a correction coefficient related to rock wave impedance, and the value range is 0.01-1; q is the blasting explosive amount Kg; k is an adjusting parameter related to the explosive performance, and the value range is 1-2.82; and r is the distance m between the sampling point of the rock test piece and the equivalent core-bursting position.
Compared with the prior art, the invention has the advantages that:
1. the method for measuring the rock damage degree under the blasting disturbance has the advantages of strong universality and simple implementation, and the rock test piece sampling fully considers the relation between the blasting energy and the propagation distance, so that accurate data can be provided for the follow-up analysis of the change condition of the physical conductivity characteristic of the rock material under the action of the blasting disturbance.
2. The tested rock test piece is placed in the original position again, the actual damage condition of the rock body is closer, the accuracy and the reliability of the test result are ensured, and the implementation cost is far lower than that of nondestructive testing means such as nuclear magnetic resonance, CT and the like.
3. And establishing a relational expression between the rock damage increment delta before and after the blasting disturbance action and the change of the conductivity before and after blasting, the loading quantity Q and the distance r between the sampling point and the equivalent blasting center position, and analyzing according to test data, so that the blasting design can be guided to be optimized, and the blasting cost is reduced.
Drawings
FIG. 1 is a schematic diagram of the field implementation of the present invention
FIG. 2 is a flow chart of the technical steps of the present invention
The labels in fig. 1 are: 1. a blasting operation area; 2. equivalent blasting center positions of the blasting operation area; 3. blast holes; 4. rock specimen sampling point.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 and 2, the method for determining rock damage degree under blasting disturbance of the invention is characterized by comprising the following steps:
And 5, carrying out field blasting.
Step 6, taking out all the rock test pieces placed in the step 4 according to the marked positions, repeating the step 2, and measuring the conductivity V of the rock test pieces after being disturbed by the blasting action2。
And 7, analyzing data by combining the acquired data, and establishing a relational expression between the rock damage increment delta before and after the blasting disturbance action, the change of the conductivity before and after blasting, the loading Q and the distance r between the sampling point 4 and the equivalent blasting center position 2:
wherein C is a correction coefficient related to rock wave impedance; q is the explosive quantity (Kg); k is an adjusting parameter related to the explosive performance, and r is the distance (m) between the sampling point 4 of the rock test piece and the equivalent core position 2.
After the rock test piece is soaked in saline water with a certain concentration for saturated absorption, the self conductivity condition and the rock damage degree form a certain change rule, so the self damage change condition of the rock can be represented by the method.
And when the value range of the correction coefficient C related to the rock wave impedance is 0.01-1, selecting a numerical value according to the characteristics of the site rock in a reference range, and further improving the calculation accuracy.
When the value range of the adjusting parameter related to the explosive performance is 1-2.82, reasonable parameters are selected in a reference range according to the explosive type performance used in the actual blasting operation, so that the calculation result can more accurately represent the damage condition of the rock.
The following examples are given to illustrate the detailed embodiments and specific procedures, but the scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
Example 1
table 1: conductivity V of test piece1
and 4, putting the rock test piece back to the original sampling position according to the corresponding mark, namely 200-1 to 200m sampling points, 210-1 to 210m sampling points, 220-1 to 220m sampling points, and performing cementing treatment by using gypsum. Acquiring the loading Q of 20000Kg according to the field blasting design
Step 5, blasting operation is implemented;
step 6, taking out all the rock test pieces placed in the step 4 according to the marked positions, repeating the step 2, and measuring the conductivity V after the disturbance of blasting action2The specific conductivities are as follows:
table 2: conductivity V of test piece2
And 7, combining the acquired data, and according to the relational expressions between the rock damage increment delta before and after the blasting disturbance effect and the conductivity change before and after blasting, the loading quantity Q and the distance r between the sampling point and the equivalent blasting center position:
in the formula, the rock test piece is granite, C is a correction coefficient related to rock wave impedance, and 0.025 is taken; q is explosive with the explosive quantity of 20000Kg, k is an adjusting parameter related to the explosive performance, 1.2 is taken, and r is the distance between a rock test piece sampling point 4 and an equivalent core position 2, and is 200m, 210m and 220m respectively;
the final test piece 200-1 is a vibration damage variation Δ being 0.0411;
the final test piece 210-1 is a vibration damage variation Δ equal to 0.0277;
the final test piece 220-1 is a test piece with a vibration damage variation delta of 0.0154;
therefore, the damage variation of the rock mass in the area of 200-220m outside the measured explosion area under the action of the current explosion disturbance is 1.54-4.11%.
Example 2
table 3: conductivity V of test piece1
And 3, respectively putting the rock test pieces with the measured conductivity into glass open containers, and then putting the glass open containers into a constant-temperature air-blast drying oven for drying for 8 hours. Taking out the test piece after drying, and placing the test piece in a cool and ventilated place for 3-6h to normal temperature;
and 4, putting the rock test piece back to the original sampling position according to the corresponding label, namely 300-1 to 300m of the sampling point, 305-1 to 305m of the sampling point, 310-1 to 310m of the sampling point, 315-1 to 315m of the sampling point, and cementing the sampling point by gypsum. The loading Q obtained according to the field blasting design is 15000Kg
Step 5, blasting operation is implemented;
step 6, taking out all the rock test pieces placed in the step 4 according to the marked positions, repeating the step 2, and measuring the conductivity V after the disturbance of blasting action2The specific conductivities are as follows:
table 4: conductivity V of test piece2
And 7, combining the acquired data, and according to the relational expressions between the rock damage increment delta before and after the blasting disturbance effect and the conductivity change before and after blasting, the loading quantity Q and the distance r between the sampling point and the equivalent blasting center position:
in the formula, the rock test piece is sandstone, C is a correction coefficient related to rock wave impedance, and 0.807 is taken; q is the explosive with the explosive quantity of 15000Kg for blasting, k is an adjusting parameter related to the explosive performance, 1.5 is taken, and r is the distance between a sample point 4 of the test piece and an equivalent core position 2 and is respectively 300m, 305m, 310m and 315 m;
the final test piece 300-1 has a vibration damage variation Δ of 0.0175;
the final test piece 305-1 is a vibration damage variation Δ of 0.0173;
finally, the vibration damage variation delta of the test piece 310-1 is 0.0128;
the final test piece 315-1 is the vibration damage variation Δ being 0.0129;
therefore, the damage variation of the rock mass in the area of 300-315m outside the measured explosion area under the action of the disturbance of the current explosion is 1.28-1.75%.
Claims (2)
1. A method for measuring rock damage degree under blasting disturbance is characterized by comprising the following steps:
step 1, drilling a plurality of rock test pieces in a target rock mass area according to an increment L equal to the position of a blasting center, wherein the sampling depth is 0.5-1m in a rock layer, drilling the rock test pieces with the diameter of 50mm and the height of 100mm, recording the distance r between a sampling point and the position of an equivalent blasting center, and labeling the rock test pieces;
step 2, immersing the rock test piece into 10% saline water for vacuum saturation for 2-3h, and detecting the initial conductivity V of the rock test piece by using a conductivity meter1，10-3s/m；
Step 3, placing the rock test pieces with the measured conductivity into glass open containers respectively, then placing the containers into a constant-temperature blast drying oven for drying for 8 hours, taking out the rock test pieces after drying, placing the rock test pieces in a cool and ventilated place for cooling for 3-6 hours to normal temperature;
step 4, placing the rock test piece back to the original sampling position according to the corresponding mark, and performing cementation treatment by using gypsum; then, acquiring the loading Q data according to the field blasting design, and filling explosives at the blast hole position in the blasting operation area;
step 5, performing field blasting;
step 6, taking out all the rock test pieces placed in the step 4 according to the marked positions, repeating the step 2, and measuring the conductivity V of the rock test pieces after being disturbed by the blasting action2；
And 7, analyzing data by combining the acquired data, and establishing a relational expression (1) between rock damage quantity increment delta before and after blasting disturbance action and the change of conductivity before and after blasting, the loading quantity Q and the distance r between the sampling point and the equivalent blasting center position as follows:
in the formula, C is a correction coefficient related to rock wave impedance, and the value range is 0.01-1; q is the blasting explosive amount Kg; k is an adjusting parameter related to the explosive performance, and the value range is 1-2.82; and r is the distance m between the sampling point of the rock test piece and the equivalent core-bursting position.
2. The method for determining rock damage under blasting disturbance according to claim 1, wherein in step 1, if the rock specimen contains cracks with width larger than 0.5mm or depth larger than 2mm, an area with the same distance r as the center of burst should be selected for re-drilling the rock specimen.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117191830A (en) * | 2023-11-08 | 2023-12-08 | 中国矿业大学 | Rock low-temperature hydration damage degree testing method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020050222A1 (en) * | 1999-09-16 | 2002-05-02 | Kang Dae Woo | Rock blasting method using air bladders embedded in loading layers |
| CN108333256A (en) * | 2018-01-05 | 2018-07-27 | 辽宁科技大学 | The method for calculating Rock Damage degree under blast action based on rock CT scan |
| CN108344806A (en) * | 2018-01-05 | 2018-07-31 | 辽宁科技大学 | A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance |
| CN109813617A (en) * | 2019-01-18 | 2019-05-28 | 中国矿业大学(北京) | A kind of experimental method of quantitative analysis rock blasting damnification |
| CN111707708A (en) * | 2020-05-22 | 2020-09-25 | 中国地质大学（武汉） | CO2Method for obtaining blasting strain energy conversion coefficient and equivalent explosive calculation formula |
| CN112779901A (en) * | 2021-01-04 | 2021-05-11 | 北京科技大学 | Nondestructive testing method for tamping effect and bearing capacity of large-particle-size gravel foundation |
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- 2021-12-24 CN CN202111600646.XA patent/CN114324483B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020050222A1 (en) * | 1999-09-16 | 2002-05-02 | Kang Dae Woo | Rock blasting method using air bladders embedded in loading layers |
| CN108333256A (en) * | 2018-01-05 | 2018-07-27 | 辽宁科技大学 | The method for calculating Rock Damage degree under blast action based on rock CT scan |
| CN108344806A (en) * | 2018-01-05 | 2018-07-31 | 辽宁科技大学 | A method of Rock Damage degree under blast action is calculated based on nuclear magnetic resonance |
| CN109813617A (en) * | 2019-01-18 | 2019-05-28 | 中国矿业大学(北京) | A kind of experimental method of quantitative analysis rock blasting damnification |
| CN111707708A (en) * | 2020-05-22 | 2020-09-25 | 中国地质大学（武汉） | CO2Method for obtaining blasting strain energy conversion coefficient and equivalent explosive calculation formula |
| CN112779901A (en) * | 2021-01-04 | 2021-05-11 | 北京科技大学 | Nondestructive testing method for tamping effect and bearing capacity of large-particle-size gravel foundation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117191830A (en) * | 2023-11-08 | 2023-12-08 | 中国矿业大学 | Rock low-temperature hydration damage degree testing method |
| CN117191830B (en) * | 2023-11-08 | 2024-03-08 | 中国矿业大学 | Rock low-temperature hydration damage degree testing method |
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