CN106989967B - Method for manufacturing soft rock disintegration test sample under combined action of wet-dry alternation and stress - Google Patents
Method for manufacturing soft rock disintegration test sample under combined action of wet-dry alternation and stress Download PDFInfo
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- CN106989967B CN106989967B CN201710178849.1A CN201710178849A CN106989967B CN 106989967 B CN106989967 B CN 106989967B CN 201710178849 A CN201710178849 A CN 201710178849A CN 106989967 B CN106989967 B CN 106989967B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
The invention relates to a method for manufacturing a soft rock disintegration test sample under the combined action of wet-dry alternation and stress. The sample preparation step comprises: (1) determining the size of a test sample; (2) manufacturing a square die; (3) preprocessing an original rock sample; (4) preparing cement mortar; (5) coating the rock in a mould by cement mortar to prepare a cuboid disintegration test sample; (6) maintaining the sample for 28 days, and dismantling the die; (7) post-treating a disintegration test sample; (8) preparation before disintegration test. The method for manufacturing the soft rock disintegration test sample under the combined action of the wet-dry alternation and the stress has the advantages of simple process, low cost and high success rate. The sample obtained by the method can be used for simulating the soft rock disintegration test under the combined action of wet-dry alternation and stress.
Description
Technical Field
The invention relates to the field of soft rock disintegration, in particular to a method for manufacturing a soft rock disintegration test sample under the combined action of wet-dry alternation and stress.
Background
The disintegration mechanism of the rock in the water level fluctuation zone is an important basis for evaluating the stability of the rock mass in the wading engineering, the disintegration process of the rock mass can be simulated and researched through an indoor rock disintegration test, and the reasonability of the preparation method of the rock sample in the disintegration test, particularly the reasonability of the preparation method of the rock sample in the soft rock disintegration test, can directly influence the reliability of the test result. In the preparation of the traditional rock disintegration sample, the rock sample is usually made into a cuboid sample by adopting a cutting method, but the soft rock is soft, when the sample is processed by adopting the traditional cutting method, the vibration generated by cutting inevitably causes the surface or local cracking and falling of the soft rock, so that the surface of the made sample is not uniform, and the uniform stress of the sample in the test (in a stress state) process cannot be ensured; and, water is added during cutting and the cutting blade is cooled to cause soft rock softening, and rock sample fracture is very easily caused after the soft rock softening, so that the sample preparation success rate is low. Therefore, the conventional cutting sample preparation method cannot prepare a sample for the soft rock disintegration test under the combined action of the wet-dry alternation and the stress.
Disclosure of Invention
The method aims to solve the problems that soft rock cannot be processed into a regular cuboid sample by a traditional cutting method, the success rate of sample preparation is low, and a disintegration test under the combined action of wet-dry alternation and stress cannot be carried out. The invention provides a method for manufacturing a soft rock disintegration test sample under the combined action of wet-dry alternation and stress, which has the advantages of high sample preparation success rate, small disturbance, regular shape and uniform surface of the prepared sample; the stress on the peripheral side surfaces of the sample is uniform in the test process, and the wet-dry alternating state of the water level fluctuation belt can be simulated.
The technical scheme adopted by the invention is as follows:
the method for manufacturing the soft rock disintegration test sample under the combined action of wet-dry alternation and stress comprises the following steps:
step 1: determining the specific size of a disintegration test sample according to the disintegration test requirements and the characteristics of a test device;
step 2: determining the internal size of the die according to the size of the sample, wherein the die can be flexibly disassembled;
and step 3: selecting an original sample used for research, wherein the size of the original sample is required to be smaller than the internal size of the mould, and wrapping the original sample by using a preservative film;
and 4, step 4: preparing cement mortar;
and 5: a disintegration test sample was prepared.
Step 6: putting the disintegration test sample into a curing room for curing, and removing a die outside the disintegration test sample;
and 7: wrapping the disintegration test sample by using a preservative film to prepare a disintegration test sample, and storing the disintegration test sample;
and 8: cutting the preservative film on the original sample in the disintegrated sample to expose the original sample naturally;
through the steps, the preparation of the soft rock disintegration test sample is completed.
The method comprises the steps of firstly coating a layer of mineral oil on the inner surface of a mould, then filling a certain amount of cement mortar into the mould, then putting an original sample wrapped by a preservative film into the mould, lightly pressing the upper surface of the original sample to enable the original sample to move downwards until the upper surface of the original sample is flush with the top of the mould, then adding the cement mortar into the mould until the inside of the mould is filled, at the moment, the upper surface of the original sample is just not covered by the cement mortar, finally, lightly vibrating the outer wall of the mould, discharging small bubbles in the cement mortar, and preliminarily preparing the disintegration test sample.
The cement mortar is about half of the internal volume of the mould. Through multiple tests, the cement mortar is about half of the internal volume of the die, so that the formed disintegrating sample is ensured to form a flat cuboid, and the condition that gaps are formed due to uneven filling of the cement mortar at the bottom and the side edges of the sample caused by the fact that the original sample is firstly placed and then the cement mortar is added or the cement mortar which is far less than about half of the internal volume of the die is firstly placed and then the sample is placed is avoided.
In the step, the irregular original sample is filled into a regular square sample in a square template frame through cement mortar; when cement mortar is used for filling the irregular original sample into the cuboid sample, the upper surface of the original sample is required to be flush with the top of the die.
The invention relates to a method for manufacturing a soft rock disintegration test sample under the combined action of wet-dry alternation and stress, which has the following beneficial effects:
1: in step 3, the purpose of wrapping the original sample with the preservative film is: the method prevents the cement mortar from filling the gaps of the original sample to change the strength of the original sample, thereby causing errors due to the influence on the disintegration experiment result.
2: in step 5, when the cement mortar is used for filling the irregular original rock sample into the cuboid sample, the upper surface of the rock sample is required to be flush with the top of the die, so that the prepared disintegration test sample is a cuboid sample with a regular shape, the end surface of the disintegration test sample is smooth, and the uniform stress of the sample in the process of a stress state test can be ensured.
3: in step 7, the purpose of wrapping the disintegrated specimen with a preservative film was: when the disintegration test is carried out, the cement mortar of the disintegration sample is prevented from contacting with the wetting soak solution in the wet-dry alternating process, so that the pollution of the soak solution is avoided and the test result is prevented from being influenced.
4: in step 8, the preservative film on the upper surface of the original sample in the disintegrated sample is cut off, so that the original sample is naturally exposed: the original sample can be contacted with water and air, and a water immersion surface and an air drying surface are provided for the humidification and drying states in the wet-dry alternative environment, so that the wet-dry alternative state of the water level fluctuation belt is simulated.
5: irregular original rock samples are filled into a regular square sample in a square template frame through cement mortar, so that the phenomenon that the vibration generated by the traditional cutting sample preparation method generates large disturbance, even the surface or local part of the original sample cracks and falls off is avoided, and therefore the sample preparation method provided by the invention has small disturbance on the rock samples, and is more beneficial to the accuracy of test results.
6: the method has the advantages of simple sample preparation process, low cost and high success rate, and the sample obtained by the method can be used for simulating the soft rock disintegration test under the combined action of wet-dry alternation and stress.
Drawings
FIG. 1 is a schematic flow chart of the present invention for preparing a disintegration test sample.
FIG. 2 is a three-dimensional schematic of an original rock sample.
FIG. 3 is a three-dimensional schematic view of a rock sample wrapped by a preservative film.
Fig. 4 is a schematic structural view of the mold.
Fig. 5 is a front view of the mold.
Fig. 6 is a left side view of the mold.
Fig. 7 is a top view of the mold.
Fig. 8 is a schematic view of cement mortar.
Fig. 9 is a three-dimensional schematic view of the mold internally filled with half of cement mortar.
FIG. 10 is a three-dimensional schematic of the sample produced in step 5.
Fig. 11 is a top view of the sample produced in step 5.
FIG. 12 is a sectional view A-A of the sample prepared in step 5.
FIG. 13 is a three-dimensional schematic of the sample made in step 6.
FIG. 14 is a three-dimensional schematic of the sample produced in step 7.
Fig. 15 is a top view of the sample produced in step 7.
FIG. 16 is a sectional view of sample B-B produced in step 7.
FIG. 17 is a three-dimensional schematic of the sample produced in step 8.
Fig. 18 is a front view of the sample produced in step 8.
Fig. 19 is a top view of the sample produced in step 8.
Detailed Description
The structural features of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a method for manufacturing a soft rock disintegration test sample under the combined action of wet-dry alternation and stress comprises the following steps:
step 1: determining the size of a cuboid sample to be prepared:
and determining the specific size of the disintegration test sample according to the disintegration test requirements and the characteristics of the test device. For example, when a test is conducted using a disintegration test apparatus under the combined action of a certain wet-dry alternation and stress, if the clear size in a rectangular sample cell in the apparatus is 200X 100mm, the disintegrated sample is a rectangular solid and has a size of 200X 100 mm.
Step 2: manufacturing a cuboid (including cube) mold 3; the die 3 is used for manufacturing cuboid (including cube) samples; the internal size of the die 3 is determined according to the size of the cuboid sample, and the die 3 can be flexibly disassembled.
As shown in fig. 4-7, the mold 3 includes a first side plate 8, a second side plate 11, a bottom plate 12, a transverse link 10, a vertical link 13, a first nut 9, a second nut 14, and a third nut 15; firstly, fixing a first side plate 8 and a second side plate 11 together by using a transverse connecting rod 10 and a first nut 9, and then fixing the first side plate 8 and the second side plate 11 on a bottom plate 12 by using a vertical connecting rod 13, a second nut 14 and a third nut 15, so that the die 3 is assembled and can be used; and (3) unscrewing the first nut 9, the second nut 14 and the third nut 15, and removing the transverse connecting rod 10 and the vertical connecting rod 13 to finish the disassembly of the mould 3.
And step 3: pretreatment of an original rock sample 1:
an original sample 1 used for research is selected, the size of the original sample 1 is required to be smaller than (the gap is larger than or equal to 3 cm) the internal size of a mould 3, and a preservative film 2 is used for wrapping the rock sample 1.
And 4, step 4: preparing cement mortar 4:
according to the experimental requirements, cement mortar 4 with certain strength grade (M5-M20) is prepared.
And 5: preparing a disintegration test sample:
firstly, a layer of mineral oil is coated on the inner surface of the mold 3, and then a certain amount of cement mortar 4 is filled into the mold 3, as shown in fig. 6, the filling amount is about half of the inner volume of the mold 3. Then put into mould 3 original sample 1 of plastic wrap 2 parcel, lightly press original sample 1 upper surface 5 and make original sample 1 move down, it flushes to reach original sample 1's upper surface 5 and mould 3 top, add cement mortar 4 in mould 3 again, until filling up inside mould 3, at this moment, original sample 1's upper surface 5 just is not covered by cement mortar 4, at last, shake mould 3 outer walls gently, discharge the little bubble in the cement mortar 4, tentatively make disintegration test sample 6.
Step 6: curing of the disintegration test sample:
and (4) putting the disintegration test sample 6 preliminarily prepared in the step (5) into a curing room for curing, and removing the die 3 outside the disintegration test sample after curing for 28 days.
And 7: post-treatment of disintegration test samples:
wrapping the disintegration sample 6 with the preservative film 2 to prepare a disintegration sample 7, and storing the sample.
And 8: preparation before disintegration test:
the prepared disintegration sample 7 is completely wrapped by the preservative film and can not be directly tested, and the preservative film 2 on the upper surface 5 of the original sample 1 in the disintegration sample 6 is cut off to enable the original sample 1 to be naturally exposed.
Claims (5)
1. The method for manufacturing the soft rock disintegration test sample under the combined action of wet-dry alternation and stress is characterized by comprising the following steps of:
step 1: determining the specific size of a disintegration test sample;
step 2: according to the size of the sample, the internal size of the die (3) is determined, and the die (3) can be flexibly disassembled;
and step 3: selecting an original sample (1) used for research, requiring that the size of the original sample (1) is smaller than the internal size of the mould (3), and wrapping the original sample (1) by using a preservative film (2);
and 4, step 4: preparing cement mortar (4): according to the experimental requirements, cement mortar (4) with a certain strength grade is prepared;
and 5: preparing a disintegration test sample (6);
step 6: putting the disintegration test sample (6) into a curing chamber for curing, and removing the die (3) outside the disintegration test sample;
and 7: wrapping the disintegration test sample (6) by using a preservative film (2) to prepare a disintegration test sample (7), and storing the disintegration test sample;
and 8: cutting the preservative film (2) on the original sample (1) in the disintegration sample (7) to expose the original sample (1) naturally;
through the steps, the preparation of the soft rock disintegration test sample is completed;
step 5 comprises the steps of firstly coating a layer of mineral oil on the inner surface of a mould (3), then filling a certain amount of cement mortar (4) into the mould (3), then putting an original sample (1) wrapped by a preservative film (2) into the mould (3), slightly pressing the upper surface (5) of the original sample (1), enabling the original sample (1) to move downwards until the upper surface (5) of the original sample (1) is flush with the top of the mould (3), then adding the cement mortar (4) into the mould (3) until the mould (3) is filled, at the moment, just not covering the upper surface (5) of the original sample (1) by the cement mortar (4), finally, slightly vibrating the outer wall of the mould (3), discharging small bubbles in the cement mortar (4), and preliminarily preparing a disintegration test sample (6).
2. The method for preparing the soft rock disintegration test sample under the combined action of the wet-dry alternation and the stress as claimed in claim 1, is characterized in that: the cement mortar (4) is half of the internal volume of the mould (3).
3. The method for preparing the soft rock disintegration test sample under the combined action of the wet-dry alternation and the stress as claimed in claim 1, is characterized in that: in the step 5, the irregular original sample (1) is filled into a regular square sample in a square template frame through cement mortar (4); when the irregular original sample (1) is filled with cement mortar (4) to form a cuboid sample, the upper surface (5) of the original sample (1) is required to be flush with the top of the mould (3).
4. The method for preparing the soft rock disintegration test sample under the combined action of the wet-dry alternation and the stress as claimed in claim 1, is characterized in that: the die (3) comprises a first side plate (8), a second side plate (11), a bottom plate (12), a transverse connecting rod (10), a vertical connecting rod (13), a first nut (9), a second nut (14) and a third nut (15); firstly, fixing a first side plate (8) and a second side plate (11) together by using a transverse connecting rod (10) and a first nut (9), and then fixing the first side plate (8) and the second side plate (11) on a bottom plate (12) by using a vertical connecting rod (13), a second nut (14) and a third nut (15), wherein the die (3) is assembled and can be used; and (3) unscrewing the first nut (9), the second nut (14) and the third nut (15), and removing the transverse connecting rod (10) and the vertical connecting rod (13), so that the mould (3) is disassembled.
5. The method for manufacturing the soft rock disintegration test sample under the combined action of the wet-dry alternation and the stress as claimed in any one of claims 1 to 4 is characterized in that: the prepared original sample is used for simulating the disintegration test under the combined action of wet-dry alternation and stress.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710178849.1A CN106989967B (en) | 2017-03-23 | 2017-03-23 | Method for manufacturing soft rock disintegration test sample under combined action of wet-dry alternation and stress |
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| CN201710178849.1A CN106989967B (en) | 2017-03-23 | 2017-03-23 | Method for manufacturing soft rock disintegration test sample under combined action of wet-dry alternation and stress |
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| CN106989967B true CN106989967B (en) | 2020-02-14 |
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| CN111504750B (en) * | 2020-05-27 | 2023-06-27 | 煤炭科学技术研究院有限公司 | Irregular coal rock sample preparation method |
| CN111964989B (en) * | 2020-07-14 | 2023-06-13 | 西华大学 | Easily-disintegrated rock mass saturation device and use method thereof |
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2017
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| CN102169061A (en) * | 2011-01-07 | 2011-08-31 | 河海大学 | Manufacture method for rock samples |
| CN102564868A (en) * | 2011-12-26 | 2012-07-11 | 中国地质大学（武汉） | Water-saturated shear box for water-rock interaction of soft rock |
| CN202599724U (en) * | 2012-04-23 | 2012-12-12 | 山东大学 | Tooling used for manufacturing complete-penetration fracture class rock material standard samples with different angles |
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