CN112505095A - Rock freeze-thaw cycle duration measuring method based on core drilling - Google Patents
Rock freeze-thaw cycle duration measuring method based on core drilling Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005553 drilling Methods 0.000 title claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 40
- 230000008014 freezing Effects 0.000 claims abstract description 23
- 238000007710 freezing Methods 0.000 claims abstract description 23
- 238000010257 thawing Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000001035 drying Methods 0.000 claims description 14
- 238000010309 melting process Methods 0.000 claims description 8
- 239000008239 natural water Substances 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 4
- 239000003755 preservative agent Substances 0.000 claims description 4
- 230000002335 preservative effect Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000010998 test method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 63
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
A rock freezing and thawing cycle duration measuring method based on core drilling is based on a rock drilling method, measures temperature changes inside a rock sample by using temperature sensor measurement, and analyzes the change rule of time required for reaching complete freezing and thawing cycle along with the number of freezing and thawing cycle times by combining the number of freezing and thawing cycle times. The invention can quickly measure the change rule of the central temperature and the freeze-thaw cycle duration of the rock sample along with the increase of the freeze-thaw cycle times. And analyzing the change rule of the complete freeze-thaw cycle duration of the rock sample along with the increase of the number of freeze-thaw cycles according to the data result. Providing a basis for the required time in the freeze-thaw cycle test, and analyzing the change rule of the core temperature of the rock sample along with the time and the times.
Description
Technical Field
The invention relates to a freeze-thaw cycle test of rocks, in particular to a tuff internal temperature change measuring method based on a drilling technology.
Background
The freeze-thaw cycle of the rock is a common continuous natural weathering effect, and along with the gradual increase of the temperature difference between day and night and the temperature difference in four seasons, the degradation effect of the freeze-thaw cycle on the rock is gradually increased. The freeze-thaw cycle is divided into a freezing process and a thawing process, and the two processes are continuously and repeatedly alternated to accelerate the complex physical and chemical processes of the rock and the pore water, so that the mechanical properties of the rock are gradually deteriorated. Therefore, freeze-thaw cycling is one of the major factors causing many engineering damages such as slope instability, roadbed damage, etc. During the freeze-thaw cycle, the main factors affecting the internal properties of the rock are: lithology, water content, cycle times, cycle temperature range, cycle duration, etc. The study shows that along with the increase of the times of the freezing and thawing cycle, the duration of the freezing and thawing cycle of the rock sample also has corresponding change, and the duration of the freezing and thawing cycle used in the rock freezing and thawing cycle test of a plurality of scholars at present is the freezing and thawing cycle test specification time: freezing process for 4h, and thawing process for 4 h. And after 4 hours of the freezing process, whether the interior of the rock sample reaches the test specified test temperature or not is not analyzed, and similarly, whether the interior of the rock sample reaches the test specified test temperature or not is not analyzed after 4 hours of the melting process. The method is characterized in that the freezing and thawing duration is not complete, the overall temperature of the rock sample does not meet the test requirements, the rock sample belongs to an incomplete freezing and thawing state, and certain errors exist in the measured values of various mechanical indexes of the rock in the state, so that the safety evaluation of various projects is influenced. Therefore, the patent provides a tuff internal temperature change measuring method based on a drilling technology, which is used for measuring the freeze-thaw cycle test duration of a rock sample.
Disclosure of Invention
In order to overcome the defect that the conventional freeze-thaw cycle test cannot reflect the time law of the temperature required by the complete freeze-thaw cycle in the rock mass, the invention provides a rock freeze-thaw cycle duration measuring method based on core drilling. The method provides a basis for analyzing the temperature change rule in the freeze-thaw cycle of the rock and provides a basis for the time required by the freeze-thaw cycle.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a rock freeze-thaw cycle duration measuring method based on core drilling comprises the following steps:
1.1 processing the obtained original sample to prepare a sample, wherein the sample meets the specification of the sample in the test method of the International society of rock mechanics, and after the preparation of the sample is finished, the sample with obvious defects is firstly removed, and then the longitudinal wave velocity V of each sample is measured by a sound wave testerpDividing samples with similar wave velocities into a group;
1.2, drilling the center of the same group of samples;
1.3 before the first freeze-thaw cycle test, the internal temperature of the low-temperature test chamber is adjusted to T1The temperature of the constant temperature box is adjusted to T2Putting the sample into a drying oven at 107 +/-1 ℃ for drying for more than 24 hours, taking out the sample, and carrying out water saturation by adopting a natural water saturation method, wherein the water temperature is 20 +/-1 ℃;
1.4, taking out the sample after the water saturation time is longer than 48 hours, installing a temperature sensor, and plugging a hole by using plasticine at the hole opening to prevent the influence of the external temperature on the sensor as much as possible; after the test sample is installed, the test sample is wrapped by a preservative film, so that the influence of a large amount of water loss on the experiment in the freeze-thaw cycle process is prevented;
1.5 putting the processed sample into a low-temperature test box, and when the display value of a temperature acquisition instrument reaches T1When, the temperature and time are preservedData are stored and taken out;
1.6 put the sample taken out at a temperature T2In the thermostat, when the display value of the temperature collector reaches T2Taking out the mixture, namely, performing freeze thawing cycle;
1.7, repeating the step 1.5-1.6 until the number of freeze-thaw cycles is specified, and ending the test;
and 1.8, obtaining data of the time length required by the freezing process, the melting process and the complete freeze-thaw cycle according to the experimental result, and analyzing the experimental data to obtain the change rule of the time required by the rock freezing process, the melting process and the complete freeze-thaw cycle.
Further, in the step 1.1, the sample size is Φ 50mm × 100 mm.
Still further, in the step 1.2, the diameter of the hole is 6mm, and the depth is 25 mm.
Furthermore, in step 1.3, T1At-20 deg.C, -30 deg.C or-40 deg.C, T2The temperature is 20 ℃, 30 ℃ or 40 ℃, the sample is put into a drying oven at 107 ℃ for drying, and after 24 hours, the sample is taken out and saturated by adopting a natural water saturation method, wherein the water temperature is 20 ℃.
In the step 1.5, when the display value of the temperature collector reaches T1And storing the temperature and time data at +/-1 ℃ and taking out.
In the step 1.6, the taken sample is put at the temperature T2In the thermostat with +/-1 ℃, when the display value of the temperature acquisition instrument reaches T2Taking out at +/-1 ℃, namely one freeze-thaw cycle.
The technical conception of the invention is as follows: the method is based on a rock drilling method, measures the internal temperature change of the rock sample by using the temperature sensor, and analyzes the change rule of the time required for reaching the complete freeze-thaw cycle along with the number of freeze-thaw cycles by combining the number of freeze-thaw cycles.
The invention has the following beneficial effects: the change rule of the central temperature and the freeze-thaw cycle duration along with the increase of the freeze-thaw cycle times of the rock sample is rapidly measured. And analyzing the change rule of the complete freeze-thaw cycle duration of the rock sample along with the increase of the number of freeze-thaw cycles according to the data result. Providing a basis for the required time in the freeze-thaw cycle test, and analyzing the change rule of the core temperature of the rock sample along with the time and the times.
Drawings
FIG. 1 is a diagram of borehole and temperature measurement, wherein 1 is a temperature probe and 2 is a rock sample; and 3, a temperature measuring device.
Fig. 2 is an initial rock pattern.
FIG. 3 is a rock sample processing diagram.
Fig. 4 is a flowchart of the experiment.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 4, a rock freeze-thaw cycle duration measuring method based on core drilling comprises the following steps:
1.1 processing the obtained original sample to prepare a sample, wherein the sample meets the specification of the sample in the test method of the International society of rock mechanics, and after the preparation of the sample is finished, the sample with obvious defects is firstly removed, and then the longitudinal wave velocity V of each sample is measured by a sound wave testerpDividing samples with similar wave velocities into a group;
1.2, drilling the center of the same group of samples;
1.3 before the first freeze-thaw cycle test, the internal temperature of the low-temperature test chamber is adjusted to T1The temperature of the constant temperature box is adjusted to T2Putting the sample into a drying oven at 107 +/-1 ℃ for drying for more than 24 hours, taking out the sample, and carrying out water saturation by adopting a natural water saturation method, wherein the water temperature is 20 +/-1 ℃;
1.4, taking out the sample after the water saturation time is longer than 48 hours, installing a temperature sensor, and plugging a hole by using plasticine at the hole opening to prevent the influence of the external temperature on the sensor as much as possible; after the test sample is installed, the test sample is wrapped by a preservative film, so that the influence of a large amount of water loss on the experiment in the freeze-thaw cycle process is prevented;
1.5 putting the processed sample into a low-temperature test box, and when the display value of a temperature acquisition instrument reaches T1Then, storing the temperature and time data and taking out;
1.6 put the sample taken out at a temperature T2In the thermostat, when the temperature collector displays the valueTo reach T2Taking out the mixture, namely, performing freeze thawing cycle;
1.7, repeating the step 1.5-1.6 until the number of freeze-thaw cycles is specified, and ending the test;
and 1.8, obtaining data of the time length required by the freezing process, the melting process and the complete freeze-thaw cycle according to the experimental result, and analyzing the experimental data to obtain the change rule of the time required by the rock freezing process, the melting process and the complete freeze-thaw cycle.
Further, in the step 1.1, the sample size is Φ 50mm × 100 mm.
Still further, in the step 1.2, the diameter of the hole is 6mm, and the depth is 25 mm.
Furthermore, in step 1.3, T1At-20 deg.C, -30 deg.C or-40 deg.C, T2The temperature is 20 ℃, 30 ℃ or 40 ℃, the sample is put into a drying oven at 107 ℃ for drying, and after 24 hours, the sample is taken out and saturated by adopting a natural water saturation method, wherein the water temperature is 20 ℃.
In the step 1.5, when the display value of the temperature collector reaches T1And storing the temperature and time data at +/-1 ℃ and taking out.
In the step 1.6, the taken sample is put at the temperature T2In the thermostat with +/-1 ℃, when the display value of the temperature acquisition instrument reaches T2Taking out at +/-1 ℃, namely one freeze-thaw cycle.
In the embodiment, a tuff freeze-thaw cycle test is taken as an example to analyze the change condition of the freeze-thaw cycle time along with the increase of times, and the method comprises the following specific steps:
(1) the tuff in Ningbo area of Zhejiang is taken, the obtained sample is processed to prepare a sample with the diameter of 50mm multiplied by 100mm, and the sample meets the requirement of the aspect ratio of 2.0-2.5 in the test method of the international rock mechanics society. The unevenness deviation of two end faces is +/-0.05 mm in the specification of the manufacturing precision of the test piece. The end face is vertical to the axial surface of the test piece, and the angular deviation is not more than +/-0.25 degrees. The adjacent two surfaces of the cylinder are mutually vertical, and the deviation is less than +/-0.25 degrees.
(2) After the preparation of the samples is finished, the samples with obvious defects are firstly removed, and then the longitudinal wave velocity V of each sample is measured by a sound wave testerpThe sample with the wave velocity of 3.14m/s was sampledAnd (4) dividing into one group. The same set of samples was drilled centrally with a hole diameter of 6mm and a depth of 25 mm.
(3) The temperature in the low temperature test chamber is adjusted to-20 ℃, and the temperature in the constant temperature chamber is adjusted to 20 ℃ (the deviation of the temperature range of the test chamber is +/-1 ℃). Putting the tuff sample drilled with the holes into a drying box at 107 ℃ for drying, taking out the sample after 24 hours, saturating the sample by adopting a natural water saturation method (the water temperature is 20 ℃), taking out the sample after 48 hours, installing a temperature sensor, and plugging the holes by adopting plasticine at the hole openings, thereby preventing the influence of the external temperature on the sensor as much as possible. After the test sample is installed, the test sample is wrapped by the preservative film, so that the influence of a large amount of water loss on the experiment in the freeze-thaw cycle process is prevented.
(4) After the pretreatment is finished, the sample is firstly put into a low-temperature test box, a temperature acquisition instrument is started, and when the display value of the temperature acquisition instrument reaches minus 20 ℃ (± 1 ℃), the sample is taken out and the test data is stored.
(5) And (3) putting the taken tuff sample into a thermostat, and taking out and storing data when the display value of a temperature acquisition instrument reaches 20 ℃ (± 1 ℃), namely a freeze-thaw cycle.
(6) And (5) repeating the steps (4) and (5) until the number of freeze-thaw cycles required by the test is reached.
(7) Analyzing the experimental data to obtain that the change rule of the total freeze-thaw cycle duration along with the cycle number satisfies the power function trend (as shown in fig. 3), and obtaining the following formula:
y＝6.93x0.14-4.5
wherein: x is the number of freeze-thaw cycles, and y is the time (h) required for the complete freeze-thaw cycle of tuff for x times.
(8) The freezing process and the melting process also satisfy the power function growth trend, and the following formula is obtained:
and (3) freezing process: d is 2.09x0.29-0.14
Wherein: x is the number of freeze-thaw cycles, and D is the time required for the next tuff freezing process.
And (3) melting: r is 107.5 (x)0.0014-106.6)
Wherein: x is the number of freeze-thaw cycles, and R is the time required for the next tuff thawing process x times.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, which are intended for purposes of illustration only. The scope of the present invention should not be construed as being limited to the particular forms set forth in the examples, but rather as being defined by the claims and the equivalents thereof which can occur to those skilled in the art upon consideration of the present inventive concept.
Claims (6)
1. A rock freeze-thaw cycle duration measuring method based on core drilling is characterized by comprising the following steps:
1.1 processing the obtained original sample to prepare a sample, wherein the sample meets the specification of the sample in the test method of the International society of rock mechanics, and after the preparation of the sample is finished, the sample with obvious defects is firstly removed, and then the longitudinal wave velocity V of each sample is measured by a sound wave testerpDividing samples with similar wave velocities into a group;
1.2, drilling the center of the same group of samples;
1.3 before the first freeze-thaw cycle test, the internal temperature of the low-temperature test chamber is adjusted to T1The temperature of the constant temperature box is adjusted to T2Putting the sample into a drying oven at 107 +/-1 ℃ for drying for more than 24 hours, taking out the sample, and carrying out water saturation by adopting a natural water saturation method, wherein the water temperature is 20 +/-1 ℃;
1.4, taking out the sample after the water saturation time is longer than 48 hours, installing a temperature sensor, and plugging a hole by using plasticine at the hole opening to prevent the influence of the external temperature on the sensor as much as possible; after the test sample is installed, the test sample is wrapped by a preservative film, so that the influence of a large amount of water loss on the experiment in the freeze-thaw cycle process is prevented;
1.5 putting the processed sample into a low-temperature test box, and when the display value of a temperature acquisition instrument reaches T1Then, storing the temperature and time data and taking out;
1.6 put the sample taken out at a temperature T2In the thermostat, when the display value of the temperature collector reaches T2Taking out the mixture, namely, performing freeze thawing cycle;
1.7, repeating the step 1.5-1.6 until the number of freeze-thaw cycles is specified, and ending the test;
and 1.8, obtaining data of the time length required by the freezing process, the melting process and the complete freeze-thaw cycle according to the experimental result, and analyzing the experimental data to obtain the change rule of the time required by the rock freezing process, the melting process and the complete freeze-thaw cycle.
2. A method for measuring the duration of a freeze-thaw cycle of rock based on core drilling according to claim 1, wherein in step 1.1, the sample size is Φ 50mm x 100 mm.
3. A method for measuring the freeze-thaw cycle length of rock based on core drilling according to claim 1 or 2, wherein in step 1.2, the hole diameter is 6mm and the depth is 25 mm.
4. A method for measuring the freeze-thaw cycle duration of rock based on core drilling according to claim 1 or 2, wherein in step 1.3, T is1At-20 deg.C, -30 deg.C or-40 deg.C, T2The temperature is 20 ℃, 30 ℃ or 40 ℃, the sample is put into a drying oven at 107 ℃ for drying, and after 24 hours, the sample is taken out and saturated by adopting a natural water saturation method, wherein the water temperature is 20 ℃.
5. A method for measuring the duration of a freeze-thaw cycle of rock based on core drilling according to claim 1 or 2, wherein in step 1.5, when the temperature collector displays that the value T reaches T1And storing the temperature and time data at +/-1 ℃ and taking out.
6. A method for measuring the freeze-thaw cycle length of rock based on core drilling according to claim 1 or 2, wherein in step 1.6, the removed sample is placed in a temperature T2In the thermostat with +/-1 ℃, when the display value of the temperature acquisition instrument reaches T2Taking out at +/-1 ℃, namely one freeze-thaw cycle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114002053A (en) * | 2021-11-04 | 2022-02-01 | 湖南水利水电职业技术学院 | Freezing and thawing and loading synchronous test device and test method |
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| CN108982328A (en) * | 2018-08-14 | 2018-12-11 | 中南大学 | A kind of method that rock pore volume deforms under calculating unfreezing |
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- 2020-12-11 CN CN202011440191.5A patent/CN112505095A/en active Pending
Patent Citations (4)
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| JP2005156547A (en) * | 2003-10-31 | 2005-06-16 | Tokyo Electric Power Co Inc:The | Frost damage deterioration prediction device and its program |
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| CN108982328A (en) * | 2018-08-14 | 2018-12-11 | 中南大学 | A kind of method that rock pore volume deforms under calculating unfreezing |
Non-Patent Citations (1)
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| CN114002053A (en) * | 2021-11-04 | 2022-02-01 | 湖南水利水电职业技术学院 | Freezing and thawing and loading synchronous test device and test method |
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