CN111766123A - Preparation method of consolidated collapse column gap filler seepage sample - Google Patents
Preparation method of consolidated collapse column gap filler seepage sample Download PDFInfo
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- CN111766123A CN111766123A CN202010499836.6A CN202010499836A CN111766123A CN 111766123 A CN111766123 A CN 111766123A CN 202010499836 A CN202010499836 A CN 202010499836A CN 111766123 A CN111766123 A CN 111766123A
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- 239000000945 filler Substances 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 238000007596 consolidation process Methods 0.000 claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 16
- 238000011068 loading method Methods 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 5
- 239000011521 glass Substances 0.000 claims description 5
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 4
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 4
- 241001330002 Bambuseae Species 0.000 claims description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 4
- 239000011425 bamboo Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 22
- 238000011160 research Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 description 8
- 239000011435 rock Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000010797 grey water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001314 paroxysmal effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005464 sample preparation method Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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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
Abstract
The invention discloses a preparation method of a trapping column gap filler seepage sample in a consolidation state, belongs to the technical field of trapping column gap fillers, and aims to provide a preparation method of a trapping column gap filler seepage sample in a consolidation state; according to the aquifer water-rich condition of the producing area of the gap filler of the collapse column, the gap filler water content of the gap filler sample is configured, the on-site sample of the collapse column with a certain particle proportion is placed into a mould, and a test sample of the gap filler of the collapse column is prepared by utilizing a high-pressure consolidator to load in a grading mode according to the magnitude of the ground stress of the producing area of the gap filler of the collapse column. Provides a foundation for the seepage characteristic research of the gap filler in a consolidation state.
Description
Technical Field
The invention belongs to the technical field of a trapping column gap filler, and particularly relates to a preparation method of a seepage sample of the trapping column gap filler in a consolidation state.
Background
And (3) collapse of the column: the collapse column is used as a special geological structure in North China, mostly develops in Ordovician limestone, and is easy to become a water guide channel between a coal bed bottom plate and Ordovician limestone water to cause a large water inrush accident. The water inrush has the characteristics of hysteresis, paroxysmal property and the like, is one of the water damage types with the most serious casualties and economic losses, and is difficult to predict and prevent. Since the country is built, the water damage of the collapse column of China occurs for many times, all provinces in North China are traversed, and a large amount of economic loss and casualties are caused.
Trapped column gap filler: the trapping column gap filler is an important component of the North China type trapping column, and the seepage evolution disaster-causing process of the trapping column mainly comprises the following steps: the unconsolidated or consolidated collapse column is communicated with a coal bed and an Ordovician limestone aquifer, under the action of high-pressure Ordovician grey water, fillers inside the collapse column continuously migrate and run off, so that the internal void structure of the collapse column changes, the permeability is gradually increased, the water-resisting capacity is continuously weakened, and further the water inrush accident of the collapse column is caused.
The research is insufficient: at present, the research on the gap filler of the collapse column mostly adopts a fractured rock mass seepage method, and the occurrence state of the gap filler of the actual collapse column can be in various states such as dispersion, consolidation, cementation and the like. The fractured rock mass seepage method can effectively research the falling column gap filler in a discrete state; the sinking column gap filler is cemented and then becomes a rock again, so that the possibility of water inrush disaster is low; the consolidated state of the gap filler of the trapping column is easy to generate coal seam mining activation to form a water guide channel, but the research of the consolidated state of the gap filler of the trapping column is blank at present. Therefore, the application provides a preparation method of a bonded-state gap filler sample, and provides a basis for researching the seepage characteristics of the bonded-state gap filler.
Disclosure of Invention
The invention aims to provide a preparation method of a seepage sample of a trapping column gap filler in a consolidation state, and provides a foundation for researching the seepage characteristics of the gap filler in the consolidation state.
The invention adopts the following technical scheme:
a preparation method of a trapping column gap filler seepage sample in a consolidation state comprises the following steps:
firstly, calculating the proportion of gap filler particles: sampling the on-site filler, screening, wherein the screen holes used for screening are respectively 2.5mm, 5mm, 7.5mm and 10mm, samples with the grain diameters of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm are respectively obtained, weighing is respectively carried out, and the mass is respectively recorded as M1，M2，M3，M4Calculating the mass m of a sample to be prepared according to the density of the on-site filler and the volume of the die, and calculating the mass of particles of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm according to a formula, wherein the mass is respectively marked as m1，m2，m3，m4The calculation formula is as follows:
m1=M1/（M1+M2+M3+M4）×m；m2=M2/（M1+M2+M3+M4）×m；
m3=M3/（M1+M2+M3+M4）×m；m4=M4/（M1+M2+M3+M4）×m；
secondly, weighing particles with the particle sizes of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm respectively, adding water in proportion according to the water-rich condition of the water-bearing layer on site, stirring uniformly, and pouring into a mold; wherein, the water-bearing stratum of scene is divided into five types: a water-free water-containing layer, a weak water-rich water-containing layer, a medium water-rich water-containing layer, a strong water-rich water-containing layer and an extremely strong water-rich water-containing layer, wherein the corresponding water adding proportions are respectively 15%, 17.5-18%, 20%, 22-22.5% and 25%;
thirdly, placing the die into a triple high-pressure consolidation apparatus, carrying out graded consolidation loading on a sample in the die by using the consolidation apparatus, simultaneously recording the displacement of the sample every 2 hours by using a dial indicator, and applying next-stage load when the increment of the displacement is less than 0.008 mm/h;
and fourthly, according to the ground stress in the direction of the maximum principal stress, namely the ground stress with the maximum consolidation pressure in the direction of the maximum principal stress, after loading to a specified load, demoulding and drying the sample to obtain the final sample.
The mould includes an organic glass section of thick bamboo, the upper and lower both ends of an organic glass section of thick bamboo are equipped with permeable stone respectively, are equipped with filter paper between permeable stone and the filler sample respectively, and the top of the permeable stone of upper end is equipped with the pressure head.
The invention has the following beneficial effects:
the method comprises the steps of preparing a sample of a trapping column gap filler sample by using a consolidation drainage method, and determining the proportion of particles of the trapping column gap filler according to the particle size distribution rule of the trapping column gap filler production area; according to the aquifer water-rich condition of the producing area of the gap filler of the collapse column, the gap filler water content of the gap filler sample is configured, the on-site sample of the collapse column with a certain particle proportion is placed into a mould, and a test sample of the gap filler of the collapse column is prepared by utilizing a high-pressure consolidator to load in a grading mode according to the magnitude of the ground stress of the producing area of the gap filler of the collapse column. Provides a foundation for the seepage characteristic research of the gap filler in a consolidation state. The samples were prepared for mechanical property testing, such as tensile strength, compressive strength, shear strength, cohesion, internal friction angle, permeability, and the like. The test results can be used for engineering guidance, theoretical calculation and numerical simulation.
Drawings
FIG. 1 is a schematic structural view of a mold of the present invention;
wherein: 1-organic glass cylinder; 2-permeable stone; 3-filter paper; 4-pressing head; 5-sample.
Fig. 2 is a graph of the step loading of the present invention.
Detailed Description
A preparation method of a trapping column gap filler seepage sample in a consolidation state comprises the following steps:
firstly, calculating the proportion of gap filler particles: sampling the on-site filler, screening, wherein the screen holes used for screening are respectively 2.5mm, 5mm, 7.5mm and 10mm, samples with the grain diameters of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm are respectively obtained, weighing is respectively carried out, and the mass is respectively recorded as M1，M2，M3，M4Calculating the mass m of a sample to be prepared according to the density of the on-site filler and the volume of the die, and calculating the mass of particles of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm according to a formula, wherein the mass is respectively marked as m1，m2，m3，m4The calculation formula is as follows:
m1=M1/（M1+M2+M3+M4）×m；m2=M2/（M1+M2+M3+M4）×m；
m3=M3/（M1+M2+M3+M4）×m；m4=M4/（M1+M2+M3+M4）×m；
secondly, weighing particles with the particle sizes of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm respectively, adding water in proportion according to the water-rich condition of the water-bearing layer on site, stirring uniformly, and pouring into a mold; wherein, the water-bearing stratum of scene is divided into five types: a water-free water-containing layer, a weak water-rich water-containing layer, a medium water-rich water-containing layer, a strong water-rich water-containing layer and an extremely strong water-rich water-containing layer, wherein the corresponding water adding proportions are respectively 15%, 17.5-18%, 20%, 22-22.5% and 25%;
thirdly, placing the die into a triple high-pressure consolidation apparatus, carrying out graded consolidation loading on a sample in the die by using the consolidation apparatus, simultaneously recording the displacement of the sample every 2 hours by using a dial indicator, and applying next-stage load when the increment of the displacement is less than 0.008 mm/h;
and fourthly, according to the ground stress in the direction of the maximum principal stress, namely the ground stress with the maximum consolidation pressure in the direction of the maximum principal stress, after loading to a specified load, demoulding and drying the sample to obtain the final sample.
The density of the gap filler of the falling column is generally 1500-2000 kg/m3In the middle, the mould is a cylinder, after the load loading is finished, the height of the sample is 130mm, the diameter of the bottom surface is 50mm, the thickness of the pressure head is 10mm, the thickness of the permeable stone is 10mm, and the approximate mass m of each sample can be estimated.
The ground stress and the consolidation pressure can directly correspond to each other, for example, the ground stress in the direction of the maximum principal stress is 6MPa, then the maximum consolidation pressure is also 6MPa, the consolidation pressure needs to be loaded in a grading way, and the curve of the graded loading is shown in fig. 2. The samples were prepared for mechanical property testing, such as tensile strength, compressive strength, shear strength, cohesion, internal friction angle, permeability, and the like. The test results can be used for engineering guidance, theoretical calculation and numerical simulation.
According to the actual occurrence state of the gap filler of the collapse column, the change of different water contents and consolidation pressure is considered in the preparation process of the sample:
(1) different water contentω. Taking a certain sinking column as an example, the disclosed section has a local water spraying phenomenon, and the water content of the gap filler is higher. The maximum consolidation pressure of 3 MPa is kept unchanged during sample preparation, and the water content is respectively 15%, 18%, 20%, 22% and 25%.
(2) Different consolidation pressuresp. The vertical pressure of the collapse column sampling site is about 3 MPa, and the transverse structural stress is consideredUnder the condition of keeping the water content of 20%, the maximum consolidation pressure of the sample is respectively set to be 1 MPa, 2 MPa, 3 MPa, 4MPa, 5 MPa and 6MPa, namely the loading grades of 7 th to 12 th in figure 2.
Uniaxial compression, Brazilian splitting, triaxial compression and permeability tests are carried out on the samples of the gap filler of the collapse column under different water contents and consolidation pressures by adopting an MTS816.02 multifunctional testing machine, a DNS100 multifunctional testing machine and an MTS815.02 electro-hydraulic servo rock testing machine.
The collapse column is a complex geological structure formed by disordered accumulation of rock blocks, rock debris and the like with different sizes. The study objects herein are the interstitials widely distributed among the rock masses. For a well consolidated trap column, the permeability of the interstitial directly affects the permeability of the trap column as a whole. Under the influence of drilling or mining, the structure of the trapping column is easily disturbed to be loosened, so that the on-site acquisition of the trapping column gap filler sample is difficult. Thus, referring to the sample preparation method of the geotechnical test, the collapsed column gap filler sample is prepared by the consolidation test.
Example 1
The sample is taken from 2 mining areas of the sima coal mine of ChangZhi city, Shanxi province and is a sinking column gap filler, and the density and the mineral composition of the sample are shown in a table 1. The diameter of the sinking column gap filler sample prepared according to the preparation method is 50mm, the height of the sample before preparation is about 160mm, the height of the sample after drainage consolidation is about 130mm, the height of the sample used in uniaxial compressive strength test is 100mm, and the height of the sample used in seepage characteristic test is 50 mm.
TABLE 1 Density and mineral composition of the interstitials
Uniaxial compressive strength and seepage characteristic tests were respectively carried out, and the test results are shown in table 2.
TABLE 2 test results for uniaxial compressive strength and permeability
Example 2
The sample is taken from 5 mining areas of the sima coal mine of ChangZhi city, Shanxi province and is a sinking column gap filler, and the density and the mineral composition of the sample are shown in a table 3. The diameter of the sinking column gap filler sample prepared according to the preparation method is 50mm, the height of the sample before preparation is about 160mm, the height of the sample after drainage consolidation is about 130mm, the height of the sample used in uniaxial compressive strength test is 100mm, and the height of the sample used in seepage characteristic test is 50 mm.
TABLE 3 Density and mineral composition of the interstitials
Uniaxial compressive strength and seepage characteristic tests were performed respectively, and the test results are shown in table 4.
TABLE 4 test results for uniaxial compressive strength and permeability
Claims (2)
1. A preparation method of a trapping column gap filler seepage sample in a consolidation state is characterized by comprising the following steps: the method comprises the following steps:
firstly, calculating the proportion of gap filler particles: sampling the on-site filler, screening, wherein the screen holes used for screening are respectively 2.5mm, 5mm, 7.5mm and 10mm, samples with the grain diameters of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm are respectively obtained, weighing is respectively carried out, and the mass is respectively recorded as M1，M2，M3，M4Calculating the mass m of a sample to be prepared according to the density of the on-site filler and the volume of the die, and calculating the mass of particles of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm according to a formula, wherein the mass is respectively marked as m1，m2，m3，m4The calculation formula is as follows:
m1=M1/（M1+M2+M3+M4）×m；m2=M2/（M1+M2+M3+M4）×m；
m3=M3/（M1+M2+M3+M4）×m；m4=M4/（M1+M2+M3+M4）×m；
secondly, weighing particles with the particle sizes of 0-2.5mm, 2.5-5mm, 5-7.5mm and 7.5-10mm respectively, adding water in proportion according to the water-rich condition of the water-bearing layer on site, stirring uniformly, and pouring into a mold; wherein, the water-bearing stratum of scene is divided into five types: a water-free water-containing layer, a weak water-rich water-containing layer, a medium water-rich water-containing layer, a strong water-rich water-containing layer and an extremely strong water-rich water-containing layer, wherein the corresponding water adding proportions are respectively 15%, 17.5-18%, 20%, 22-22.5% and 25%;
thirdly, placing the die into a triple high-pressure consolidation apparatus, carrying out graded consolidation loading on a sample in the die by using the consolidation apparatus, simultaneously recording the displacement of the sample every 2 hours by using a dial indicator, and applying next-stage load when the increment of the displacement is less than 0.008 mm/h;
and fourthly, according to the ground stress in the direction of the maximum principal stress, namely the ground stress with the maximum consolidation pressure in the direction of the maximum principal stress, after loading to a specified load, demoulding and drying the sample to obtain the final sample.
2. The method of preparing a consolidated trap column interstitial seepage specimen of claim 1, wherein: the mould includes an organic glass section of thick bamboo, the upper and lower both ends of an organic glass section of thick bamboo are equipped with permeable stone respectively, are equipped with filter paper between permeable stone and the filler sample respectively, and the top of the permeable stone of upper end is equipped with the pressure head.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107101867A (en) * | 2017-05-25 | 2017-08-29 | 山东大学 | Coal seam Genesis of Karst Subsided Column gushing water model test similar materials and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107101867A (en) * | 2017-05-25 | 2017-08-29 | 山东大学 | Coal seam Genesis of Karst Subsided Column gushing water model test similar materials and preparation method |
Non-Patent Citations (1)
| Title |
|---|
| 张勃阳: "采动影响下陷落柱渗流演化规律试验研究", 《中国博士学位论文全文数据库工程科技Ⅰ辑》 * |
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Application publication date: 20201013 |