CN111812300A - Preparation material for remolding coal series mud rock sample and batch preparation method thereof - Google Patents
Preparation material for remolding coal series mud rock sample and batch preparation method thereof Download PDFInfo
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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Abstract
The invention belongs to the field of rock mechanics experiments, and relates to a preparation material for remolding coal-series mud rock samples, which comprises the following components: the coal powder comprises coal powder, bentonite, clay, quartz sand, cement and water, wherein the mass ratio of each component is as follows: coal powder accounts for 5-15% of the total material, bentonite accounts for 10-20% of the total material, clay accounts for 5-10% of the total material, quartz sand accounts for 30-40% of the total material, cement accounts for 5-15% of the total material, and the balance is water, in a laboratory, the water absorption characteristic and the expansion deformation characteristic of mudstone are simulated by using the characteristics of calcium-based bentonite or sodium-based bentonite, the sand composition and the strength of the mudstone are simulated by using the characteristics of the quartz sand and the cement, a certain amount of field coal samples, clay and purified water are added, remolded experimental rock samples are obtained by using a special plastic drying grinding tool according to different proportions to carry out rock mechanics experiments, and the proportion which is closest to the mechanical properties of the field rock samples is selected to prepare the carbon mudstone samples in batches for mechanical evaluation.
Description
Technical Field
The invention belongs to the field of rock mechanics experiments, relates to a preparation material for remolding coal-series mud rock samples and a batch preparation method thereof, and particularly relates to a preparation material for remolding coal-series mud rock samples for reducing the mechanical properties of coal-series mud rock and a batch preparation method thereof.
Background
The coal series carbonaceous mudstone is a sedimentary rock series associated with a coal bed, and has larger lithological change. In the field rock sample taking research, the mechanical properties of the obtained rock samples are different, and more uniform mechanical parameter comparison data are difficult to obtain through laboratory experiments.
The invention patent with publication number CN110482988A discloses a weakly expansive mudstone similar material and a preparation method thereof, wherein the weakly expansive mudstone similar material comprises the following components of bentonite, barite powder, rosin alcohol solution, gypsum and quartz sand. Wherein the mass ratio of each component in the total material is as follows: 5-20% of bentonite, 10-40% of barite powder, 7% of rosin alcohol solution, 0-3% of gypsum and quartz sand which are filled when the sum of the proportion of the materials is less than 1. The preparation method comprises the steps of dissolving powdered rosin by using ethanol to obtain a rosin alcohol solution, weighing the bentonite, the barite powder, the gypsum and the quartz sand according to a preset mass ratio, uniformly mixing to obtain a dry material, adding the rosin alcohol solution according to the mass ratio into the dry material, and uniformly mixing to obtain a wet material; and (5) preparing a sample of the wet material and drying. Has the advantages that: the invention mainly ensures the expansibility, high strength and easy adhesion of similar materials and has stable mechanical properties. The raw materials of each component are easy to obtain, and the cost is lower.
The invention patent with publication number CN106153423B discloses a mudstone sample, a device and a method for remolding the mudstone sample by using rock debris, and belongs to the technical field of deep oil and gas reservoir drilling and utilization of exhausted gas reservoirs. The mudstone sample was prepared from mudstone drilling debris. The device comprises a sleeve, a bottom plate, a pressure plate and a force application mechanism. The method comprises the following steps: obtaining a mudstone drilling debris; grinding the mudstone layer drilling debris to obtain ground mudstone layer drilling debris; adding water into the ground mudstone layer drilling debris and stirring to obtain mudstone layer drilling debris which can be agglomerated by hand kneading; and (3) placing the mudstone layer drilling debris which can be agglomerated by hand into the device for press forming and taking out to obtain the mudstone sample. By mechanically evaluating the mud rock sample obtained by remodeling, the sealing performance of the abandoned well can be evaluated, and a reference is further provided for whether well repairing operation is carried out.
The prior related patents focus on the remodeling of a single mudstone rock sample, but experimental rock samples cannot be prepared in batches, and the mudstone rock samples after batch remodeling cannot highly reduce the mechanical property of the carbon mudstone on site.
Disclosure of Invention
In view of the above, the invention provides a preparation material for remolding coal-series mudstone samples and a batch preparation method thereof, aiming at solving the problems that experimental rock samples cannot be prepared in batches in the remolding process of the mudstone rock samples and the mudstone rock samples after being remolded in batches cannot highly reduce the mechanical property of the carbonaceous mudstone on site.
In order to achieve the aim, the invention provides a preparation material for remolding coal-series mud rock samples, which comprises the following components: the coal powder comprises coal powder, bentonite, clay, quartz sand, cement and water, wherein the mass ratio of each component is as follows: the coal powder accounts for 5-15% of the total material, the bentonite accounts for 10-20% of the total material, the clay accounts for 5-10% of the total material, the quartz sand accounts for 30-40% of the total material, the cement accounts for 5-15% of the total material, and the balance is water.
Further, the bentonite is one or two of calcium bentonite or sodium bentonite.
Furthermore, the particle size of the ground coal powder is less than 0.5mm, the particle size of the calcium bentonite or the sodium bentonite is less than 0.5mm, and the particle size of the screened quartz sand is less than 0.5 mm.
Further, the montmorillonite content of the calcium bentonite or the sodium bentonite reaches more than 85 percent.
A batch preparation method of remolded coal series shale samples comprises the following steps:
s1, collecting rock samples on site, and determining main mechanical parameters (uniaxial compressive strength and axial expansion strain) and mineral components of the coal-series mudstone rock samples on site at normal temperature (25 ℃);
s2, selecting coal, bentonite, clay, quartz sand, cement and water as raw materials to grind, preparing rock samples for coal-series mudstone testing according to mineral components and strength of rock samples collected on site and grouping and proportioning according to different experiments, and properly increasing the ratio of the quartz sand to the cement if uniaxial compressive strength of the rock samples collected on site is higher; if the water absorption expansion deformation of the field collected rock sample is larger, the ratio of bentonite to clay is properly increased;
s3, preparing a testing coal series mud rock sample by a special plastic drying grinding tool and drying and preparing the sample;
s4, carrying out rock mechanics experiments (25 ℃) on the tested mudstone rock samples of each group at normal temperature, and measuring uniaxial compressive strength and axial expansion strain of the mudstone rock samples;
s5, selecting a group of test rock samples and field rock samples with the uniaxial compressive strength and the axial expansion strain closest to each other as a standard proportion;
s6, preparing experimental rock samples in batches by using a special plastic drying grinding tool according to a standard ratio;
and S7, grinding the experimental rock sample into standard phi 50mm multiplied by 100mm standard cylindrical test pieces by a rock grinding machine, weighing and grouping and numbering.
Further, the plastic drying grinding tool in steps S3 and S6 includes an incubator, a plurality of plastic test piece protection sleeves placed in the incubator, a plastic test piece protection cover buckled on the plastic test piece protection sleeves, and a heating pipe placed at the bottom of the incubator, and the plastic test piece protection sleeves are uniformly provided with air holes.
Further, install the temperature controller on the insulation can, moulding test piece protective sheath is assembled for two arcs of evenly seting up the bleeder vent and forms.
Further, after the raw materials of the steps S3 and S6 are placed in a plastic drying grinding tool, the mud flat is even and flat, the vibration and repeated compaction are adopted to remove the gap in the mortar, and finally the surface of the sample plate is leveled.
Further, step S5 selects the average uniaxial compressive strength of the test rock sample to be within 5% of the average uniaxial compressive strength of the field rock sample, and selects the average axial expansion strain of the test rock sample to be within 10% of the average axial expansion strain of the field rock sample.
The invention has the beneficial effects that:
1. the invention discloses a batch preparation method of remolded samples for reducing mechanical properties of coal-based mudstone, which comprises the steps of measuring uniaxial compressive strength and expansion deformation characteristics of the coal-based mudstone sample at normal temperature by field sampling, simulating water absorption characteristics and expansion deformation characteristics of the mudstone by using the characteristics of calcium-based bentonite or sodium-based bentonite in a laboratory, simulating sand components and strength of the mudstone by using the characteristics of quartz sand and cement, adding a certain amount of field coal samples, clay and purified water, obtaining remolded experimental rock samples by using a special plastic drying grinding tool according to different proportions, carrying out rock mechanical experiments, selecting one group of standard proportions with the uniaxial compressive strength and expansion deformation characteristics closest to those of field collected rock samples, and carrying out batch preparation of the experimental rock samples. The remolded rock sample obtained by the method can highly reduce the water absorption and basic mechanical properties of the on-site carbonaceous mudstone, and the material is simple and easy to obtain; meanwhile, by mechanically evaluating the remolded carbonaceous mudstone sample, a large number of homogeneous test pieces with similar field mechanical properties can be used for performing a grouping cross test by controlling single variables such as temperature, pressure, water content and the like, and the influence degree of a single factor on the coal-based carbonaceous mudstone can be quantitatively analyzed.
2. The invention discloses a batch preparation method of remolded samples with reduced coal series mudstone mechanical properties, which selects coal powder, calcium bentonite (sodium bentonite), clay, quartz sand, cement and water as raw materials, and obtains remolded samples with high consistency with the expansibility, water absorbability and basic mechanical properties of coal series carbon mudstone samples according to the proportioning test result. The experimental homogeneous rock sample is prepared in batches at a lower cost, and the rock mechanics experiment is conveniently carried out.
3. The method for preparing the remolded sample with the mechanical property of the reduced coal-series mudstone can prepare homogeneous remolded samples of the carbonaceous mudstone in batches, can highly reduce the water absorption, the expansibility and the basic mechanical property of the carbonaceous mudstone, has low manufacturing cost and obvious practicability and innovation.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a batch preparation method of remolded samples for reducing mechanical properties of coal series mudstone according to the invention;
FIG. 2 is a schematic structural diagram of a plastic drying grinding tool in the batch preparation method of the remolded sample for reducing the mechanical properties of coal series mudstone.
Reference numerals: insulation can 1, moulding test piece visor 2, test piece 3, moulding test piece protective sheath 4, heating pipe 5, temperature controller 6, iron frame 7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The batch preparation method of the remolded sample for reducing the mechanical property of the coal-series mudstone, which is shown in figure 1, comprises the following steps:
s1: collecting a group of rock samples at a coal mine site according to a coal-based carbonaceous mudstone object to be researched, grinding the rock samples into powder, measuring a full stress-strain curve, uniaxial compressive strength, elastic modulus E, Poisson ratio mu and mineral components of the rock at normal temperature according to requirements of engineering rock mass test method standard (GB/T50266-99) and coal and rock physical and mechanical property measuring method (GB/T23561.1-2009), and observing expansion deformation of the rock samples after being soaked for 12h, 24h and 36 h.
S2: coal, calcium-based bentonite or sodium-based bentonite, clay, quartz sand, cement and water are selected as raw materials to be ground, rock samples for coal-series mudstone testing are prepared according to mineral components and strength of the rock samples collected on site and different experimental grouping ratios, and if the uniaxial compressive strength of the rock samples collected on site is higher, the ratio of the quartz sand to the cement is properly increased; if the water absorption expansion deformation of the field collected rock sample is larger, the ratio of bentonite to clay is properly increased.
Wherein: the calcium bentonite or sodium bentonite has the water accumulation expansion characteristic, the montmorillonite content of the calcium bentonite or sodium bentonite is more than 85 percent, and the calcium bentonite or sodium bentonite is mainly used for simulating the water absorption characteristic and the expansion deformation characteristic of coal series mudstone; the coal and quartz sand can reduce the coal and sand contained in the mudstone; the cement mainly plays roles in shaping and hardness strengthening. The quartz sand is selected according to the standard regulation of building sand in GB/T14684-2001, and fine sand (Mf is 2.2-1.6) is mainly used for shaping and simulating the sandy components in coal-series mudstone; the cement is selected according to the general portland cement (GB175-2007) regulations, and the strength grades of P.O 42.5.5 and P.S 32.5.5/42.5 can be selected, so that the functions of shaping and hardness strengthening are mainly achieved; purified water is used for water separation.
Preparing according to different proportioning schemes in groups and recording.
S3: the test rock sample is prepared and dried to prepare the sample by the special molding drying grinding tool as shown in fig. 2, the molding drying grinding tool comprises an insulation box 1, six groups of molding test piece protective sleeves 4 arranged in the insulation box, a molding test piece protective cover 2 buckled on the corresponding molding test piece protective sleeves, and a heating pipe 5 arranged at the bottom of the insulation box, and a temperature controller 6 used for monitoring the temperature change in the insulation box is further arranged on the insulation box. Moulding test piece protective sheath is assembled for two arcs of evenly seting up the bleeder vent and forms, makes things convenient for moulding and processing.
Firstly fixing one end of two assembled arc plates through a shaping test piece protective cover, then uniformly stirring coal, calcium bentonite, quartz sand, cement and water according to a certain proportion according to a proportioning scheme, injecting the mixture into a shaping test piece protective sleeve as a test piece 3 to enable mud flat to be uniform and smooth, removing gaps in mortar by adopting vibration and repeated compaction, removing the gaps through manual feeding and pressurization for multiple times, sealing and reinforcing the shaping test piece protective sleeve 4 through the shaping test piece protective cover 2, and naturally air-drying the shaping test piece protective sleeve in a heat preservation box. After one week, the test rock sample is taken out through a sealed iron frame 7 and polished into a standard cylinder test piece with the standard diameter of 50mm multiplied by 100mm for testing. The moulding stoving grinding apparatus has the temperature control function, guarantees that ambient temperature is controllable. The size of the shaping test piece is phi 60mm multiplied by 110mm, which is slightly larger than the size of the standard test piece, and the shaping test piece is convenient for polishing and processing.
S4, carrying out rock mechanics experiments (25 ℃) on the tested mudstone rock samples of each group at normal temperature, and measuring uniaxial compressive strength and axial expansion strain of the mudstone rock samples;
s5, selecting a group of standard proportions with the test rock sample and the field rock sample having the closest uniaxial compressive strength and axial expansion strain, selecting the test rock sample having the uniaxial compressive strength average value not more than 5% different from the field rock sample uniaxial compressive strength average value, selecting the test rock sample having the axial expansion strain average value not more than 10% different from the field rock sample axial expansion strain average value;
s6, preparing experimental rock samples in batches by using the special plastic drying grinding tool according to the standard proportion (repeating the step S3);
and S7, grinding the experimental rock sample into standard phi 50mm multiplied by 100mm standard cylindrical test pieces by a rock grinding machine, weighing and grouping and numbering.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (9)
1. The preparation material for remolding the coal-series mud rock sample is characterized by comprising the following components: the coal powder comprises coal powder, bentonite, clay, quartz sand, cement and water, wherein the mass ratio of each component is as follows: the coal powder accounts for 5-15% of the total material, the bentonite accounts for 10-20% of the total material, the clay accounts for 5-10% of the total material, the quartz sand accounts for 30-40% of the total material, the cement accounts for 5-15% of the total material, and the balance is water.
2. The preparation material for remolding coal-series mud rock samples according to claim 1, wherein the bentonite is one or both of calcium bentonite and sodium bentonite.
3. A material for producing a reformed coal-based mud rock sample according to claim 2, wherein the pulverized coal has a particle size of less than 0.5mm after grinding, the calcium-based bentonite or the sodium-based bentonite has a particle size of less than 0.5mm, and the screened silica sand has a particle size of less than 0.5 mm.
4. A material for producing a reformed coal-based shale sample according to claim 2, wherein: the montmorillonite content of the calcium bentonite or the sodium bentonite reaches more than 85 percent.
5. A batch preparation method of remolded coal series shale samples is characterized by comprising the following steps:
s1, collecting rock samples on site, and determining main mechanical parameters (uniaxial compressive strength and axial expansion strain) and mineral components of the coal-series mudstone rock samples on site at normal temperature (25 ℃);
s2, selecting coal, bentonite, clay, quartz sand, cement and water as raw materials to grind, and preparing the rock sample for the coal-series mudstone test according to different experimental grouping ratios according to the mineral components and strength of the rock sample collected on site;
s3, preparing a testing coal series mud rock sample by a special plastic drying grinding tool and drying and preparing the sample;
s4, carrying out rock mechanics experiments (25 ℃) on the tested mudstone rock samples of each group at normal temperature, and measuring uniaxial compressive strength and axial expansion strain of the mudstone rock samples;
s5, selecting a group of test rock samples and field rock samples with the uniaxial compressive strength and the axial expansion strain closest to each other as a standard proportion;
s6, preparing experimental rock samples in batches by using a special plastic drying grinding tool according to a standard ratio;
and S7, grinding the experimental rock sample into standard phi 50mm multiplied by 100mm standard cylindrical test pieces by a rock grinding machine, weighing and grouping and numbering.
6. The batch preparation method of a preparation material for remolding coal-series mud rock samples as claimed in claim 5, wherein the plastic drying grinding tool in steps S3 and S6 comprises an incubator, a plurality of plastic test piece protecting sleeves placed in the incubator, a plastic test piece protecting cover buckled on the plastic test piece protecting sleeves, and a heating pipe placed at the bottom of the incubator, wherein the plastic test piece protecting sleeves are uniformly provided with air holes.
7. The batch preparation method of remolded coal-based shale samples as claimed in claim 6, wherein the temperature controller is installed on the thermal insulation box, and the shaping test piece protective sleeve is formed by assembling two arc plates uniformly provided with air holes.
8. The method of claim 7, wherein the raw materials of steps S3 and S6 are placed in a plastic drying grinding tool, the mudflat is leveled, the vibration and repeated compaction are adopted to remove the gap in the mortar, and finally the surface of the sample plate is leveled.
9. The batch preparation method of remolded coal-based shale samples as claimed in claim 8, wherein step S5 selects the average uniaxial compressive strength of the test rock sample not to differ by more than 5% from the average uniaxial compressive strength of the on-site rock sample, and selects the average axial expansion strain of the test rock sample not to differ by more than 10% from the average axial expansion strain of the on-site rock sample.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010705550.9A CN111812300A (en) | 2020-07-21 | 2020-07-21 | Preparation material for remolding coal series mud rock sample and batch preparation method thereof |
| CN202011085688.XA CN112051389B (en) | 2020-07-21 | 2020-10-12 | Preparation material for remolding coal series mud rock sample and batch preparation method thereof |
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| CN202010705550.9A CN111812300A (en) | 2020-07-21 | 2020-07-21 | Preparation material for remolding coal series mud rock sample and batch preparation method thereof |
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| CN111812300A true CN111812300A (en) | 2020-10-23 |
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| CN113916886B (en) * | 2021-10-11 | 2023-06-23 | 合肥工业大学 | Mudstone remolding method based on microscopic morphology image analysis |
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