CN107271235B - Preparation method of rock and mortar combined sample based on rock-mortar interface gas permeation test - Google Patents
Preparation method of rock and mortar combined sample based on rock-mortar interface gas permeation test Download PDFInfo
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- CN107271235B CN107271235B CN201710496161.8A CN201710496161A CN107271235B CN 107271235 B CN107271235 B CN 107271235B CN 201710496161 A CN201710496161 A CN 201710496161A CN 107271235 B CN107271235 B CN 107271235B
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Abstract
The invention discloses a preparation method of a rock and mortar combined sample based on a rock-mortar interface gas permeation test, which comprises the following steps of firstly cutting and drilling a core in a granite rock body to obtain a Brazilian disc cylinder sample; secondly, coring the Brazilian disc cylinder sample for the second time to obtain a hollow sample; carrying out roughness treatment on the inner wall of the cored hollow sample; designing the mixing proportion of cement mortar according to the design requirement, mixing the mortar, then pouring the mortar on a middle round hole of the hollow sample, and obtaining a rock and mortar combined sample after curing and demoulding; and the rock and mortar combined sample is maintained in water to be used for experimental research. The method can be used for researching the gas permeability of the rock and mortar interface, can well combine actual engineering geological conditions, simulates the optimal interface state, and has important scientific value and practical significance for improving the safety of surrounding rock and concrete barrier structures and sustainable development of energy in China.
Description
Technical Field
The invention relates to a rock sample manufacturing method, in particular to a rock and mortar combined sample manufacturing method based on a rock-mortar interface gas permeation test.
Background
The currently feasible solution for disposing high level radioactive waste is deep geological disposal, and usually adopts a design of multiple barrier system to permanently isolate the radioactive waste from the external environment. The engineering barrier comprises a backfill material, a cement filling material and a roadway concrete lining, and the natural barrier refers to a main rock of the nuclear waste disposal reservoir.
China currently uses the granite of the northern mountain in Gansu province as a candidate main rock. Due to decay and heat release of radioactive materials, excavation and construction of underground disposal sites, and existence of underground water, the research on the safety of underground disposal of radioactive wastes must consider various different working conditions. Concrete used as an engineering barrier can be degraded and decomposed over a long time to generate high-alkalinity solute, and the high-alkalinity solute is contacted with underground water to form high-alkalinity pore water. At the interface of concrete and granite, the silicon dioxide in the granite is dissolved in a high-alkaline environment in an accelerated manner, so that the local mineral components of the surrounding rock are damaged, and the protective effect of a natural barrier is weakened. The nuclear waste can emit heat in the disposal process and is used as a granite and concrete barrier under the action of higher stress, microcracks and an area crushing process caused by the excavation of a high-level waste disposal warehouse and the occurrence of rock permeability, crack opening and concrete thermal cracks caused by the microcracks and the crack opening, and gas passing through the engineering barrier finally passes through the granite geological barrier and leaks.
Aiming at the safety problem of the nuclear waste geological disposal surrounding rock and concrete barrier structure, the method can not be directly researched, can be used for researching respective multi-field coupling action of granite cracks and concrete media by manufacturing and simulating the most real interface state, can also be used for experimental research on physical, mechanical, chemical and permeability coupling action of a contact interface of concrete and granite, and has important scientific value and practical significance for improving the safety of the surrounding rock and concrete barrier structure and sustainable development of energy in China.
Disclosure of Invention
The invention aims to research the gas permeability characteristic of a rock and mortar interface so as to be used in the engineering background, and provides a special sample which can be used for permeability research under different confining pressure, osmotic pressure, temperature, humidity and pH value conditions, and the special sample is an experimental sample which is more comprehensive and better simulates the actual engineering environment.
The content of the invention is as follows: a preparation method of a rock and mortar combined sample based on a rock-mortar interface gas permeation test is realized by the following technical measures: step 1, preparing an initial rock sample; step 2, performing secondary coring on the rock to obtain a hollow special rock sample; step 3, carrying out roughness treatment on the inner wall of the cored sample; step 4, designing the mixing proportion of cement mortar, and mixing the mortar; step 5, pouring mortar; and 6, maintaining the sample, and maintaining the whole sample in water for a sufficient time to enable the sample to be in a stable state.
In order to solve the technical problems, the invention adopts the technical scheme that:
A preparation method of a rock and mortar combined sample based on a rock-mortar interface gas permeation test is characterized by comprising the following steps: the method comprises the following steps:
Firstly, preparing an initial rock sample, cutting, core drilling and grinding a granite rock body to obtain a Brazilian disc cylinder sample;
Secondly, secondary core drilling is carried out, wherein secondary core drilling is carried out on the cylindrical sample of the Brazilian disc to obtain a hollow sample with a round hole in the middle;
Step three, performing surface treatment on the inner wall of the hollow sample subjected to secondary coring to make the surface roughness of the inner wall of the hollow sample uniform and simulate real interface characteristics;
Step four, mixing the cement mortar according to the design requirement, and uniformly stirring;
Placing hard plastic cloth at the bottom of the hollow sample after surface treatment of the inner wall, fixing the hard plastic cloth with an adhesive tape to form a mold, pouring the cement mortar in the step four on the round hole in the middle of the hollow sample slowly and uniformly, preventing the mortar on the upper surface and the lower surface of the hollow sample from overflowing, trowelling the outer surface of the hollow sample after pouring is finished, covering and fixing a layer of hard plastic film on the upper surface, and hardening and removing the mold to obtain the rock and mortar combined sample.
And as an improvement, after the rock and mortar combined sample is obtained in the fifth step, maintaining the rock and mortar combined sample in water to ensure the overall stability of the rock and mortar combined sample, wherein the maintaining time is 3-6 months.
Preferably, in the second step, the second coring is performed on the cylindrical sample of the Brazilian disc by adopting a water cutting method, wherein the water cutting method adopts a water knife of a numerical control machine tool, and the water used by the water knife is mixed with emery to be pressurized to be more than 360MPa for cutting, so that the concentricity deviation of the inner circle and the outer circle of the hollow sample is not more than 1 mm.
Preferably, in the third step, the surface treatment of the inner wall of the hollow sample after the secondary coring comprises polishing, notching and sand blasting in sequence.
Preferably, the inner wall of the hollow sample is processed by adopting a manual polishing method, a spherical manual polisher is used, the curvature radius of the spherical manual polisher is 3mm smaller than that of the inner wall of the hollow sample after secondary coring, the roughness of the inner wall of each sample is ensured to be the same or similar, and a roughness detector is adopted to screen and eliminate the hollow sample with too large roughness difference if necessary.
Preferably, in the fourth step, the mixing ratio of the cement, the sand and the water in the cement mortar is 0.8-1.2:2.5-3.5: 0.4-0.8.
Preferably, the equipment used to prepare the Brazilian disc cylinder sample is a rock cutter model JKCB-300 rock cutter, a secondary coring drill model YN30E rock drill, and an SCM-200 rock double-end face miller is used to polish the inner wall of the hollow sample.
The invention has the beneficial effects that:
The rock and mortar combined sample prepared by the method can be used for researching the gas permeability characteristic of the rock and mortar interface, and can well combine the actual engineering geological conditions to simulate the optimal interface state. In addition, the rock and mortar combined sample prepared by the invention can also be suitable for the research on the gas permeability characteristic of the rock-mortar interface under the action of different conditions such as different ambient pressure, osmotic pressure, temperature, humidity and the like, and has important scientific value and practical significance for improving the safety of the surrounding rock and concrete barrier structure and the sustainable development of energy in China.
Drawings
FIG. 1 is a flow chart of a preparation method of a rock and mortar combined sample.
FIG. 2 is a schematic representation of a hollow core sample after a secondary coring.
Fig. 3 is a top view of a rock and mortar combination test specimen.
1-hollow sample, 2-cement mortar, 3-rock-mortar interface.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and a preferred embodiment thereof.
A preparation method of a rock and mortar combined sample based on a rock-mortar interface gas permeation test comprises the following steps:
Step one, initial rock sample preparation, selected from the granite of the northern mountain in Gansu province, belonging to the sesame white series, and the mineral component of which mainly comprises albite (NaAlSi) 3O8) Potassium feldspar (KAlSi) 3O8) Quartz (SiO) 2) Cutting, drilling, grinding and flattening granite rock blocks to obtain Brazilian disc cylinder samples of 50mmx25mm for the conventional penetration test, storing the samples at normal temperature, and keeping the samples clean and dry;
And secondly, secondary core drilling is carried out on the Brazilian disc cylinder sample to obtain a hollow sample 1 with a round hole in the middle, secondary core drilling is carried out on the Brazilian disc cylinder sample by adopting a water cutting method, the water cutting method adopts a water knife of a numerical control machine, the model of a water cutting machine is ZX50C, the water cutting process is controlled by the numerical control machine, the cutting precision can reach 0.5mm, water is mixed with emery and pressurized to more than 360MPa, the emery is sprayed out from a nozzle of 0.8mm for cutting, data is input into a computer, the cutting process is digitally controlled, the efficiency is improved, and the sample preparation period is shortened. Thus obtaining a hollow sample 1 with the inner and outer circle concentricity error not more than 1mm, carrying out preferential screening on the hollow sample 1, eliminating the sample with overlarge concentric deviation, and optimally selecting the hollow sample 1 with the inner and outer circle concentricity error not more than 0.5 mm;
Performing surface treatment on the inner wall of the hollow sample 1 subjected to secondary coring, wherein the surface treatment on the inner wall of the hollow sample 1 subjected to secondary coring comprises polishing, notching and sand blasting in sequence; the roughness of the inner wall surface of the hollow sample 1 is uniform, and the real interface characteristics are simulated; the inner wall of the hollow sample 1 is processed by adopting a manual polishing method, a spherical manual polisher is used, the curvature radius of the spherical manual polisher is 3mm smaller than that of the inner wall of the hollow sample 1 after secondary coring, the roughness of the inner wall of each sample is the same or similar, a roughness detector is adopted to screen and eliminate the hollow sample 1 with overlarge roughness difference if necessary, the roughness of the contact surface can influence the bonding degree of a rock and mortar interface, and further influence the stability of the interface, in order to reduce errors, the samples are all subjected to roughness processing with the same degree, the consistency of the roughness is kept as much as possible on the premise of not influencing the stability, and a roughness detector can be adopted to screen if necessary.
Step four, mixing the cement mortar 2 according to the design requirements, and uniformly stirring, wherein the mixing ratio of cement, sand and water in the cement mortar 2 is 0.8-1.2:2.5-3.5:0.4-0.8, and the optimal ratio is 1: 3: 0.6, i.e. 1 weight cement and 3 weight sand and 0.6 weight water; in this example, the design of the mix proportion of cement mortar 2 was carried out, the cement was a p.o 42.5 grade ordinary portland cement and a p.o 32.5 grade portland cement, the sample-making sand was selected from river sand of the Yangtze river in Wuhan, the fineness modulus was 2.3, which belongs to medium sand, the mix proportion was 1: 3: 0.6, namely 1 weight of cement, 3 weight of sand and 0.6 weight of water, the dosage of the selected cement and sand is determined by calculation, the water consumption is properly increased according to the test mixing condition, and the mixture is uniformly mixed. Considering that the mortar matching ratio has great influence on the interface stability, the consumption of related aggregate is strictly calculated according to the specification in the process;
Placing hard plastic cloth at the bottom of the hollow sample 1 after the inner wall is subjected to surface treatment, fixing the plastic cloth with an adhesive tape to form a mold, taking the hollow sample 1 as the mold, pouring the round hole in the middle of the hollow sample 1 with the cement mortar 2 in the fourth step, slowly and uniformly pouring by using a funnel during pouring, preventing the mortar on the upper surface and the lower surface of the hollow sample 1 from overflowing, flattening the outer surface of the hollow sample 1 after pouring is finished, and wiping to keep the uniform distribution of the mortar on the interface. And covering and fixing a layer of hard plastic film on the upper surface, and hardening and removing the mould 24 hours after the mortar is poured to obtain the rock and mortar combined sample.
And D, after the rock and mortar combined sample is obtained in the fifth step, maintaining the rock and mortar combined sample in water, pouring water with enough volume into a bucket, completely submerging the whole poured hollow sample 1 in the water, and maintaining the hollow sample in the water for 3 months to enable the interface to be in a stable state, wherein the maintenance time is determined by experimental experience to be not less than 3 months.
The method can be used for researching the gas permeability of the rock and mortar interface, and can be well combined with actual engineering geological conditions to simulate the optimal interface state in a later test.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the method of the present invention in any way. Any simple modification, equivalent change and modification, and change of the used materials to the above embodiments according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (5)
1. A preparation method of a rock and mortar combined sample based on a rock-mortar interface gas permeation test is characterized by comprising the following steps: the method comprises the following steps:
Firstly, preparing an initial rock sample, cutting, core drilling and grinding a granite rock body to obtain a Brazilian disc cylinder sample;
Secondly, secondary core drilling is carried out, wherein secondary core drilling is carried out on the cylindrical sample of the Brazilian disc to obtain a hollow sample with a round hole in the middle;
Performing surface treatment on the inner wall of the hollow sample subjected to secondary coring, wherein the surface treatment comprises polishing, notching and sand blasting treatment in sequence, so that the surface roughness of the inner wall of the hollow sample is uniform, and the real interface characteristics are simulated;
Step four, mixing the cement mortar according to the design requirement, and uniformly stirring;
Placing hard plastic cloth at the bottom of the hollow sample after surface treatment is carried out on the inner wall, fixing the hard plastic cloth by using an adhesive tape to form a mold, pouring the cement mortar in the step four on the round hole in the middle of the hollow sample slowly and uniformly, preventing the mortar on the upper surface and the lower surface of the hollow sample from overflowing, trowelling the outer surface of the hollow sample after pouring is finished, covering and fixing a layer of hard plastic film on the upper surface, and hardening and removing the mold to obtain a rock and mortar combined sample;
And D, after the rock and mortar combined sample is obtained in the fifth step, maintaining the rock and mortar combined sample in water to ensure the overall stability of the rock and mortar combined sample, wherein the maintaining time is 3-6 months.
2. The preparation method of the rock and mortar combined sample based on the rock-mortar interface gas permeation test, according to claim 1, is characterized in that: and in the second step, secondary coring is carried out on the Brazilian disc cylinder sample by adopting a water cutting method, wherein the water cutting method adopts a water knife of a numerical control machine tool, and the water used by the water knife is mixed with emery sand and pressurized to be more than 360MPa for cutting, so that the concentricity deviation of the inner and outer circles of the obtained hollow sample is not more than 1 mm.
3. The preparation method of the rock and mortar combined sample based on the rock-mortar interface gas permeation test, according to claim 1, is characterized in that: the inner wall of the hollow sample is processed by adopting a manual polishing method, a spherical manual polisher is used, the curvature radius of the spherical manual polisher is 3mm smaller than that of the inner wall of the hollow sample after secondary coring, the roughness of the inner wall of each sample is ensured to be the same or similar, and a roughness detector is adopted to screen out the hollow samples with large roughness difference.
4. The preparation method of the rock and mortar combined sample based on the rock-mortar interface gas permeation test, according to claim 1, is characterized in that: in the fourth step, the mixing ratio of cement, sand and water in the cement mortar is 0.8-1.2:2.5-3.5: 0.4-0.8.
5. The preparation method of the rock and mortar combined sample based on the rock-mortar interface gas permeation test is characterized in that: the equipment used for preparing the Brazilian disc cylinder sample is a rock cutting machine with the model of JKCB-300, a secondary coring drilling machine with the model of YN30E, and an SCM-200 rock double-end-face grinding machine is adopted for polishing the inner wall of the hollow sample.
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| CN109211640B (en) * | 2018-11-07 | 2021-10-22 | 湖北工业大学 | Sample preparation method based on multi-field coupling test of fractured rock |
| CN110567755A (en) * | 2019-10-09 | 2019-12-13 | 中南大学 | Numerical control type cutting ring soil sampler and control method thereof |
| CN110987771B (en) * | 2019-10-29 | 2022-07-19 | 交通运输部公路科学研究所 | Test method for simulating interface concrete corrosion between tunnel lining structure and surrounding rock |
| CN112129614B (en) * | 2020-08-31 | 2022-10-28 | 浙江工业大学 | Environmental impact evaluation method for road backfill by using renewable solid waste material |
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| CN105758737A (en) * | 2016-04-22 | 2016-07-13 | 华北水利水电大学 | Method and device for testing shear strength of rock and concrete bond interface |
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