CN113149537B - Artificial urban solid waste preparation method capable of quantitatively controlling characteristics under supergravity condition - Google Patents

Artificial urban solid waste preparation method capable of quantitatively controlling characteristics under supergravity condition Download PDF

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CN113149537B
CN113149537B CN202110591063.9A CN202110591063A CN113149537B CN 113149537 B CN113149537 B CN 113149537B CN 202110591063 A CN202110591063 A CN 202110591063A CN 113149537 B CN113149537 B CN 113149537B
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solid waste
kaolin
quartz sand
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CN113149537A (en
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李俊超
孟嘉
陈云敏
朱斌
闫子桩
李金龙
王剑
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Zhejiang University ZJU
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    • C—CHEMISTRY; METALLURGY
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
    • C—CHEMISTRY; METALLURGY
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
    • C—CHEMISTRY; METALLURGY
    • 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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    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • C04B2111/00775—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes the composition being used as waste barriers or the like, e.g. compositions used for waste disposal purposes only, but not containing the waste itself
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
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Abstract

The invention discloses a preparation method of artificial urban solid wastes with quantitatively controllable characteristics under a supergravity condition. The preparation method comprises the following steps of taking grass peat, kaolin and quartz sand as raw materials, and keeping the mass ratio of the kaolin to the quartz sand as kaolin: 1:4 of quartz sand; the proportion of each raw material is determined by calculation and weighed, so that the organic matter tendon phase content, the pore ratio and the water content of the artificial urban solid waste are consistent with those of real solid waste; spreading kaolin on quartz sand, mixing to obtain mixture, grinding grass carbon to obtain agglomerate, spreading the mixture of quartz sand and kaolin on grass carbon, mixing, and adding water to adjust water content. The artificial urban solid waste prepared by the method can realize quantitative control of various characteristics of materials and excellent simulation of relevant characteristics of real solid waste, and has important significance for researching relevant problems of a refuse landfill under the condition of supergravity.

Description

Artificial urban solid waste preparation method with characteristics capable of being quantitatively controlled under supergravity condition
Technical Field
The invention relates to a preparation and allocation method of artificial urban solid waste, in particular to a preparation method of artificial urban solid waste, which can be applied to quantitative control and adjustment of various characteristics under the condition of supergravity.
Background
For decades, China always uses landfill as the most main solid waste disposal means, and derives a plurality of large landfill sites with nearly saturated capacity. The characteristics of high content of solid waste kitchen waste, easy silting of a drainage system and the like in China cause the common water level of a landfill to be high, and unstable slippage disasters are easy to occur under the extreme external action, so that a large amount of leachate and solid waste are leaked, and further the large-scale, long-distance and high-speed slippage disasters can be evolved. Therefore, the research on the stability of the landfill site has important significance in relation to the safety of life and property of surrounding residents and the protection of the earth surface environment. The research on the stress-strain characteristics of solid wastes is one of the key points, although scholars at home and abroad have already studied a lot of research on the characteristics, such as complex solid waste components, high organic matter content and the like, hinder people from deeply knowing the mechanical characteristics and the strength development mechanism of the solid wastes, and research results of the solid wastes often have greater discreteness, so that the stability, particularly the dynamic stability of a refuse landfill is difficult to accurately determine.
The supergravity model test is used as an effective means for researching the stability of the landfill, has unique advantages in the aspect of researching the stability of the landfill under extreme conditions, and because real solid wastes are complex in components, large in particle size and strong in heterogeneity, and are not suitable for being directly used in the supergravity model test, people often select model solid wastes with characteristics similar to real solid wastes as test materials. The matching degree of the test material and various characteristics of real solid wastes is directly related to the accuracy of landfill stability hypergravity model test research, so that how to select or prepare a proper test material is very important.
Due to good strain hardening characteristics, humus soil such as grass peat and the like is often used as an important material for preparing model solid wastes, such as Thusanthan and the like, Chen and the like, Goden and the like, Deng scholar and the like, Yangchunbao and the like, grass peat and materials such as quartz sand, kaolin and the like in different proportions are mixed to prepare model solid wastes, and characteristics such as solid waste volume weight, permeability, compressibility, stress-strain curve and the like are successfully simulated. However, due to neglecting the degradability of the turf and the difference of organic matter tendon phase content among different turf, people lack quantitative standards for the preparation of model solid wastes, and the repeatability of tests in different batches is poor.
Therefore, the existing material preparation method is difficult to meet the relevant test requirements.
Disclosure of Invention
In order to solve the problems existing in the background art, the invention aims to provide a preparation method of artificial urban solid waste, which can quantitatively control various characteristics under the condition of supergravity, and also provides an adjustment and blending method of artificial urban solid waste, wherein various characteristics, particularly strain hardening characteristics, of a material can be controlled by controlling the content of an organic tendon phase.
The technical scheme adopted by the invention is as follows:
the utility model provides a characteristic can quantitative control's artifical city solid waste under hypergravity condition:
the preparation method comprises the following steps of taking grass peat, kaolin and quartz sand as raw materials, and keeping the mass ratio of the kaolin to the quartz sand as kaolin: quartz sand 1: 4.
The turf content is prepared according to the organic muscle phase content, and the kaolin: quartz sand: and (4) adding grass peat into the mixture in a ratio of 1:4: N. The content of organic matter tendon phase in the artificial city solid waste is controlled by controlling the adding amount of the turf.
The proportioning unit in the invention is dry basis mass.
The preparation method of the artificial urban solid waste comprises the following steps:
1) determining the proportion of each raw material and weighing:
1.1) measuring and determining the content, the porosity ratio and the water content of the organic matter tendon phase of real solid waste;
1.2) drying kaolin, quartz sand and turf; measuring the organic matter tendon phase content of the turf;
1.4) calculating the preparation proportion of the artificial urban solid waste material according to the pore ratio of the turf and the organic matter tendon phase content balance weight, so that the parameters of the organic matter tendon phase content, the pore ratio and the water content of the artificial urban solid waste are consistent with those of real solid waste, and weighing according to the calculation result, wherein the calculation equation is as follows;
Figure BDA0003089579910000021
wherein e is the porosity ratio of the artificial city solid waste sample to be prepared, V is the volume of the artificial city solid waste sample to be prepared, and Ds-kIs the specific gravity of kaolin, Ds-sIs the specific gravity of quartz sand, Ds-pThe specific gravity of the turf is shown, N is the content of organic tendon phase in the artificial urban solid waste to be prepared, N is the content of organic tendon phase in the turf, and w is the water content in the artificial urban solid waste to be prepared, which are known quantities; m issMass of quartz sand required for the preparation of the test specimens, mkMass of kaolin required to prepare the test specimens, mpMass of peat required for sample preparation, mwThe mass of water required to prepare the sample, these being the quantities that need to be solved;
2) uniformly mixing the raw materials and adjusting the water content:
2.1) uniformly spreading kaolin on quartz sand, and fully mixing to obtain a mixture;
2.2) grinding the caking parts in the turf, uniformly spreading a mixture of quartz sand and kaolin on the turf, and fully mixing;
2.3) adding water to adjust the water content, so that the water content of the artificial urban solid waste is consistent with that of the real solid waste.
Therefore, the invention controls various properties of the material, particularly the control and adjustment of the strain hardening property by controlling the content of the organic tendon phase.
The artificial urban solid waste prepared by the method can simulate various characteristics of real solid waste, and can be used in indoor tests and hypergravity model tests instead of real solid waste, so that the problems that the real solid waste has limited sources and cannot be used in industrial tests are solved. The real solid waste refers to municipal solid waste obtained from domestic waste and daily-life refuse landfill, and the municipal solid waste cannot be used in the test of the building engineering.
The turf used in the invention is a byproduct of the marsh development process, is generated by incomplete decomposition of marsh plants under the conditions of sufficient water and no air, contains rich organic matter tendon phase, and plays a leading role in strain hardening characteristics of the artificial city solid wastes.
The kaolin used in the invention has good plasticity and cohesiveness, the average particle size (D50) and the specific gravity (Ds) are respectively 0.012mm and 2.68, the increase of the kaolin can cause the peak values of the failure strain and the partial stress to be obviously reduced, and the kaolin mainly plays a role in adjusting the failure stress and the strain.
The quartz sand uses Chinese Fujian standard sand and has an average particle size (D)50) Is 0.17mm, specific gravity (D)s) 2.622, maximum void ratio of 0.952, minimum void ratio of 0.607, and critical internal friction angle of 35 °. The quartz sand has the function of improving the solid waste strength of the artificial city to a certain extent.
The invention has the advantages of simple raw materials, low price and convenient preparation, and the prepared artificial urban solid wastes have good applicability under the condition of supergravity.
Compared with the prior art, the invention has the beneficial effects that:
1. the artificial urban solid waste prepared by the method can control various characteristics, particularly the strain hardening characteristic, of the material by controlling the content of the organic matter tendon phase, and various characteristics of the prepared artificial urban solid waste are matched with real solid waste.
2. The invention ensures that the preparation has good repeatability by establishing the quantitative control standard of the artificial urban solid wastes.
3. The artificial urban solid waste prepared by the method has good applicability under the condition of supergravity.
In a comprehensive way, the artificial urban solid waste prepared by the method can realize quantitative control on various characteristics of materials and excellent simulation on relevant characteristics of real solid waste, and has important significance for researching relevant problems of refuse landfill under the condition of supergravity.
Drawings
FIG. 1 is a schematic diagram of the preparation process of the present invention.
Fig. 2 is a graph comparing stress-strain characteristics of fresh artificial urban solid waste and real solid waste of qizi mountain of suzhou in example one.
Fig. 3 is a graph comparing stress-strain characteristics of partially degraded artificial municipal solid waste with real solid waste of qizi mountain, su, in example two.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
The examples of the invention are as follows:
the first embodiment is as follows: preparing artificial urban solid waste by taking fresh solid waste of Qizi mountain of Suzhou as prototype
As shown in figure 1 of the drawings, in which,
1. determining the proportion of each raw material and weighing:
(1) the analysis results of the solid waste components of the qizi shan mountain are shown in table 1, the organic matter tendon phase content of the fibers such as kitchen waste, paper, wood, textile, leather and the like is about 50-70%, the organic matter tendon phase content of the plastic is 100%, and the rest materials do not contain the organic matter tendon phase, so that the organic matter tendon phase content of the fresh solid waste of the qizi mountain is about 40-50%, and can be considered to be about 45%.
TABLE 1 Suzhou Qizi mountain real solid waste physical composition
Figure BDA0003089579910000041
(2) Drying the kaolin, the quartz sand and the grass peat, and simultaneously measuring that the content of an organic tendon phase A of the grass peat is 93.3%;
(3) the results of calculating the preparation proportion of each material are shown in table 2, so that the parameters of the artificial city solid waste organic matter tendon phase content, the pore ratio, the water content and the like are consistent with those of real solid waste, and the materials are weighed.
TABLE 2 calculation results of artificial city solid waste allocation ratio
Figure BDA0003089579910000042
2. Uniformly mixing the materials and adjusting the water content:
(1) spreading kaolin on quartz sand uniformly, and mixing thoroughly;
(2) grinding the caking parts in the turf, uniformly spreading a mixture of quartz sand and kaolin on the turf, and fully mixing;
(3) water was added to adjust the final material moisture content.
A series of tests were conducted on the prepared artificial urban solid wastes to test each basic characteristic thereof, as shown in tables 3 and 4.
TABLE 3 comparison of basic physical Properties
Figure BDA0003089579910000051
TABLE 4 comparison of Strength parameters
Figure BDA0003089579910000052
As can be seen in the above table: the artificial urban solid waste prepared by the method can control various characteristics of the material by controlling the content of the organic matter tendon phase, and the basic physical characteristics of the material, such as water content, volume weight, porosity ratio, compression coefficient, permeability coefficient, strength parameter and the like, are similar to the measured data of the solid waste of the Suzhou Qizi mountain landfill.
As shown in fig. 2, the stress-strain curve of the artificial urban solid waste prepared by the method is very consistent with the real solid waste of the qizi mountain of suzhou, and shows obvious strain hardening characteristics, which indicates that the two have higher matching degree in terms of mechanical characteristics.
In conclusion, the artificial urban solid waste prepared by the method can control various characteristics, particularly the strain hardening characteristic, of the material by controlling the content of the organic matter tendon phase, and various characteristics of the prepared artificial urban solid waste are matched with real solid waste.
The applicability of the artificial urban solid wastes prepared by the method under the condition of hypergravity is explored. Referring to the supergravity centrifugal simulation test performed by Chen and the like, the material used in the centrifugal test is very close to various characteristics of real solid wastes of the Qizi mountain Suzhou, a slope model is established by using Geoslope based on the prototype size, the calculated critical water level ratio is compared with the critical water level ratio obtained in the centrifugal test, and the result is shown in table 5.
TABLE 5 Critical water level ratio comparison
Figure BDA0003089579910000053
Figure BDA0003089579910000061
From table 5, the critical water level ratio corresponding to the artificial urban solid waste prepared by the method is very close to that obtained by a centrifugal machine simulation test and real solid waste calculation. When the breaking strain is taken to be 20%, the calculated critical water level ratio is in good agreement with the centrifugal test result.
The method proves that the artificial urban solid waste prepared by the method has good applicability under the condition of supergravity.
Example two: preparing artificial urban solid waste by taking degraded solid waste of Qizi mountain of Suzhou as prototype
1. Determining the proportion of each raw material and weighing:
(1) the analysis results of the solid waste components of the qizi shan mountain are shown in table 6, the organic matter tendon phase content of the fibers such as kitchen waste, paper, wood, textile, leather and the like is about 50% -70%, the organic matter tendon phase content of the plastic is 100%, and the rest materials do not contain the organic matter tendon phase, so that the solid waste organic matter tendon phase content of the degradation part of the qizi mountain is about 30% -40%, and can be considered to be about 35%.
TABLE 6 actual solid waste physical composition of Qizishan Suzhou
Figure BDA0003089579910000062
(2) Weighing kaolin and quartz sand according to the mass ratio of 1:4, drying the kaolin, the quartz sand and grass peat, wherein the content of an organic tendon phase A of the grass peat is 93.3%; the content of the grass carbon B organic matter tendon phase is 51.5%.
(3) The results of calculating the preparation proportion of each material are shown in table 7, so that the parameters of the artificial city solid waste organic matter tendon phase content, the pore ratio, the water content and the like are consistent with those of real solid waste, and the materials are weighed.
TABLE 7 calculation results of artificial city solid waste configuration ratio
Figure BDA0003089579910000063
2. Uniformly mixing the materials and adjusting the water content:
(1) spreading kaolin on quartz sand uniformly, and mixing thoroughly;
(2) grinding the caking parts in the turf, uniformly spreading a mixture of quartz sand and kaolin on the turf, and fully mixing;
(3) water was added to adjust the final material moisture content.
A series of tests were conducted on the artificial urban solid waste prepared from the turf a to test each basic characteristic thereof, as shown in tables 8 and 9.
TABLE 8 comparison of basic physical Properties
Figure BDA0003089579910000071
TABLE 9 comparison of Strength parameters
Figure BDA0003089579910000072
As can be seen from the above table: the artificial urban solid waste prepared by the method can control various characteristics of the material by controlling the content of the organic matter tendon phase, and the basic physical characteristics of the material, such as water content, volume weight, porosity ratio, compression coefficient, permeability coefficient, strength parameter and the like, are similar to the measured data of the solid waste of the Suzhou Qizi mountain landfill. As shown in fig. 2, the stress-strain curve of the artificial urban solid waste prepared by the method is very consistent with the real solid waste of the qizi mountain of suzhou, and shows obvious strain hardening characteristics, which indicates that the two have higher matching degree in terms of mechanical characteristics.
In conclusion, the artificial urban solid waste prepared by the method can control various characteristics, particularly the strain hardening characteristic, of the material by controlling the content of the organic matter tendon phase, and various characteristics of the prepared artificial urban solid waste are matched with real solid waste.
As shown in fig. 3, compared with the artificial urban solid waste of the same age prepared from the turf B, the stress-strain curves of the two are very close to each other, which indicates that the preparation of the artificial urban solid waste has good repeatability by establishing a quantitative control standard of the artificial urban solid waste.
The applicability of the artificial urban solid wastes prepared by the method under the condition of hypergravity is explored.
Referring to the supergravity centrifugal simulation test performed by Chen et al, the material used in the centrifugal test is very close to various characteristics of real solid wastes of the san francisco, a slope model is established by using Geoslope based on the prototype size, and the calculated critical water level ratio is compared with the critical water level ratio obtained in the centrifugal test, as shown in table 10 below.
TABLE 10 Critical water level ratio comparison
Figure BDA0003089579910000081
From table 10, the critical water level ratio corresponding to the artificial urban solid waste prepared by the method is very close to that obtained by a centrifugal machine simulation test and real solid waste calculation. When the breaking strain is taken to be 20%, the calculated critical water level ratio is in good agreement with the centrifugal test result.
The method proves that the artificial urban solid waste prepared by the method has good applicability under the condition of supergravity.

Claims (1)

1. The utility model provides a characteristic can quantitative control's artifical city under the hypergravity condition is useless admittedly, characterized by:
the preparation method comprises the following steps of taking grass peat, kaolin and quartz sand as raw materials, and keeping the mass ratio of the kaolin to the quartz sand as kaolin: 1:4 of quartz sand;
the method comprises the following steps:
1) determining the proportion of each raw material and weighing:
1.1) measuring and determining the content, the porosity ratio and the water content of the organic matter tendon phase of real solid waste;
1.2) drying kaolin, quartz sand and turf; measuring the organic matter tendon phase content of the turf;
1.4) calculating the preparation proportion of the artificial city solid waste material, so that the organic matter tendon phase content, the pore ratio and the water content of the artificial city solid waste are consistent with those of real solid waste, and weighing according to the calculation result;
2) uniformly mixing the raw materials and adjusting the water content:
2.1) uniformly spreading kaolin on quartz sand, and fully mixing to obtain a mixture;
2.2) grinding the caking parts in the turf, uniformly spreading a mixture of quartz sand and kaolin on the turf, and fully mixing;
2.3) adding water to adjust the water content, so that the water content of the artificial urban solid waste is consistent with that of the real solid waste;
in the step 1.4), the formula for calculating the preparation proportion of the artificial urban solid waste material is as follows:
Figure FDA0003543157190000011
wherein e is the void ratio of the solid waste to be prepared, V is the volume of the solid waste to be prepared, Ds-kIs the specific gravity of kaolin, Ds-sIs the specific gravity of quartz sand, Ds-pThe specific gravity of the turf is shown, N is the content of organic tendon phase in the artificial urban solid waste to be prepared, N is the content of organic tendon phase in the turf, and w is the water content in the artificial urban solid waste to be prepared; m issMass of quartz sand required for the preparation of the test specimens, mkMass of kaolin required to prepare the test specimens, mpMass of peat required for sample preparation, mwThe quality of water required to prepare the samples.
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