CN113341116B - Clay doping amount estimation method for construction waste roadbed filler - Google Patents
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Abstract
The invention provides a clay doping amount estimation method for a construction waste roadbed filler, which comprises the following steps: respectively preparing construction waste fillers with different clay doping amounts, and performing compaction test on each construction waste filler to determine the corresponding dry density and water content of each construction waste filler; preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler; building a building waste filler load threshold estimation model based on clay doping amount, dry density and water content; and fitting to obtain a regression coefficient based on the clay doping amount, predicting the loading threshold of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading threshold.
Description
Technical Field
The invention relates to the technical field of road engineering, in particular to a clay doping amount prediction method for a construction waste roadbed filler.
Background
With the development of economy and the advancement of urban processes, the corresponding amount of construction waste is increasing. According to the existing data statistics, the total amount of the construction waste generated by China per year is up to about 4.8 hundred million tons, and the total amount of the construction waste generated by the whole country is estimated to be 13 hundred million tons per year in the next ten years. The recovery, disposal and reuse of construction waste has been a widespread problem worldwide to be solved. Therefore, some scholars propose that the construction waste (after crushing, screening and impurity removal processes) can be used as a sustainable highway filler substitute for roadbed filling, so that not only can a large amount of construction waste produced in urban construction be effectively consumed, but also the problems of environmental pollution, large amount of earthwork consumption by roadbed filling and the like caused by mountain and stone mining in road construction can be solved, and obvious economic benefits are obtained.
However, although there are many advantages in using construction waste as roadbed filler, the material itself has complex composition, poor grading, high porosity and large strength difference, which is a great challenge for the construction waste to become a high-quality roadbed filler, at present, clay is generally used to improve the construction waste filler, and the clay doping amount is determined by determining the load threshold of the construction waste roadbed filler, so as to provide a certain reference for deformation stability analysis of the construction waste roadbed filler under the action of vehicle cyclic load.
The existing clay doping amount determining method comprises the following two steps: the first method is an empirical method, but the proposed clay doping amount is widely changed, and quantitative analysis cannot be performed; and secondly, comparing the maximum dry density and the change of the optimal water content of fillers with different clay doping amounts according to compaction test results so as to define the clay doping amount, wherein the method has single consideration factors and is not easy to directly determine the result.
Disclosure of Invention
In view of the above, the invention provides a clay doping amount estimation method for a construction waste roadbed filler, so as to estimate the clay doping amount of the construction waste roadbed filler rapidly, simply and effectively.
In order to achieve the above object, the technical solution of the embodiment of the present invention is as follows:
the embodiment of the invention provides a clay doping amount estimation method for a construction waste roadbed filler, which comprises the following steps:
respectively preparing building waste fillers with different clay doping amounts, and performing compaction test on each building waste filler to determine the corresponding dry density and water content of each building waste filler;
preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler;
building a building waste filler load threshold estimation model based on the clay doping amount, the dry density and the water content;
and fitting to obtain a regression coefficient based on the clay doping amount, predicting the loading threshold of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading threshold.
Optionally, the building waste filler load threshold estimation model is:
σ LT ＝a(bλ 2 +cλ+d)EXP[e(ρ OMC -ρ)]；
wherein sigma LT As load threshold, lambda is clay doping amount, ρ OMC For the maximum dry density corresponding to the optimum water content, ρ is the initial dry density and α, b, c, d, e are the regression coefficients.
Optionally, the construction waste fillers with different clay doping amounts are respectively configured, and a compaction test is performed on each construction waste filler to determine the corresponding dry density and water content of each construction waste filler, including:
drying clay and construction waste required by a compaction test, preparing construction waste fillers according to clay doping amounts of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%, empirically predicting a first water content of the construction waste fillers under the current clay doping amount, carrying out gradient change on the first water content by taking 2% water content as a difference value, respectively preparing the construction waste fillers with different water contents under the current clay doping amount, respectively packaging and filling the construction waste fillers for 18 hours by using plastic sealing bags, and enabling the internal humidity of the fillers to reach a uniform state; and (3) after the stuffiness is finished, adopting a three-layer method to carry out compaction test, weighing the filler sample after the compaction is finished, selecting a typical construction waste filler sample after demoulding to test the water content of the filler sample, and calculating the dry density of the construction waste filler sample according to the volume of a standard test cylinder and the quality of the construction waste filler sample.
Optionally, the preparing filler samples with different compactibility based on each building waste, and performing a static triaxial test on each filler sample to obtain a loading threshold value of the filler sample under different simulated working conditions, and determining clay doping amount of each building waste filler, including:
preparing construction waste filler samples with target compactibility of 93% and 96%, and performing a static triaxial test on each construction waste filler sample with target compactibility to obtain a load threshold of the construction waste filler sample, and confirming clay doping amount of each construction waste filler based on the load threshold.
Optionally, the dry density includes an initial dry density, and the specific calculation process of the initial dry density is as follows:
obtaining the initial dry density based on the target compactness and the construction waste filler sample according to the first dry density of the construction waste filler sample obtained by the compaction test under different clay doping amounts;
wherein C is the degree of compaction, ρ is the initial dry density, ρ OMC And the first dry density corresponding to the first water content.
Optionally, the α=3.262, b= -0.061, c=6.249, d=84.395, e= -4.403.
The embodiment of the invention provides a clay doping amount estimation method for a construction waste roadbed filler, which comprises the following steps: respectively preparing building waste fillers with different clay doping amounts, and performing compaction test on each building waste filler to determine the corresponding dry density and water content of each building waste filler; preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler; building a building waste filler load threshold estimation model based on the clay doping amount, the dry density and the water content; fitting to obtain regression coefficients alpha and b, c, d, e based on the clay doping amount, predicting loading thresholds of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading thresholds; therefore, the blank of the method for estimating the mixing amount of the building waste filler clay is supplemented, and the method has a certain guiding significance for road engineering design and construction and has higher engineering application value; meanwhile, the prediction method has definite physical meaning and simple structure, and can more accurately predict the load threshold value of the building waste filler under the conditions of given clay doping amount and compactness only by carrying out compaction test of the building waste filler in practical application, so that the clay doping amount is determined, the test time consumption is greatly reduced, the test difficulty is reduced, obvious engineering convenience is provided for units without triaxial test conditions, and the method has higher market popularization value.
Drawings
FIG. 1 is a schematic flow chart of a clay doping amount estimation method for a construction waste roadbed filler, which is provided by the embodiment of the invention;
FIG. 2 is a graph showing the relationship between clay incorporation and load threshold at 93% compactness of a clay incorporation prediction method for construction waste roadbed filler according to an embodiment of the present invention;
fig. 3 is a graph showing a relationship between clay doping amount and a load threshold value under 96% compactness of a clay doping amount estimation method for a construction waste roadbed filler according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides a clay doping amount estimation method for a construction waste roadbed filler, which includes:
step S1: respectively preparing building waste fillers with different clay doping amounts, and performing compaction test on each building waste filler to determine the corresponding dry density and water content of each building waste filler;
the maximum dry density and the optimal water content of the construction waste filler under different clay doping amounts are obtained, and basic indexes are provided for the subsequent calculation of initial dry density.
Step S2: preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler;
step S3: building a building waste filler load threshold estimation model based on the clay doping amount, the dry density and the water content;
step S4: and fitting to obtain a regression coefficient based on the clay doping amount, predicting the loading threshold of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading threshold.
According to the embodiment of the invention, the blank of the method for estimating the mixing amount of the building waste filler clay is supplemented, and the method has a certain guiding significance for road engineering design and construction and has higher engineering application value; meanwhile, the prediction method has definite physical meaning and simple structure, and can more accurately predict the load threshold value of the building waste filler under the conditions of given clay doping amount and compactness only by carrying out compaction test of the building waste filler in practical application, so that the clay doping amount is determined, the test time consumption is greatly reduced, the test difficulty is reduced, obvious engineering convenience is provided for units without triaxial test conditions, and the method has higher market popularization value.
In one embodiment, the construction waste filler load threshold estimation model is:
σ LT ＝a(bλ 2 +cλ+d)EXP[e(ρ OMC -ρ)]；
wherein sigma LT As load threshold, lambda is clay doping amount, ρ OMC For the maximum dry density corresponding to the optimum water content, ρ is the initial dry density and α, b, c, d, e are the regression coefficients.
In one embodiment, the steps of respectively configuring the construction waste fillers with different clay doping amounts, and performing compaction test on each construction waste filler to determine the corresponding dry density and water content of each construction waste filler comprise:
drying clay and construction waste required by a compaction test, preparing construction waste fillers according to clay doping amounts of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%, empirically predicting a first water content of the construction waste fillers under the current clay doping amount, carrying out gradient change on the first water content by taking 2% water content as a difference value, respectively preparing the construction waste fillers with different water contents under the current clay doping amount, respectively packaging and filling the construction waste fillers for 18 hours by using plastic sealing bags, and enabling the internal humidity of the fillers to reach a uniform state; and (3) after the stuffiness is finished, adopting a three-layer method to carry out compaction test, weighing the filler sample after the compaction is finished, selecting a typical construction waste filler sample after demoulding to test the water content of the filler sample, and calculating the dry density of the construction waste filler sample according to the volume of a standard test cylinder and the quality of the construction waste filler sample.
Here, compaction tests are carried out on the construction waste filler with the clay doping amount of 0% -90%, so that the maximum dry density and the optimal water content of the filler with different clay doping amounts are obtained, and basic indexes are provided for the calculation of the subsequent initial dry density. The method comprises the following steps: drying clay and construction waste required by a compaction test for 18 hours, preparing construction waste fillers according to clay doping amounts of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%, and determining the maximum dry density and the optimal water content of the construction waste fillers under different clay doping amounts by adopting the following method: estimating the optimal water content of the building waste filler under the current clay doping amount according to experience, carrying out gradient change on the estimated optimal water content of the current building waste filler by taking 2% water content as a difference value, then respectively configuring the building waste fillers with different water contents under the current clay doping amount, respectively packaging and filling the building waste fillers for 18 hours by using a plastic sealing bag, and enabling the humidity inside the fillers to reach a uniform state; and after the stuffiness is finished, according to the related requirements of highway geotechnical test regulations (JTG E40-2007), adopting a three-layer method to carry out compaction test, weighing a filler sample after the compaction is finished, selecting a typical construction waste filler sample after demoulding to test the water content of the filler sample, calculating the dry density of the construction waste filler sample according to the volume of a standard test cylinder and the mass of the construction waste filler sample, and drawing a relation curve of the dry density and the water content of the construction waste filler sample, wherein the vertical and horizontal coordinates of a peak point on the curve are respectively the maximum dry density and the optimal water content, and the result is shown in a table 1.
TABLE 1
In an embodiment, the preparing filler samples with different compactibility based on each building waste, and performing a static triaxial test on each filler sample to obtain loading thresholds simulating the filler samples under different working conditions, and determining clay doping amount of each building waste filler includes:
preparing construction waste filler samples with target compactibility of 93% and 96%, and performing a static triaxial test on each construction waste filler sample with target compactibility to obtain a load threshold of the construction waste filler sample, and confirming clay doping amount of each construction waste filler based on the load threshold.
On the basis of the compaction test result, respectively preparing construction waste fillers with the mixing amounts of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% of clay, carrying out hydrostatic forming on filler samples (diameter 15cm and height 30 cm) with different target compactibility (93% and 96%) by a universal hydraulic testing machine, and carrying out a static triaxial test on the filler samples, wherein the static triaxial test adopts a strain rate of 0.02mm/s to load the filler samples, if the construction waste filler samples are destroyed before the axial strain reaches 15%, taking the peak point of the axial stress as a load threshold, and if the test pieces are still not destroyed when the axial strain reaches 15%, taking the load threshold of the test pieces under the axial stress at the moment. The construction waste filler load threshold results under different clay doping amounts and compactness conditions are shown in fig. 2 and 3. It is clear that under 93% and 96% compactness conditions, the loading threshold of the construction waste filler reaches the peak point when the clay incorporation reaches 60%, i.e. the 60% clay incorporation is the optimal clay incorporation of the construction waste filler.
In one embodiment, the dry density comprises an initial dry density, and the initial dry density is specifically calculated as follows:
obtaining the initial dry density based on the target compactness and the construction waste filler sample according to the first dry density of the construction waste filler sample obtained by the compaction test under different clay doping amounts;
wherein C is the degree of compaction, ρ is the initial dry density, ρ OMC The corresponding first water contentA first dry density.
In one embodiment, the α=3.262, b= -0.061, c=6.249, d=84.395, e= -4.403.
The regression coefficients alpha and b, c, d, e are obtained based on static triaxial test data fitting, and the loading threshold values of the building waste filler under different clay doping amounts, maximum dry density and initial dry density conditions are predicted through a step prediction model, so that the optimal clay doping amount of the building waste filler is predicted. This fitting step is prior art and the fitting results are shown in table 2. From the table, the correlation coefficient R2 of the estimated model is 0.81, which indicates that the model accuracy is high.
TABLE 2
The embodiment of the invention provides a clay doping amount estimation method for a construction waste roadbed filler, which comprises the following steps: respectively preparing building waste fillers with different clay doping amounts, and performing compaction test on each building waste filler to determine the corresponding dry density and water content of each building waste filler; preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler; building a building waste filler load threshold estimation model based on the clay doping amount, the dry density and the water content; fitting to obtain regression coefficients alpha and b, c, d, e based on the clay doping amount, predicting loading thresholds of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading thresholds; therefore, the blank of the method for estimating the mixing amount of the building waste filler clay is supplemented, and the method has a certain guiding significance for road engineering design and construction and has higher engineering application value; meanwhile, the prediction method has definite physical meaning and simple structure, and can more accurately predict the load threshold value of the building waste filler under the conditions of given clay doping amount and compactness only by carrying out compaction test of the building waste filler in practical application, so that the clay doping amount is determined, the test time consumption is greatly reduced, the test difficulty is reduced, obvious engineering convenience is provided for units without triaxial test conditions, and the method has higher market popularization value.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (3)
1. The clay doping amount estimation method for the construction waste roadbed filler is characterized by comprising the following steps of:
respectively preparing building waste fillers with different clay doping amounts, and performing compaction test on each building waste filler to determine the corresponding dry density and water content of each building waste filler;
preparing filler samples with different compactibility based on each building waste, carrying out a static triaxial test on each filler sample to obtain loading thresholds of the filler samples under different simulated working conditions, and determining clay doping amount of each building waste filler;
building a building waste filler load threshold estimation model based on the clay doping amount, the dry density and the water content;
fitting to obtain a regression coefficient based on the clay doping amount, predicting the loading threshold of the building waste filler under different working conditions through the building waste filler loading threshold prediction model, and determining the clay doping amount of the building waste filler based on the loading threshold; the building waste filler load threshold prediction model is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
for the load threshold value->
Is clay doped amount->
Maximum dry density for optimum water content, +.>
For the initial dry density of the product,α、b、c、d、eis a regression coefficient; the method for preparing the construction waste filler with different clay doping amounts respectively, and carrying out compaction test on each construction waste filler to determine the corresponding dry density and water content of each construction waste filler comprises the following steps:
drying clay and construction waste required by a compaction test, preparing construction waste fillers according to clay doping amounts of 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%, empirically predicting a first water content of the construction waste fillers under the current clay doping amount, carrying out gradient change on the first water content by taking 2% water content as a difference value, respectively preparing the construction waste fillers with different water contents under the current clay doping amount, respectively packaging and filling the construction waste fillers for 18 hours by using plastic sealing bags, and enabling the internal humidity of the fillers to reach a uniform state; performing compaction test by adopting a three-layer method after the material is subjected to the compaction test, weighing a filler sample after the compaction is completed, selecting a typical construction waste filler sample after demoulding to test the water content of the filler sample, and calculating the dry density of the construction waste filler sample according to the volume of a standard test cylinder and the quality of the construction waste filler sample; preparing filler samples with different compactibility based on each building waste, and performing a static triaxial test on each filler sample to obtain a load threshold simulating the filler samples under different working conditions, and determining clay doping amount of each building waste filler, wherein the method comprises the following steps:
preparing construction waste filler samples with target compactibility of 93% and 96%, and performing a static triaxial test on each construction waste filler sample with target compactibility to obtain a load threshold of the construction waste filler sample, and confirming clay doping amount of each construction waste filler based on the load threshold.
2. The clay incorporation prediction method for construction waste roadbed fillers according to claim 1, wherein the dry density comprises an initial dry density, and the specific calculation process of the initial dry density is as follows:
obtaining the initial dry density based on the target compactness and the construction waste filler sample according to the first dry density of the construction waste filler sample obtained by the compaction test under different clay doping amounts;
in the method, in the process of the invention,
for compactness, ++>
For initial dry density, +.>
And the first dry density corresponding to the first water content.
3. The clay incorporation amount estimation method for a construction waste roadbed filler according to claim 1, wherein the following isα3.262, saidbIs-0.061, thec6.249, saidd84.395, saideIs-4.403.
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