CN111827032B - Processing method for determining structural thickness of pavement paved on hardened layer of beam field - Google Patents
Processing method for determining structural thickness of pavement paved on hardened layer of beam field Download PDFInfo
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- CN111827032B CN111827032B CN202010698331.2A CN202010698331A CN111827032B CN 111827032 B CN111827032 B CN 111827032B CN 202010698331 A CN202010698331 A CN 202010698331A CN 111827032 B CN111827032 B CN 111827032B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
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- E—FIXED CONSTRUCTIONS
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
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Abstract
A process for determining the structural thickness of a pavement structure applied to a hardened layer of a beam field, comprising: when the elevation of the top surface of the beam field hardened layer is smaller than the preset elevation of the top surface of the roadbed, measuring the equivalent resilience modulus and filling the gravel layer on the top surface of the beam field hardened layer, and determining the thickness of the paved road surface structure based on the equivalent resilience modulus of the top surface of the beam field hardened layer and the elasticity modulus of the gravel layer; the acquisition process of the elastic modulus of the crushed stone layer comprises the following steps: measuring the equivalent resilience modulus of the top surface of the crushed stone layer, and calculating a first calculated deflection value of the top surface of the crushed stone layer based on the equivalent resilience modulus of the top surface of the crushed stone layer; calculating a second calculated deflection value of the top surface of the gravel layer based on the equivalent resilience modulus of the top surface of the beam field hardened layer and the obtained initial modulus of the gravel layer; and continuously adjusting the initial modulus of the crushed stone layer until the error between the second calculated deflection value and the first calculated deflection value is within a preset error range, so as to obtain the elastic modulus of the crushed stone layer. The invention scientifically determines the design thickness of the pavement structure paved on the beam field hardening layer.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a processing method for determining the thickness of a structure of a pavement additionally paved on a hardened layer of a beam field.
Background
In the highway construction process, because the blasting operation that a large amount of rock tunnels and cutting slopes exist in the part mark section, a large amount of large-particle-size gravel materials are formed, and in order to reasonably utilize abandoned stone space and save the transport distance and the cost, the gravel materials are used for filling the high embankment. In addition, bridges are generally arranged along the line, the bridge prefabricating task is large, the bridge is influenced by the terrain, no proper site is arranged along the line, the bridge prefabricating field can be used as the bridge prefabricating field, therefore, the prefabricating field is often arranged on the high rockfill embankment, namely, the construction of the prefabricating field is that gravels are filled on the existing soil foundation to form a rockfill roadbed, and cement concrete is laid on the rockfill roadbed to serve as a beam field hardening layer, so that the damage to the surrounding environment is reduced.
The conventional processing method after the precast yard completes the function is that the reinforced concrete pedestal and the beam yard hardened layer are broken before the pavement cushion layer construction, then the construction is carried out to the level of the roadbed top layer, the construction of the pavement structure layer is carried out after the acceptance check is qualified, a large amount of manpower, material resources and construction period are consumed, the resource waste is caused, the construction progress of pavement paving is influenced, the problem of stacking of waste slag is caused, the environmental protection is unfavorable, if the beam yard hardened layer on the rockfill roadbed is comprehensively utilized, the design technology of directly additionally laying the pavement structure on the beam yard hardened layer is lacked. Before adding the construction of paving surface structure, how to handle roof beam field sclerosis layer, how scientific the design thickness who adds the paving surface structure of the definite design thickness of how the roof beam field sclerosis layer after handling, can prevent that the road surface from adding the too conservative design of paving structure thickness and causing the unnecessary extravagant, save the engineering cost with the engineering time and the construction cost of paving surface structure engineering to guarantee to add the engineering quality of paving surface structure. Therefore, for a beam field hardened layer plus pavement structure on a rockfill subgrade, a processing method for determining the thickness of the beam field hardened layer plus pavement structure is needed.
Disclosure of Invention
The invention aims to provide a processing method for determining the thickness of a pavement structure on a hardened layer of a beam field, which is used for scientifically determining the design thickness of the pavement structure on the hardened layer of the beam field, saving the construction time and cost of a pavement structure project, saving the construction cost and ensuring the project quality of the pavement structure.
The invention is realized by the following technical scheme:
a process for determining the structural thickness of a pavement structure applied to a hardened layer of a beam field, comprising the steps of:
s1, chiseling a pedestal structure on the beam field hardening layer, trimming the top surface of the beam field hardening layer after chiseling the pedestal, and repairing cracks on the top surface of the beam field hardening layer;
s2, measuring the top surface elevation of the beam field hardening layer, and judging whether the top surface elevation of the beam field hardening layer is smaller than the preset road bed top surface elevation or not;
s3, if yes, measuring the equivalent resilience modulus of the top surface of the beam field hardened layer, and filling unscreened crushed stones on the top surface of the beam field hardened layer to the preset road bed top surface elevation to form a crushed stone layer;
s4, determining the thickness of the paved road surface structure based on the equivalent resilience modulus of the top surface of the beam field hardening layer and the elastic modulus of the gravel layer;
wherein, the acquisition process of the elastic modulus of the crushed stone layer is as follows:
(1) measuring the equivalent modulus of resilience of the top surface of the crushed stone layer;
(2) based on the equivalent resilience modulus of the top surface of the crushed stone layer, calculating a first calculated deflection value of the top surface of the crushed stone layer under the action of standard load by using mechanical software;
(3) acquiring an initial modulus of the gravel layer, and calculating a second calculation deflection value of the top surface of the gravel layer under the action of standard load by applying mechanical software on the basis of the equivalent resilience modulus of the top surface of the beam field hardened layer and the initial modulus of the gravel layer under the conditions that the gravel layer is regarded as a structural layer, and the beam field hardened layer, the rock-filled roadbed and the soil foundation are combined into a structural layer and used as a semi-infinite elastic foundation;
(4) and (3) judging whether the error amount between the second calculated deflection value and the first calculated deflection value is within a preset error amount range, if not, continuously adjusting the initial modulus of the crushed stone layer according to a preset correction rule, repeating the step (3) until the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error range, and taking the adjusted initial modulus of the crushed stone layer as the elastic modulus of the crushed stone layer.
Further, the step of continuously adjusting the initial modulus of the crushed stone layer according to a preset correction rule comprises:
(4-1) judging whether the second calculated deflection value is greater than the first calculated deflection value;
(4-2) if so, adding the preset modulus increase value to the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer;
and (4-3) if not, subtracting the preset modulus reduction value from the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer.
Further, after step S2, the method further includes:
s21, if not, testing the deflection of a plurality of deflection test points on the top surface of the beam field hardening layer by using a drop weight deflectometer to obtain a group of measured deflection basin data of the top surface of the beam field hardening layer;
s22, under the condition that the beam field hardened layer is regarded as a structural layer, the rockfill roadbed and the soil foundation are divided into a structural layer and are used as a semi-infinite elastic foundation, performing inverse calculation processing on the obtained group of actually measured deflection basin data to obtain the resilience modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed;
and S23, determining the thickness of the paved road surface structure based on the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the stone-filled roadbed.
Further, the step of performing inverse calculation processing on the obtained group of actually measured deflection basin data to obtain the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed comprises the following steps:
s221, establishing an error control relational expression between theoretical deflection basin data and actual measurement deflection basin data by adopting a nonlinear mechanical analysis model:
in the formula WiIs a theoretical deflection value of a deflection test point based on hj、Ej、μj、RjP and a are calculated as hjIs a structure ofThickness of the layer, EjIs the modulus of elasticity, μ, of each structural layerjIs the Poisson's ratio, R, of the respective structural layersjThe distance from each sensor test point to the load center, P is the load applied by the falling weight deflectometer, a is the load action radius, m is the number of the sensor test points, j is the number of the structural layers, epsilon2Is the sum of the relative square errors between the measured deflection basin and the theoretical deflection basin, LiIs the measured deflection value, q, of the deflection test pointiA weighting coefficient is selected according to the fitting precision of the actually measured deflection basin data;
s222, inversely calculating to obtain the elastic modulus of the hardened layer of the beam field and the equivalent resilience modulus of the top surface of the rockfill roadbed based on the obtained group of actually measured deflection basin data and the error control relational expression.
Further, utilize the formula of falling weight deflectometer to test the deflection of a plurality of deflection test points of roof beam field sclerosis layer top surface to the step that a set of actual measurement deflection basin data of roof beam field sclerosis layer top surface includes:
s211, testing a plurality of deflection test points on the top surface of the beam field hardened layer by using a drop hammer deflectometer to obtain a deflection value of the top surface of the beam field hardened layer, and judging whether the deflection value of the top surface of the beam field hardened layer is greater than a preset deflection value checked and accepted on the top surface of the rockfill roadbed;
s212, if yes, grouting reinforcement is conducted on the beam field hardening layer;
and S213, repeating the step S211 and the step S212 until the deflection value of the top surface of the beam field hardened layer is smaller than or equal to the preset acceptance deflection value of the top surface of the stone-filled roadbed, and recording a set of measured deflection basin data obtained by the current drop hammer type deflectometer test so as to obtain a set of measured deflection basin data of the top surface of the beam field hardened layer.
Further, the step of trimming the top surface of the beam field hardening layer after the pedestal is chiseled off comprises the following steps:
s11, finishing the top surface of the beam field hardening layer to enable the road arch cross slope of the top surface of the beam field hardening layer to be 1% -2%.
Further, the step of repairing cracks on the top surface of the beam field hardening layer comprises the following steps:
s12, forming a plurality of rectangular grooves at intervals along the crack trend of the top surface of the beam field hardening layer;
s13, respectively inserting fixed connecting nails at two ends of the bottom of the rectangular groove along the length direction of the rectangular groove, and pouring concrete into the rectangular groove until the concrete is higher than the fixed connecting nails;
s14, placing a glass fiber net formed by glass fiber reinforcements at the top of the concrete poured in the rectangular groove, and pouring the concrete into the rectangular groove until the concrete is higher than the top of the glass fiber net;
and S15, placing hot-rolled ribbed steel bars on the tops of the concrete poured in the rectangular grooves, enabling the length direction of the hot-rolled ribbed steel bars to be consistent with the length of the rectangular grooves, and pouring the concrete into the rectangular grooves to the tops of the rectangular grooves.
Further, the distance between the centers of the adjacent rectangular grooves is 50 cm.
Further, the mechanics software is the bisar software.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of measuring the equivalent resilience modulus of the top surface of the beam field hardened layer and the equivalent resilience modulus of the top surface of the crushed stone layer, obtaining a first calculated deflection value of the top surface of the crushed stone layer according to the equivalent resilience modulus of the top surface of the beam field hardened layer, obtaining a second calculated deflection value of the top surface of the crushed stone layer according to the equivalent resilience modulus of the top surface of the crushed stone layer and the obtained initial modulus of the top surface of the beam field hardened layer, continuously adjusting the initial modulus of the crushed stone layer until the error between the second calculated deflection value and the first calculated deflection value is within a preset error range, so that the adjusted initial modulus of the crushed stone layer is used as the modulus of the crushed stone layer, and compared with the traditional modulus of the crushed stone layer obtained through a material test or a standard check material elastic modulus table, the method considers the influence of the beam field hardened layer on the modulus of the crushed stone layer, therefore, the obtained crushed modulus is more accurate and scientific, and further more accurate and scientific in determining the thickness of the pavement, the method can prevent unnecessary waste caused by over-conservative design of the thickness of the pavement paving structure, save the construction time and the construction cost of the pavement paving structure project, save the construction cost and ensure the project quality of the pavement paving structure.
Drawings
FIG. 1 is a flow chart illustrating the steps of a process for determining the thickness of a pavement structure applied to a hardened layer of a beam field according to the present invention;
FIG. 2 is a top view structural diagram of a crack repair of a top surface of a beam field hardened layer in the processing method for determining the structural thickness of a pavement to be paved on the beam field hardened layer according to the present invention;
FIG. 3 is a cross-sectional structural view showing the repair of cracks on the top surface of a beam field hardened layer in the processing method for determining the structural thickness of a pavement applied on the beam field hardened layer according to the present invention.
In the figure, 1-concrete, 2-crack, 3-rectangular groove, 4-steel bar, 5-fixed connection nail, 6-glass fiber net.
Detailed Description
The invention is further illustrated by the following figures and examples.
Referring to fig. 1, fig. 1 is a flow chart illustrating steps of a method for determining a thickness of a pavement structure applied to a hardened layer of a beam field according to the present invention. A process for determining the structural thickness of a pavement structure applied to a hardened layer of a beam field, comprising the steps of:
s1, chiseling a pedestal structure on the beam field hardening layer, trimming the top surface of the beam field hardening layer after chiseling the pedestal, and repairing cracks on the top surface of the beam field hardening layer;
s2, measuring the top surface elevation of the beam field hardening layer, and judging whether the top surface elevation of the beam field hardening layer is smaller than the preset road bed top surface elevation or not;
s3, if yes, measuring the equivalent resilience modulus of the top surface of the beam field hardened layer, and filling unscreened crushed stones on the top surface of the beam field hardened layer to the preset road bed top surface elevation to form a crushed stone layer;
s4, determining the thickness of the paved road surface structure based on the equivalent resilience modulus of the top surface of the beam field hardening layer and the elastic modulus of the gravel layer;
wherein, the acquisition process of the elastic modulus of the crushed stone layer is as follows:
(1) measuring the equivalent modulus of resilience of the top surface of the crushed stone layer;
(2) based on the equivalent resilience modulus of the top surface of the crushed stone layer, calculating a first calculated deflection value of the top surface of the crushed stone layer under the action of standard load by using mechanical software;
(3) acquiring an initial modulus of the gravel layer, and calculating a second calculation deflection value of the top surface of the gravel layer under the action of standard load by applying mechanical software on the basis of the equivalent resilience modulus of the top surface of the beam field hardened layer and the initial modulus of the gravel layer under the conditions that the gravel layer is regarded as a structural layer, and the beam field hardened layer, the rock-filled roadbed and the soil foundation are combined into a structural layer and used as a semi-infinite elastic foundation;
(4) and (3) judging whether the error amount between the second calculated deflection value and the first calculated deflection value is within a preset error amount range, if not, continuously adjusting the initial modulus of the crushed stone layer according to a preset correction rule, repeating the step (3) until the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error range, and taking the adjusted initial modulus of the crushed stone layer as the elastic modulus of the crushed stone layer.
In step S1, a pavement structure is to be added on the beam field hardened layer, all pedestal structures on the beam field hardened layer need to be chiseled off, the top surface of the beam field hardened layer is exposed, then the top surface of the beam field hardened layer is trimmed, cracks on the beam field hardened layer are repaired, and the subsequent elevation measurement and the modulus of resilience measurement are performed on the beam field hardened layer, and the pavement structure is added.
Further, in step S1, the step of trimming the top surface of the beam field hardening layer after the pedestal is removed includes:
s11, finishing the top surface of the beam field hardening layer to enable the road arch cross slope of the top surface of the beam field hardening layer to be 1% -2%.
Referring to fig. 2 and 3, fig. 2 is a top view structural diagram of the top surface crack repair of the beam field hardened layer in the processing method for determining the structural thickness of the paved surface on the beam field hardened layer according to the present invention, and fig. 3 is a cross-sectional structural diagram of the top surface crack repair of the beam field hardened layer in the processing method for determining the structural thickness of the paved surface on the beam field hardened layer according to the present invention. Further, in the step S1, the repairing the crack 2 on the top surface of the beam field hardened layer includes:
s12, arranging a plurality of rectangular grooves 3 at intervals along the trend of the cracks 2 on the top surface of the beam field hardening layer;
s13, respectively inserting fixed connecting nails 5 into the two ends of the bottom of the rectangular groove 3 along the length direction of the rectangular groove, and pouring concrete 1 into the rectangular groove 3 until the height of the concrete is higher than the fixed connecting nails 5;
s13, placing a glass fiber net 6 formed by glass fiber reinforced plastic on the top of the concrete 1 poured in the rectangular groove 3, and pouring the concrete 1 into the rectangular groove 3 until the top of the glass fiber net 6 is higher than the top of the concrete 1;
and S15, placing the hot-rolled ribbed steel bar 4 on the top of the concrete 1 poured into the rectangular groove 3, wherein the length direction of the hot-rolled ribbed steel bar 4 is consistent with the length of the rectangular groove 3, and pouring the concrete 1 into the rectangular groove 3 to the top of the rectangular groove 3.
In the above steps S12 to S15, a plurality of rectangular grooves 3 are formed at intervals along the direction of the crack 2 on the top surface of the beam field hardened layer, the formed rectangular grooves 3 are perpendicular to the top surface of the beam field hardened layer, and the center of the rectangular groove 3 is at the same position as the center of the repaired crack 2. The length of the rectangular groove 3 is 60cm, the width is 8-10 cm, and the depth is 8-10 cm. The distance between adjacent rectangular grooves 3 can be determined according to actual conditions, and preferably, the distance between the centers of adjacent rectangular grooves 3 is 50 cm. 3 bottoms of rectangular channel are provided with two fixed connection nails 5, and the one end of every fixed connection nail 5 is inserted roof beam field sclerosis layer by the bottom of rectangular channel 3 to strengthen the rectangle and repair the concrete 1 of inslot and solidify the back and be connected with roof beam field sclerosis layer with being connected of roof beam field sclerosis layer, strengthen the wholeness of roof beam field sclerosis layer after crack 2 restores. Preferably, the length of the fixed connecting nail 5 is 4-6 cm. The interval sets up hot rolling ribbed steel bar 4 and glass fiber web 6 in rectangular channel 3, the distance between reinforcing bar 4 and the glass fiber web 6 is 1-2cm, glass fiber web 6 is violently indulged the handing-over by a plurality of horizontal glass fiber muscle and a plurality of vertical glass fiber muscle and is formed, the diameter of horizontal glass fiber muscle and vertical glass fiber muscle is 10mm, wherein horizontal glass fiber muscle is parallel with the length direction in rectangle repair groove, interval between two adjacent horizontal glass fiber muscle is 3cm, vertical glass fiber muscle is parallel with the width direction in rectangle repair groove, interval between two adjacent vertical glass fiber muscle is 10 cm. The hot rolled ribbed bar 4 was 50cm in length and 20mm in diameter. Hot rolling ribbed steel 4 and glass fiber net 6 in the rectangular channel 3 can effectively ensure the intensity of crack 2 repair back roof beam field hardening layer crack 2 department, avoid 2 secondary cracks in crack to influence roof beam field hardening layer bulk strength, can show the follow-up result of use that improves roof beam field hardening layer. Adopt the prosthetic roof beam field sclerosis layer of above-mentioned step S12 to S15, guaranteed the level and smooth of roof beam field sclerosis layer top surface, can avoid roof beam field sclerosis layer crack 2 to further enlarge in the use, improve the result of use on roof beam field sclerosis layer, provide good basis and prerequisite for the better utilization on roof beam field sclerosis layer. And the problem that the component force along the road arch direction is further deteriorated due to gravity after the beam field hardening layer is cracked is solved.
In step S2, the roadbed is a foundation of the road surface, and therefore, a road surface structure is additionally paved on the beam field hardened layer, and it is necessary to determine whether the top surface elevation of the beam field hardened layer has reached the preset roadbed top surface elevation, which can be obtained according to the engineering design drawing. The elevation of the top surface of the beam field hardening layer can be measured by instruments such as a level gauge.
In the above step S3, if the elevation of the top surface of the beam field hardened layer is smaller than the preset top surface elevation of the roadbed, the un-screened gravel is required to be filled on the beam field hardened layer to the preset top surface elevation of the roadbed so that the pavement structure can be additionally paved on the beam field hardened layer. Before the unscreened crushed stone is laid, the equivalent modulus of resilience of the top surface of the beam field hardened layer is measured on the top surface of the beam field hardened layer by a bearing plate method, so that the equivalent modulus of resilience of the top surface of the beam field hardened layer is obtained.
In step S4, the equivalent resilience modulus of the top surface of the beam field hardened layer and the elastic modulus of the gravel layer are design parameters of the thickness of the additional pavement structure, and the thickness of the additional pavement structure can be calculated and determined by using software for specifically calculating the thickness of the additional pavement according to the equivalent resilience modulus of the top surface of the beam field hardened layer and the elastic modulus of the gravel layer, which is the prior art and is not described herein again. And the gravel layer on the roof beam field sclerosis layer can lead to the response modulus grow because of the existence on roof beam field sclerosis layer, if the original elastic modulus of the material of still according to the gravel layer on roof beam field sclerosis layer handles, the elastic modulus of the gravel layer on the roof beam field sclerosis layer can be less than actual, this can lead to adding when spreading the road surface structure on the gravel layer of roof beam field sclerosis layer top, too conservative and cause the unnecessary waste to the design of the thickness that adds the road surface structure, and lead to adding the increase of the engineering time and the construction cost of spreading the road surface structure, thereby increase engineering cost. The acquisition process of the elastic modulus of the gravel layer considers the influence of the beam field hardened layer on the elastic modulus of the gravel layer, so that the elastic modulus of the obtained gravel layer is more accurate and scientific, the thickness of the pavement structure on the gravel layer above the beam field hardened layer is determined more accurately and scientifically according to the equivalent resilience modulus of the top surface of the beam field hardened layer and the elastic modulus of the gravel layer, unnecessary waste caused by over-conservative design of the thickness of the pavement structure can be prevented, the construction time and the construction cost of the pavement structure engineering are saved, the construction cost is saved, and the engineering quality of the pavement structure is ensured.
Specifically, the elastic modulus of the crushed stone layer is obtained as follows:
in the step (1), after laying unscreened crushed stone on the hardened layer of the beam field to a preset road bed top surface elevation, measuring the equivalent resilience modulus of the top surface of the crushed stone layer on the top surface of the crushed stone layer by a bearing plate method to obtain the equivalent resilience modulus of the top surface of the crushed stone layer.
In the step (2), the mechanical software may adopt bisar software, the crushed stone layer and the structures below the crushed stone layer are merged and divided into a structural layer, and the structural layer is used as a structure of a semi-infinite elastic foundation, that is, a corresponding calculation model is established in the bisar software according to the structure that the crushed stone layer, the beam field hardened layer, the filled stone roadbed and the soil foundation are merged into a structural layer, and a first calculated deflection value of the top surface of the crushed stone layer under the action of standard load is calculated based on the equivalent resilience modulus of the top surface of the crushed stone layer as a calculation parameter, specifically, the bisar software is used for simulating the application of single-circle uniform load stress of 0.7MPa, the radius is 0.15m, and the first calculated deflection value of the top surface of the crushed stone layer is calculated.
In the step (3), according to the material of the crushed stone layer, the range of the elastic modulus of the crushed stone layer can be checked by the material elastic modulus table, and any value in the checked range of the elastic modulus of the crushed stone layer is used as the initial modulus of the crushed stone layer, so as to obtain the initial modulus of the crushed stone layer. And then according to the structure that the gravel layer is divided into a structural layer, the beam field hardened layer, the rock filling roadbed and the soil foundation are combined into a structural layer and serve as a semi-infinite elastic foundation, a corresponding calculation model is established in the bisar software, a second calculation deflection value of the top surface of the gravel layer is calculated under the action of standard load on the basis of the equivalent resilience modulus of the top surface of the beam field hardened layer and the initial modulus of the gravel layer serving as calculation parameters, specifically, the bisar software is used for simulating and applying single-circle uniformly-distributed load stress of 0.7MPa, the radius is 0.15m, and the second calculation deflection value of the top surface of the gravel layer is calculated.
In the step (4), it is determined whether an error amount between the second calculated deflection value and the first calculated deflection value is within a preset error amount range, and if the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error amount range, it indicates that the deformation caused by applying the standard load to the top surface of the crushed stone layer is similar to or consistent with the deformation caused by applying the standard load to the top surface of the crushed stone layer based on the equivalent resilience modulus of the top surface of the beam field hardened layer and the initial modulus of the crushed stone layer as calculation parameters, and the obtained initial modulus of the crushed stone layer is used as the elastic modulus of the crushed stone layer. If the error amount between the second calculated deflection value and the first calculated deflection value is not within the preset error amount range, adjusting the initial modulus of the gravel layer according to a preset correction rule, dividing the gravel layer into a structural layer, and combining the beam field hardened layer, the rock-filled roadbed and the soil foundation into a structural layer and taking the structural layer as a semi-infinite elastic foundation, establishing a corresponding calculation model in the bisar software, calculating the second calculated deflection value of the top surface of the gravel layer under the action of standard load based on the equivalent resilience modulus of the top surface of the beam field hardened layer and the adjusted initial modulus of the gravel layer as calculation parameters, judging whether the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error amount range again, and continuously adjusting the initial modulus of the gravel layer according to the preset correction rule until the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error amount range, and taking the initial modulus of the adjusted crushed stone layer as the elastic modulus of the crushed stone layer. Above-mentioned step (1) to step (4) have considered the influence of beam yard sclerosis layer to rubble layer elastic modulus, consequently the elastic modulus of rubble layer that obtains is more accurate and scientific, thereby according to the elastic modulus of the rubble layer that obtains and the equivalent modulus of resilience of beam yard sclerosis layer top surface, it is also more accurate and scientific to confirm the thickness that adds the pavement structure on the rubble layer of beam yard sclerosis layer top, can prevent that the road surface from adding the design of paving structure thickness too conservative and causing unnecessary waste, save the engineering cost of construction time and the construction cost who adds the pavement structure engineering, and guarantee to add the engineering quality of pavement structure.
Further, in the step (4), the step of continuously adjusting the initial modulus of the crushed stone layer according to a preset correction rule includes:
(4-1) judging whether the second calculated deflection value is greater than the first calculated deflection value;
(4-2) if so, adding the preset modulus increase value to the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer;
and (4-3) if not, subtracting the preset modulus reduction value from the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer.
In the step (4-1), the step (4-2) and the step (4-3), if the second calculated deflection value is greater than the first calculated deflection value, it indicates that the initial modulus of the crushed stone layer is small, the initial modulus of the crushed stone layer needs to be increased, and the initial modulus of the crushed stone layer is added to a preset modulus increase value to obtain the adjusted initial modulus of the crushed stone layer, where the modulus increase value may be preset according to a requirement, and if the modulus increase value may be preset to 1, that is, the initial modulus of the crushed stone layer is increased by 1 each time of adjustment. If the second calculated deflection value is smaller than the first calculated deflection value, it is indicated that the initial modulus of the crushed stone layer is large, the initial modulus of the crushed stone layer needs to be reduced, and the preset modulus reduction value is subtracted from the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer, wherein the modulus reduction value can be preset according to requirements, and if the modulus reduction value can be preset to 1, the initial modulus of the crushed stone layer is reduced by 1 each time of adjustment. The modulus increase and modulus decrease values can be adjusted as desired.
Further, after the step S2, the method further includes:
s21, if not, testing the deflection of a plurality of deflection test points on the top surface of the beam field hardening layer by using a drop weight deflectometer to obtain a group of measured deflection basin data of the top surface of the beam field hardening layer;
s22, under the condition that the beam field hardened layer is regarded as a structural layer, the rockfill roadbed and the soil foundation are divided into a structural layer and are used as a semi-infinite elastic foundation, performing inverse calculation processing on the obtained group of actually measured deflection basin data to obtain the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed;
and S23, determining the thickness of the paved road surface structure based on the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the stone-filled roadbed.
In step S21, if the elevation of the top surface of the beam field hardened layer reaches the preset elevation of the top surface of the roadbed, the pavement structure can be directly paved on the beam field hardened layer. Testing a plurality of deflection test points on the top surface of the beam field hardening layer by using a drop hammer type deflectometer so as to obtain a set of actually measured deflection basin data L of the top surface of the beam field hardening layer1、L2、L3、……、LmWhere m is the number of deflection test points, typically 7-9. The plurality of deflection test points on the top surface of the beam field hardening layer can be arranged every 20m along the central line of the beam field hardening layer.
Further, in step S21, the step of testing the deflection of the plurality of deflection test points on the top surface of the beam field hardened layer by using the drop hammer deflectometer to obtain a set of measured deflection basin data of the top surface of the beam field hardened layer includes:
s211, testing a plurality of deflection test points on the top surface of the beam field hardened layer by using a drop hammer deflectometer to obtain a deflection value of the top surface of the beam field hardened layer, and judging whether the deflection value of the top surface of the beam field hardened layer is greater than a preset deflection value checked and accepted on the top surface of the rockfill roadbed;
s212, if yes, grouting reinforcement is conducted on the beam field hardening layer;
and S213, repeating the step S211 and the step S212 until the deflection value of the top surface of the beam field hardened layer is smaller than or equal to the preset acceptance deflection value of the top surface of the stone-filled roadbed, and recording a set of measured deflection basin data obtained by the current drop hammer type deflectometer test so as to obtain a set of measured deflection basin data of the top surface of the beam field hardened layer.
In the above steps S211 to S213, the pavement structure is additionally laid on the top surface of the beam field hardened layer, the beam field hardened layer needs to be checked, and the deflection value of the beam field hardened layer needs to be less than or equal to the preset deflection value checked on the top surface of the stone-filled roadbed before the construction of the pavement structure can be performed. If the deflection value of roof beam field sclerosis layer top surface is greater than predetermined stone-filled roadbed top surface and checks and accept the deflection value, then explain the roof beam field sclerosis layer and not reach the standard of checking and accepting, check and accept can not pass through, consequently need carry out the reinforcement of cement concrete slurry to roof beam field sclerosis layer, make the deflection value of roof beam field sclerosis layer be less than or equal to predetermined stone-filled roadbed top surface and check and accept the deflection value, after the acceptance of roof beam field sclerosis layer is qualified, a plurality of deflection test points of reuse weight-dropping type deflectometer to roof beam field sclerosis layer top surface test, in order to obtain a set of deflection basin data that accords with the roof beam field sclerosis layer top surface of the acceptance standard again.
In the step S22, when the modulus is inversely calculated by using the inverse calculation method, the beam field hardened layer is regarded as one structural layer, and the rockfill subgrade and the soil foundation are divided into one structural layer and are used as a semi-infinite elastic foundation, that is, two structural layers are divided, so that the inverse calculation efficiency is high, the accuracy is better, and the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill subgrade are obtained.
Further, in step S22, the step of performing inverse calculation processing on the obtained set of measured deflection basin data to obtain the elastic modulus of the hardened layer of the beam field and the equivalent elastic modulus of the top surface of the rockfill subgrade includes:
s221, establishing the space between theoretical deflection basin data and actual measurement deflection basin data by adopting a nonlinear mechanical analysis modelThe error control relation of (1):
in the formula WiIs a theoretical deflection value of a deflection test point based on hj、Ej、μj、RjP and a are calculated as hjThickness of each structural layer, EjIs the modulus of elasticity, μ, of each structural layerjIs the Poisson's ratio, R, of the respective structural layersjThe distance from each sensor test point to the load center, P is the load applied by the falling weight deflectometer, a is the load action radius, m is the number of the sensor test points, j is the number of the structural layers, epsilon2Is the sum of the relative square errors between the measured deflection basin and the theoretical deflection basin, LiIs the measured deflection value, q, of the deflection test pointiA weighting coefficient is selected according to the fitting precision of the actually measured deflection basin data;
s222, inversely calculating to obtain the elastic modulus of the hardened layer of the beam field and the equivalent resilience modulus of the top surface of the rockfill roadbed based on the obtained group of actually measured deflection basin data and the error control relational expression.
In the above steps S221 and S222, it is assumed that the elastic modulus of the beam field hardening layer is
Poisson's ratio of
The semi-infinite elastic foundation consisting of the rock-fill roadbed and the soil foundation has the elastic modulus of
Poisson's ratio of
And the thickness of the beam field hardening layer is h1The thickness of the semi-infinite elastic foundation is h2，h2Is infinite. RjParameters such as P, a were obtained when tested using a drop weight deflectometer. q. q.siThe value of (A) is set according to the accuracy requirement, e.g.High accuracy requirement, qiThe value of (q) can be 0.999, if the precision requirement is not high, qiThe value of (c) may take on 0.8, etc. In the present embodiment, the number of structural layers is 2, and thus j is 2. Based on hj、Ej、μj、RjCalculating the theoretical deflection value W of each deflection test point by the finite element software according to the P and the a1、W2、W3、……、WmFinite element software is also a common method in back calculation programs, and is not described herein. Substituting the theoretical deflection value and the test deflection value into an error control relational expression
Judging whether the sum of the relative square errors between the theoretical deflection value and the actual deflection value reaches the minimum, if not, continuously adjusting
And
until the sum of the relative square errors between the theoretical deflection value and the actual deflection value is minimized, at which point the adjusted modulus of elasticity
Namely the elastic modulus of the beam field hardening layer after adjustment
I.e. the Poisson's ratio of the hardening layer of the beam field and the adjusted elastic modulus
Namely the elasticity modulus of the semi-infinite elastic foundation consisting of the rockfill subgrade and the soil foundation, namely the equivalent resilience modulus of the top surface of the rockfill subgrade,
namely the Poisson's ratio of the semi-infinite elastic foundation consisting of the rock-fill roadbed and the soil foundation.
In step S23, when the top elevation of the beam field hardened layer is greater than the preset top elevation of the roadbed, the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed are design parameters of the thickness of the additional pavement structure, and the thickness of the additional pavement structure can be calculated and determined by using software for specifically calculating the thickness of the additional pavement according to the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed. The modulus difference between the rock-fill subgrade and the soil foundation is not large, the beam field hardened layer is regarded as a structural layer during reverse calculation, the rock-fill subgrade and the soil foundation are combined to be regarded as a structural layer, and the rock-fill subgrade and the soil foundation are regarded as a semi-infinite elastic foundation, so that the efficiency and the precision of reverse calculation are higher than those of reverse calculation when the beam field hardened layer, the rock-fill subgrade and the soil foundation are divided into three structural layers, and the soil foundation is longitudinally infinite, namely a rigid subjacent layer is not arranged, and a reverse calculation model actually restrains the bottom during modeling and is equivalent to a rigid subjacent layer with a fixed depth. Therefore, the beam field hardened layer is regarded as a structural layer, the rockfill roadbed and the soil foundation are combined and regarded as a structural layer to be subjected to inverse calculation, mutual matching between the structural layers is reduced, and the elastic modulus of the obtained beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed are more accurate and scientific. Therefore, the thickness of the additionally paved pavement structure is determined more accurately and scientifically according to the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of measuring the equivalent resilience modulus of the top surface of the beam field hardened layer and the equivalent resilience modulus of the top surface of the crushed stone layer, obtaining a first calculated deflection value of the top surface of the crushed stone layer according to the equivalent resilience modulus of the top surface of the beam field hardened layer, obtaining a second calculated deflection value of the top surface of the crushed stone layer according to the equivalent resilience modulus of the top surface of the crushed stone layer and the obtained initial modulus of the top surface of the beam field hardened layer, continuously adjusting the initial modulus of the crushed stone layer until the error between the second calculated deflection value and the first calculated deflection value is within a preset error range, so that the adjusted initial modulus of the crushed stone layer is used as the modulus of the crushed stone layer, and compared with the traditional modulus of the crushed stone layer obtained through a material test or a standard check material elastic modulus table, the method considers the influence of the beam field hardened layer on the modulus of the crushed stone layer, therefore, the obtained crushed modulus is more accurate and scientific, and further more accurate and scientific in determining the thickness of the pavement, the method can prevent unnecessary waste caused by over-conservative design of the thickness of the pavement paving structure, save the construction time and the construction cost of the pavement paving structure project, save the construction cost and ensure the project quality of the pavement paving structure.
The present invention is not limited to the above-described embodiments, and various modifications and variations of the present invention are intended to be included within the scope of the claims and the equivalent technology of the present invention if they do not depart from the spirit and scope of the present invention.
Claims (8)
1. A process for determining the structural thickness of a pavement structure applied to a hardened layer in a beam yard, comprising the steps of:
s1, chiseling a pedestal structure on the beam field hardening layer, trimming the top surface of the beam field hardening layer after chiseling the pedestal, and repairing cracks on the top surface of the beam field hardening layer;
s2, measuring the top surface elevation of the beam field hardening layer, and judging whether the top surface elevation of the beam field hardening layer is smaller than the preset road bed top surface elevation or not, if so, executing the step S3 to the step S4, and if not, executing the step S5 to the step S7;
s3, measuring the equivalent resilience modulus of the top surface of the beam field hardened layer, and filling unscreened broken stones on the top surface of the beam field hardened layer to a preset road bed top surface elevation to form a broken stone layer;
s4, determining the thickness of the paved road surface structure based on the equivalent resilience modulus of the top surface of the beam field hardening layer and the elastic modulus of the gravel layer;
wherein, the acquisition process of the elastic modulus of the crushed stone layer is as follows:
(1) measuring the equivalent modulus of resilience of the top surface of the crushed stone layer;
(2) based on the equivalent resilience modulus of the top surface of the crushed stone layer, calculating a first calculated deflection value of the top surface of the crushed stone layer under the action of standard load by using mechanical software;
(3) acquiring an initial modulus of the gravel layer, and calculating a second calculation deflection value of the top surface of the gravel layer under the action of standard load by applying mechanical software on the basis of the equivalent resilience modulus of the top surface of the beam field hardened layer and the initial modulus of the gravel layer under the conditions that the gravel layer is regarded as a structural layer, and the beam field hardened layer, the rock-filled roadbed and the soil foundation are combined into a structural layer and used as a semi-infinite elastic foundation;
(4) judging whether the error amount between the second calculated deflection value and the first calculated deflection value is within a preset error amount range or not, if not, continuously adjusting the initial modulus of the crushed stone layer according to a preset correction rule, repeating the step (3) until the error amount between the second calculated deflection value and the first calculated deflection value is within the preset error range, and taking the adjusted initial modulus of the crushed stone layer as the elastic modulus of the crushed stone layer;
s5, testing the deflection of a plurality of deflection test points on the top surface of the beam field hardening layer by using a drop weight deflectometer to obtain a group of measured deflection basin data of the top surface of the beam field hardening layer;
s6, under the condition that the beam field hardened layer is regarded as a structural layer, the rockfill roadbed and the soil foundation are divided into a structural layer and are used as a semi-infinite elastic foundation, performing inverse calculation processing on the obtained group of actually measured deflection basin data to obtain the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the rockfill roadbed;
and S7, determining the thickness of the paved road surface structure based on the elastic modulus of the beam field hardened layer and the equivalent resilience modulus of the top surface of the stone-filled roadbed.
2. The process for determining the thickness of a pavement structure applied to a hardened layer of a beam field according to claim 1, wherein the step of continuously adjusting the initial modulus of the gravel layer according to a preset correction rule comprises:
(4-1) judging whether the second calculated deflection value is greater than the first calculated deflection value;
(4-2) if so, adding the preset modulus increase value to the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer;
and (4-3) if not, subtracting the preset modulus reduction value from the initial modulus of the crushed stone layer to obtain the adjusted initial modulus of the crushed stone layer.
3. The method of claim 1, wherein the step of obtaining the modulus of elasticity of the hardened layer of the beam yard and the equivalent modulus of resilience of the top surface of the rockfill subgrade by performing a back calculation process on the obtained set of measured deflection basin data comprises:
s221, establishing an error control relational expression between theoretical deflection basin data and actual measurement deflection basin data by adopting a nonlinear mechanical analysis model:
in the formula WiIs a theoretical deflection value of a deflection test point based on hj、Ej、μj、RjP and a are calculated as hjThickness of each structural layer, EjIs the modulus of elasticity, μ, of each structural layerjIs the Poisson's ratio, R, of the respective structural layersjThe distance from each sensor test point to the load center, P is the load applied by the falling weight deflectometer, a is the load action radius, m is the number of the sensor test points, j is the number of the structural layers, epsilon2Is the sum of the relative square errors between the measured deflection basin and the theoretical deflection basin, LiIs the measured deflection value, q, of the deflection test pointiA weighting coefficient is selected according to the fitting precision of the actually measured deflection basin data;
s222, inversely calculating to obtain the elastic modulus of the hardened layer of the beam field and the equivalent resilience modulus of the top surface of the rockfill roadbed based on the obtained group of actually measured deflection basin data and the error control relational expression.
4. The process for determining the structural thickness of a pavement structure applied to a hardened layer of a beam yard according to claim 1, wherein the step of testing the deflection of the plurality of deflection test points on the top surface of the hardened layer of the beam yard using a drop weight deflectometer to obtain a set of measured deflection basin data of the top surface of the hardened layer of the beam yard comprises:
s211, testing a plurality of deflection test points on the top surface of the beam field hardened layer by using a drop hammer deflectometer to obtain a deflection value of the top surface of the beam field hardened layer, and judging whether the deflection value of the top surface of the beam field hardened layer is greater than a preset deflection value checked and accepted on the top surface of the rockfill roadbed;
s212, if yes, grouting reinforcement is conducted on the beam field hardening layer;
and S213, repeating the step S211 and the step S212 until the deflection value of the top surface of the beam field hardened layer is smaller than or equal to the preset acceptance deflection value of the top surface of the stone-filled roadbed, and recording a set of measured deflection basin data obtained by the current drop hammer type deflectometer test so as to obtain a set of measured deflection basin data of the top surface of the beam field hardened layer.
5. The process for determining the structural thickness of a pavement to be applied to a beam field hardened layer according to claim 1, wherein the step of finishing the top surface of the beam field hardened layer after the pedestal is removed comprises:
s11, finishing the top surface of the beam field hardening layer to enable the road arch cross slope of the top surface of the beam field hardening layer to be 1% -2%.
6. The process for determining the structural thickness of a pavement to be paved on a beam field hardened layer according to claim 1, wherein the step of repairing the cracked portions of the top surface of the beam field hardened layer comprises:
s12, forming a plurality of rectangular grooves at intervals along the crack trend of the top surface of the beam field hardening layer;
s13, respectively inserting fixed connecting nails at two ends of the bottom of the rectangular groove along the length direction of the rectangular groove, and pouring concrete into the rectangular groove until the concrete is higher than the fixed connecting nails;
s14, placing a glass fiber net formed by glass fiber reinforcements at the top of the concrete poured in the rectangular groove, and pouring the concrete into the rectangular groove until the concrete is higher than the top of the glass fiber net;
and S15, placing hot-rolled ribbed steel bars on the tops of the concrete poured in the rectangular grooves, enabling the length direction of the hot-rolled ribbed steel bars to be consistent with the length of the rectangular grooves, and pouring the concrete into the rectangular grooves to the tops of the rectangular grooves.
7. The process for determining the thickness of a pavement structure applied to a hardened layer of a beam field according to claim 6, wherein the distance between the centers of adjacent rectangular grooves is 50 cm.
8. The process for determining the structural thickness of a pavement structure applied to a hardened layer of a beam field according to claim 1, wherein the mechanical software is bisar software.
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