CN115879196B - A method for rapidly evaluating the effect of dynamic compaction on coarse fill roadbed reinforcement - Google Patents
A method for rapidly evaluating the effect of dynamic compaction on coarse fill roadbed reinforcementInfo
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- CN115879196B CN115879196B CN202211516794.8A CN202211516794A CN115879196B CN 115879196 B CN115879196 B CN 115879196B CN 202211516794 A CN202211516794 A CN 202211516794A CN 115879196 B CN115879196 B CN 115879196B
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Abstract
The invention discloses a method for rapidly evaluating the dynamic compaction reinforcing effect of a coarse filler roadbed, which comprises the following specific steps of S1, obtaining accumulated compaction settlement of a coarse filler roadbed reinforced by dynamic compaction, S2, obtaining effective reinforcing depth, S3, obtaining initial compaction degree, S4, establishing a calculation model of the compaction degree in the effective reinforcing depth range of the coarse filler roadbed according to the obtained accumulated compaction settlement of the coarse filler roadbed, the effective reinforcing depth of the coarse filler roadbed and the initial compaction degree of the coarse filler in the dynamic compaction reinforcing area, S5, evaluating the reinforcing effect, and the rapid evaluation method for the dynamic compaction reinforcing effect of the coarse filler roadbed has strong practicability and overcomes the defect that the conventional method is difficult to evaluate the reinforcing effect of the coarse filler roadbed.
Description
Technical Field
The invention relates to the technical field of roadbed dynamic compaction reinforcement construction, in particular to a method for rapidly evaluating the dynamic compaction reinforcement effect of a coarse filler roadbed.
Background
The dynamic compaction reinforcement method is to freely drop a heavy hammer from a certain height to a foundation for impact and vibration, and generate larger contact stress at the contact moment of the hammer and the soil, wherein the contact stress is transmitted in the foundation soil below the hammer in the form of stress wave to cause the changes of the density, stress, pore water pressure and the like in the soil, thereby achieving the effects of improving the bearing capacity and strength of the foundation, eliminating the foundation collapsibility, controlling the post-construction sedimentation and uneven sedimentation of the foundation and the like.
The dynamic compaction method is widely applied to the reinforcement treatment of building foundations as a foundation treatment mode with wide application range, obvious reinforcement effect and simple construction machines, and is commonly used for evaluating the dynamic compaction reinforcement effect of the foundations by effective reinforcement depth. Most of the building foundations are homogeneous foundations, the effective reinforcement depth of dynamic compaction has a mature theoretical calculation formula, but for mountain area coarse filler highway foundations mainly comprising large-particle-size rubbles, the dynamic compaction reinforcement mechanism of the mountain area coarse filler highway foundations is obviously different from that of a general homogeneous building foundation due to poor uniformity of roadbed fillers and large gaps among fillers, and the effective reinforcement depth of the coarse filler roadbed cannot be obtained through actual measurement on site by using the existing theoretical calculation formula.
The effective reinforcement depth of the dynamic compaction is used as an index for evaluating the reinforcement effect of the dynamic compaction of the foundation or the roadbed, and the action area of the reinforcement effect of the dynamic compaction is shown. The corresponding physical and mechanical parameters of the soil body in the area are changed, but the change degree of the physical and mechanical parameters of the soil body in the effective reinforcement depth range is often difficult to quantitatively calculate. For a homogeneous building foundation, dynamic compaction reinforcement effect in the depth direction of a reinforcement area below a rammer is often evaluated by adopting a dynamic sounding test. However, for the mountain area coarse filler roadbed, the coarse filler roadbed has the characteristics of high filler strength, uneven particle size and the like, the surface layer below the rammer is a compact layer, the depth is difficult to advance, and the deep layer is provided with unbroken large stones, so that the detection work in the depth direction by adopting a gravity sounding test method is difficult to develop. Therefore, a method for rapidly evaluating the reinforcing effect of roadbed filler in the effective reinforcing depth range of the coarse filler roadbed dynamic compaction and the change rule of the compactness of the roadbed filler in the effective reinforcing depth direction is urgently needed.
Disclosure of Invention
The invention discloses a method for rapidly evaluating the dynamic compaction reinforcing effect of a coarse filler roadbed, and aims to solve the technical problem of how to overcome the defect that the conventional method is difficult to evaluate the dynamic compaction reinforcing effect of the coarse filler roadbed.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A method for rapidly evaluating dynamic compaction reinforcement effect of coarse filler roadbed comprises the following specific steps:
S1, acquiring accumulated ramming settlement of roadbed reinforced by dynamic compaction;
S2, obtaining effective reinforcement depth, namely obtaining effective reinforcement depth for reinforcing a coarse filler roadbed by dynamic compaction;
s3, obtaining initial compactness, namely obtaining initial compactness of coarse fillers in a reinforced area of the dynamic compaction application;
S4, establishing a calculation model, namely establishing a calculation model of the compaction degree of the dynamic compaction of the coarse filler roadbed within the effective reinforcement depth range according to the obtained dynamic compaction and reinforcement accumulated compaction amount of the coarse filler roadbed, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcement area;
and S5, evaluating the reinforcing effect, namely obtaining the distribution rule of the compactness along with the depth after the ramming of the coarse filler roadbed below the rammer by using the established calculation model, and evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed.
According to the obtained accumulated compaction amount of dynamic compaction reinforcement of the coarse filler roadbed, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcement area, a calculation model of the compaction degree of the coarse filler roadbed within the effective reinforcement depth range is established for evaluating the reinforcement effect, so that the method for rapidly evaluating the dynamic compaction reinforcement effect of the coarse filler roadbed has the advantages of being simple in principle, capable of calculating the compaction degree of roadbed filler within the effective reinforcement depth range of the dynamic compaction of the coarse filler roadbed, further calculating the compaction degree of roadbed filler at different depths below the rammer, capable of rapidly evaluating the reinforcement effect of the coarse filler roadbed, high in practicability and overcoming the defect that the conventional method is difficult to evaluate the reinforcement effect of the coarse filler roadbed.
In a preferred scheme, the step S1 is to obtain the accumulated tamper through carrying out a site coarse filler roadbed dynamic tamper reinforcement test, taking the average value of the tamper of two adjacent tamper as a weight receiving standard, and calculating the tamper reinforced accumulated tamper of the coarse filler roadbed after tamper stopping;
The method comprises the steps of S1, obtaining a site coarse filler roadbed dynamic compaction reinforcement test in the accumulated compaction settlement amount, wherein a ram with the radius of 1.15m and the weight of 17T is adopted, freely falls from a position higher than 17m, and measuring the settlement amount of each impact by using a level gauge;
S2, obtaining effective reinforcement depth through actually measuring dynamic compaction stress response processes at different depths in a coarse filler roadbed below a rammer in the dynamic compaction process and analyzing a dynamic stress peak value attenuation rule along with depth;
S2, in the effective reinforcement depth, dynamic stress response processes at different depths in the coarse filler subgrade below the rammer are obtained by embedding dynamic soil pressure boxes at corresponding depths below the rammer;
S3, obtaining initial compactness through indoor test analysis of crude filler obtained on site, and establishing a calculation model of the compactness in the effective reinforcement depth range of the dynamic compaction of the crude filler roadbed based on a roadbed filler volume strain epsilon V calculation formula;
S4, in the establishment of a calculation model, the area of effective reinforcement depth below the rammer is equivalent to a cylinder when dynamic compaction is carried out, coarse filler particles in the range of the cylinder are regarded as a huge unit body, the height of the cylinder is H, and the radius of the cylinder is the radius R of the rammer;
the method comprises the steps of S4, establishing a calculation model, wherein the parameters of a huge unit body below a rammer comprise a unit body volume V 0 before dynamic compaction, a dry density rho 0 and a compaction degree K 0, a unit body volume V 1 after dynamic compaction, the lateral deformation during the compression deformation of a soil body is not considered, a correction coefficient K is adopted in later calculation to consider the influence of the lateral deformation, the dry density rho 1, the compaction degree K 1, the maximum dry density rho max of coarse filler particles, the accumulated compaction and settlement H after the compaction is finished, and the parameters of the huge unit body below the rammer are expressed as V 0＝πR2H;V1＝πR2 (H-H);
s4, in the establishment of a calculation model, a compaction degree calculation formula of roadbed filling materials in the range of the effective reinforcement depth of the coarse filling roadbed dynamic compaction comprises:
S4, in the establishment of a calculation model, the distribution rule of compactness along with depth after ramming the coarse filler roadbed below the rammer is obtained through the following calculation:
h 1 is any depth in roadbed in dynamic compaction reinforced area, and H 1 is 1.4m, 1.9m, 2.4m, 2.9m, 3.4m, 3.9m, 4.4m, 4.9m, 5.4m, 5.9m and 6.4m in combination with accumulated compaction settlement of dynamic compaction.
The distribution rule of the compactness along with the depth is obtained by utilizing the established calculation model, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed can also be obtained, and the high consistency is achieved between the effective reinforcement depth and the actual effective reinforcement depth measured by the on-site dynamic compaction test, so that the validity and the correctness of the established evaluation calculation formula of the dynamic compaction reinforcement effect of the coarse filler roadbed, and the distribution rule of the compactness along with the depth of the coarse filler roadbed under the rammer after the dynamic compaction reinforcement are proved.
From the above, the method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed comprises the following specific steps:
S1, acquiring accumulated ramming settlement of roadbed reinforced by dynamic compaction;
S2, obtaining effective reinforcement depth, namely obtaining effective reinforcement depth for reinforcing a coarse filler roadbed by dynamic compaction;
s3, obtaining initial compactness, namely obtaining initial compactness of coarse fillers in a reinforced area of the dynamic compaction application;
S4, establishing a calculation model, namely establishing a calculation model of the compaction degree of the dynamic compaction of the coarse filler roadbed within the effective reinforcement depth range according to the obtained dynamic compaction and reinforcement accumulated compaction amount of the coarse filler roadbed, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcement area;
And S5, evaluating the reinforcing effect, namely obtaining the distribution rule of the compactness along with the depth after the ramming of the coarse filler roadbed below the rammer by using the established calculation model, and evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed. The method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed has the technical effects of being capable of rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed, having stronger practicability and overcoming the defect that the conventional method is difficult to evaluate the dynamic compaction reinforcing effect of the coarse filler roadbed.
Drawings
Fig. 1 is a schematic overall flow chart of a method for rapidly evaluating dynamic compaction reinforcement effect of a coarse filler roadbed.
Fig. 2 is a curve of the dynamic compaction and reinforcement accumulated tamper settlement of the coarse filler roadbed along with the number of the impact impacts, which is used for rapidly evaluating the dynamic compaction and reinforcement effect of the coarse filler roadbed.
Fig. 3 is a schematic diagram of embedding a dynamic soil pressure box for dynamic stress response collection in a roadbed below a rammer in a dynamic compaction reinforcement process of the method for rapidly evaluating the dynamic compaction reinforcement effect of a coarse filler roadbed.
Fig. 4 is a graph showing the variation of dynamic stress peak value with depth in the coarse material roadbed under the rammer of the method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse material roadbed.
Fig. 5 is a schematic diagram of a calculation model of the compaction degree of the roadbed coarse filler in an effective reinforcement depth area after dynamic compaction reinforcement by the method for rapidly evaluating the dynamic compaction reinforcement effect of the coarse filler roadbed.
Fig. 6 is a schematic diagram showing the distribution rule of the degree of compaction of the roadbed coarse filler under the rammer after dynamic compaction reinforcement along with the depth according to the method for rapidly evaluating the dynamic compaction reinforcement effect of the coarse filler roadbed.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
The method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed is mainly applied to the scene of rapidly predicting the dynamic compaction reinforcing effect of the coarse filler roadbed.
Referring to fig. 1, a method for rapidly evaluating the dynamic compaction reinforcing effect of a coarse filler roadbed comprises the following specific steps:
S1, acquiring accumulated ramming settlement of roadbed reinforced by dynamic compaction;
S2, obtaining effective reinforcement depth, namely obtaining effective reinforcement depth for reinforcing a coarse filler roadbed by dynamic compaction;
s3, obtaining initial compactness, namely obtaining initial compactness of coarse fillers in a reinforced area of the dynamic compaction application;
S4, establishing a calculation model, namely establishing a calculation model of the compaction degree of the dynamic compaction of the coarse filler roadbed within the effective reinforcement depth range according to the obtained dynamic compaction and reinforcement accumulated compaction amount of the coarse filler roadbed, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcement area;
And S5, evaluating the reinforcing effect, namely obtaining a distribution rule of the compaction degree of the rammed coarse filler roadbed under the rammer along with the depth by using the established calculation model, evaluating the reinforcing effect of the coarse filler roadbed, and establishing a calculation model of the compaction degree of the coarse filler roadbed in the effective reinforcing depth range of the dynamic compaction of the coarse filler roadbed according to the obtained accumulated compaction settlement amount of the dynamic compaction reinforcement of the coarse filler roadbed, the effective reinforcing depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcing area.
Referring to fig. 1 and 2, in a preferred embodiment, S1, the cumulative tamper is obtained by performing a dynamic compaction reinforcement test on a site coarse filler roadbed, taking the average value of the tamper of two adjacent tamper weights as a tamper receiving standard, calculating the dynamic compaction reinforcement cumulative tamper of the coarse filler roadbed after tamper stopping, as shown in fig. 2, at a certain tamper energy level provided on the site, the cumulative tamper of the dynamic compaction is gradually increased along with the increase of the tamper number and is stable in area, and the average value of the tamper of two adjacent tamper weights is less than 5cm as a tamper stopping standard, and calculating the cumulative tamper h of the tamper pit after tamper stopping.
Referring to fig. 1, in a preferred embodiment, S1, the dynamic compaction test for obtaining the on-site coarse filler roadbed in the accumulated compaction settlement amount is to use a rammer with a radius of 1.15m and a weight of 17T, freely fall from a height of 17m, and measure the settlement amount of each impact by using a level gauge.
Referring to fig. 1, in a preferred embodiment, S2, the effective reinforcement depth is obtained by measuring dynamic stress response processes at different depths in the coarse filler subgrade under the ram during dynamic compaction, and analyzing the dynamic stress peak value attenuation law with depth.
Referring to fig. 1,3 and 4, in a preferred embodiment, S2, the effective reinforcement depth is obtained by measuring the dynamic stress response process at different depths in the coarse filler subgrade below the ram by embedding the dynamic soil pressure boxes at corresponding depths below the ram, as shown in fig. 3, embedding the first strain-type dynamic soil pressure box at 1.0m below the ram, and then embedding 10 strain-type dynamic soil pressure boxes at intervals of 0.5m, as shown in fig. 4, and as the depth increases, the dynamic compaction stress rapidly decays from 320kPa at 1.0m below the ram to 1kPa at 6.0m below the ram, indicating that the compaction effect of the vibration shock wave on the soil body below the ram gradually weakens with the increase of the depth, and if taking 10kPa as a boundary, as can be seen from fig. 4, the vertical effective reinforcement depth is about 5.0m when the ram energy 3000kn·m acts.
Referring to fig. 1, in a preferred embodiment, S3, the initial compaction degree is obtained by taking the coarse filler on site and performing an indoor test analysis, and the calculation model of the compaction degree in the effective reinforcement depth range of the coarse filler roadbed dynamic compaction is established based on the calculation formula of the roadbed filler volume strain epsilon V.
Referring to fig. 1, in a preferred embodiment, S4, in the establishment of the calculation model, the area of effective reinforcement depth under the rammer when the dynamic compaction is performed is equivalent to a cylinder, coarse filler particles in the range of the cylinder are regarded as a huge unit body, the height of the cylinder is H, and the radius is the radius R of the rammer.
Referring to fig. 1,5 and 6, in a preferred embodiment, in S4, a calculation model is built, and the parameters of the large unit under the rammer include a unit volume before dynamic compaction V 0, a dry density ρ 0, a compactness K 0, a unit volume after dynamic compaction V 1, in which the influence of the lateral deformation is not considered when the soil is compressively deformed, a correction coefficient K is used in later calculation to consider the influence of the lateral deformation, a dry density ρ 1, a compactness K 1, a maximum dry density ρ max of coarse filler particles, an accumulated compaction H after the compaction is finished, and the parameters of the large unit under the rammer are expressed as V 0＝πR2H;V1＝πR2 (H-H).
Referring to fig. 1 and 3, in a preferred embodiment, S4, a calculation formula of the compactness of the roadbed filler in the effective reinforcement depth range of the coarse filler roadbed dynamic compaction includes:
referring to fig. 1 and 3, in a preferred embodiment, S4, in the building of the calculation model, the distribution rule of the compaction degree with the depth after the ramming of the coarse filler roadbed under the rammer is obtained by the following formula:
H 1 is any depth of roadbed in the dynamic compaction reinforced area, and H 1 is 1.4m, 1.9m, 2.4m, 2.9m, 3.4m, 3.9m, 4.4m, 4.9m, 5.4m, 5.9m and 6.4m combined with the accumulated compaction settlement of the dynamic compaction, and the dynamic compaction effective reinforced depth of the coarse filler roadbed can be obtained by utilizing a distribution rule of compaction degree along with the depth by establishing a calculation model, and has higher anastomosis with the actual measured effective reinforced depth of the on-site dynamic compaction test, so that the effectiveness and correctness of the evaluation calculation formula of the dynamic compaction reinforced effect of the coarse filler roadbed under the obtained dynamic compaction reinforced roadbed are proved.
Embodiment one:
the method for rapidly evaluating the dynamic compaction reinforcement effect of the coarse filler roadbed provided by the embodiment of the invention is used for evaluating and analyzing the dynamic compaction reinforcement effect of the coarse filler roadbed of a certain expressway.
The section of the planned expressway is positioned in Xingyi city of Guizhou province, the roadbed filler of the expressway adopts tunnel cutting excavation block stones, the particle size of the block stones is mostly 40cm-70cm, the maximum particle size is close to 1m, and the uniformity of the roadbed coarse filler is extremely poor. In order to control the post-construction settlement of the coarse filler high embankment, the coarse filler roadbed is reinforced by adopting a dynamic compaction method (the ramming energy level is 3000 kN.m).
In order to evaluate the dynamic compaction reinforcing effect of the coarse filler roadbed, the relevant parameters are obtained by combining the attached figures 2-6 as shown in the following table:
The accumulated settlement after the dynamic compaction of a highway filled-stone embankment is completed is 0.932m, the effective reinforcement depth is 5.0m, the lateral deformation of the filler under the action of the dynamic compaction is considered to be generally smaller, the correction coefficient k is 0.90, the compactness of the embankment before the compaction is 80%, the compactness of the coarse filler in the effective reinforcement depth area after the compaction is obtained through substitution calculation is 97.2 to 93%, and the requirement of the current specification is met.
In addition, from the distribution rule of the compactness of the roadbed coarse filler under the rammer along with the depth after the dynamic compaction and reinforcement of the dynamic compaction of the figure 6, the effective reinforcement depth of the coarse filler roadbed can be rapidly obtained to be about 5.4m by taking the compactness as a limit, and the effective reinforcement depth is basically consistent with the actual measurement result on site. In the similar roadbed or foundation dynamic compaction reinforcement engineering, the method provided by the invention can be utilized to rapidly obtain the distribution rule of the packing compaction degree along with the depth after the compaction under the rammer as long as the accumulated compaction amount of the dynamic compaction and the initial compaction degree of the packing are obtained, so that the effective reinforcement depth of the dynamic compaction is obtained.
Working principle: when the dynamic compaction reinforcement effect of the on-site roadbed is evaluated, the accumulated compaction settlement of the dynamic compaction reinforcement pit of the coarse-filler roadbed and the inherent effective reinforcement depth are measured through the on-site test, the initial compaction degree of the coarse filler of the roadbed is combined, a post-compaction roadbed coarse filler compaction degree evaluation model of the coarse filler of the coarse-filler roadbed in the dynamic compaction reinforcement area is built according to a volumetric strain calculation formula, the compaction degree of the coarse filler in the effective reinforcement area after the dynamic compaction reinforcement is finally calculated, the distribution rule of the coarse filler compaction degree of the roadbed under the dynamic compaction hammer with the depth is obtained, the dynamic compaction reinforcement effect of the coarse filler roadbed is comprehensively evaluated, the method principle of the rapid evaluation of the dynamic compaction reinforcement effect of the coarse filler roadbed is simple, the defect that the conventional method is difficult to detect the dynamic compaction reinforcement effect of the coarse filler roadbed is overcome, the method is capable of rapidly calculating the effective compaction degree of the coarse filler of the roadbed with the coarse filler of the area, the effective compaction depth is obtained according to the distribution rule of the compaction degree with the depth, the effective compaction depth of the dynamic compaction roadbed can be obtained according to the method, the effective reinforcement depth of the dynamic compaction hammer of the coarse filler is obtained, and the dynamic compaction reinforcement rule of the dynamic compaction hammer of the coarse filler is obtained according to the actual measurement rule of the dynamic compaction roadbed is obtained according to the actual measurement rule, and the dynamic compaction rule of the dynamic compaction rule is obtained after the dynamic compaction rule is obtained according to the actual measurement, and the dynamic compaction rule is obtained.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (2)
1. The method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed is characterized by comprising the following specific steps of:
S1, acquiring accumulated ramming settlement of roadbed reinforced by dynamic compaction;
S2, obtaining effective reinforcement depth, namely obtaining effective reinforcement depth for reinforcing a coarse filler roadbed by dynamic compaction;
s3, obtaining initial compactness, namely obtaining initial compactness of coarse fillers in a reinforced area of the dynamic compaction application;
S4, establishing a calculation model, namely establishing a calculation model of the compaction degree of the dynamic compaction of the coarse filler roadbed within the effective reinforcement depth range according to the obtained dynamic compaction and reinforcement accumulated compaction amount of the coarse filler roadbed, the effective reinforcement depth of the dynamic compaction of the coarse filler roadbed and the initial compaction degree of the coarse filler in the application dynamic compaction reinforcement area;
s5, evaluating the reinforcing effect, namely obtaining a distribution rule of compactness along with depth after tamping the coarse filler roadbed below the rammer by using the established calculation model, and evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed;
The method comprises the steps that S1, accumulated ramming settlement is obtained by carrying out on-site coarse filler roadbed dynamic compaction reinforcement test, taking the average value of the ramming settlement of two adjacent ramming settlement as a hammer collecting standard, and calculating the accumulated ramming settlement of coarse filler roadbed dynamic compaction reinforcement after ramming stop;
The method comprises the steps of S1, obtaining a site coarse filler roadbed dynamic compaction reinforcement test in the accumulated compaction settlement amount, wherein a ram with the radius of 1.15m and the weight of 17T is adopted, freely falls from a position higher than 17m, and measuring the settlement amount of each impact by using a level gauge;
S2, obtaining effective reinforcement depth through actually measuring dynamic compaction stress response processes at different depths in a coarse filler roadbed below a rammer in the dynamic compaction process and analyzing a dynamic stress peak value attenuation rule along with depth;
S2, in the effective reinforcement depth, dynamic stress response processes at different depths in the coarse filler subgrade below the rammer are obtained by embedding dynamic soil pressure boxes at corresponding depths below the rammer;
S3, obtaining initial compactness through indoor test analysis of crude filler obtained on site, and establishing a calculation model of the compactness in the effective reinforcement depth range of the dynamic compaction of the crude filler roadbed based on a roadbed filler volume strain epsilon V calculation formula;
S4, in the establishment of a calculation model, the area of effective reinforcement depth below the rammer is equivalent to a cylinder when dynamic compaction is carried out, coarse filler particles in the range of the cylinder are regarded as a huge unit body, the height of the cylinder is H, and the radius of the cylinder is the radius R of the rammer;
The method comprises the following steps of S4, establishing a calculation model, wherein the parameters of a huge unit body below a rammer comprise a unit body volume V 0 before dynamic compaction, a dry density rho 0, a compactness K 0, a unit body volume V 1 after dynamic compaction, a dry density rho 1, a compactness K 1, a maximum dry density rho max of coarse filler particles, an accumulated ramming settlement H after the ramming is finished, and the parameters of the huge unit body below the rammer are expressed as V 0=πR2H;V1=πR2 (H-H);
s4, in the establishment of a calculation model, a compaction degree calculation formula of roadbed filling materials in the range of the effective reinforcement depth of the coarse filling roadbed dynamic compaction comprises:
;;;;。
2. The method for rapidly evaluating the dynamic compaction reinforcing effect of the coarse filler roadbed according to claim 1, wherein the step S4 is that in the establishment of a calculation model, the distribution rule of the compaction degree with depth after the coarse filler roadbed under the rammer is obtained by the following calculation:
Wherein H 1 is any depth in roadbed in dynamic compaction reinforced area, and H 1 is 1.4m, 1.9m, 2.4m, 2.9m, 3.4m, 3.9m, 4.4m, 4.9m, 5.4m, 5.9m and 6.4m in combination with accumulated compaction settlement of dynamic compaction.
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