A high liquid limit soil subgrade partition filling construction method in a tropical rainy area

Abstract

The present application relates to the technical field of road engineering construction, in particular to a kind of hot and rainy area high liquid limit soil roadbed partition filling construction method, comprising the following steps: S1, obtaining roadbed information, moisture content, partition determines compaction degree and filling mode;S2, high liquid limit soil is exposed to the sun, according to moisture content deviation determination condition;S3, layer filling compaction, calculate compaction degree and determine;S4, compare cement dosage compaction degree, determine dosage improvement;S5, form roadbed, compare deflection value and design limit, evaluate quality.The present application, by constructing high liquid limit soil roadbed partition filling control scheme for different bearing requirements, combined with moisture content dynamic control, partition compaction degree determination, cement external dosage optimization and roadbed deflection comprehensive evaluation, realizes the differential filling of high liquid limit soil in hot and rainy area, in-situ utilization and whole-process control of construction quality, improves the bearing reliability of roadbed, shortens the construction period and reduces the improvement cost.

Description

Technical Field

[0001] This invention relates to the field of road engineering construction technology, and in particular to a method for zonal filling construction of roadbeds with high liquid limit soil in tropical rainy areas. Background Technology

[0002] As highway construction extends into tropical and rainy regions, projects frequently encounter high-liquid-limit soils formed from strongly weathered basalt and other similar materials. These soils typically exhibit high clay content, strong water retention, high natural moisture content, and their water content is significantly affected by rainfall. Under conditions of continuous rainfall or rainy season construction, it is difficult to rapidly reduce the water content to the optimal compaction moisture level. How to rationally utilize high-liquid-limit soils at different roadbed depths, while ensuring the compaction quality and overall bearing capacity after filling, has become a key issue that needs to be addressed in roadbed construction in tropical and rainy regions.

[0003] Current construction methods for high liquid limit soil subgrades typically employ uniform compaction standards or improvement methods, lacking differentiated consideration of bearing capacity requirements, compaction control requirements, and the actual moisture content of the high liquid limit soil at different subgrade depths. When the natural moisture content is high, prolonged drying is often required, impacting construction progress during the rainy season. Using cement and other materials for overall improvement can easily increase the amount of admixtures and construction costs. Furthermore, current construction processes lack continuous correlation control between indicators such as fill moisture content, actual compaction degree, cement admixture dosage, and subgrade deflection, making it difficult to simultaneously consider the on-site utilization of high liquid limit soil, zonal compaction quality, and overall subgrade bearing capacity. Summary of the Invention

[0004] This invention provides a method for zonal filling construction of roadbeds with high liquid limit soil in tropical rainy areas. The method divides the roadbed into zones according to the bearing requirements and compaction control requirements corresponding to different depths. It also determines the direct filling or cement-modified filling method based on the water content of the high liquid limit soil. Targeted construction of each zone is achieved through moisture content control, layered compaction, compaction determination, and determination of cement admixture dosage. Furthermore, the overall roadbed bearing capacity is evaluated by using the representative value of subgrade deflection and the design deflection limit value, thereby improving the on-site utilization of high liquid limit soil and the quality of roadbed construction, while taking into account both construction efficiency during the rainy season and the cost of modified construction.

[0005] A method for zonal filling construction of roadbeds with high liquid limit soil in tropical rainy areas includes the following steps:

[0006] S1. Obtain the design information of the subgrade to be constructed, as well as the natural moisture content and optimum moisture content of the high liquid limit soil. Divide the subgrade into subgrade zones according to the bearing requirements and compaction control requirements corresponding to different depths of the subgrade. Determine the target compaction degree of each subgrade zone. Determine the filling treatment method of each subgrade zone according to the moisture content deviation between the natural moisture content and the optimum moisture content. Generate the subgrade zone filling control scheme.

[0007] S2, Based on the roadbed zoning filling control scheme, determine the direct filling area, turn over and dry the high liquid limit soil, obtain the real-time moisture content and calculate the moisture content control deviation between it and the target filling moisture content, and judge whether the high liquid limit soil meets the filling conditions based on the moisture content control deviation, and obtain the high liquid limit soil that meets the filling conditions.

[0008] S3, the high liquid limit soil that meets the filling conditions is used to fill and compact the direct filling area in layers. The actual compaction degree is calculated based on the dry density on site and the maximum dry density after compaction. The actual compaction degree is compared with the target compaction degree to obtain the direct filling area that meets the compaction requirements.

[0009] S4. Based on the roadbed zoning filling control scheme, the improved filling area is determined, the compaction degree of high liquid limit soil corresponding to different cement admixture dosages is obtained, and compared with the target compaction degree, the cement admixture dosage that meets the target compaction degree is determined, and the high liquid limit soil is improved, mixed, leveled and compacted using the determined cement admixture dosage to obtain the improved filling area that meets the compaction requirements.

[0010] S5. Based on the directly filled area and the improved filled area, an integral subgrade is formed. Subgrade deflection detection data is obtained and the representative value of subgrade deflection is calculated. The representative value of subgrade deflection is compared with the design deflection limit. The bearing capacity of the integral subgrade is determined according to the comparison result, and the subgrade zonal filling construction quality evaluation result is obtained.

[0011] Optionally, S1 includes:

[0012] S11, Obtain the design information of the roadbed to be constructed. The design information includes the roadbed structure depth, the bearing requirements and compaction control requirements corresponding to each depth range, and obtain high liquid limit soil samples for roadbed filling. Determine the natural moisture content and optimum moisture content of the high liquid limit soil, and correlate the roadbed structure depth, bearing requirements, compaction control requirements, natural moisture content and optimum moisture content to form roadbed zoning basic data.

[0013] S12, Based on the roadbed zoning basic data, according to the bearing requirements and compaction control requirements corresponding to the roadbed structure depth, the roadbed to be constructed is divided into different roadbed zones, and the compaction control requirements corresponding to each roadbed zone are determined as the target compaction, and the correspondence between roadbed zones, bearing requirements and target compaction is established;

[0014] S13. Based on the correspondence between the subgrade zoning, bearing requirements and target compaction degree, calculate the moisture content deviation between the natural moisture content and the optimum moisture content of the high liquid limit soil, and determine the corresponding filling treatment method in combination with the target compaction degree of each subgrade zoning. Associate each subgrade zoning, target compaction degree, moisture content deviation and filling treatment method to generate a subgrade zoning filling control scheme.

[0015] Optionally, S12 includes:

[0016] S121, Based on the roadbed zoning basic data, the bearing requirements and compaction control requirements corresponding to each depth position are extracted in the order of roadbed structure depth. The bearing requirements and compaction control requirements of adjacent depth positions are compared. When the bearing requirements or compaction control requirements corresponding to adjacent depth positions change, the corresponding depth position is determined as the zoning boundary, and the roadbed to be constructed is divided into multiple roadbed zoning according to each zoning boundary.

[0017] S122, For each subgrade zone obtained by division, extract the bearing requirements and compaction control requirements corresponding to each subgrade zone, and determine the compaction control requirements of the subgrade zone as its target compaction, so that different subgrade zones have target compaction corresponding to their own bearing requirements;

[0018] S123 associates the location of each subgrade zone, the corresponding bearing requirements, and the target compaction degree, and establishes a one-to-one correspondence with the subgrade zone as an index to form a subgrade zone control relationship for determining the filling treatment method of high liquid limit soil.

[0019] Optionally, S13 includes:

[0020] S131, obtain the natural moisture content and optimum moisture content of the high liquid limit soil, calculate the difference between the natural moisture content and the optimum moisture content, and take the absolute value of the difference to obtain the moisture content deviation, which characterizes the degree to which the current moisture content of the high liquid limit soil deviates from the optimum compaction moisture content.

[0021] S132, based on the correspondence between the subgrade zoning, bearing requirements and target compaction degree, the target compaction degree of each subgrade zoning is obtained respectively. Combined with the moisture content deviation and the field test compaction results of high liquid limit soil under different filling treatment methods, the filling treatment method of each subgrade zoning is matched. The subgrade zoning that achieves the corresponding target compaction degree through moisture content control and direct compaction is determined as the direct filling area, and the subgrade zoning that achieves the corresponding target compaction degree through cement improvement is determined as the improved filling area.

[0022] S133 associates each subgrade zone with the corresponding target compaction degree, moisture content deviation, and filling treatment method. It sets high liquid limit soil moisture content control and direct compaction requirements for direct filling areas, and sets cement improvement and compaction requirements for modified filling areas, thus forming a subgrade zone filling control scheme to guide the filling construction of each subgrade zone.

[0023] Optionally, S2 includes:

[0024] S21. Based on the roadbed zoning filling control scheme, extract the roadbed zoning with the filling treatment method of direct filling, determine the corresponding roadbed zoning as the direct filling area, and obtain the target filling moisture content requirement corresponding to the direct filling area as the basis for moisture content control of high liquid limit soil drying treatment.

[0025] S22, the high liquid limit soil used for the direct filling area is turned over and dried. During the turning and drying process, the real-time moisture content of the high liquid limit soil is obtained, and the moisture content control deviation between the real-time moisture content and the target filling moisture content corresponding to the direct filling area is calculated to obtain the moisture content control deviation reflecting the difference between the current moisture content of the high liquid limit soil and the filling requirements.

[0026] S23, compare the moisture content control deviation with the allowable moisture content deviation threshold of the corresponding direct filling area. When the moisture content control deviation is not greater than the allowable moisture content deviation threshold, determine that the current high liquid limit soil meets the filling conditions of the corresponding direct filling area. When the moisture content control deviation is greater than the allowable moisture content deviation threshold, continue to turn the high liquid limit soil over and dry it until the filling conditions are met, and obtain high liquid limit soil that meets the filling conditions.

[0027] Optionally, S3 includes:

[0028] S31, the high liquid limit soil that meets the filling conditions is used to fill each direct filling area in layers, and each filling layer is compacted according to the compaction requirements of the corresponding direct filling area. After compaction is completed, the in-situ wet density and real-time moisture content of the high liquid limit soil of each filling layer are obtained, and the in-situ dry density of the corresponding filling layer is calculated based on the in-situ wet density and real-time moisture content.

[0029] S32, obtain the maximum dry density of high liquid limit soil determined by compaction test, calculate the ratio of the on-site dry density to the maximum dry density, and obtain the actual compaction degree of the filling layer corresponding to each direct filling area, which is used to characterize the degree to which high liquid limit soil reaches the maximum compaction state after rolling.

[0030] S33, compare the actual compaction degree of the corresponding filling layer in each direct filling area with the determined corresponding target compaction degree. When the actual compaction degree is not lower than the target compaction degree, it is determined that the corresponding filling layer meets the compaction requirements. When the actual compaction degree is lower than the target compaction degree, the corresponding filling layer is continued to be rolled and the actual compaction degree is re-tested until the target compaction requirements are met, thus obtaining a direct filling area that meets the compaction requirements.

[0031] Optionally, S4 includes:

[0032] S41, Based on the roadbed zoning filling control scheme, extract the roadbed zoning with cement-modified filling as the filling treatment method, determine the corresponding roadbed zoning as the modified filling area, and obtain the target compaction degree corresponding to the modified filling area. At the same time, set multiple different cement admixture dosages, and conduct compaction tests on the high liquid limit soil corresponding to each cement admixture dosage to obtain the field dry density corresponding to each cement admixture dosage.

[0033] S42, compare the compaction degree of high liquid limit soil corresponding to each cement admixture dosage with the target compaction degree of the improved filling area, screen the cement admixture dosage with a compaction degree not lower than the target compaction degree, and determine the cement admixture dosage with the smaller admixture dosage from the cement admixture dosage that meets the target compaction requirement as the target cement admixture dosage.

[0034] S43, Cement is added to the high liquid limit soil used to improve the filling area according to the target cement admixture dosage. The moisture content of the cement-improved high liquid limit soil is controlled, mixed and leveled. The leveled high liquid limit soil is then rolled to obtain the actual compaction degree. The actual compaction degree is compared with the target compaction degree of the improved filling area. When the actual compaction degree reaches the target compaction degree, it is determined that the corresponding improved filling area meets the compaction requirements, and an improved filling area that meets the compaction requirements is obtained.

[0035] Optionally, S5 includes:

[0036] S51, Based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, the subgrade is deflected and tested. Subgrade deflection test data corresponding to different test locations are obtained. The subgrade deflection test data are summarized to obtain a representative value of subgrade deflection used to characterize the deformation response of the integral subgrade.

[0037] S52, obtain the design deflection limit value corresponding to the subgrade to be constructed, compare the representative value of the subgrade deflection with the design deflection limit value, determine whether the overall subgrade bearing capacity meets the design requirements based on the comparison result, and obtain the subgrade zonal filling construction quality evaluation result by combining the compaction results of the direct filling area and the improved filling area.

[0038] Optionally, S51 includes:

[0039] S511, Based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, multiple deflection detection positions are set for the subgrade, and the deflection detection values ​​corresponding to each deflection detection position are obtained. The deflection detection values ​​are summarized according to the detection positions to form a subgrade deflection detection dataset.

[0040] S512, Based on the roadbed deflection detection dataset, the deflection detection values ​​corresponding to each deflection detection location are statistically analyzed, the arithmetic mean of the roadbed deflection is calculated, and the minimum and maximum deflection values ​​of a single point in the roadbed deflection detection dataset are determined to obtain the roadbed deflection summary index.

[0041] S513, Based on the roadbed deflection detection dataset and the roadbed deflection summary index, the deflection detection values ​​at each detection location are comprehensively processed according to the evaluation rules adopted for roadbed deflection detection to determine the representative value of roadbed deflection used to characterize the overall roadbed deformation response and bearing capacity.

[0042] Optionally, S52 includes:

[0043] S521, obtain the design deflection limit specified in the design document of the roadbed to be constructed, and establish a correspondence between the design deflection limit and the representative value of the roadbed deflection to form a set of parameters for determining the bearing capacity of the overall roadbed;

[0044] S522, compare the representative value of the subgrade deflection with the design deflection limit. When the representative value of the subgrade deflection is not greater than the design deflection limit, it is determined that the overall subgrade bearing capacity meets the design requirements. When the representative value of the subgrade deflection is greater than the design limit, it is determined that the overall subgrade bearing capacity does not meet the design requirements, and the overall subgrade bearing capacity determination result is obtained.

[0045] S523, obtain the compaction requirement judgment results of each direct filling area and improved filling area, and conduct a comprehensive evaluation in combination with the overall subgrade bearing capacity judgment results. When each direct filling area and improved filling area meets the corresponding target compaction requirements and the overall subgrade bearing capacity meets the design requirements, the subgrade zonal filling construction quality is judged to be qualified; otherwise, the subgrade zonal filling construction quality is judged to be unqualified, and the subgrade zonal filling construction quality evaluation result is obtained.

[0046] The beneficial effects of this invention are:

[0047] This invention divides the subgrade into zones based on the bearing capacity and compaction control requirements corresponding to the subgrade structure depth. It also combines the moisture content deviation between the natural and optimum moisture content of high liquid limit soil and the compaction results from field tests to match direct filling or cement-modified filling methods for different subgrade zones. This forms a subgrade zoning filling control scheme, which achieves targeted matching of high liquid limit soil filling methods with the bearing capacity requirements of different subgrade areas. This reduces the impact of high moisture content on subgrade construction in tropical rainy environments and improves the on-site utilization capacity of high liquid limit soil.

[0048] This invention involves drying and real-time moisture content testing of high liquid limit soil in the direct filling area. Filling conditions are determined based on moisture content control deviations. During layered filling and compaction, the actual compaction degree is calculated based on the on-site dry density and maximum dry density. The actual compaction degree is compared with the target compaction degree, achieving continuous control from controlling the moisture content before filling to determining the compaction state after filling. Furthermore, for improved filling areas, by comparing the compaction degree of high liquid limit soil corresponding to different cement admixture dosages, a smaller cement admixture dosage is determined while meeting the target compaction degree. This helps to balance the quality of subgrade compaction with the amount of cement used, reducing the cost of improved construction.

[0049] This invention forms an integral roadbed after the compaction requirements of the direct filling area and the modified filling area are met. Deflection is measured at different test locations of the roadbed to determine the representative value of the roadbed deflection. The representative value of the roadbed deflection is compared with the design deflection limit to evaluate the overall roadbed bearing capacity. Furthermore, the compaction requirement judgment results of each direct filling area and the modified filling area are combined to form the roadbed zonal filling construction quality evaluation results. This achieves joint verification of zonal compaction quality and overall bearing capacity, improving the completeness and reliability of the zonal filling construction quality evaluation of roadbeds with high liquid limit soil in tropical rainy areas. Attached Figure Description

[0050] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This is a schematic diagram of the construction method according to an embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Those skilled in the art may employ other alternative methods to implement some well-known technologies; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0053] like Figure 1 As shown, a method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas includes the following steps:

[0054] S1. Obtain the design information of the subgrade to be constructed, as well as the natural moisture content and optimum moisture content of the high liquid limit soil. Divide the subgrade into subgrade zones according to the bearing requirements and compaction control requirements corresponding to different depths of the subgrade. Determine the target compaction degree of each subgrade zone. Determine the filling treatment method of each subgrade zone according to the moisture content deviation between the natural moisture content and the optimum moisture content. Generate the subgrade zone filling control scheme.

[0055] S2. Based on the subgrade zoning filling control scheme, the direct filling area is determined. The high liquid limit soil is turned over and dried to obtain the real-time moisture content and calculate the moisture content control deviation between it and the target filling moisture content. Based on the moisture content control deviation, it is determined whether the high liquid limit soil meets the filling conditions, and the high liquid limit soil that meets the filling conditions is obtained.

[0056] S3, using high liquid limit soil that meets the filling conditions to fill the direct filling area in layers and compact it, calculate the actual compaction degree based on the dry density on site and the maximum dry density after compaction, compare the actual compaction degree with the target compaction degree to obtain the direct filling area that meets the compaction requirements;

[0057] S4. Based on the subgrade zoning filling control scheme, the improved filling area is determined, the compaction degree of high liquid limit soil corresponding to different cement admixture dosages is obtained, and compared with the target compaction degree. The cement admixture dosage that meets the target compaction degree is determined. The determined cement admixture dosage is used to improve, mix, level and compact the high liquid limit soil to obtain the improved filling area that meets the compaction requirements.

[0058] S5. Based on the direct filling area and the improved filling area, an integral subgrade is formed. Subgrade deflection test data is obtained and the representative value of subgrade deflection is calculated. The representative value of subgrade deflection is compared with the design deflection limit. Based on the comparison results, the overall subgrade bearing capacity is determined, and the subgrade zonal filling construction quality evaluation results are obtained.

[0059] S1 includes:

[0060] S11. Obtain the design information of the subgrade to be constructed. The design information includes the subgrade structural depth, the bearing requirements and compaction control requirements for each depth range, and simultaneously obtain high liquid limit soil samples for subgrade filling. Determine the natural moisture content and optimum moisture content of the high liquid limit soil. Correlate the subgrade structural depth, bearing requirements, compaction control requirements, natural moisture content, and optimum moisture content to form subgrade zoning basic data, represented as follows:

[0061] ;

[0062] in, The natural water content of high liquid limit soil, This refers to the natural state mass of the high liquid limit soil sample. The mass of the same high liquid limit soil sample after drying;

[0063] S12. Based on the subgrade zoning data, the subgrade to be constructed is divided into different subgrade zones according to the bearing requirements and compaction control requirements corresponding to the subgrade structure depth. The compaction control requirements corresponding to each subgrade zone are determined as the target compaction, and the correspondence between subgrade zones, bearing requirements and target compaction is established.

[0064] S13. Based on the correspondence between subgrade zoning, bearing requirements and target compaction degree, calculate the moisture content deviation between the natural moisture content and the optimum moisture content of high liquid limit soil, and determine the corresponding filling treatment method in combination with the target compaction degree of each subgrade zoning. Link each subgrade zoning, target compaction degree, moisture content deviation and filling treatment method to generate subgrade zoning filling control scheme.

[0065] S12 includes:

[0066] S121, based on the subgrade zoning baseline data, the bearing capacity requirements and compaction control requirements corresponding to each depth are extracted according to the subgrade structural depth sequence. The bearing capacity requirements and compaction control requirements of adjacent depths are compared. When the bearing capacity requirements or compaction control requirements of adjacent depths change, the corresponding depth is determined as the zoning boundary. Based on each zoning boundary, the subgrade to be constructed is divided into multiple subgrade zones, represented as follows:

[0067] ;

[0068] in, For the first Partition boundary determination value at each depth location This indicates that the depth location is determined as the partition boundary. This indicates that the depth position does not constitute a partition boundary. For the first The load-bearing requirements corresponding to each depth position In order to be with the first The load-bearing requirements corresponding to the previous depth position adjacent to each depth position. For the first The compaction control requirements corresponding to each depth location The compaction control requirements are for the previous depth position;

[0069] S122, for each subgrade zone obtained from the division, extract the bearing capacity requirement and compaction control requirement corresponding to each subgrade zone, and determine the compaction control requirement of the subgrade zone as its target compaction, so that different subgrade zones have target compaction corresponding to their own bearing capacity requirements, expressed as:

[0070] ;

[0071] in, For the first The target compaction degree for each roadbed zone For the first Compaction control requirements for each subgrade zone;

[0072] S123 associates the location, corresponding bearing requirements, and target compaction degree of each subgrade zone, establishing a one-to-one correspondence using the subgrade zone as an index, forming the subgrade zone control relationship for determining the high liquid limit soil filling treatment method, represented as:

[0073] ;

[0074] in, This refers to the control relationship between roadbed zones. For the first One roadbed zone For the first The bearing capacity requirements corresponding to each roadbed zone This represents the total number of roadbed zones obtained from the division.

[0075] S13 includes:

[0076] S131, obtain the natural moisture content and optimum moisture content of the high liquid limit soil, calculate the difference between the natural moisture content and the optimum moisture content, and take the absolute value of the difference to obtain the moisture content deviation, which characterizes the degree to which the current moisture content of the high liquid limit soil deviates from the optimum compaction moisture content. This deviation is expressed as:

[0077] ;

[0078] in, For the moisture content deviation of high liquid limit soil, The optimal water content for high liquid limit soil;

[0079] S132, based on the correspondence between subgrade zones, bearing requirements, and target compaction degrees, the target compaction degree for each subgrade zone is obtained. Combined with moisture content deviation and field test compaction results of high liquid limit soil under different filling treatment methods, the filling treatment methods for each subgrade zone are matched. Subgrade zones that achieve the corresponding target compaction degree through moisture content control and direct compaction are identified as direct filling areas, and subgrade zones that achieve the corresponding target compaction degree through cement modification are identified as modified filling areas, as follows:

[0080] ;

[0081] in, For the first The filling treatment method for each roadbed zone is either direct filling or cement-modified filling. For high liquid limit soil under different filling treatment methods, the corresponding first... Field test compaction results for each roadbed zone The determination relationship for matching filling treatment methods is based on the target compaction degree, moisture content deviation, and field test compaction results;

[0082] S133 associates each subgrade zone with its corresponding target compaction degree, moisture content deviation, and filling treatment method. For directly filled areas, it sets moisture content control and direct compaction requirements for high liquid limit soil; for improved filled areas, it sets cement improvement and compaction requirements. This forms a subgrade zone filling control scheme to guide the filling construction of each subgrade zone, expressed as:

[0083] ;

[0084] in, A control scheme for the zoning and filling of the roadbed.

[0085] S2 includes:

[0086] S21. Based on the subgrade zoning filling control scheme, subgrade zoning with direct filling as the filling treatment method is extracted, the corresponding subgrade zoning is determined as the direct filling area, and the target filling moisture content requirement corresponding to the direct filling area is obtained as the basis for moisture content control of high liquid limit soil drying treatment.

[0087] S22, the high liquid limit soil for the direct filling area is turned over and dried. During the drying process, the real-time moisture content of the high liquid limit soil is obtained, and the moisture content control deviation between the real-time moisture content and the target filling moisture content corresponding to the direct filling area is calculated. The moisture content control deviation reflecting the difference between the current moisture content of the high liquid limit soil and the filling requirements is obtained, expressed as:

[0088] ;

[0089] ;

[0090] in, For the first The moisture content control deviation corresponding to the directly filled area. This represents the real-time moisture content of high liquid limit soil during the drying process. For the first The target filling moisture content corresponding to each direct filling area. For the first The upper limit of allowable fill moisture content for each direct fill area. For the first The lower limit of permissible moisture content for direct filling areas;

[0091] S23, compare the moisture content control deviation with the allowable moisture content deviation threshold for the corresponding direct filling area. When the moisture content control deviation is not greater than the allowable moisture content deviation threshold, it is determined that the current high liquid limit soil meets the filling conditions for the corresponding direct filling area. When the moisture content control deviation is greater than the allowable moisture content deviation threshold, continue to turn over and dry the high liquid limit soil until the filling conditions are met, thus obtaining high liquid limit soil that meets the filling conditions, represented as:

[0092] ;

[0093] ;

[0094] in, For the first The results of the filling condition determination for each directly filled area. This indicates that the high liquid limit soil meets the filling requirements. This indicates that the high liquid limit soil does not meet the filling conditions. For the first The allowable moisture content deviation threshold for each directly filled area.

[0095] S3 includes:

[0096] S31, high liquid limit soil meeting the filling conditions is used to fill each direct filling area in layers, and each filling layer is compacted according to the compaction requirements of the corresponding direct filling area. After compaction, the in-situ wet density and real-time moisture content of the high liquid limit soil in each filling layer are obtained, and the in-situ dry density of the corresponding filling layer is calculated based on the in-situ wet density and real-time moisture content, expressed as:

[0097] ;

[0098] in, For the first The on-site dry density of the fill layer corresponding to each direct fill area For the first The on-site wet density of the filling layer corresponding to each directly filled area. For the first The real-time moisture content of the filling layer corresponding to each directly filled area during density testing;

[0099] S32, Obtain the maximum dry density of high liquid limit soil determined by compaction test, calculate the ratio of the on-site dry density to the maximum dry density, and obtain the actual compaction degree of the corresponding filling layer in each direct filling area. This is used to characterize the degree to which the high liquid limit soil reaches the maximum compaction state after compaction, and is expressed as:

[0100] ;

[0101] in, For the first The actual compaction degree of the filling layer corresponding to each directly filled area. The maximum dry density of high liquid limit soil used for direct filling;

[0102] S33, compare the actual compaction degree of the corresponding fill layer in each direct fill area with the determined corresponding target compaction degree. When the actual compaction degree is not lower than the target compaction degree, the corresponding fill layer is determined to meet the compaction requirements. When the actual compaction degree is lower than the target compaction degree, the corresponding fill layer continues to be compacted and the actual compaction degree is re-tested until the target compaction requirements are met. The direct fill area that meets the compaction requirements is obtained, represented as:

[0103] ;

[0104] in, For the first The results of determining the compaction requirements of the filling layer corresponding to the direct filling area. This indicates that the corresponding fill layer meets the compaction requirements. This indicates that the corresponding fill layer did not meet the compaction requirements.

[0105] S4 includes:

[0106] S41, based on the subgrade zoning filling control scheme, subgrade zones with cement-modified filling are extracted, and the corresponding subgrade zones are identified as modified filling areas. The target compaction degree corresponding to the modified filling area is obtained. Simultaneously, multiple different cement admixture dosages are set, and compaction tests are conducted on high-liquid-limit soils corresponding to each cement admixture dosage to obtain the field dry density corresponding to each cement admixture dosage, expressed as:

[0107] ;

[0108] in, For the first The degree of compaction of high liquid limit soil corresponding to a certain amount of cement admixture. To adopt the first The dry density of high liquid limit soil on site after modification with cement admixture dosage The maximum dry density corresponding to cement-modified high liquid limit soil;

[0109] S42, compare the compaction degree of high liquid limit soil corresponding to each cement admixture dosage with the target compaction degree of the improved fill area, screen the cement admixture dosages with a compaction degree not lower than the target compaction degree, and determine the cement admixture dosage with the smaller dosage from the cement admixture dosages that meet the target compaction requirements as the target cement admixture dosage, expressed as:

[0110] ;

[0111] in, To determine the target cement admixture dosage, For the first One candidate cement admixture dosage, To improve the filling area sequence number;

[0112] S43, cement is added to the high liquid limit soil used to improve the filling area according to the target cement admixture dosage. The moisture content of the cement-improved high liquid limit soil is controlled, mixed, and leveled. The leveled high liquid limit soil is then compacted to obtain the actual compaction degree. The actual compaction degree is compared with the target compaction degree of the improved filling area. When the actual compaction degree reaches the target compaction degree, the corresponding improved filling area is determined to meet the compaction requirements. The improved filling area that meets the compaction requirements is represented as:

[0113] ;

[0114] in, For the first The results of the compaction requirements assessment for the improved fill area. This indicates that the compaction requirements have been met. This indicates that the compaction requirements have not been met.

[0115] S5 includes:

[0116] S51, Based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, the subgrade is deflected and tested. The subgrade deflection test data corresponding to different test locations are obtained. The subgrade deflection test data are summarized to obtain the representative value of subgrade deflection used to characterize the deformation response of the integral subgrade.

[0117] S52, obtain the design deflection limit value corresponding to the subgrade to be constructed, compare the representative value of the subgrade deflection with the design deflection limit value, determine whether the overall subgrade bearing capacity meets the design requirements based on the comparison results, and combine the compaction results of the direct filling area and the improved filling area to obtain the subgrade zonal filling construction quality evaluation results.

[0118] S51 includes:

[0119] S511, based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, multiple deflection detection locations are set for the subgrade, and the deflection detection values ​​corresponding to each deflection detection location are obtained. The deflection detection values ​​are then summarized according to the detection locations to form a subgrade deflection detection dataset.

[0120] S512, based on the subgrade deflection detection dataset, statistically analyze the deflection values ​​corresponding to each deflection detection location, calculate the arithmetic mean of the subgrade deflection, and determine the minimum and maximum deflection values ​​at a single point in the subgrade deflection detection dataset to obtain the subgrade deflection summary index, expressed as:

[0121] ;

[0122] in, The arithmetic mean of the subgrade deflection. For the first The deflection values ​​corresponding to each deflection detection location. This represents the total number of deflection detection locations.

[0123] ;

[0124] ;

[0125] in, This represents the minimum deflection value at a single point on the subgrade. This represents the maximum deflection value at a single point on the subgrade. For the first The deflection values ​​corresponding to each deflection detection location. , This represents the total number of deflection detection locations.

[0126] S513. Based on the subgrade deflection detection dataset and subgrade deflection summary index, the deflection detection values ​​at each detection location are comprehensively processed according to the evaluation rules adopted for subgrade deflection detection to determine the representative subgrade deflection value used to characterize the overall subgrade deformation response and bearing capacity.

[0127] S52 includes:

[0128] S521, obtain the design deflection limit specified in the design document of the subgrade to be constructed, and establish a correspondence between the design deflection limit and the representative value of subgrade deflection to form a set of parameters for determining the overall subgrade bearing capacity;

[0129] S522 compares the representative value of subgrade deflection with the design deflection limit. When the representative value of subgrade deflection is not greater than the design deflection limit, the overall subgrade bearing capacity is determined to meet the design requirements. When the representative value of subgrade deflection is greater than the design limit, the overall subgrade bearing capacity is determined to not meet the design requirements. The overall subgrade bearing capacity determination result is obtained and expressed as follows:

[0130] ;

[0131] in, The overall roadbed bearing capacity assessment result, This indicates that the overall roadbed bearing capacity meets the design requirements. This indicates that the overall bearing capacity of the roadbed does not meet the design requirements. This represents the subgrade deflection value. The design deflection limit for the roadbed to be constructed;

[0132] S523, obtain the compaction requirement judgment results for each direct filling area and improved filling area, and conduct a comprehensive evaluation in conjunction with the overall subgrade bearing capacity judgment results. When each direct filling area and improved filling area meets the corresponding target compaction requirements and the overall subgrade bearing capacity meets the design requirements, the subgrade zonal filling construction quality is judged to be qualified; otherwise, the subgrade zonal filling construction quality is judged to be unqualified. The subgrade zonal filling construction quality evaluation result is obtained, expressed as:

[0133] ;

[0134] in, The results of the subgrade zoning and filling construction quality evaluation. This indicates that the subgrade zoning and filling construction quality is up to standard. This indicates that the construction quality of the roadbed zoning and filling is substandard. For the first The results of the compaction requirements determination for the directly filled area. For the first The results of the compaction requirements assessment for the improved fill area. This represents the total number of areas to be directly filled. To improve the total number of filling areas.

[0135] Specific examples are as follows:

[0136] Taking the construction of a highway subgrade with high liquid limit soil in a tropical rainy region as an example, the high liquid limit soil in the construction area is characterized by high natural water content, strong water retention, and difficulty in drying during the rainy season. Based on the bearing capacity requirements and compaction control requirements at different subgrade depths, the high liquid limit soil was constructed using zoned filling and localized cement improvement methods, specifically including the following steps:

[0137] S1, Generate the subgrade zoning filling control scheme:

[0138] The design information of the subgrade to be constructed, as well as the natural and optimum moisture content of the high liquid limit soil on site, are obtained. Based on the bearing capacity requirements and compaction control requirements corresponding to the subgrade structural depth, the subgrade is divided into zones 95, 94, and 92 from top to bottom. Zone 95 is the subgrade top 0-80cm area, with a target compaction degree of not less than 95%; Zone 94 is the upper embankment area 80-150cm, with a compaction control standard of not less than 90% in this embodiment; and Zone 92 is the lower embankment area below 150cm, with a compaction control standard of not less than 88% in this embodiment. Combining the moisture content deviation between the natural and optimum moisture content of the high liquid limit soil and the compaction results of field tests, Zones 92 and 94 are determined as direct filling areas, and Zone 95 is determined as a cement-modified filling area, thus generating a subgrade zoning filling control scheme.

[0139] S2, moisture content control for high liquid limit soil in the direct filling area:

[0140] For zones 92 and 94, high-liquid-limit soil generated from on-site excavation was used for direct filling. Before filling, the high-liquid-limit soil was turned over and dried using a rotary tiller for 3 days, during which the real-time moisture content was monitored. When the moisture content of the high-liquid-limit soil reached the target filling moisture content range of 33% to 35%, it was determined that the high-liquid-limit soil met the conditions for direct filling; if the moisture content did not reach the above range, the turning and drying process continued until it met the filling conditions.

[0141] S3, layered filling and compaction of the direct filling area:

[0142] High liquid limit soil meeting the filling conditions was used to fill zones 92 and 94 in layers, with a loose layer thickness controlled at 30cm. For zone 92, a 22t vibratory roller was used for six passes, following the sequence of "one pass of static compaction, one pass of weak vibration, three passes of strong vibration, and one pass of static compaction." Under test conditions with a moisture content of 34.4%, the measured average compaction degree reached 89.7%, exceeding the control standard of 88%. For zone 94, a 22t vibratory roller was used for seven passes, following the sequence of "one pass of static compaction, one pass of weak vibration, four passes of strong vibration, and one pass of static compaction." Under test conditions with a moisture content of 34.5%, the measured average compaction degree reached 91.6%, exceeding the control standard of 90%. Therefore, zones 92 and 94 were determined to meet the corresponding compaction requirements.

[0143] S4, Cement improvement construction is carried out on the improved fill area:

[0144] Field tests were conducted in Zone 95 with different cement admixture dosages, using 3%, 4%, and 5% cement admixtures to improve the high liquid limit soil. Test results showed that with a 3% cement admixture, the average compaction degree was 93.2%, failing to reach the target compaction degree of 95%; with a 4% cement admixture, the average compaction degree reached 96.0%; and with a 5% cement admixture, the average compaction degree reached 96.2%. Since both 4% and 5% cement admixtures met the 95% target compaction degree requirement, the smaller 4% was selected as the target cement admixture dosage, saving approximately 20% in cost compared to using 5%. During construction, 4% cement was added to the high liquid limit soil used for filling in Zone 95, controlling the moisture content at 28%–29%. The mixture was then mixed, leveled, and compacted sequentially to achieve an actual compaction degree of over 95%, forming an improved fill area that met the compaction requirements.

[0145] S5, Evaluate the construction quality of the entire roadbed:

[0146] Based on zones 92, 94, and 95 that meet the compaction requirements, an integral roadbed is formed. After the roadbed construction is completed, deflection testing is conducted on the subgrade to obtain deflection data at different testing locations and determine the representative value of the subgrade deflection. In this embodiment, the representative value of the subgrade deflection is 155.1 (0.01 mm), and the design deflection limit is 251.8 (0.01 mm). Since the representative value of the subgrade deflection is less than the design deflection limit, the overall roadbed bearing capacity is determined to meet the design requirements. At the same time, the actual compaction degree of zones 92, 94, and 95 all meet their respective control requirements. Therefore, the roadbed zoning construction quality of this embodiment is determined to be qualified.

[0147] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0148] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for zonal filling construction of roadbeds with high liquid limit soil in tropical rainy areas, characterized in that, Includes the following steps: S1. Obtain the design information of the subgrade to be constructed, as well as the natural moisture content and optimum moisture content of the high liquid limit soil. Divide the subgrade into subgrade zones according to the bearing requirements and compaction control requirements corresponding to different depths of the subgrade. Determine the target compaction degree of each subgrade zone. Determine the filling treatment method of each subgrade zone according to the moisture content deviation between the natural moisture content and the optimum moisture content. Generate the subgrade zone filling control scheme. S2, Based on the roadbed zoning filling control scheme, determine the direct filling area, turn over and dry the high liquid limit soil, obtain the real-time moisture content and calculate the moisture content control deviation between it and the target filling moisture content, and judge whether the high liquid limit soil meets the filling conditions based on the moisture content control deviation, and obtain the high liquid limit soil that meets the filling conditions. S3, the high liquid limit soil that meets the filling conditions is used to fill and compact the direct filling area in layers. The actual compaction degree is calculated based on the dry density on site and the maximum dry density after compaction. The actual compaction degree is compared with the target compaction degree to obtain the direct filling area that meets the compaction requirements. S4. Based on the roadbed zoning filling control scheme, the improved filling area is determined, the compaction degree of high liquid limit soil corresponding to different cement admixture dosages is obtained, and compared with the target compaction degree, the cement admixture dosage that meets the target compaction degree is determined, and the high liquid limit soil is improved, mixed, leveled and compacted using the determined cement admixture dosage to obtain the improved filling area that meets the compaction requirements. S5. Based on the directly filled area and the improved filled area, an integral subgrade is formed. Subgrade deflection detection data is obtained and the representative value of subgrade deflection is calculated. The representative value of subgrade deflection is compared with the design deflection limit. The bearing capacity of the integral subgrade is determined according to the comparison result, and the subgrade zonal filling construction quality evaluation result is obtained.

2. The method for zonal filling construction of roadbed with high liquid limit soil in tropical rainy areas according to claim 1, characterized in that, S1 includes: S11, Obtain the design information of the roadbed to be constructed. The design information includes the roadbed structure depth, the bearing requirements and compaction control requirements corresponding to each depth range, and obtain high liquid limit soil samples for roadbed filling. Determine the natural moisture content and optimum moisture content of the high liquid limit soil, and correlate the roadbed structure depth, bearing requirements, compaction control requirements, natural moisture content and optimum moisture content to form roadbed zoning basic data. S12, Based on the roadbed zoning basic data, according to the bearing requirements and compaction control requirements corresponding to the roadbed structure depth, the roadbed to be constructed is divided into different roadbed zones, and the compaction control requirements corresponding to each roadbed zone are determined as the target compaction, and the correspondence between roadbed zones, bearing requirements and target compaction is established; S13. Based on the correspondence between the subgrade zoning, bearing requirements and target compaction degree, calculate the moisture content deviation between the natural moisture content and the optimum moisture content of the high liquid limit soil, and determine the corresponding filling treatment method in combination with the target compaction degree of each subgrade zoning. Associate each subgrade zoning, target compaction degree, moisture content deviation and filling treatment method to generate a subgrade zoning filling control scheme.

3. The method for zonal filling construction of roadbed with high liquid limit soil in tropical rainy areas according to claim 2, characterized in that, S12 includes: S121, Based on the roadbed zoning basic data, the bearing requirements and compaction control requirements corresponding to each depth position are extracted in the order of roadbed structure depth. The bearing requirements and compaction control requirements of adjacent depth positions are compared. When the bearing requirements or compaction control requirements corresponding to adjacent depth positions change, the corresponding depth position is determined as the zoning boundary, and the roadbed to be constructed is divided into multiple roadbed zoning according to each zoning boundary. S122, For each subgrade zone obtained by division, extract the bearing requirements and compaction control requirements corresponding to each subgrade zone, and determine the compaction control requirements of the subgrade zone as its target compaction, so that different subgrade zones have target compaction corresponding to their own bearing requirements; S123 associates the location of each subgrade zone, the corresponding bearing requirements, and the target compaction degree, and establishes a one-to-one correspondence with the subgrade zone as an index to form a subgrade zone control relationship for determining the filling treatment method of high liquid limit soil.

4. The method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 3, characterized in that, S13 includes: S131, obtain the natural moisture content and optimum moisture content of the high liquid limit soil, calculate the difference between the natural moisture content and the optimum moisture content, and take the absolute value of the difference to obtain the moisture content deviation, which characterizes the degree to which the current moisture content of the high liquid limit soil deviates from the optimum compaction moisture content. S132, based on the correspondence between the subgrade zoning, bearing requirements and target compaction degree, the target compaction degree of each subgrade zoning is obtained respectively. Combined with the moisture content deviation and the field test compaction results of high liquid limit soil under different filling treatment methods, the filling treatment method of each subgrade zoning is matched. The subgrade zoning that achieves the corresponding target compaction degree through moisture content control and direct compaction is determined as the direct filling area, and the subgrade zoning that achieves the corresponding target compaction degree through cement improvement is determined as the improved filling area. S133 associates each subgrade zone with the corresponding target compaction degree, moisture content deviation, and filling treatment method. It sets high liquid limit soil moisture content control and direct compaction requirements for direct filling areas, and sets cement improvement and compaction requirements for modified filling areas, thus forming a subgrade zone filling control scheme to guide the filling construction of each subgrade zone.

5. The method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 4, characterized in that, S2 includes: S21. Based on the roadbed zoning filling control scheme, extract the roadbed zoning with the filling treatment method of direct filling, determine the corresponding roadbed zoning as the direct filling area, and obtain the target filling moisture content requirement corresponding to the direct filling area as the basis for moisture content control of high liquid limit soil drying treatment. S22, the high liquid limit soil used for the direct filling area is turned over and dried. During the turning and drying process, the real-time moisture content of the high liquid limit soil is obtained, and the moisture content control deviation between the real-time moisture content and the target filling moisture content corresponding to the direct filling area is calculated to obtain the moisture content control deviation reflecting the difference between the current moisture content of the high liquid limit soil and the filling requirements. S23, compare the moisture content control deviation with the allowable moisture content deviation threshold of the corresponding direct filling area. When the moisture content control deviation is not greater than the allowable moisture content deviation threshold, determine that the current high liquid limit soil meets the filling conditions of the corresponding direct filling area. When the moisture content control deviation is greater than the allowable moisture content deviation threshold, continue to turn the high liquid limit soil over and dry it until the filling conditions are met, and obtain high liquid limit soil that meets the filling conditions.

6. The method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 5, characterized in that, S3 includes: S31, the high liquid limit soil that meets the filling conditions is used to fill each direct filling area in layers, and each filling layer is compacted according to the compaction requirements of the corresponding direct filling area. After compaction is completed, the in-situ wet density and real-time moisture content of the high liquid limit soil of each filling layer are obtained, and the in-situ dry density of the corresponding filling layer is calculated based on the in-situ wet density and real-time moisture content. S32, obtain the maximum dry density of high liquid limit soil determined by compaction test, calculate the ratio of the on-site dry density to the maximum dry density, and obtain the actual compaction degree of the filling layer corresponding to each direct filling area, which is used to characterize the degree to which high liquid limit soil reaches the maximum compaction state after rolling. S33, compare the actual compaction degree of the corresponding filling layer in each direct filling area with the determined corresponding target compaction degree. When the actual compaction degree is not lower than the target compaction degree, it is determined that the corresponding filling layer meets the compaction requirements. When the actual compaction degree is lower than the target compaction degree, the corresponding filling layer is continued to be rolled and the actual compaction degree is re-tested until the target compaction requirements are met, thus obtaining a direct filling area that meets the compaction requirements.

7. The method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 6, characterized in that, S4 includes: S41, Based on the roadbed zoning filling control scheme, extract the roadbed zoning with cement-modified filling as the filling treatment method, determine the corresponding roadbed zoning as the modified filling area, and obtain the target compaction degree corresponding to the modified filling area. At the same time, set multiple different cement admixture dosages, and conduct compaction tests on the high liquid limit soil corresponding to each cement admixture dosage to obtain the field dry density corresponding to each cement admixture dosage. S42, compare the compaction degree of high liquid limit soil corresponding to each cement admixture dosage with the target compaction degree of the improved filling area, screen the cement admixture dosage with a compaction degree not lower than the target compaction degree, and determine the cement admixture dosage with the smaller admixture dosage from the cement admixture dosage that meets the target compaction requirement as the target cement admixture dosage. S43, Cement is added to the high liquid limit soil used to improve the filling area according to the target cement admixture dosage. The moisture content of the cement-improved high liquid limit soil is controlled, mixed and leveled. The leveled high liquid limit soil is then rolled to obtain the actual compaction degree. The actual compaction degree is compared with the target compaction degree of the improved filling area. When the actual compaction degree reaches the target compaction degree, it is determined that the corresponding improved filling area meets the compaction requirements, and an improved filling area that meets the compaction requirements is obtained.

8. The method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 7, characterized in that, S5 includes: S51, Based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, the subgrade is deflected and tested. Subgrade deflection test data corresponding to different test locations are obtained. The subgrade deflection test data are summarized to obtain a representative value of subgrade deflection used to characterize the deformation response of the integral subgrade. S52, obtain the design deflection limit value corresponding to the subgrade to be constructed, compare the representative value of the subgrade deflection with the design deflection limit value, determine whether the overall subgrade bearing capacity meets the design requirements based on the comparison result, and obtain the subgrade zonal filling construction quality evaluation result by combining the compaction results of the direct filling area and the improved filling area.

9. A method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 8, characterized in that, S51 includes: S511, Based on the direct filling area and the improved filling area that meet the compaction requirements, an integral subgrade is formed. After the construction of the integral subgrade is completed, multiple deflection detection positions are set for the subgrade, and the deflection detection values ​​corresponding to each deflection detection position are obtained. The deflection detection values ​​are summarized according to the detection positions to form a subgrade deflection detection dataset. S512, Based on the roadbed deflection detection dataset, the deflection detection values ​​corresponding to each deflection detection location are statistically analyzed, the arithmetic mean of the roadbed deflection is calculated, and the minimum and maximum deflection values ​​of a single point in the roadbed deflection detection dataset are determined to obtain the roadbed deflection summary index. S513, Based on the roadbed deflection detection dataset and the roadbed deflection summary index, the deflection detection values ​​at each detection location are comprehensively processed according to the evaluation rules adopted for roadbed deflection detection to determine the representative value of roadbed deflection used to characterize the overall roadbed deformation response and bearing capacity.

10. A method for zonal filling of roadbed with high liquid limit soil in tropical rainy areas according to claim 9, characterized in that, S52 includes: S521, obtain the design deflection limit specified in the design document of the roadbed to be constructed, and establish a correspondence between the design deflection limit and the representative value of the roadbed deflection to form a set of parameters for determining the bearing capacity of the overall roadbed; S522, compare the representative value of the subgrade deflection with the design deflection limit. When the representative value of the subgrade deflection is not greater than the design deflection limit, it is determined that the overall subgrade bearing capacity meets the design requirements. When the representative value of the subgrade deflection is greater than the design limit, it is determined that the overall subgrade bearing capacity does not meet the design requirements, and the overall subgrade bearing capacity determination result is obtained. S523, obtain the compaction requirement judgment results of each direct filling area and improved filling area, and conduct a comprehensive evaluation in combination with the overall subgrade bearing capacity judgment results. When each direct filling area and improved filling area meets the corresponding target compaction requirements and the overall subgrade bearing capacity meets the design requirements, the subgrade zonal filling construction quality is judged to be qualified; otherwise, the subgrade zonal filling construction quality is judged to be unqualified, and the subgrade zonal filling construction quality evaluation result is obtained.

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