CN112376635A - Quality control measure and detection method for soil-stone mixture - Google Patents

Quality control measure and detection method for soil-stone mixture Download PDF

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Publication number
CN112376635A
CN112376635A CN202011435896.8A CN202011435896A CN112376635A CN 112376635 A CN112376635 A CN 112376635A CN 202011435896 A CN202011435896 A CN 202011435896A CN 112376635 A CN112376635 A CN 112376635A
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soil
dry density
rho
rolling
filling
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CN112376635B (en
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王樱畯
姜忠见
雷显阳
赵琳
吴伟伟
孙檀坚
薛阳
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PowerChina Huadong Engineering Corp Ltd
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PowerChina Huadong Engineering Corp Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D33/00—Testing foundations or foundation structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/18—Making embankments, e.g. dikes, dams

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention relates to a quality control measure and a detection method of an earth-rock mixture, which are suitable for quality control and detection of filling bodies such as earth-rock dams, embankment filling and the like with complex material sources in large and medium hydropower engineering. The invention aims to provide quality control measures and a detection method for an earth-rock mixturemaxDividing the difference into a region within a certain range; for each partition, a plurality of groups of indoor heavy or standard compaction maximum dry density tests are carried out, and the minimum average value is taken as the maximum dry density rho of the soil and stone filling of the corresponding partitionmaxkConverting the compactness d according to the design requirement to obtain the on-site dry density control value rhok，ρk＝d×ρmaxk(ii) a Respectively carrying out large difference on the contents of coarse and fine particles in the same material field subareaPerforming field rolling test, drawing a settlement rate curve of each layer, and when various graded soil and stone materials show that the settlement rates tend to be stable and the compaction degrees are basically consistent, the dry density rho after rolling is not less than rhokAnd (4) determining the rolling parameters.

Description

Quality control measure and detection method for soil-stone mixture
Technical Field
The invention relates to a quality control measure and a detection method of an earth-rock mixture. The method is suitable for quality control and detection of filling bodies such as earth and rockfill dams, embankment filling and the like with complex material sources in large and medium hydropower engineering.
Background
In recent years, with the large increase of the investment of the infrastructure in China, the construction of hydropower and hydraulic engineering, such as earth-rock dams, embankment engineering and the like, has been developed unprecedentedly. For large and medium-sized projects, once the quality control measures are improper in the construction process, a series of serious consequences can be caused. Therefore, the scientific and reasonable method for controlling and detecting the filling quality of the earth and stone materials is one of the important means for ensuring safe and stable operation of projects such as earth and stone dams, dykes and the like.
Generally, for filling of earth and stone mixture, if the content of particles smaller than 5mm is larger than 50%, the filling quality is controlled by using the compactness index according to the specifications of the current industry standard rolling earth and stone dam design specification DL/T5395 and the like. When the soil material source is complex, for example, the gravel content in the soil and rock material in the stock ground is changed greatly, the gradation is unstable or various parent rock weathered materials exist, and it is difficult to obtain a maximum dry density value, it is very difficult to obtain a compaction index (the compaction is the on-site measured dry density divided by the maximum dry density) according to the on-site measured dry density of the soil and rock material, because the corresponding maximum dry densities are different in each on-site measured dry density.
According to the fitting method of the maximum dry density of crushed (gravel) stone soil in appendix B.2 of DL/T5129 appendix of rolling type soil-rock dam construction Specification of the existing industry standard, a relation curve of the maximum dry density and gravel content is obtained through indoor standard compaction function tests of different gravel contents of soil stones, and the compaction degree of the soil stones is calculated by comparing the maximum dry density curve with the sampled dry density, water content and gravel content measured on site. The method has many and complicated field detection procedures, and is not completely applicable to various matrix weathered soil stones when the specific gravity difference of each matrix is large.
How to properly control the filling quality of soil and stone materials in the earth-rock dam and embankment engineering with complex material sources through certain measures to meet the filling quality requirements of the soil and stone materials, simplify the on-site detection procedure and ensure the engineering progress is an important technology in the design and construction of hydropower and hydraulic engineering.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problems, a quality control measure and a detection method of the soil-rock mixture are provided.
The technical scheme adopted by the invention is as follows: a quality control measure and a detection method of a soil-rock mixture are characterized in that:
the stock ground is divided into regions, and the maximum dry density value rho ismaxDividing the difference into a region within a certain range;
for each partition, a plurality of groups of indoor heavy or standard compaction maximum dry density tests are carried out, and the minimum average value is taken as the maximum dry density rho of the soil and stone filling of the corresponding partitionmaxk(ii) a Converting the compactness d according to the design requirement to obtain the on-site dry density control value rhok，ρk＝d×ρmaxk；
Respectively carrying out on-site rolling tests on the soil and stone materials with large difference of coarse and fine particle contents in the same material field subarea, drawing a sedimentation rate curve of each layer, and when various graded soil and stone materials show that the sedimentation rates tend to be stable and the compaction degrees are basically consistent, and the dry density rho after rolling is not less than rhokDetermining rolling parameters;
according to the material field partition, filling soil and stone according to the rolling parameters determined by the field rolling test;
during on-site filling, soil and stone materials with large difference of coarse and fine particle contents are respectively tested in the same material field subarea, and an on-site dry density value rho and an on-site dry density control value rho are obtained by samplingkContrast, greater than ρkThe product is qualified; and excavating the unqualified filled soil and stone materials.
In the process of filling the soil and stone materials, rechecking of a field rolling test is carried out at intervals so as to ensure that the construction parameters can reflect the change condition of the source soil and stone materials in time.
The maximum dry density value rhomaxThe difference of 20% is divided into a region.
The invention has the beneficial effects that: the invention adopts dual control indexes of dry density and construction rolling parameters for soil and stone materials with complex material sources, and simultaneously assists the method for controlling the quality of the filled soil and stone materials by material yard partitions, thereby better solving the problem that the maximum dry density can not be accurately valued by the soil and stone material filling field detection.
After the on-site dry density control value of each area of the material source is determined through a certain amount of test work, no matter how complex and changeable the material source is, as long as the material source is in a certain subarea, whether the sampling on the filling construction warehouse surface is qualified or not has definite standards and bases.
According to the invention, through soil material source partition, the maximum range of the maximum dry density change is controlled within 20%, and when the maximum dry density changes within 20%, the content difference of coarse particles and fine particles is also controlled. In order to ensure that the soil and stone materials in the subarea can be well compacted, the rolling parameters can be properly adjusted to be different from those in other subareas so as to strictly meet the design requirements.
In the invention, the average value of the minimum dry density value in each partition is used as the maximum dry density of the soil and stone material filling, and when in field detection, part of the filled soil and stone material can easily meet the requirements, and the actual filling compactness of the soil and stone material filling is possibly lower. Aiming at the problem, dual control indexes of dry density and construction rolling parameters are adopted, so that the defects in the aspect are overcome.
The invention carries out on-site rolling test, utilizes various grades of material sources with large difference of coarse and fine particle content in the same subarea to carry out test, and ensures that the settlement rate of each layer of each material source tends to be stable or the compaction degree is basically the same by adjusting the parameters of the thickness, the rolling weight and the like of the rolling layer. Therefore, when the construction parameters are the same, the actual filling compaction degrees of various soil and stone materials are very close, and the later deformation is controllable.
Detailed Description
The embodiment is a quality control measure and a detection method of an earth-rock mixture, which are suitable for earth-rock materials with the particle content of less than 5mm and more than 50 percent, and the method comprises the following specific steps:
sampling a plurality of groups of soil and stone materials to obtain the maximum indoor dry density rhomaxTesting, dividing the stock ground into a plurality of areas according to the test result, and dividing the maximum dry density value rhomaxDividing the range of the difference within 20% into a zone, partitioning the zone outside the range, and controlling the maximum range of the maximum dry density change of each zone within 20%;
for each partition, a plurality of groups of indoor heavy or standard compaction maximum dry density tests are carried out, and the average value of small values (the average value of data smaller than the average value) is taken as the maximum dry density rho of the soil and stone material filling of the corresponding partitionmaxkConverting the compactness d according to the design requirement to obtain the on-site dry density control value rhok，ρk＝d×ρmaxk；
Respectively carrying out field rolling tests on the soil and stone materials with large content difference of coarse and fine particles in the same material field subarea, drawing a curve of the settlement rate of each layer, and taking construction parameters such as filling layer thickness, rolling times, water sprinkling amount (if the water content in the soil and stone materials is high, water sprinkling can not be carried out), rolling weight and the like when the settlement rate of each layer after rolling tends to be stable and the compaction degrees of various grades of soil and stone materials are close as final rolling parameters; when the settlement rate is difficult to tend to be stable and the compaction degrees of various graded soil and stone materials are difficult to approach, measures such as reducing the thickness of the rolling layer, increasing the rolling weight and the like are adopted for retesting;
according to the material field partition, filling soil and stone according to the rolling parameters determined by the field rolling test;
during on-site filling, soil and stone materials with large difference of coarse and fine particle contents are respectively tested in the same material field subarea, and an on-site dry density value rho and an on-site dry density control value rho are obtained by samplingkContrast, greater than ρkThe product is qualified; excavating and removing unqualified filled soil and stone materials;
in the process of filling the soil and stone materials, the on-site rolling test rechecking is required at intervals so as to ensure that the construction parameters can reflect the change condition of the source soil and stone materials in time.

Claims (3)

1. A quality control measure and a detection method of a soil-rock mixture are characterized in that:
the stock ground is divided into regions, and the maximum dry density value rho ismaxDividing the difference into a region within a certain range;
for each partition, a plurality of groups of indoor heavy or standard compaction maximum dry density tests are carried out, and the minimum average value is taken as the maximum dry density rho of the soil and stone filling of the corresponding partitionmaxkConverting the compactness d according to the design requirement to obtain the on-site dry density control value rhok，ρk＝d×ρmaxk；
Respectively carrying out on-site rolling tests on the soil and stone materials with large difference of coarse and fine particle contents in the same material field subarea, drawing a sedimentation rate curve of each layer, and when various graded soil and stone materials show that the sedimentation rates tend to be stable and the compaction degrees are basically consistent, and the dry density rho after rolling is not less than rhokDetermining rolling parameters;
according to the material field partition, filling soil and stone according to the rolling parameters determined by the field rolling test;
during on-site filling, soil and stone materials with large difference of coarse and fine particle contents are respectively tested in the same material field subarea, and an on-site dry density value rho and an on-site dry density control value rho are obtained by samplingkContrast, greater than ρkThe product is qualified; and excavating the unqualified filled soil and stone materials.
2. The quality control measure and detection method for the soil-rock mixture according to claim 1, characterized in that: in the process of filling the soil and stone materials, rechecking of a field rolling test is carried out at intervals so as to ensure that the construction parameters can reflect the change condition of the source soil and stone materials in time.
3. The quality control measure and detection method for the soil-rock mixture according to claim 1, characterized in that: the maximum dry density value rhomaxThe difference of 20% is divided into a region.
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Cited By (1)

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CN113139298A (en) * 2021-05-12 2021-07-20 中国电建集团成都勘测设计研究院有限公司 Method for evaluating content of ice water accumulated fine-particle impermeable earth material oversized block crushed stone

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