CN112536914B - Gravel doping method for core wall soil material of core wall dam - Google Patents

Gravel doping method for core wall soil material of core wall dam Download PDF

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CN112536914B
CN112536914B CN202011359443.1A CN202011359443A CN112536914B CN 112536914 B CN112536914 B CN 112536914B CN 202011359443 A CN202011359443 A CN 202011359443A CN 112536914 B CN112536914 B CN 112536914B
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soil
gravel
paving
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core wall
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余挺
金伟
朱先文
杨晨光
姜媛媛
王勇
周正军
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PowerChina Chengdu Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C3/00—Apparatus or methods for mixing clay with other substances
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Abstract

The invention relates to a gravel mixing method for a core wall soil material of a core wall of a dam, and belongs to the technical field of gravel soil material preparation methods in hydropower engineering. The invention is based on the initial P of the natural stock ground soil5The invention relates to a content detection result, which is based on soil material P5The content space difference distribution carries out dynamic calculation analysis on the blending proportion of the soil material and the stone material to determine the blending proportion, and the mature and simple construction process is utilized to blend the mixture with different soil-stone proportions, so that the blended gravelly soil P5The content is accurately controlled within a certain range, and the guarantee rate of reaching the design expected value is over 90 percent. After this process, P can be5The content range is narrowed by 3 to 4 times, the quality and controllability of the core wall gravel soil are greatly improved, and the development of the high gravel soil core wall rock-fill dam construction technology is promoted. Meanwhile, the selection range of the soil yard is expanded, so that the engineering investment can be effectively saved, and the land resource can be saved.

Description

Gravel doping method for core wall soil material of core wall dam
Technical Field
The invention relates to a gravel mixing method for a core wall soil material of a core wall of a dam, and belongs to the technical field of gravel soil material preparation methods in hydropower engineering.
Background
The earth core dam is a dam type widely applied to hydraulic and hydroelectric engineering construction and plays an important role in dam construction at home and abroad. Because of the large difference of the deformation modulus of the filling materials in the subareas, certain deformation incompatibility usually exists between the dam-shaped core wall and the dam shell subarea, and the deformation incompatibility is particularly remarkable in a high-soil core wall dam. In order to reduce the deformation incompatibility caused by the difference of the deformation modulus between the core wall area and the dam shell area as much as possible, a certain proportion of gravels are often mixed in the core wall soil material in engineering to form core wall gravels soil.
The prior engineering practice and related research show that P in gravel soil5The content is one of the key factors for determining the performance index of the soil material, and the deformation modulus and the shear strength of the gravel soil and the P5The content is in positive correlation, and the permeability coefficient is in positive correlation with P5The content is in a negative correlation, where P is5The content refers to the content of coarse particles (gravel) with the particle size of more than 5mm in the soil body. To ensure good performance of core gravel earth materials, i.e. higher strength deformation index and smaller permeability coefficient, P is required to be added5The content is accurately controlled within a certain range. In practical engineering, the core wall soil is taken from a natural soil yard, and the soil P5The content is in space variability and has large discreteness, and the physical and mechanical performance indexes of the gravel soil formed by directly adopting natural soil materials or directly mixing gravel according to a fixed proportion are difficult to stably meet the design requirements.
At present, the method for blending and modifying the core wall material of the earth core wall at home and abroad is mainly divided into two methods. One is a large-scale intelligent belt conveyor, and the other is flat laying vertical mining mechanical blending. Both of these blending processes are that after the earth material is mined in the stock ground, it is blended with gravel (crushed) stone in a certain fixed proportion, and the gravel soil formed by this blending method has poor property stability and large index volatility.
In the prior art, the P is limited by the soil material of a natural soil yard5The content is in the characteristic of space variability, and the soil material P5The dispersion of the content is large, and after the content is blended in a fixed ratio, the properties of the core gravel soil material are unstable, the dispersion is large, and the core gravel soil material greatly deviates from the range of the expected design value, as shown in fig. 1.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for mixing gravels in the soil material of the core wall of the earth core wall dam is provided, so that the character index of the prepared gravels soil is stable, and the fluctuation of the index is reduced.
In order to solve the technical problems, the invention adopts the technical scheme that: the gravel mixing method for the core wall soil material of the core wall dam comprises the following steps:
selecting a mining area, adopting a backhoe excavator to perform vertical mining on the soil according to a set elevation in the area, and performing blending on a bin surface during mining; transferring the mixed soil material to a mixing field;
step two, carrying out subarea paving in a mixing field by adopting a grid subarea mode, wherein the paving thickness of each grid is fixed as HSoil for soilAnd P for the soil material in each grid5Detecting the content;
thirdly, calculating the paving thickness H of the gravel material by adopting the following formulaGravel:
Figure BDA0002803570250000021
In the formula: hGravelThe thickness of the paving material of the gravel material is in cm;
e (x) P for designing core gravel soil5Desired value of content in%;
a is the gravel material P to be doped5Content, in%;
ρgravel-gravel dry density, g/cm3；
P5 measurement of-material source detection P of earth material5Value in%;
ρsoil for soilIs the dry density of the soil material and has the unit of g/cm3；
HSoil for soilThe thickness of the soil paving material is in cm;
the paving thickness H of the gravel material corresponding to the soil material in each gridGravelRespectively calculating;
step four, the paving thickness H of the gravel material obtained in the step three is usedGravelPaving gravel material with the thickness of H on the soil paved in the step threeGravel；
Step five, paving soil materials on the gravel materials paved in the step four, and repeating the step two to the step four to finish the paving of all the soil materials and the gravel materials;
and step six, after the paving is finished, blending for many times to obtain the gravel soil material of the dam core wall of the earth core wall.
Further, the method comprises the following steps: before the mining area is selected, a material source three-dimensional geological information system is established for a heart wall earth stock ground, and a cloud picture is adopted to represent different areas P of the stock ground5Range of variation of the content, for P5The content is processed by P of the stock ground in a plurality of continuously arranged setting parameter range intervals5Content is divided into regions, and the difference value between the upper limit value and the lower limit value of a single set parameter range interval is 10-15 percent; and determining the dynamic zoning exploitation range of the soil material according to the production condition of the gravel material.
Further, the method comprises the following steps: in the first step, after the mining area is selected, a backhoe excavator is adopted to conduct vertical face mining on the soil material by 4m of height, and after the bin face is mixed twice, the mixed soil material is transported to a mixing field.
Further, the method comprises the following steps: in the second step, when the mixing field adopts a grid partition mode to perform partition paving, each grid is set to be 10m multiplied by 10 m.
Further, the method comprises the following steps: and sixthly, after the three layers of soil materials and the three layers of gravel materials are alternately paved, blending by using a face shovel for 3 times to obtain the gravel soil material of the core wall of the earth core dam.
The invention has the beneficial effects that: based on natural stock ground soil material is initial P5The invention relates to a content detection result, which is based on soil material P5The content space difference distribution carries out dynamic calculation analysis on the blending proportion of the soil material and the stone material to determine the blending proportion, and the mature and simple construction process is utilized to blend the mixture with different soil-stone proportions, so that the blended gravelly soil P5The content is accurately controlled within a certain range, and the guarantee rate of reaching the design expected value is over 90 percent.
The invention can determine the gravel soil P of the heart wall according to the fine exploration result of the stock ground and the determination of the dynamic blending proportion5And (4) precisely controlling the content. The selection range of the gravel soil core wall rock-fill dam soil yard is expanded, and after the method is adopted for the property-dispersed soil yard, P can be used5The content range is narrowed by 3 to 4 times, the quality and controllability of the core wall gravel soil are greatly improved, and the development of the high gravel soil core wall rock-fill dam construction technology is promoted. At the same time, the selection range of the earth stock ground is expandedAnd the engineering investment can be effectively saved, and the land resource is saved.
Drawings
FIG. 1 is a prior art P for the immobilization of doped gravelly soil5And (5) content distribution diagram.
FIG. 2 is a process flow diagram of the present invention.
FIG. 3 is a schematic view of a blender floor decking grid in accordance with the present invention.
FIG. 4 shows the method P of the present invention and the method P of the present invention with 7:3 fixed mixing ratio5Fluctuation range versus graph.
FIG. 5 shows an example of the present invention and a method P of 8:2 fixed blending ratio5Fluctuation range versus graph.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
As shown in fig. 2, the present invention, when implemented, comprises the following steps:
selecting a mining area, adopting a backhoe excavator to perform vertical face mining on the soil according to a set elevation in the area, and performing blending on a bin face during mining, wherein the blending is generally performed once or twice; transferring the mixed soil material to a mixing field;
step two, carrying out subarea paving in a mixing field by adopting a grid subarea mode, wherein the paving thickness of each grid is fixed as HSoil for soilAnd P for the soil material in each grid5Detecting the content;
thirdly, calculating the paving thickness H of the gravel material by adopting the following formulaGravel:
Figure BDA0002803570250000031
In the formula: hGravelThe thickness of the paving material of the gravel material is in cm;
e (x) P for designing core gravel soil5Desired value of content in%;
a is the gravel material P to be doped5Content, in%;
ρgravel-gravel dry density, g/cm3；
P5 measurement of-material source detection P of earth material5Value in%;
ρsoil for soilIs the dry density of the soil material and has the unit of g/cm3；
HSoil for soilThe thickness of the soil paving material is in cm;
the paving thickness H of the gravel material corresponding to the soil material in each gridGravelRespectively calculating;
step four, the paving thickness H of the gravel material obtained in the step three is usedGravelPaving gravel material with the thickness of H on the soil paved in the step threeGravel；
Step five, paving soil materials on the gravel materials paved in the step four, and repeating the step two to the step four to finish the paving of all the soil materials and the gravel materials;
and step six, after the paving is finished, blending for many times to obtain the gravel soil material of the dam core wall of the earth core wall.
Wherein the paving thickness H of the gravel materialGravelIs derived according to the following formula:
Figure BDA0002803570250000041
p may still exist due to the soil at different elevations5The content difference is large, therefore, in the step one, the invention adopts the method of vertical mining mixing and in-situ mixing of small bin surfaces of the bins, which can improve the uniformity of the soil, thereby detecting P in the step two5When the content is contained, the accuracy of a detection result can be improved; finally increasing the paving thickness H of the gravel material in the third stepGravel"accuracy of the calculation result. The invention is based on the soil material P5The content space difference distribution carries out dynamic calculation analysis on the blending proportion of the soil material and the stone material, the blending proportion of the gravel material of each layer is determined according to the calculation result, the mature and simple construction process is utilized to blend the mixture with different soil-stone proportions, and therefore the blended gravel soil P is enabled to be5The content is accurately controlled in a certain range through engineeringPractice shows that the guarantee rate of reaching the design expected value is over 90 percent.
In addition, in the first step, before the mining area is selected, the method establishes a material source three-dimensional geological information system for the heart wall earth stock ground, and adopts a cloud picture to represent different areas P of the stock ground5Range of variation of the content, for P5The content is processed by P of the stock ground in a plurality of continuously arranged setting parameter range intervals5Content division, the difference between the upper limit value and the lower limit value of a single set parameter range interval being 10-15%, for example, according to P5The contents of 0-15%, 15-30% and 30-45% are analogized in sequence, and P of the stock ground is carried out5Content partitioning; and determining the dynamic zoning exploitation range of the soil material according to the production condition of the gravel material. The cloud picture is adopted to represent different areas P of the stock ground5After the content is in the variation range, the soil distribution condition of the stock ground can be visually obtained; and according to P5The content is divided into regions, the needed gravel material is accurately estimated, and excessive or insufficient gravel material obtained by production is avoided. Meanwhile, a proper subarea can be selected as a mining area according to the production condition of gravel materials. For example, P may be selected when gravel production capacity is insufficient5The zones with higher contents are used as mining areas.
Considering both the construction efficiency and the uniformity of the blended soil, in the step one, after a mining area is selected, the invention adopts a backhoe to mine the vertical surface of the soil by dividing the height of 4m by the backhoe, and the blended soil is transported to a blending field after being blended twice on the surface of a bin.
Considering both the construction efficiency and the paving thickness H of gravelGravelAnd in the second step, when the blending field adopts a grid partition mode to perform partition paving, each grid is set to be 10m multiplied by 10 m. A schematic of the applicator field decking grid can be seen in fig. 3.
In order to improve the uniformity of the gravel soil of the core wall of the prepared earth core dam, the preferable embodiment is as follows: and in the sixth step, after the three layers of soil materials and the three layers of gravel materials are alternately paved, blending by using a face shovel for 3 times to obtain the gravel soil materials of the core wall of the earth core dam.
Examples
The method is implemented according to the following steps:
step one, establishing a material source three-dimensional geological information system for a heart wall soil stock ground, and representing different regions P of the stock ground by using a cloud chart5Range of variation of the content, for P5The content is processed by P of the stock ground in a plurality of continuously arranged setting parameter range intervals5Content is divided into regions, and the difference value between the upper limit value and the lower limit value of a single set parameter range interval is 10-15 percent; determining the dynamic zoning mining range of the soil material according to the production condition of gravel materials; after a mining area is selected, adopting a backhoe excavator to carry out soil elevation mining on 4m of elevation in the area, mixing and stirring twice on the surface of a bin during mining, and then transferring to a mixing field;
step two, carrying out subarea paving in a 10m multiplied by 10m grid subarea mode in the mixing field, wherein the paving thickness of each grid is fixed as HSoil for soilAnd P for the soil material in each grid5Detecting the content;
thirdly, calculating the paving thickness H of the gravel material by adopting the following formulaGravel:
Figure BDA0002803570250000051
In the formula: hGravelThe thickness of the paving material of the gravel material is in cm;
e (x) P for designing core gravel soil5Desired value of content in%;
a is the gravel material P to be doped5Content, in%;
ρgravel-gravel dry density, g/cm3；
P5 measurement of-material source detection P of earth material5Value in%;
ρsoil for soilIs the dry density of the soil material and has the unit of g/cm3；
HSoil for soilThe thickness of the soil paving material is in cm;
the paving thickness H of the gravel material corresponding to the soil material in each gridGravelRespectively calculating;
in this example, E (x) is 42%, HSoil for soilTaking the measured values as examples for the rest parameters of 80cm, and comparing with the traditional method;
step four, the paving thickness H of the gravel material obtained in the step three is usedGravelPaving gravel material with the thickness of H on the soil paved in the step threeGravel；
Step five, paving soil materials on the gravel materials paved in the step four, and repeating the step two to the step four to finish the paving of all the soil materials and the gravel materials;
and step six, after the three layers of soil materials and the three layers of gravel materials are alternately paved, blending by using a face shovel for 3 times to obtain the gravel soil materials of the core wall of the earth core dam.
After the blending is finished, dividing the finished material into n areas, sampling and detecting 5 groups of P in each area5And (4) content.
The detection result of the obtained finished product material shows that the core wall gravelly soil P is detected by engineering example inspection5The content is accurately controlled, P5The content does not fluctuate by more than 5% around the design desired value.
Under the same process conditions, a traditional fixed mixing ratio method is adopted, and the soil material: the gravel material is respectively implemented according to the fixed mixing ratio of 7:3 and the fixed mixing ratio of 8: 2.
The traditional fixed mixing ratio method and the precise control method P adopted by the embodiment of the invention5The fluctuation range is shown in fig. 4 and 5.
Compared with the traditional fixed mixing ratio method, the method has the advantages that the control guarantee rate is obviously improved, the core gravel soil material with stable and reliable quality can be provided for the high core rock-fill dam, and the development of the high core rock-fill dam construction technology is promoted. The method can expand the use range of the soil yard, utilize the soil in the existing soil yard as much as possible, effectively save the engineering investment and save the land resources.

Claims (4)

1. The gravel mixing method for the core wall soil material of the core wall dam is characterized by comprising the following steps:
selecting a mining area, adopting a backhoe excavator to perform vertical mining on the soil according to a set elevation in the area, and performing blending on a bin surface during mining; transferring the mixed soil material to a mixing field;
step two, carrying out subarea paving in a mixing field by adopting a grid subarea mode, wherein the paving thickness of each grid is fixed as HSoil for soilAnd P for the soil material in each grid5Detecting the content;
thirdly, calculating the paving thickness H of the gravel material by adopting the following formulaGravel:
Figure FDA0003462487690000011
In the formula: hGravelThe thickness of the paving material of the gravel material is in cm;
e (x) P for designing core gravel soil5Desired value of content in%;
a is the gravel material P to be doped5Content, in%;
ρgravel-gravel dry density, g/cm3；
P5 measurement of-material source detection P of earth material5Value in%;
ρsoil for soilIs the dry density of the soil material and has the unit of g/cm3；
HSoil for soilThe thickness of the soil paving material is in cm;
the paving thickness H of the gravel material corresponding to the soil material in each gridGravelRespectively calculating;
step four, the paving thickness H of the gravel material obtained in the step three is usedGravelPaving gravel material with the thickness of H on the soil paved in the step threeGravel；
Step five, paving soil materials on the gravel materials paved in the step four, and repeating the step two to the step four to finish the paving of all the soil materials and the gravel materials;
step six, after the paving is finished, blending for many times to obtain the gravel soil material of the core wall;
step one, before the mining area is selected, the wall earth material is subjected to centeringEstablishing a stock source three-dimensional geological information system in a field, and representing different regions P of the stock field by using a cloud picture5Range of variation of the content, for P5The content is processed by P of the stock ground in a plurality of continuously arranged setting parameter range intervals5Content is divided into regions, and the difference value between the upper limit value and the lower limit value of a single set parameter range interval is 10-15 percent; and determining the dynamic zoning exploitation range of the soil material according to the production condition of the gravel material.
2. The method of claim 1, wherein the step of mixing gravel into the earth material comprises: in the first step, after the mining area is selected, a backhoe is adopted, the backhoe is adopted to mine the vertical surface of the soil material at 4m height, and after the bin surface is mixed twice, the soil material is transported to a mixing field.
3. The method of claim 1, wherein the step of mixing gravel into the earth material comprises: in the second step, when the mixing field adopts a grid partition mode to perform partition paving, each grid is set to be 10m multiplied by 10 m.
4. A method of doping gravel into core material of a core-earth dam as claimed in any one of claims 1 to 3, wherein: and sixthly, after the three layers of soil materials and the three layers of gravel materials are alternately paved, blending by using a face shovel for 3 times to obtain the gravel soil material of the core wall of the earth core dam.
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CN113139298B (en) * 2021-05-12 2022-05-20 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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CN206639018U (en) * 2017-02-24 2017-11-14 天津大学 Gravel earth material is mixed with procedural information automatic acquisition device
CN106996095A (en) * 2017-04-11 2017-08-01 广东水电二局股份有限公司 A kind of preparation method of rubble clay core wall material
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