CN114482053A - High earth-rock dam seepage-proofing soil material blending construction method - Google Patents
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Abstract
The invention discloses a high earth-rock dam seepage-proofing soil material blending construction method, which comprises the steps of determining the position of a stock ground, sampling, detecting soil layer parameters, determining a clay layer and a gravel soil layer, re-layering the gravel soil layer of the stock ground, determining average parameters of each gravel soil layer after re-layering of the stock ground, calculating a blending ratio and water addition amount, blending in the blending field layers according to the calculation result, adding water to adjust the content and water content of P5, detecting prepared soil materials, and filling the high earth-rock dam if the soil materials are qualified; if the detection is unqualified, blending again; according to the invention, through investigation and soil property analysis of the soil layer at the position of the dam construction yard, aiming at the unevenness of soil distribution and water content deviation, the soil material blending yard is arranged in the dam construction area, and blending of the anti-seepage soil material is completed by utilizing different layered soil materials on site, so that the quality meets the design requirement, the requirement of high-strength filling construction of the dam can be met on the production capacity, the transportation cost is reduced, and the construction efficiency is improved.
Description
Technical Field
The invention relates to the field of earth and rockfill dam construction, in particular to a construction method for blending seepage-proof earth materials of a high earth and rockfill dam.
Background
Because the crushed stone soil has high shear strength, good impermeability and good compaction performance, the crushed stone soil gradually becomes the preferred impermeable material in the high core wall rock-fill dam. According to statistics, in a high earth-rock dam with over 100m abroad, the earth-rock dam adopting broken stone and soil as an impermeable material accounts for 70 percent of the total number.
Due to different topographic and geological conditions of damming areas, the soil of the gravel soil yard may have unevenness on the plane position and elevation distribution, so that the design requirements cannot be met even if a front shovel and a back shovel are used for vertical mining and mixing operation, meanwhile, the deviation between the water content of the soil of the yard and the optimal water content of filling is large, and in order to enable the production of the gravel soil, the design requirements can be met in quality, the requirements of high-strength filling construction of the dam can also be met in productivity, and the gravel soil needs to be blended to meet the requirements.
Disclosure of Invention
The invention aims to solve the technical problem that the stockyard soil cannot meet the design requirement due to different terrain and geological conditions of a damming area, and aims to provide a high earth-rock dam seepage-proofing soil blending construction method which solves the problem of blending and adjusting the soil on a damming site.
The invention is realized by the following technical scheme:
a construction method for blending anti-seepage soil materials of a high earth-rock dam comprises the following steps:
determining the position of a stock ground, and sampling a soil layer of the stock ground in the vertical direction;
detecting soil layer parameters including water content, P5 content, clay content and bulk density according to the sampling data;
determining a clay layer and a gravel soil layer;
setting a value range of soil layer parameters, and re-layering the crushed stone soil layers of the stock ground according to the value range;
determining average parameters of each broken stone soil layer after the re-layering of the stock ground;
calculating a blending ratio and a water adding amount by combining the parameters of the gravel layer and the optimal water content of the impermeable soil material required by the high earth-rock dam filling area;
blending in the blending field layers according to the calculation result and adding water to adjust the content and the water content of P5;
detecting the prepared soil material, and if the soil material is qualified, filling a high earth-rock dam; and re-blending if the detection is unqualified.
Specifically, the gravel layer in the parameters of the gravel layer of the stock ground is determined to include three states:
the first state: the natural grading of the gravel soil meets the requirement;
and a second state: the natural grading of the crushed soil does not meet the requirement;
when the gravel soil layer is in a first state, adding water into the gravel soil for adjustment;
and when the gravel soil layer is in the second state, carrying out clay blending and water adding adjustment on the gravel soil.
As one embodiment, when the crushed stone layer is in a state one, the construction method includes:
paving the gravel soil meeting the requirements to a set thickness;
transversely arranging a plurality of water adding tunnels, wherein the distances between two adjacent water adding tunnels are equal, and the length, the width and the depth of each water adding tunnel are set;
determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
setting the days of water sealing and carrying out water sealing treatment.
Specifically, the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of the gravel soil layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining the spreading amount of the gravel soil, and calculating the water adding amount: l ═ Q (w)0-w + w'), wherein L is the amount of water added, Q is the paving amount of the gravel soil, w is the average natural moisture content of the gravel soil layer, w0For optimal moisture content, w' is the water loss error.
Preferably, the set thickness is 3m, the length, the width and the depth of the water adding tunnel are respectively 3m, 1m and 1m, and the distance between two adjacent water adding tunnels is 1 m.
As a second embodiment, when the crushed stone layer is in state two, the construction method includes:
measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
determining the paving thickness of the gravel soil layer, and setting the paving thickness as a first thickness;
determining the paving thickness of the clay layer, and setting the paving thickness as a second thickness:
wherein h is1Is a first thickness, h2Is the second thickness, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
paving a gravel soil layer by adopting an occupation method;
paving a clay layer by adopting a retreating method;
transversely arranging a plurality of water adding tunnels, wherein the distances between two adjacent water adding tunnels are equal, and the length, the width and the depth of each water adding tunnel are set;
determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
setting the days of water sealing and carrying out water sealing treatment.
Specifically, the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining the spreading amount of the gravel soil and the spreading amount of the clay layer, and calculating the water adding amount: l ═ Q1+Q2)w0-Q1(w1-w')-Q2(w2-w'), wherein L is the amount of water added, Q1The spreading amount of the gravelly soil in the second state, Q2Spreading amount of clay in State two, w1In layers of crushed stoneAverage natural water content, w2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
Preferably, the first thickness is 1m, the length, width and depth of the watering tunnel are 3m, 1m and 1m respectively, and the distance between two adjacent watering tunnels is 1 m.
As a third embodiment, when the crushed rock soil layer is in the state two, and the preparation strength of the crushed rock soil is not satisfactory, the construction method includes:
measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
determining the blending volume of the gravel layer, and setting the blending volume as a first volume;
determining the blending volume of the clay layer, and setting as a second volume:
wherein, V1Is a first volume, V2Is the second volume, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
determining the water adding amount according to the optimal water content, and mixing and stirring the water adding amount, the first volume of the gravel soil and the second volume of the clay;
and (4) stacking the mixture, setting the days of water sealing, and performing water sealing treatment.
Specifically, the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining a first volume and a second volume, and calculating the water addition: l ═ Q3+Q4)w0-Q3(w1-w')-Q4(w2-w'), wherein L is the amount of water added, Q3Is a first volume, Q4Is the second volume, w1Is the average natural water content, w, of the gravel soil layer2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, through investigation and soil property analysis of the soil layer at the position of the dam construction yard, aiming at the unevenness of soil distribution and water content deviation, the soil material blending yard is arranged in the dam construction area, and blending of the anti-seepage soil material is completed by utilizing different layered soil materials on site, so that the blending process is simple, convenient and feasible, the site construction operation is convenient, the design requirement can be met on the quality, the requirement of high-strength filling construction of the dam can be met on the productivity, the transportation cost is reduced, and the construction efficiency is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
Fig. 1 is a schematic flow chart of a first embodiment of an impervious soil blending construction method for a high earth-rock dam according to the invention.
Fig. 2 is a schematic flow chart of a second embodiment of the impervious soil blending construction method for the high earth-rock dam according to the invention.
Fig. 3 is a schematic flow chart of a third embodiment of the impervious soil blending construction method for the high earth-rock dam according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations of the invention.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The blending construction method is suitable for mining and blending construction of the anti-seepage soil material of the contemporary rolling type high earth-rock dam, solves the problem of small natural water content, and generally, the gravel soil in the gravel soil layer of the stock ground comprises two states, namely the natural grading of the gravel soil meets the requirement and the natural grading of the gravel soil does not meet the requirement.
The preparation speed of the impermeable soil also has two states, namely that the preparation strength of the gravelly soil meets the requirement and the preparation strength of the gravelly soil does not meet the requirement.
Example one
The embodiment is a high earth-rock dam seepage-proofing soil material blending construction method aiming at the situation that the natural grading of the gravel soil of a stock ground meets the requirement and the preparation strength of the gravel soil meets the requirement, and the method comprises the following steps:
the method comprises the following steps of firstly, determining the position of a stock ground, and sampling the soil layer of the stock ground in the vertical direction, so that repeated sampling can be performed at a plurality of positions for the convenience of determining the soil layer clearly, and the sampling is accurate.
The second step, according to the sampling data, detect soil layer parameter, including water content, P5 content, glutinous grain content, bulk density, this step can be in the laboratory through traditional mode survey relevant data.
And thirdly, determining a clay layer and a crushed stone layer, and dividing the clay layer and the crushed stone layer according to the measured P5 content and the clay content, wherein the specific dividing method can be known by a person skilled in the art.
Fourthly, setting a value range of soil layer parameters, and re-layering the crushed stone soil layers of the stock yard according to the value range; the P5 content and the clay content are used for further division, so that the phenomenon that the blending calculation is influenced when the upper part and the lower part of the gravel layer are too large to cause the subsequent steps is avoided, and the parameters of the impermeable soil material are influenced.
And fifthly, determining average parameters of each broken stone soil layer after the subdivision of the stock yard, namely determining the parameters of the mined broken stone soil when the broken stone soil layer is mined, so as to be convenient for calculating the water adding amount and the blending ratio in the subsequent steps.
In this embodiment, the natural composition of the crushed soil is set to meet the requirement, and the natural composition of the crushed soil in this state is good, so that when the P5 content and the composition requirement of the design requirement are met, the water content only needs to be adjusted in the stock dump, and the problem of low natural water content is solved.
And sixthly, calculating the water adding amount by combining the parameters of the gravel soil layer and the optimal water content of the impermeable soil material required by the high earth and rockfill dam filling area, wherein the water adding amount is not required to be blended in the embodiment, so that only the water adding amount is required to be calculated, and the method for determining the water adding amount comprises the following steps of:
(1) and (3) acquiring the average natural water content of the gravel soil layer after laboratory measurement, and obtaining related data after the laboratory tests the sampled soil layer.
(2) And determining the optimal water content of the impermeable soil material, and performing related determination according to the weather condition, the water content condition, the geological condition and the like of the damming area of the high earth-rock dam, wherein the determination can be understood and implemented by a person skilled in the art.
(3) Determining the spreading amount of the gravel soil, and calculating the water adding amount: l ═ Q (w)0-w + w'), wherein L is the amount of water added, Q is the paving amount of the gravel soil, w is the average natural moisture content of the gravel soil layer, w0For optimal moisture content, w' is the water loss error.
If the average natural water content of the gravel soil impermeable material is about 6 percent and the average value of the optimal water content is about 12 percent, the water adding amount is 8 percent (considering the error of 2 percent of water loss).
And seventhly, adding water in the blending field according to the calculation result to adjust the water content, wherein the specific method comprises the following steps:
(1) the gravel soil meeting the requirements is paved to a set thickness, and the paving thickness is 3m in the embodiment.
(2) The water adding device is characterized in that a plurality of water adding tunnels are transversely arranged, the distance between two adjacent water adding tunnels is equal (the distance between the two adjacent water adding tunnels is 1m), and the length, the width and the depth of the water adding tunnels are set (the length, the width and the depth of the water adding tunnels are respectively 3m, 1m and 1 m).
(3) Determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
(4) the days of water-stopping were set and water-stopping treatment was carried out, and in this example, the days of water-stopping treatment were 7 days.
Eighthly, detecting the prepared soil material, and filling the high earth-rock dam if the soil material is qualified; and if the soil is not qualified, re-blending, namely, after the blended soil parameters are obtained, re-performing the sixth step.
Example two
According to the mining condition in the earth material yard, combining the sampling experiment result of the earth material, when the natural gradation of the gravelly soil can not meet the requirement, according to the natural gradation and the water content of the clay layer and the gravelly soil layer obtained by sampling corresponding production areas in the earth material yard, the embodiment is a high earth-rock dam seepage-proofing earth material blending construction method aiming at the situation that the natural gradation of the gravelly soil of the earth material yard does not meet the requirement but the preparation strength of the gravelly soil meets the requirement, and the method comprises the following steps:
the method comprises the steps of firstly, determining the position of a stock ground, and sampling the soil layer of the stock ground in the vertical direction;
secondly, detecting soil layer parameters including water content, P5 content, clay content and bulk density according to the sampling data;
thirdly, determining a clay layer and a gravel soil layer;
fourthly, setting a value range of soil layer parameters, and re-layering the crushed stone soil layers of the stock yard according to the value range;
fifthly, determining average parameters of each broken stone soil layer after the material yard is layered again; in this embodiment, the natural composition of the gravel soil is set to be not satisfactory, the natural composition of the gravel soil in this state is not good, and if the P5 content and the composition requirement of the design requirement need to be met, blending with different layer thicknesses needs to be performed in a stock yard according to parameters (P5 content and clay content) of the gravel soil layer, so that the problems that the natural composition does not conform to the requirements and the natural water content is smaller are solved.
And sixthly, calculating a blending ratio and a water adding amount by combining the parameters of the gravel layer and the optimal water content of the impermeable soil material required by the high earth-rock dam filling area.
The method for determining the water adding amount comprises the following steps:
(1) obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
(2) determining the optimal water content of the impermeable soil material;
(3) determining the spreading amount of the gravel soil and the spreading amount of the clay layer, and calculating the water adding amount: l ═ Q1+Q2)w0-Q1(w1-w')-Q2(w2-w'), wherein L is the amount of water added, Q1Spreading amount of crushed soil in State two, Q2Spreading amount of clay in State two, w1Is the average natural water content, w, of the gravel soil layer2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
The method for calculating the blending ratio comprises the following steps:
(1) measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
(2) determining the paving thickness of the gravel soil layer, and setting the paving thickness as a first thickness (the first thickness is 1 m);
(3) determining the paving thickness of the clay layer, and setting the paving thickness as a second thickness:
wherein h is1Is a first thickness, h2Is the second thickness, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
seventhly, blending in the blending field layers according to the calculation result and adding water to adjust the content and the water content of P5, wherein the construction method comprises the following steps:
(1) paving a gravel soil layer by adopting an occupation method; paving a clay layer by adopting a retreating method; the first layer of paving material is not limited, but the top layer is preferably a gravel layer. The spreading material should adopt a bulldozer or a loader, the spreading thickness should be strictly controlled, and the error is not more than 10%.
(2) The water adding device is characterized in that a plurality of water adding tunnels are transversely arranged, the distance between two adjacent water adding tunnels is equal (the distance between the two adjacent water adding tunnels is 1m), and the length, the width and the depth of the water adding tunnels are set (the length, the width and the depth of the water adding tunnels are respectively 3m, 1m and 1 m).
(3) Determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
(4) the number of days of water-stopping (7 days in this example) was set, and water-stopping was performed.
Eighthly, detecting the prepared soil materials, and if the soil materials are qualified, filling the high earth-rock dam; and if the soil material is not qualified, acquiring the blended soil material parameters, and then re-performing the sixth step.
EXAMPLE III
The embodiment is a high earth-rock dam seepage-proofing soil material blending construction method aiming at the problems that the natural grading of the rubble soil in a stock ground does not meet the requirement and the preparation strength of the rubble soil does not meet the requirement, and the method comprises the following steps:
the method comprises the steps of firstly, determining the position of a stock ground, and sampling the soil layer of the stock ground in the vertical direction;
secondly, detecting soil layer parameters including water content, P5 content, clay content and bulk density according to the sampling data;
thirdly, determining a clay layer and a gravel soil layer;
fourthly, setting a value range of soil layer parameters, and re-layering the crushed stone soil layers of the stock yard according to the value range;
fifthly, determining average parameters of each broken stone soil layer after the material yard is layered again; in this embodiment, the preparation strength of the gravel soil is set to be not satisfactory, and the gravel soil in this state has poor preparation strength and needs to be prepared quickly, so that the problems of inconsistent natural gradation, inconsistent preparation strength and slightly low natural water content are solved.
Sixthly, calculating a blending ratio and a water adding amount by combining the parameters of the gravel layer and the optimal water content of the impermeable soil material required by the high earth-rock dam filling area;
the method for calculating the blending ratio comprises the following steps:
(1) measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
(2) determining the blending volume of the gravel soil layer, and setting the blending volume as a first volume;
(3) determining the blending volume of the clay layer, and setting as a second volume:
wherein, V1Is a first volume, V2Is the second volume, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
the method for calculating the water adding amount comprises the following steps:
(1) obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
(2) determining the optimal water content of the impermeable soil;
(3) determining a first volume and a second volume, and calculating the water addition:
L＝(Q3+Q4)w0-Q3(w1-w')-Q4(w2-w'), wherein L is the amount of water added, Q3Is a first volume, Q4Is the second volume, w1Is the average natural water content, w, of the gravel soil layer2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
Seventhly, mixing and blending in a blending field according to the calculation result and adding water to adjust the content of P5 and the water content; the construction method comprises the following steps:
(1) determining the water adding amount according to the optimal water content, and mixing and stirring the water adding amount, the first volume of the gravel soil and the second volume of the clay;
in order to accelerate the preparation speed of the crushed soil and the adjustment speed of the water content, in a crushed soil preparation yard, after the prepared crushed soil/clay is stacked, pits are dug in a stacking area to be filled with water, after the water is added, a bulldozer or a loader is used for stacking the crushed soil in a storage bin into a soil pile, and the height of the soil pile is controlled to be about five meters.
(2) And (4) stacking the mixture, setting the water-tight days (less than 7 days to achieve the aim of quick preparation), and carrying out water-tight treatment.
Eighthly, detecting the prepared soil material, and filling the high earth-rock dam if the soil material is qualified; and if the detection is unqualified, acquiring the blended soil parameters again, and then performing the sixth step again.
Example four
In this embodiment, a part of the steps in the first embodiment, the second embodiment, and the third embodiment are explained, and when the seventh step in the above embodiments is performed, it is necessary to excavate a crushed rock layer or a clay layer, and this embodiment provides an excavation method:
when the mining mode is selected, factors such as dam material property, stock ground topography, mining machines, material layer distribution, material layer thickness, natural water content of the gravelly soil, hydrogeology and the like are considered, and vertical mining or plane mining including inclined mining is determined. The mixed mining of the combination of the inclined plane and the vertical plane is suitable for the residual wind and chemical materials of the gravelly soil or the slope.
When the water adding operation of the seventh step is performed: the steel pipe (or reinforced PVC pipe) is connected from the construction water pool and is paved on the charging surface. For convenient operation, a fire hose or a PE hose which is convenient to assemble and disassemble is adopted in the mixing and distributing yard for water delivery, and each hose is provided with a water meter for metering the water adding amount on site accurately. Meanwhile, the total length, the total depth, the total width and the number of the ditches are ready to be measured and calculated, and then the water adding amount required by each ditch is calculated. When water is added, the total amount control is implemented in the range of the cell, and the water is added uniformly as much as possible.
When the operation of water sealing is carried out, the water content is checked in a sampling way, and whether the water adding amount is accurate or not can be known; whether the water diffusion in the material pile is uniform or not can be judged so as to determine the shortest storage time; the change condition of the surface water content of the material pile can be known immediately so as to determine whether the surface of the material pile needs to be supplemented with water.
EXAMPLE five
The present embodiment provides a specific engineering example for using the method.
The maxx hydropower station dam project is one of hectometre high earth and rockfill dams, the hydropower station is located in XXX county of Sichuan province, is a 3 rd step hydropower station developed by a five-level scheme of a second reservoir in hydropower planning of a black river basin, and is a large (2) type hybrid single power generation project. The power station adopts a hybrid development mode, and the head part hub consists of a water retaining building, a spillway and a blow-down hole. The dam adopts a gravelly soil core wall rockfill dam, the maximum dam height is 147.00m, the filling amount is about 1100 km 3, and the gravelly soil core wall is about 157 km 3.
The dam project is formally started in 2008 in 5-1 th, and the contract project in 2012 in 6-30 th is completely completed, wherein the dam is filled to the dam crest elevation in 2011 in 4-30 th, the filling construction period is shortened from 25 months to 17 months in the original contract construction period, and the filling construction period is advanced by 8 months, so the filling strength is greatly improved.
Based on the fact that the non-uniformity of soil mass distribution and the natural water content of a stock ground are far lower than the designed maximum water content, in order to meet the design requirements, the P5 content and the water content are adjusted by blending in a stock ground, and all indexes after blending and filling in a dam meet the design requirements.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. Other variations or modifications may occur to those skilled in the art, which are based on the above-described invention, and which are still within the scope of the invention.
Claims (10)
1. A construction method for blending anti-seepage soil materials of a high earth-rock dam is characterized by comprising the following steps:
determining the position of a stock ground, and sampling a soil layer of the stock ground in the vertical direction;
detecting soil layer parameters including water content, P5 content and clay content according to the sampling data;
determining a clay layer and a gravel soil layer;
setting the value range of soil layer parameters, and demixing the stock ground crushed stone soil layers according to the value range;
determining average parameters of each broken stone soil layer after the re-layering of the stock ground;
calculating a blending ratio and a water adding amount by combining the parameters of the gravel layer and the optimal water content of the impermeable soil material required by the high earth-rock dam filling area;
blending in the blending field layers according to the calculation result and adding water to adjust the content and the water content of P5;
detecting the prepared soil material, and if the soil material is qualified, filling a high earth-rock dam; and re-blending if the detection is unqualified.
2. The soil and earth mixing construction method for the seepage-proofing soil of the high earth-rock dam as claimed in claim 1, wherein the gravel layer in the parameters of the gravel layer of the determined stock yard comprises three states:
the first state: the natural grading of the crushed soil meets the requirements;
and a second state: the natural grading of the crushed soil does not meet the requirement;
when the gravel soil layer is in a first state, adding water into the gravel soil for adjustment;
and when the gravel soil layer is in the second state, carrying out clay blending and water adding adjustment on the gravel soil.
3. The soil and earth blending construction method for the seepage control of the high earth-rock dam as claimed in claim 2, wherein when the gravel layer is in a state one, the construction method comprises the following steps:
paving the gravel soil meeting the requirements to a set thickness;
transversely arranging a plurality of water adding tunnels, wherein the distances between two adjacent water adding tunnels are equal, and the length, the width and the depth of each water adding tunnel are set;
determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
setting the days of water sealing and carrying out water sealing treatment.
4. The construction method for blending the seepage-proofing soil material of the high earth-rock dam as claimed in claim 3, wherein the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of the gravel soil layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining the spreading amount of the gravel soil, and calculating the water adding amount: l ═ Q (w)0-w + w'), wherein L is the amount of water added, Q is the paving amount of the gravel soil, w is the average natural moisture content of the gravel soil layer, w0For optimal moisture content, w' is the water loss error.
5. The high earth and rockfill dam seepage-proofing soil blending construction method according to claim 3 or 4, wherein the set thickness is 3m, the length, width and depth of the watering tunnels are 3m, 1m and 1m respectively, and the distance between two adjacent watering tunnels is 1 m.
6. The construction method for blending the soil seepage-proofing materials of the high earth-rock dam as claimed in claim 2, wherein when the gravel layer is in state two, the construction method comprises the following steps:
measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
determining the paving thickness of the gravel soil layer, and setting the paving thickness as a first thickness;
determining the paving thickness of the clay layer, and setting the paving thickness as a second thickness:
wherein h is1Is a first thickness, h2Is a second thickness, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
paving a gravel soil layer by adopting an occupation method;
paving a clay layer by adopting a retreating method;
transversely arranging a plurality of water adding tunnels, wherein the distances between two adjacent water adding tunnels are equal, and the length, the width and the depth of each water adding tunnel are set;
determining the water adding amount according to the optimal water content, and uniformly distributing the water adding amount into a plurality of water adding tunnels;
setting the days of water-tight treatment and carrying out water-tight treatment.
7. The construction method for blending the seepage-proofing soil material of the high earth-rock dam as claimed in claim 6, wherein the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining the spreading amount of the gravel soil and the spreading amount of the clay layer, and calculating the water adding amount: l ═ Q1+Q2)w0-Q1(w1-w')-Q2(w2-w'), wherein L is the amount of water added, Q1Spreading amount of crushed soil in State two, Q2Spreading amount of clay in State two, w1Is the average natural water content, w, of the gravel soil layer2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
8. The construction method for blending the seepage-proofing soil material of the high earth-rock dam as claimed in claim 6 or 7, wherein the first thickness is 1m, the length, width and depth of the watering tunnels are 3m, 1m and 1m respectively, and the distance between two adjacent watering tunnels is 1 m.
9. The construction method for blending the impermeable soil material of the high earth and rockfill dam as claimed in claim 6, wherein when the gravel soil layer is in state two, and the preparation strength of the gravel soil is not satisfactory, the construction method comprises:
measuring the bulk density of the gravelly soil of the gravel soil layer and the bulk density of the pure clay of the clay layer;
determining the blending volume of the gravel layer, and setting the blending volume as a first volume;
determining the blending volume of the clay layer, and setting as a second volume:
wherein, V1Is a first volume, V2Is the second volume, p1Is the bulk density of the crushed rock, p2Is the bulk density of the pure clay;
determining the water adding amount according to the optimal water content, and mixing and stirring the water adding amount, the first volume of the gravel soil and the second volume of the clay;
and accumulating the mixture, setting the days of water sealing, and carrying out water sealing treatment.
10. The construction method for blending the seepage-proofing soil material of the high earth-rock dam as claimed in claim 9, wherein the method for determining the water adding amount comprises the following steps:
obtaining the average natural water content of a gravel soil layer and the average natural water content of a clay layer after laboratory measurement;
determining the optimal water content of the impermeable soil material;
determining a first volume and a second volume, and calculating the water addition: l ═ Q3+Q4)w0-Q3(w1-w')-Q4(w2-w'), wherein L is the amount of water added, Q3Is a first volume, Q4Is the second volume, w1Is the average natural water content, w, of the gravel soil layer2Is the average natural water content, w, of the clay layer0For optimal moisture content, w' is the water loss error.
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