CN111350209A - Curing agent-silt soil mixed cushion layer for site anti-seepage treatment - Google Patents
Curing agent-silt soil mixed cushion layer for site anti-seepage treatment Download PDFInfo
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- CN111350209A CN111350209A CN201811582650.6A CN201811582650A CN111350209A CN 111350209 A CN111350209 A CN 111350209A CN 201811582650 A CN201811582650 A CN 201811582650A CN 111350209 A CN111350209 A CN 111350209A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/002—Ground foundation measures for protecting the soil or subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/004—Sealing liners
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Abstract
The invention relates to a curing agent-silt soil mixed cushion layer for site anti-seepage treatment, which comprises a plain soil compaction layer, a bottom layer, a gravel layer, a middle layer, a sand cushion layer and a surface layer which are paved layer by layer from bottom to top, wherein the bottom layer, the middle layer and the surface layer are all paved by cured anti-seepage soil. The solidified impervious soil is prepared by mixing clay and dredged silt, adding a soil solidifying agent, mixing and sealing materials; the invention has simple structure, convenient construction and advanced and scientific method, can not only reduce dredging sludge and earthwork outward transportation, but also can well solve the problem that the underground environment is polluted by leachate generated in the sludge dredging process.
Description
Technical Field
The invention relates to the field of sludge treatment, in particular to a curing agent-silt soil mixed cushion layer for site anti-seepage treatment.
Background
With the rapid development of urban industrialization, a large amount of untreated domestic sewage and industrial wastewater are discharged into rivers and lakes, accumulate for a long time, and deposit a layer of thick sludge below the rivers and lakes, wherein the sludge usually contains pollutants such as ammonia nitrogen, heavy metals and the like exceeding the standards, so that the self-cleaning capacity of a water body is reduced, the water quality is deteriorated, blackened and smelly. At present, the chemical in-situ curing treatment method has wide application range, low cost and convenient construction process, and is a treatment method which is more suitable for the national conditions of China.
The chemical in-situ solidification method for treating the sludge needs to firstly clear the sludge from a river to a bank for sludge piling and draining, and reduces the water content of the sludge by a natural evaporation and natural sedimentation method, otherwise, the water content of the sludge is too high, and the chemical solidification effect is not ideal. The sludge with high water content is stacked in a sludge storage yard, high-concentration polluted wastewater can be generated, and the wastewater can penetrate through soil in a diffusion mode, so that the underground environment is polluted. In the traditional treatment method, a geosynthetic material is usually adopted, the geosynthetic material can improve the impermeability of a soil body, but the raw material is a high molecular polymer, a large amount of energy is consumed in production, and a large amount of pollutants are generated at the same time, so that energy consumption and environmental pollution are caused, and therefore, a low-carbon environment-friendly material needs to be searched for replacing today when sustainable development is strongly promoted.
Disclosure of Invention
The invention aims to solve the technical problem of providing a curing agent-silt soil mixed cushion layer for site seepage-proofing treatment, so as to overcome the defects in the prior art.
The technical scheme for solving the technical problems is as follows: a curing agent-silt soil mixed cushion layer for site anti-seepage treatment comprises a plain soil compaction layer, a bottom layer, a gravel layer, a middle layer, a sand cushion layer and a surface layer which are paved layer by layer from bottom to top, wherein the bottom layer, the middle layer and the surface layer are all paved by cured anti-seepage soil.
In the scheme, the compaction degree of the rammed plain soil layer is greater than 90%, and the compaction degrees of the bottom layer, the middle layer and the surface layer are all greater than 93%.
In the scheme, the solidified impermeable soil is prepared by mixing and modifying clay, dredged sludge and a soil curing agent.
In the scheme, the solidified impermeable soil comprises 35-45% of clay, 45-55% of dredged sludge and 5-12% of soil solidifying agent.
In the scheme, the solidified impermeable soil is prepared by the following steps:
mixing and stirring the clay and the dredged sludge, adding the soil curing agent, uniformly stirring, and then sealing the materials for 24-72 h.
In the scheme, clay contains 30-40% of clay particles and 60-70% of powder particles, wherein the particle size of the clay particles is less than 0.005mm, and the particle size of the powder particles is 0.005mm-0.075 mm.
In the scheme, the dredged sludge is sludge which is dredged from river bottom and has the water content of lower than 40-45% after natural draining.
In the scheme, the water content of the solidified impermeable soil is 20-30%.
In the scheme, the gravel layer comprises 35-45% of gravel with the granularity of 1-3 cm and 50-60% of gravel with the granularity of 3-5 cm.
In the scheme, the sand cushion layer comprises 25-35% of fine sand grains, 5-15% of medium sand grains and 55-65% of coarse sand grains, wherein the grain size of the fine sand grains is 0.075-0.25 mm, the grain size of the medium sand grains is 0.25-0.5 mm, and the grain size of the coarse sand grains is 0.5-2 mm.
The invention has the beneficial effects that:
1) one of the used raw materials is the dredged sludge generated after the dredging of rivers and lakes, so that the disposal problem of the dredged sludge is well solved, and the problem that the underground environment is polluted by leachate generated in the dredging process of the sludge can be well solved;
2) the dredged sludge has certain anti-permeability performance, and the anti-permeability performance of the clay can be improved by adding the dredged sludge into the clay;
3) after the mixed soil is modified and cured by adding the soil curing agent, the cracking problem caused by water loss of the clay cushion layer can be avoided, and the seepage-proofing performance can be improved by the cementing reaction of the soil curing agent after meeting water;
4) the anti-seepage device has excellent anti-seepage performance, simple structure and low price, can be used for locally obtaining materials, reduces the time and the transportation cost for transporting dredged sludge and earthwork, shortens the construction time, and does not cause secondary pollution to the environment;
5) solidified impermeable soil is used as an impermeable layer, crystals are formed in the soil through cementing reaction of solidified materials, so that the problem that when the compacted clay is singly used, the impermeable performance is poor due to cracks caused by water loss is avoided, and each layer of impermeable material is isolated by a gravel layer and a sand cushion layer, so that the impermeable effect is improved.
Drawings
FIG. 1 is a schematic structural view of a curing agent-sludge soil mixed cushion layer for site seepage prevention treatment according to the present invention;
FIG. 2 is a construction method of a curing agent-silt soil mixed cushion layer for site anti-seepage treatment.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
As shown in figure 1, the curing agent-silt soil mixed cushion for site anti-seepage treatment comprises a plain soil compacted layer 1, a bottom layer 2, a crushed stone layer 3, a middle layer 4, a sand cushion layer 5 and a surface layer 6 which are paved layer by layer from bottom to top, wherein the bottom layer 2, the middle layer 4 and the surface layer 6 are all paved by cured anti-seepage soil.
The solidified impervious soil is prepared by mixing and modifying clay, dredging sludge and a soil curing agent, wherein the clay accounts for 35-45 percent of the solidified impervious soil, the dredging sludge accounts for 45-55 percent of the solidified impervious soil, and the soil curing agent accounts for 5-12 percent of the solidified impervious soil. The compaction degrees of the bottom layer 2, the middle layer 4 and the surface layer 6 are all more than 93 percent, the compaction degree of the rammed earth layer is more than 90 percent, and the thicknesses of the bottom layer 2, the middle layer 4 and the surface layer 6 are all 15cm-25cm, preferably 20 cm.
The solidified impermeable soil is prepared by the following steps:
mixing and stirring 35-45% of clay and 45-55% of dredged sludge according to the mass fraction, adding 5-12% of soil curing agent, uniformly stirring, and sealing the materials for 24-72 h, preferably 48h to obtain the solidified impermeable soil, wherein the water content of the solidified impermeable soil is 20-30%, preferably 40% of clay, 50% of dredged sludge, 10% of soil curing agent and 25% of solidified impermeable soil.
The clay contains 30-40% of clay grains, 60-70% of powder grains, the particle size of the clay grains is less than 0.005mm, the particle size of the powder grains is 0.005mm-0.075mm, the dredged sludge is sludge which is dredged from river bottom and has water content of less than 40-45% after natural draining, and the soil curing agent is the curing agent described in the patent with the application number of CN98113594.3, and the soil curing agent is the prior art, so the proportion and the components of the soil curing agent are not described in detail, and the proportion and the components can be determined by looking up the patent in the actual construction process.
The gravel layer 3 comprises 35-45% of gravel with the granularity of 1-3 cm, 50-60% of gravel with the granularity of 3-5 cm, and the thickness of the gravel layer 3 is 3-7 cm, preferably, the gravel layer 3 comprises 40% of gravel with the granularity of 1-3 cm, 60% of gravel with the granularity of 3-5 cm, and the thickness of the gravel layer is 5 cm.
The sand cushion layer 5 comprises 25-35% of fine sand grains, 5-15% of medium sand grains and 55-65% of coarse sand grains, the grain size of the fine sand grains is 0.075-0.25 mm, the grain size of the medium sand grains is 0.25-0.5 mm, the grain size of the coarse sand grains is 0.5-2 mm, the thickness of the sand cushion layer 5 is 3-7 cm, and preferably, the sand cushion layer 5 comprises 30% of fine sand grains, 10% of medium sand grains and 60% of coarse sand grains, and the thickness is 5 cm.
As shown in fig. 2, a construction method of a curing agent-sludge soil mixed cushion layer for site anti-seepage treatment comprises the following steps:
excavating a clay-sludge modified curing mixing point beside a site needing to be paved with a curing agent-sludge mixed cushion layer by using an excavator, uniformly mixing the clay and the dredged sludge according to a mass ratio, adding a soil curing agent for stuffing for 24-72 h, and controlling the water content of the cured impermeable soil with the stuff to be 20-30% so as to achieve the purposes of making the clay into a mass by hand and dispersing the clay and the dredged sludge by lightly kneading the two hands;
paying off according to the designed elevation of the site, digging 50cm downwards by using a level gauge according to the designed elevation, digging enough size for the slope-releasing section by using a small excavator, and manually leveling and fine-trimming;
leveling and finishing the plane layer by using a bulldozer and a level gauge, compacting the plain soil compacted layer 1 by using a road roller (heavy type), manually compacting the part which can not be compacted by the road roller, wherein the compaction degree is not less than 90%, and watering the plain soil compacted layer 1 to keep moist but not to accumulate water;
paving a bottom layer 2, loading the solidified impermeable soil into a dump truck by using an excavator, conveying the dump truck into a field, paving by using a loader in combination with manpower, wherein the loose paving thickness is 25cm-35cm, then rolling the solidified impermeable soil by using a road roller, manually tamping the parts which can not be rolled by the road roller, and finishing the paving of the bottom layer 2, wherein the thickness of the compacted bottom layer 2 is 15cm-25cm, and the compaction degree is not lower than 93%;
after the bottom layer 2 is paved, a gravel layer 3 is paved, gravel according to the grading requirement is uniformly paved on the field by a loader and compacted by a road roller, and the thickness of the compacted gravel layer 3 is 3cm-7 cm;
the middle layer 4 is laid on the crushed stone layer 3, and the working procedure is the same as that of the bottom layer 2;
after the middle layer 4 is paved, a sand cushion layer 5 is paved, sand according to requirements is uniformly paved on the field by a loader and compacted by a road roller, and the thickness of the compacted sand cushion layer 5 is 3cm-7 cm;
the surface course 6 is laid on the sand cushion 5, and the working procedure is the same as that of the bottom course 2.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The curing agent-silt soil mixed cushion layer for the site anti-seepage treatment is characterized by comprising a plain soil compaction layer, a bottom layer, a gravel layer, a middle layer, a sand cushion layer and a surface layer which are paved layer by layer from bottom to top, wherein the bottom layer, the middle layer and the surface layer are all paved by cured anti-seepage soil.
2. The curing agent-silt soil mixed cushion layer for site anti-seepage treatment according to claim 1, wherein the degree of compaction of the rammed earth layer is more than 90%, and the degree of compaction of the bottom layer, the middle layer and the surface layer is more than 93%.
3. The solidified agent-sludge soil mixed cushion layer for site seepage control treatment as claimed in claim 1, wherein the solidified seepage control soil is prepared by mixing and modifying clay, dredged sludge and soil solidifying agent.
4. The curing agent-sludge soil mixed cushion for site seepage control treatment as claimed in claim 3, wherein the curing seepage control soil comprises 35% -45% of clay, 45% -55% of dredging sludge and 5% -12% of soil curing agent.
5. The curing agent-silt soil mixed cushion layer for site impermeable treatment according to claim 4, wherein the curing impermeable soil is prepared by the following steps:
mixing and stirring the clay and the dredged sludge, adding the soil curing agent, uniformly stirring, and then sealing the materials for 24-72 h.
6. The curing agent-silt soil mixed cushion for site seepage control treatment according to any one of claims 3 to 5, wherein the clay comprises 30 to 40 percent of clay particles and 60 to 70 percent of powder particles, the particle size of the clay particles is less than 0.005mm, and the particle size of the powder particles is 0.005mm to 0.075 mm.
7. The curing agent-sludge soil mixed mat for the site anti-seepage treatment as claimed in any one of claims 3 to 5, wherein the dredged sludge is sludge dredged from river bottom and having a water content of less than 40% to 45% after natural draining.
8. The curing agent-silt soil mixed mat layer for site seepage control treatment according to any one of claims 1 to 5, wherein the moisture content of the cured seepage control soil is 20 to 30%.
9. The curing agent-sludge soil mixed cushion for site impermeable treatment as claimed in claim 1, wherein the crushed stone layer comprises 35% -45% of crushed stones with a granularity of 1cm-3cm and 50% -60% of crushed stones with a granularity of 3cm-5 cm.
10. The curing agent-silt soil mixed cushion for site anti-seepage treatment according to claim 1, wherein the sand cushion comprises 25-35% of fine sand grains, 5-15% of medium sand grains and 55-65% of coarse sand grains, the fine sand grains have a grain size of 0.075mm-0.25mm, the medium sand grains have a grain size of 0.25mm-0.5mm, and the coarse sand grains have a grain size of 0.5mm-2 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811582650.6A CN111350209A (en) | 2018-12-24 | 2018-12-24 | Curing agent-silt soil mixed cushion layer for site anti-seepage treatment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811582650.6A CN111350209A (en) | 2018-12-24 | 2018-12-24 | Curing agent-silt soil mixed cushion layer for site anti-seepage treatment |
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| CN111350209A true CN111350209A (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2797281C1 (en) * | 2022-11-07 | 2023-06-01 | Федеральное государственное автономное образовательное учреждение высшего образования "Северный (Арктический) федеральный университет имени М. В. Ломоносова" | Waste storage method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179393A (en) * | 2011-01-30 | 2011-09-14 | 安徽中南环保科技研究所 | Method for landfill treatment |
| CN107829448A (en) * | 2017-11-15 | 2018-03-23 | 江苏和合环保集团有限公司 | A kind of antiseepage course for refuse landfill bottom |
| CN107882075A (en) * | 2017-10-17 | 2018-04-06 | 中国科学院武汉岩土力学研究所 | A kind of method that refuse landfill seepage control layer is built using river and lake silt |
-
2018
- 2018-12-24 CN CN201811582650.6A patent/CN111350209A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179393A (en) * | 2011-01-30 | 2011-09-14 | 安徽中南环保科技研究所 | Method for landfill treatment |
| CN107882075A (en) * | 2017-10-17 | 2018-04-06 | 中国科学院武汉岩土力学研究所 | A kind of method that refuse landfill seepage control layer is built using river and lake silt |
| CN107829448A (en) * | 2017-11-15 | 2018-03-23 | 江苏和合环保集团有限公司 | A kind of antiseepage course for refuse landfill bottom |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2797281C1 (en) * | 2022-11-07 | 2023-06-01 | Федеральное государственное автономное образовательное учреждение высшего образования "Северный (Арктический) федеральный университет имени М. В. Ломоносова" | Waste storage method |
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Application publication date: 20200630 |