CN111253046A - Treatment method of foundation pit hydrous rock soil - Google Patents
Treatment method of foundation pit hydrous rock soil Download PDFInfo
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- CN111253046A CN111253046A CN202010176901.1A CN202010176901A CN111253046A CN 111253046 A CN111253046 A CN 111253046A CN 202010176901 A CN202010176901 A CN 202010176901A CN 111253046 A CN111253046 A CN 111253046A
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- absorbing material
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- 239000002689 soil Substances 0.000 title claims abstract description 76
- 239000011435 rock Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000011358 absorbing material Substances 0.000 claims abstract description 37
- 239000002002 slurry Substances 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 claims abstract description 22
- 230000000740 bleeding effect Effects 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 239000004927 clay Substances 0.000 claims description 15
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 239000002699 waste material Substances 0.000 abstract description 30
- 239000000463 material Substances 0.000 abstract description 24
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 206010015866 Extravasation Diseases 0.000 description 1
- 229920000034 Plastomer Polymers 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000036251 extravasation Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a method for treating foundation pit hydrous rock soil, which comprises the following steps: firstly testing the water content of the hydrous rock soil to be treated, and obtaining a primary water absorbing material addition range according to the water content of the hydrous rock soil; adding a water-absorbing material into the water-containing rock soil, and then testing the bleeding rate and the slump of the water-containing rock soil; finally, giving out the change curves of the bleeding rate and the slump power and the actual effect pictures under different water-absorbing material addition amounts in different hydrous rock and soil; the rock and soil mass needing to be treated basically has no fluidity and does not generate bleeding phenomenon after standing for a certain time. The technology can reduce the water content of the waste soil and the waste slurry in a very short time, thereby avoiding the problem of site occupation; the used materials are environment-friendly and cannot damage the ecology; the water absorption material is little in addition amount, and the transportation cost is low.
Description
Technical Field
The invention belongs to the technical field of hydrous rock-soil treatment, and particularly relates to a treatment method of foundation pit hydrous rock-soil.
Background
Along with the continuous promotion of the urbanization process of China, the contradiction between urban construction and land, resources, energy sources and environment is more and more obvious, and mud represented by mud, silt, sludge and tailing mud occupies the land, so that the serious pollution of soil and water bodies is caused, such as porridge-shaped and flow-plastic-shaped silt which can not be avoided in water conservancy projects, shipping projects and water environment treatment projects; sewage treatment plants produce tens of thousands of tons of sludge; the method comprises the following steps of (1) inevitably producing slurry by geotechnical engineering underground continuous walls, cast-in-situ bored piles, trenchless horizontal directional drilling, slurry balanced jacking pipes and slurry pressurized shields; underground mud-water mixture for petroleum drilling and exploitation; high water content and plastic tail slime produced by mineral engineering water-method ore dressing or ore washing operation. The waste soil and the waste slurry occupy a large amount of land resources for stacking, and influence the ecological environment. Higher moisture content makes the useless thick liquid of engineering waste soil difficult to carry, very big increase workman's work load and cost of transportation, still can produce the hourglass problem of spilling in the transportation nevertheless.
A large amount of waste soil and waste slurry with high water content generated in the existing engineering construction are basically produced by excavating a sedimentation tank or piling and airing in the open space of a construction site, and after a part of water is evaporated, the waste soil and waste slurry are transported to a waste soil yard or a suburb by a tank car or an earth moving vehicle and are discarded. However, the speed of evaporating water by stacking and airing is slow and is influenced by weather and air humidity; the soil mass after being piled up and aired still contains a large amount of free water, so that the transportation cost is directly increased; in the transportation process, water in the soil body can spill from the transport vehicle to pollute the environment.
The inorganic curing agent is used for curing, which is a common treatment method for high-water-content waste soil and waste slurry in current engineering construction. The inorganic curing agent is suitable for waste soil with high solid content, and is easy to obtain raw materials, low in price, non-toxic, free of secondary pollution, high in strength after curing, high in stability, resistant to erosion, high in seepage resistance and relatively popularized and used at present. The method has the advantages that the addition amount of the inorganic curing agent is large, the volume of the cured inorganic curing agent is large, and the large amount of the inorganic curing agent causes extra transportation cost; the effect of the inorganic curing agent can be influenced in rainy and snowy days; in addition, the inorganic curing agent can have adverse effects on the environment, damage the vegetation on the ground and easily cause water and soil loss.
Disclosure of Invention
Aiming at the technical problems, the invention provides a method for treating the hydrous rock soil of the foundation pit, which achieves the effect of quickly and stably adsorbing water molecules in the soil body within 30-60min by adding a water-absorbing material WM-1 into the waste soil and waste slurry generated by excavation of the foundation pit, improves the plastic limit and the liquid limit of the hydrous rock soil, changes the flow state into a plastic state, and achieves the purposes of loading and transportation, no liquid extravasation on a transportation road and slag soil field energy receiving. The material is environment-friendly and pollution-free, can greatly reduce the water content of the soil body, is convenient for carrying the soil body, reduces the transportation cost, and can avoid the water in the soil body from spilling and leaking in the transportation process; the processed rock soil can also be backfilled to be used as engineering filler. The invention provides different adding modes and different adding amounts aiming at different water-bearing rock soil and shows the treatment effect.
A method for treating foundation pit hydrous rock soil comprises the following steps:
firstly testing the water content of the hydrous rock soil to be treated, and obtaining a primary water absorbing material addition range according to the water content of the hydrous rock soil;
adding a water-absorbing material into the water-containing rock soil, and then testing the bleeding rate and the slump of the water-containing rock soil;
finally, giving out the change curves of the bleeding rate and the slump power and the actual effect pictures under different water-absorbing material addition amounts in different hydrous rock and soil;
in the treatment process, the water-absorbing material is flexibly selected according to the difficulty of adding the water-absorbing material into the water-containing rock soil, and the water-absorbing material is added into the water-containing rock soil body generated in the excavation of the foundation pit in the adding mode to form a plastic body, so that the rock soil body which needs to be treated basically has no flowability, and does not generate bleeding phenomenon after standing for a certain time.
The water-absorbing material is WM-1 type water-absorbing resin, the theoretical water absorption (deionized water) rate reaches 300-400g/g, and the salt absorption rate reaches 30-50 g/g. The specific components and the preparation method thereof are disclosed in a patent of CN102838714A entitled "a preparation method of straw composite super absorbent resin".
The adding amount range of the water absorbing material is calculated by the mass ratio of the treated hydrous rock soil, and the adding amount of the slurry with the water content of 70-90 percent is 1.2-1.5 percent; saturated clay with water content of 40-60% and the addition amount of 0.4-0.5%; saturated sandy soil with water content of 20-30% and added amount of 0.05-0.08%.
The water content and the fluidity can be reflected to a certain degree by the bleeding rate and the slump, and the two indexes are used as references of treatment effects in the test.
The technical scheme of the invention has the beneficial effects that:
(1) can reduce the water content of the waste soil and the waste slurry in a very short time, and avoid the problem of site occupation.
(2) The used materials are environment-friendly and can not damage the ecology.
(3) The water absorption material is little in addition amount, and the transportation cost is low.
Drawings
FIG. 1-1 is a graph of the water yield of the waste sludge versus the amount of added material in example 1;
FIGS. 1-2 are graphs of slump versus material addition for the waste slurries of example 1;
FIGS. 1-3 are graphs comparing the results of example 1 before and after treatment of waste sludge;
FIG. 2-1 is a graph of the relationship between the bleeding rate of clay and the amount of added clay in example 2;
FIG. 2-2 is a graph of clay slump versus material addition for example 2;
FIGS. 2-3 are graphs comparing the results of clay treatment and pretreatment in example 2;
FIG. 3-1 is the schematic view of the placement of the sandy soil plastic drainage plate in example 3;
FIG. 3-2 is a graph of the sand bleeding rate versus material addition in example 3;
3-3 are plots of sand slump versus material addition for example 3;
FIGS. 3-4 are graphs comparing the results of the sand treatment of example 3 before and after the sand treatment.
Detailed Description
The specific technical scheme of the invention is described by combining the embodiment.
Example 1
Treating waste slurry:
the water content of the waste slurry used for the treatment was 86.1%. Because the waste slurry has very good fluidity, the water absorbing material can be directly mixed into the waste slurry for stirring, the stirring is uniform during the mixing, the generation of agglomerate flocculate is avoided, and the water absorbing material wrapped inside cannot completely exert the water absorbing effect, so that the material waste is caused; therefore, when the water-absorbing material is mixed, the water-absorbing material can be fully contacted with the waste slurry to better play the function of the waste slurry.
And standing for 1h after stirring for 5min, and testing the bleeding rate and slump of the waste slurry. When the addition of the material reaches more than 1.0 percent, the bleeding rate of the slurry is low, and the liquid with fluidity in the slurry plastic body basically disappears after the treatment, as shown in figure 1-1. When the addition amount of the material is 2.5%, the slump of the waste slurry is reduced to 0, and the fluidity of the waste slurry is basically lost, as shown in a figure 1-2.
When the water absorbing material is mixed for 1h, the specific effect is shown in figures 1-3, the left side of the figure shows the effect of not adding the water absorbing material, and the right side of the figure shows the effect of adding 2.5% of the water absorbing material.
Example 2
Clay treatment:
the water content of the hydrous clay used for the treatment was 47.9%. Because the mobility of hydrous clay is better, so also can directly mix the material that absorbs water into wherein stir, will stir and mix the material that absorbs water simultaneously, make resin can obtain abundant contact with hydrous clay, better play its effect.
And (5) stirring for 5min, standing for 1h, and testing the bleeding rate and the slump of the clay. When the material addition amount reaches 0.5%, the bleeding rate of the clay is reduced to 0, and the liquid with fluidity in the clay plastomer basically disappears after the treatment, as shown in figure 2-1. When the addition of the material is 0.5%, the clay slump is reduced to 0, and the fluidity is basically lost, as shown in figure 2-2.
When the water absorbing material is mixed for 1 hour, the specific effect is shown in figures 2-3, the left side of the figure shows the effect of not adding the water absorbing material, and the right side of the figure shows the effect of adding 0.5% of the water absorbing material.
Example 3
Treating sandy soil:
the water content of the saturated sandy soil for treatment is 24.0 percent. Because the fluidity of the saturated sandy soil is poor, the water absorbing material is difficult to be directly mixed into the saturated sandy soil for stirring, and the saturated sandy soil and the water absorbing material can be put into a beaker in a layered mode and then stirred for a short time, so that the saturated sandy soil and the water absorbing material are uniformly mixed, and the effect of the water absorbing material is better exerted.
In the actual construction process, the plastic drainage plates are transversely or vertically inserted according to the stacking condition on site, and resin is uniformly filled into the plastic drainage plates, so that the process of smoothly doping the water-absorbing material into the water-containing soil body is realized, as shown in figure 3-1.
When the water absorbing material is mixed for 1 hour, the bleeding rate and the slump of the water-containing sandy soil are tested. When the addition of the material reaches 0.05%, the bleeding rate of the sandy soil is reduced to 0, and the liquid with fluidity in the sandy soil plastic body basically disappears after the treatment, as shown in a figure 3-2. When the addition of the material is 0.10%, the sand slump is reduced to 0, and the fluidity is basically lost, as shown in figures 3-3.
When the water absorbing material is mixed for 1 hour, the specific effect is shown in figures 3-4, the left side of the figure shows the effect of not adding the water absorbing material, and the right side of the figure shows the effect of adding 0.10% of the water absorbing material.
Results and discussion
The physical properties of different hydrous rock-soil are different, and the ions contained in water in the soil are different, so that the water absorption effect of the water absorption material is greatly influenced, and the water absorption effect of the water absorption material in different hydrous rock-soil is different. The feasibility of the water-absorbing material for the foundation pit rock soil with high water content is proved by processing a plurality of common water-containing rock soils. The water-absorbing material is fully contacted with water in the hydrous rock soil, so that the water in the soil body can be well absorbed, the water content of the hydrous rock soil is reduced, and the aim of the invention is achieved.
According to test analysis, the addition of materials is recommended to be 1.2-1.5% for the slurry with the water content of 70-90%; saturated clay with water content of 40-60%, and recommended material addition of 0.4-0.5%; the recommended addition of the material is 0.05-0.08% of saturated sandy soil with the water content of 20-30%. The recommended dosage is added, so that the surface of the soil body basically has no bleeding, and the transportation is convenient.
Claims (2)
1. A method for treating foundation pit hydrous rock soil is characterized by comprising the following steps:
firstly testing the water content of the hydrous rock soil to be treated, and obtaining a primary water absorbing material addition range according to the water content of the hydrous rock soil;
adding a water-absorbing material into the water-containing rock soil, and then testing the bleeding rate and the slump of the water-containing rock soil;
finally, giving out the change curves of the bleeding rate and the slump power and the actual effect pictures under different water-absorbing material addition amounts in different hydrous rock and soil;
the rock and soil mass needing to be treated basically has no fluidity and does not generate bleeding phenomenon after standing for a certain time.
2. The method for treating the hydrous rock soil of the foundation pit according to claim 1, wherein the adding amount of the water absorbing material is calculated by the mass ratio of the treated hydrous rock soil, and the adding amount of the slurry with the water content of 70% -90% is 1.2% -1.5%; saturated clay with water content of 40-60% and the addition amount of 0.4-0.5%; saturated sandy soil with water content of 20-30% and added amount of 0.05-0.08%.
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| CN202010176901.1A CN111253046A (en) | 2020-03-13 | 2020-03-13 | Treatment method of foundation pit hydrous rock soil |
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| CN202010176901.1A CN111253046A (en) | 2020-03-13 | 2020-03-13 | Treatment method of foundation pit hydrous rock soil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115650690A (en) * | 2022-09-06 | 2023-01-31 | 南京理工大学 | Novel composite polymer shield muck curing agent |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838714A (en) * | 2012-10-15 | 2012-12-26 | 成都理工大学 | Preparation method of straw composite super absorbent resin |
| CN108218317A (en) * | 2018-01-19 | 2018-06-29 | 湖北工业大学 | A kind of high-moisture percentage sullage solidifying method |
| CN110092636A (en) * | 2018-01-29 | 2019-08-06 | 郑敏 | A kind of composite material and its application method for shield discarded slurry environmental protection treatment |
| CN110563298A (en) * | 2019-07-29 | 2019-12-13 | 辛巧玲 | Municipal sludge dewatering treatment method |
-
2020
- 2020-03-13 CN CN202010176901.1A patent/CN111253046A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102838714A (en) * | 2012-10-15 | 2012-12-26 | 成都理工大学 | Preparation method of straw composite super absorbent resin |
| CN108218317A (en) * | 2018-01-19 | 2018-06-29 | 湖北工业大学 | A kind of high-moisture percentage sullage solidifying method |
| CN110092636A (en) * | 2018-01-29 | 2019-08-06 | 郑敏 | A kind of composite material and its application method for shield discarded slurry environmental protection treatment |
| CN110563298A (en) * | 2019-07-29 | 2019-12-13 | 辛巧玲 | Municipal sludge dewatering treatment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115650690A (en) * | 2022-09-06 | 2023-01-31 | 南京理工大学 | Novel composite polymer shield muck curing agent |
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Application publication date: 20200609 |
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