CN111501729A - Vacuum preloading drainage consolidation method for silt titanium dioxide tailings - Google Patents
Vacuum preloading drainage consolidation method for silt titanium dioxide tailings Download PDFInfo
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- CN111501729A CN111501729A CN202010328229.3A CN202010328229A CN111501729A CN 111501729 A CN111501729 A CN 111501729A CN 202010328229 A CN202010328229 A CN 202010328229A CN 111501729 A CN111501729 A CN 111501729A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
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- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of tailing pond safety, and particularly discloses a method for vacuum preloading drainage consolidation of silt titanium white tailings. The safety of the tailing pond is improved, and the shear strength of the titanium white mud cross plate and the bearing capacity of a field foundation are obviously improved after the vacuum preloading treatment through the construction effect detection. The method has the advantages of low cost, high safety and capability of saving the vacuum preloading treatment cost by more than one time compared with the treatment cost of methods such as surcharge preloading and the like. The construction process is simple, the requirement on equipment is not high, the cost is low, and the long-term stability of the titanium white mud warehouse can be effectively improved. The method has wide application range, and is not only suitable for the tailing pond in the arid area, but also suitable for the tailing pond in the rainy area in the south.
Description
Technical Field
The invention belongs to the technical field of tailing pond safety, and particularly relates to a vacuum preloading drainage consolidation method for silt titanium dioxide tailings.
Background
The titanium white tailings are waste produced in the process of producing titanium white, are usually discharged in the form of waste liquid, have high content of water-soluble salt and organic matter, and have the characteristics of high water content, high compressibility, low water permeability, low mechanical strength and the like. The titanium dioxide mud deposited in the tailing pond is mostly in a flow molding-soft molding state, if the titanium dioxide mud is not properly treated, the long-term stability of the tailing pond cannot be guaranteed, and the beach surface can generate large uneven settlement within a long time, so that the safety and the stability of the tailing pond are not facilitated. Once the dam break accident happens to the tailing pond, huge life and property losses are caused to downstream residents, and the downstream ecological environment is seriously damaged.
Although the vacuum preloading method is successfully applied to the soft soil treatment of dam projects such as coastal areas, rivers, lakes and the like in China, the titanium white mud has great difference with the soft soil distributed in the coastal areas, the rivers and the lakes in nature. The soft soil distributed in the seas, rivers and lakes is formed by long-term scouring and weathering of rocks by water flow; the titanium white mud is formed by depositing waste liquid discharged in the chemical production process of titanium white. At present, no effective treatment method is proposed for titanium white mud at home and abroad.
Disclosure of Invention
The invention provides a method for consolidating silt titanium dioxide tailings by vacuum preloading drainage, which can overcome the problems and provide a solution for increasing the safety of a tailings pond. The main innovation is that the vacuum preloading method is applied to the titanium white mud drainage consolidation treatment. The method is implemented specifically as follows: the silt titanium dioxide tailings are consolidated by utilizing vacuum preloading drainage, and the safety of a tailing pond is improved.
The technical scheme of the invention is realized as follows:
a vacuum preloading drainage consolidation method for silt titanium dioxide tailings comprises the following steps:
1) partitioning the shoal surface of the titanium white tailing pond;
2) construction measurement;
measuring temporary control points of each subarea;
3) laying geotextile and geogrid;
laying a layer of 400g/m on the upper part of each subarea2The upper part of the geotextile is paved with a geogrid;
4) laying a sand cushion layer;
uniformly paving a sand cushion layer with the thickness of 0.5m on the geogrid;
5) arranging a plastic drainage plate;
a) using a total station and a steel ruler to punch a plate position on the drainage plate of each subarea, and using bamboo sticks or drainage plate cores and the like to insert a sand cushion layer for marking;
b) moving the plate inserting machine to position, and installing a drainage plate pile shoe;
c) inserting a drainage plate to the sand cushion layer; setting the perpendicularity deviation within +/-1.5%, wherein the length of each return belt is not more than 50 cm;
d) pulling the pile pipe upwards until the lower end of the pile pipe is 50cm higher than the sand cushion layer surface;
e) cutting the drain board to ensure that the length of the drain pipe extending out of the sand cushion layer is not less than 20 cm;
f) the machine is moved to carry out the construction of the next drainage plate;
g) after the construction of each partition plastic drainage plate is completed, the holes formed when the drainage plate is arranged are backfilled by sand, and the plate head of the drainage plate is embedded in the sand cushion;
6) arranging a clay sealing wall;
separating the construction area and the non-construction area of each subarea by using a clay sealing wall to ensure that the construction area is in a closed state;
7) laying a filter pipe;
laying filter pipes in each partition, wherein the transverse spacing of the filter pipes is 4m, the longitudinal spacing of the filter pipes is 20m, and the filter pipes are connected through a tee joint or a four-way joint;
8) leveling the field;
after laying the filter pipes, burying the exposed plastic drainage plate below the sand surface, and filling the holes formed when the plastic drainage plate is inserted;
9) excavating a film pressing ditch;
excavating a film pressing ditch at the boundary of each subarea;
10) laying geotextile and sealing film;
laying non-woven geotextile on a flat field, and then laying a sealing film, wherein the periphery of the sealing film is arranged in the film pressing ditch;
11) connecting vacuum-pumping equipment;
horizontally installing a vacuum pump in the construction area of each subarea;
12) vacuum preloading and air exhaust;
checking and repairing air leakage;
13) vacuumizing and maintaining;
and (5) carrying for 90 days in the vacuum preloading area to finish the consolidation of the silty titanium dioxide tailings.
Further, the area of the partition is 2000m2。
Furthermore, the plastic drainage plate is a C-shaped plate, the distance between the C-shaped plate and the plastic drainage plate is 1m, and the plastic drainage plate is arranged in a regular triangle or quincunx shape; the length of the plastic drainage plate embedded in the sand cushion layer is not less than 0.3 m.
Furthermore, the insertion depth of the sealing wall is not less than 1.0m, the wall thickness of the sealing wall is not less than 1.2m, the clay content is more than 15%, and the permeability coefficient is less than 1 × 10-5cm/s。
Furthermore, a plurality of small holes are formed in the wall of the filter tube, the interval between the small holes is 5cm, the diameter of each small hole is 8-10 mm, and the small holes are arranged in a quincunx shape or a square shape.
Further, the surface of the filter tube is coated with filter cloth which is 150g/m2And (5) needling the filament into the geotextile.
Furthermore, the excavation depth of the film pressing ditch is not less than 1.0m, the side slope of the film pressing ditch is smooth and has no sharp object, and the gradient is 1: 1.
Furthermore, the sealing film is divided into two layers, and the thickness of each layer is 0.12-0.16 mm.
The invention provides a vacuum preloading drainage consolidation method for silty titanium dioxide tailings, which has the following advantages:
1) the invention provides a method for consolidating titanium white mud, fills the blank in the aspect of treating the titanium white mud by a vacuum preloading method, and improves the long-term safety and stability of a titanium white tailing pond.
2) The safety of the tailing pond is improved, and the shear strength of the titanium white mud cross plate and the bearing capacity of a field foundation are obviously improved after the vacuum preloading treatment through the construction effect detection.
3) The method has the advantages of low cost, high safety and capability of saving the vacuum preloading treatment cost by more than one time compared with the treatment cost of methods such as surcharge preloading and the like.
4) The construction process is simple, the requirement on equipment is not high, the cost is low, and the long-term stability of the titanium white mud warehouse can be effectively improved.
5) The method has wide application range, and is not only suitable for the tailing pond in the arid area, but also suitable for the tailing pond in the rainy area in the south.
Drawings
FIG. 1 is a schematic plan arrangement diagram of a vacuum preloading drainage consolidation method for silt titanium dioxide tailings;
FIG. 2 is a schematic sectional structure diagram of a vacuum preloading drainage consolidation method for silt titanium dioxide tailings.
In the figure: 1. a plastic drain board; 2. a control point; 3. sealing the trench; 4. sealing the wall; 5. geotextile; 6. a geogrid; 7. a sand cushion layer; 8. a filter tube; 9. a sealing film; 10. tailing slurry; 11. a clay layer.
Detailed Description
With reference to fig. 1-2, the invention provides a vacuum preloading drainage consolidation method for silt titanium dioxide tailings, which comprises the following steps:
1) partitioning the shoal surface of the titanium white tailing pond;
the area of the shoal surface of the titanium white tailing pond is larger, a clay layer 11 is arranged below the shoal surface of the titanium white tailing pond, the operation is carried out in a partition mode, and the partition area is 2000m2。
2) Construction measurement;
and (3) guiding and measuring the designed and determined partition coordinate elevation control points 2 to a construction area by the aid of the theoretical reference points confirmed by repeated measurement by the aid of a GPS (global positioning system), and determining temporary control points of all partitions as temporary control points.
3) Laying geotextile 5 and geogrid 6;
because the surface layer of the beach surface of the tailing pond is mud or sludge, the bearing capacity is extremely low, and great potential safety hazards exist during construction operation. Meanwhile, the horizontal drainage pipeline needs to be separated from sludge on the lower portion of the horizontal drainage pipeline so as to prevent the sludge from blocking a drainage channel and ensure that shallow ultra-soft soil is drained and solidified during vacuumizing. Therefore, a layer of 400g/m is laid on the upper part of the beach surface of the titanium dioxide tailing pond2The geotextile 5 can play a role in separating mud, and the geogrid 6 is laid on the upper portion of the geotextile 5 to play roles in improving mud surface bearing capacity and safety protection measures.
4) Laying a sand cushion 7;
uniformly laying a sand cushion layer 7 with the thickness of 0.5m on the geogrid 6, wherein the sand cushion layer 7 can be used as a construction cushion layer and also can be used as a construction cushion layerIs a drainage cushion layer. The sand cushion layer 7 is 1m3The laying is carried out in a mode of combining a dump truck, an excavator and manpower.
5) Arranging a plastic drainage plate 1;
a) using a total station and a steel ruler to punch a plate position on the drainage plate of each subarea, and using bamboo sticks or drainage plate cores and the like to be inserted into the sand cushion 7 for marking;
b) moving the plate inserting machine to position, and installing a drainage plate pile shoe;
c) inserting the drainage plate to the sand cushion 7; setting the perpendicularity deviation within +/-1.5%, wherein the length of each return belt is not more than 50cm, otherwise, reinserting the drainage plate; wherein, the plastic drainage plate 1 is a C-shaped plate, the distance is 1m, and the plastic drainage plate is arranged in a regular triangle or quincunx shape; the length of the plastic drainage plate 1 embedded into the sand cushion 7 is not less than 0.3m
d) Pulling the pile pipe upwards until the lower end of the pile pipe is 50cm higher than the sand cushion layer by 7 cm; when the pile pipe is pulled up, a constructor needs to carefully observe whether the drainage plate has the phenomenon of belt return, and if the length of the belt return exceeds 50cm, a strip needs to be additionally arranged at a position 20cm away from the plate position;
e) cutting the drain board to ensure that the length of the drain pipe extending out of the sand cushion layer is not less than 20 cm;
f) the machine is moved to carry out the construction of the next drainage plate;
g) after the construction of each sectional plastic drainage plate 1 is completed, the holes formed when the drainage plate is arranged are backfilled by sand, and the plate head of the drainage plate is embedded in the sand cushion 7;
6) a clay sealing wall 4 is arranged;
separating the construction area and the non-construction area of each subarea by using a clay sealing wall 4 to ensure that the construction area is in a closed state;
because the construction areas are provided with the air permeable layers or the water permeable layers, in order to ensure that the construction areas are in a closed state during vacuum preloading, the construction areas and non-construction areas of each subarea are separated by the sealing walls 4, so that the construction areas are in a closed state; wherein the sealing wall 4 must penetrate a permeable layer or a permeable layer.
Wherein the insertion depth of the sealing wall 4 is not less than 1.0m, the wall thickness of the sealing wall 4 is not less than 1.2m, the clay content is more than 15%, and the permeability coefficient is less than 1 × 10-5cm/s to ensure the construction area is denseAnd (4) sealing effect.
7) Laying a filter pipe 8;
laying filter pipes 8 in each partition, wherein the transverse spacing of the filter pipes 8 is 4m, the longitudinal spacing of the filter pipes is 20m, and the filter pipes 8 are connected through a tee joint or a four-way joint; the filter tube 8 is a corrugated filter tube 8 with the drift diameter of phi 80mm, a plurality of small holes are formed in the tube wall of the filter tube 8, the interval between the small holes is 5cm, the diameter of each small hole is 8-10 mm, and the small holes are arranged in a quincunx or square shape.
It is also noted that the surface of the filter tube 8 is wrapped with filter cloth, the filter cloth is 150g/m2The filaments are needled into geotextile 5.
During construction, the filter tube 8 is lifted into the field and placed according to the paying-off position, the filter tube 8 is connected by a tee joint or a cross joint, and the length of the filter tube 8 sleeved in the filter tube is not less than 0.1 m. The joint is tightly bound by sealing glue and lead wires to prevent falling off, and the knot of the lead wires faces downwards. The filter pipe 8 is connected with a vacuum pump through a membrane outlet device and a water absorption rubber pipe and is firmly bound by iron wires, thereby completing the layout of vacuum pipelines. The filter pipe 8 is buried in the sand cushion 7 manually.
8) Leveling the field;
after the filter pipes 8 are laid, the exposed plastic drainage plate 1 is buried below the sand surface, and holes formed when the plastic drainage plate 1 is inserted are filled; the vacuum film is prevented from being punctured by hard objects in the process of vacuumizing, and meanwhile, silt blocks, all sharp and angular hard objects and other impurities on the surface layer are removed, so that the sand surface is tamped and leveled.
9) Excavating a film pressing ditch;
excavating a film pressing ditch at the boundary of each subarea;
when the film pressing ditch is excavated, the excavation depth is at least 1.0m, the excavation depth is 110.5m from the clay layer, the edge of the film pressing ditch is upwards inserted into the sand cushion layer 7, and the insertion amount is more than 0.2 m; and (3) backfilling the sealing ditch 3 and filling the reclamation cofferdam after the sealing film 9 is paved. Covering with water and compacting with vegetable clay. And then setting a surface subsidence mark and installing a film discharging device. The film pressing groove is smooth and has no sharp object, and the gradient is 1: 1.
10) Laying the geotextile 5 and the sealing film 9;
firstly, laying non-woven geotextile 5 on a flat field, and then laying a sealing film 9, wherein the periphery of the sealing film 9 is arranged in a film pressing ditch;
the effect of laying the non-woven geotextile 5 is to protect the sealing membrane 9 and prevent the sealing membrane 9 from being punctured by sharp objects in the sand layer in the air exhaust process.
Wherein, the sealing film 9 is two layers, the thickness of each layer is 0.12-0.16 mm, and the material of the sealing film 9 is a polyethylene film. The sealing film 9 is longitudinally placed on the central axis of a construction area, the sealing film is unfolded from one end to two sides, the presence or absence of a crack opening is carefully checked on the film after the sealing film is laid, and the crack position is timely supplemented by polyethylene glue. The second sealing film 9 is laid after defect-free inspection, and the bonding seams of the two films are staggered as much as possible. The film outlet is provided with a shrinkable and redundant sealing film 9. During construction, all film applying operators should put their feet on or wear shoes with soft soles to prevent the sealing film 9 from being punctured.
After the sealing film 9 is laid, the peripheral sealing film 9 is stepped into the film pressing ditch. The first layer of film is firstly treaded, the treading depth is not less than 1m, and the second layer of film is treaded after the first layer of film is treaded. In the process of stepping on the membrane, the bonding part of the sealing membrane 9 is firstly stepped on, and then other parts are stepped on, so that the sealing membrane 9 is mainly prevented from being torn in the process of stepping on the membrane. After the film is stepped on, clay is filled in the film pressing groove to protect the sealing film 9 stepped on the groove.
11) Connecting vacuum-pumping equipment;
horizontally installing a vacuum pump in the construction area of each subarea; wherein the vacuum pump IS an IS type vacuum pump system. Vacuum pump according to 1000m2The table is arranged and installed. The vacuum pump is horizontally placed on a construction area, and the water inlet and the film outlet of the vacuum pump keep the same plane, so that the vacuum pump can be ensured to exert the maximum effect.
12) Vacuum preloading and air exhaust;
checking and repairing air leakage;
the vacuum pump system is installed (the water pump, the water tank, the gate valve, the stop valve and the film outlet are connected), the vacuum jet pump is debugged in a no-load mode after the electric power room distribution box → the vacuum pump electric leakage switch box → the vacuum pump is switched on, and when the vacuum degree on the vacuum jet pump reaches more than 96kPa, the vacuum jet pump is tried to be vacuumized. The vacuum pressure is gradually increased from 20kPa in the initial stage of vacuum pumping, and the vacuum degree in the film is gradually increased and stabilized above 80kPa along with the discharge of air under the film and the increase of the water discharge consolidation degree of the soil layer. At the stage of starting vacuumizing, the sealing state of the sealing film 9 and the sealing ditch 3 is comprehensively checked along with the discharge of air and water, if air leaks, the air leaking part is repaired and sealed in time, and the vacuum effect is prevented from being influenced. The connection of the vacuum pump system is checked one by one, and the vacuum degree on the pump can reach 96kPa under the condition of closing the gate valve, so that the vacuum pump system can be ensured to play the best effect.
In order to prevent the soil around the construction area from being instantaneously damaged by vacuum preloading, the vacuumizing speed is controlled at the beginning stage, half vacuum pumps are started first, and then the number of the vacuum pump working stations is gradually increased. When the vacuum degree reaches 60kPa, after checking no air leakage, the water storage on the membrane surface is started, and all pumps are started.
13) Vacuumizing and maintaining;
and the vacuum degree reaches 60kPa, and after no air leakage phenomenon is detected, a natural cofferdam formed by backfilling clay at the film pressing ditch is used for storing water to form a water film with the thickness not more than 60cm, and the water film is used as a supplementary load of vacuum preloading.
And (3) increasing the vacuum degree under the film to 80kPa, and keeping the constant load of the vacuum preloading area for 90 days to finish the consolidation of the silty titanium white tail slime 10.
For detecting the reinforcement effect after the vacuum preloading construction is accomplished, the increase condition of foundation bearing capacity is known, the field reinforcement effect detection needs to be carried out, and the detection project mainly has: a. indoor test analysis of drilling and soil sampling; b. carrying out an on-site cross plate shearing test; c. and (4) carrying out a plate loading test on site.
And the indoor test and the in-situ test are carried out after the vacuum preloading unloading is carried out for 3-5 d. The number of tests is not less than 6 per partition. The foundation bearing capacity checking quantity is detected according to each processing subarea, wherein the number of the foundation bearing capacity checking quantity is not less than 3 points.
And detecting the construction effect, wherein the shear strength of the titanium white mud cross plate is improved to more than 40kPa from 5kPa after the vacuum preloading treatment, and the bearing capacity of the site foundation and the 15kPa before the vacuum preloading are improved to 80 kPa.
In conclusion, the above embodiments are merely intended to illustrate the technical solution of the present invention and not to limit, although the present invention has been described by referring to certain preferred embodiments thereof, it should be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (8)
1. A vacuum preloading drainage consolidation method for silty titanium dioxide tailings is characterized by comprising the following steps:
1) partitioning the shoal surface of the titanium white tailing pond;
2) construction measurement;
measuring temporary control points of each subarea;
3) laying geotextile and geogrid;
laying a layer of 400g/m on the upper part of each subarea2The upper part of the geotextile is paved with a geogrid;
4) laying a sand cushion layer;
uniformly paving a sand cushion layer with the thickness of 0.5m on the geogrid;
5) arranging a plastic drainage plate;
a) using a total station and a steel ruler to punch a plate position on the drainage plate of each subarea, and using bamboo sticks or drainage plate cores and the like to insert a sand cushion layer for marking;
b) moving the plate inserting machine to position, and installing a drainage plate pile shoe;
c) inserting a drainage plate to the sand cushion layer; setting the perpendicularity deviation within +/-1.5%, wherein the length of each return belt is not more than 50 cm;
d) pulling the pile pipe upwards until the lower end of the pile pipe is 50cm higher than the sand cushion layer surface;
e) cutting the drain board to ensure that the length of the drain pipe extending out of the sand cushion layer is not less than 20 cm;
f) the machine is moved to carry out the construction of the next drainage plate;
g) after the construction of each partition plastic drainage plate is completed, the holes formed when the drainage plate is arranged are backfilled by sand, and the plate head of the drainage plate is embedded in the sand cushion;
6) arranging a clay sealing wall;
separating the construction area and the non-construction area of each subarea by using a clay sealing wall to ensure that the construction area is in a closed state;
7) laying a filter pipe;
laying filter pipes in each partition, wherein the transverse spacing of the filter pipes is 4m, the longitudinal spacing of the filter pipes is 20m, and the filter pipes are connected through a tee joint or a four-way joint;
8) leveling the field;
after laying the filter pipes, burying the exposed plastic drainage plate below the sand surface, and filling the holes formed when the plastic drainage plate is inserted;
9) excavating a film pressing ditch;
excavating a film pressing ditch at the boundary of each subarea;
10) laying geotextile and sealing film;
laying non-woven geotextile on a flat field, and then laying a sealing film, wherein the periphery of the sealing film is arranged in the film pressing ditch;
11) connecting vacuum-pumping equipment;
horizontally installing a vacuum pump in the construction area of each subarea;
12) vacuum preloading and air exhaust;
checking and repairing air leakage;
13) vacuumizing and maintaining;
and (5) carrying for 90 days in the vacuum preloading area to finish the consolidation of the silty titanium dioxide tailings.
2. The method for vacuum preloading drainage consolidation of silt titanium white tailings of claim 1, wherein the area of each partition is 2000m2。
3. The vacuum preloading drainage consolidation method for the silty titanium white tailings according to claim 1, wherein the plastic drainage plates are C-shaped plates with a spacing of 1m and are arranged in a regular triangle or quincunx shape; the length of the plastic drainage plate embedded in the sand cushion layer is not less than 0.3 m.
4. The vacuum preloading drainage consolidation method for the silty titanium white tailings according to claim 1, wherein the insertion depth of the sealing wall is not less than 1.0m, the wall thickness of the sealing wall is not less than 1.2m, the clay content of the soil is more than 15%, and the permeability coefficient is less than 1 × 10-5cm/s。
5. The vacuum preloading drainage consolidation method for the silty titanium white tailings according to claim 1, wherein a plurality of small holes are arranged on the wall of the filter tube, the interval between the small holes is 5cm, the diameter of each small hole is 8-10 mm, and the small holes are arranged in a quincunx shape or a square shape.
6. The vacuum preloading drainage consolidation method for the titanium dioxide tailings with silty quality as claimed in claim 5, wherein the surface of the filter tube is wrapped with filter cloth, and the filter cloth is 150g/m2And (5) needling the filament into the geotextile.
7. The vacuum preloading drainage consolidation method for the silty titanium white tailings according to claim 1, wherein the excavation depth of the film pressing trench is not less than 1.0m, the side slope of the film pressing trench is smooth and has no sharp object, and the slope is 1: 1.
8. The vacuum preloading drainage consolidation method for the titanium dioxide tailings in the silty state as claimed in claim 1, wherein the sealing film is formed by two layers, and the thickness of each layer is 0.12-0.16 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113896387A (en) * | 2021-11-03 | 2022-01-07 | 南京工业职业技术大学 | Sludge purification and dehydration structure based on combination of thermal desorption technology and vacuum preloading technology and construction method thereof |
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