CN113279389A - Blow-fill sludge foundation treatment method for water vaporization caused by hydration heat release - Google Patents
Blow-fill sludge foundation treatment method for water vaporization caused by hydration heat release Download PDFInfo
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- CN113279389A CN113279389A CN202110702003.XA CN202110702003A CN113279389A CN 113279389 A CN113279389 A CN 113279389A CN 202110702003 A CN202110702003 A CN 202110702003A CN 113279389 A CN113279389 A CN 113279389A
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/16—Materials undergoing chemical reactions when used
- C09K5/18—Non-reversible chemical reactions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
Abstract
The invention provides a method for treating a hydraulic filling sludge foundation by hydration exothermic water vaporization, which comprises the following process flows of leveling the site around hydraulic filling sludge, paving a sand cushion layer, measuring lofting, laying heat exchange pipe hole sites, inserting and beating heat exchange pipes, filling dry powder of reaction exothermic materials, inserting and beating air-permeable fiber micro-pipes and synchronously injecting water into the heat exchange pipes; the invention achieves the purpose of hydraulic filling sludge drainage consolidation treatment based on a method that water in hydrated exothermic soil is vaporized and is discharged by upward migration through soil thermal expansion microcracks, and has the characteristics of rapidness, effectiveness, uniform treatment, economy and environmental protection.
Description
Technical Field
The invention belongs to the technical field of soft soil foundation treatment in geotechnical engineering, and particularly relates to a method for treating a hydraulic filling sludge foundation by converting (liquid) water in soil into water vapor to be discharged out of the foundation under the action of heat energy.
Background
With the continuous implementation of the 'ocean Enhance' strategy in China, the major and middle cities in coastal areas are rapidly developed, and the problem of land resource shortage occurs in the process of changing, expanding or building municipal administration, harbors and wharfs, which seriously restricts the sustainable development of the major and middle cities in coastal areas. At present, "reclamation of coastal waters and reclamation by reclamation" becomes an important technical means for relieving the problem of serious shortage of coastal urban land resources. Most of coastal areas of China utilize hydraulic fill sludge to expand land areas. The newly hydraulic filling sludge has high water content and poor engineering performance, and engineering construction can be carried out on the sludge after treatment.
The key of the foundation treatment of the hydraulic filling silt is to discharge water in soil. Currently, hydraulically filled sludges are treated by the drainage consolidation process (especially vacuum preloading). The vacuum preloading method can treat large-area soft soil foundation and the treatment effect is more uniform. However, the vacuum preloading method has the inherent defects of long working time, high energy consumption, insufficient deep vacuum pressure, easy clogging of the plastic drainage plate and the like, and the working efficiency of the vacuum preloading method is seriously reduced. In addition, the saturated soft soil foundation can also be treated by expansion compaction of the lime piles, water absorption reaction, heat release to vaporize water and composite foundation effect. However, lime piles are only suitable for saturated soft clay under ground water level, the water content of the soil needs to be strictly controlled, the pile body strength is relatively low, and alkaline substances (such as Ca (OH)) formed by hydration reaction are generated2) It is easy to make the soil salinized.
In order to accelerate the consolidation process of the hydraulic filling sludge, the invention develops a reasonable, efficient and economic new technology and new process for treating the hydraulic filling sludge foundation by adopting the heat exchange and phase state conversion principles of water vaporization and evaporation in the hydraulic filling sludge caused by hydration and heat release of substances, can quickly convert the hydraulic filling sludge from slurry in a flow-plastic state into a soil body in a hard-plastic state, and is suitable for similar engineering construction such as natural soft soil foundation treatment, hydraulic filling sludge foundation treatment, dredging sludge yard quick drying treatment and the like.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for treating a hydraulic filling silt foundation by hydration exothermic water vaporization, which can effectively solve the engineering problem of quick drainage and consolidation of the hydraulic filling silt foundation in a sea reclamation engineering.
The hydraulic filling silt foundation treatment construction of hydration and heat release water vaporization is executed according to a drainage consolidation method in soft soil foundation treatment. The construction process flow comprises the steps of leveling a site around the dredger fill sludge, paving a sand cushion, measuring and lofting, laying heat exchange pipe hole sites, inserting and beating heat exchange pipes, filling dry powder of a reaction heat release material, inserting and beating air-permeable fiber micro-pipes and heat exchange pipes, and injecting water synchronously. The key technology comprises exothermic reaction material preparation, heat exchange tubes, air-permeable fiber tubes and arrangement thereof, and related construction methods.
The technical scheme of the invention is as follows:
a method for treating a hydraulically filled sludge foundation by hydration, heat release and water vaporization, comprising the following steps:
(1) pretreatment before construction
Leveling the peripheral area of the hydraulic filling sludge to form an operation field, and then paving a sand cushion layer on the upper part of a sludge soil layer;
(2) inserting and beating heat exchange pipe
Measuring lofting cloth holes on the surface of the sand cushion layer, drilling holes by using a drilling machine, inserting and drilling heat exchange tubes, wherein the inserting and drilling sequence is that the middle is performed firstly, then the periphery is performed, and the inserting and drilling depth is below the bottom (0.2-1 m) of the hydraulic filling sludge layer;
the heat exchange tube has the wall thickness d of 2-5 mm and the inner diameter
The hot-rolled seamless steel pipe is made of stainless steel with excellent heat conduction performance, the bottom of the hot-rolled seamless steel pipe is closed, and 4 ear-shaped pull rings are symmetrically welded at the top of the hot-rolled seamless steel pipe, so that the hot-rolled seamless steel pipe can be conveniently pulled out and reused after being used;
according to the attenuation rule of the hydration temperature of the quicklime relative to the distance, on a horizontal plane, the distance between the pipes is less than or equal to 3-4 times of the inner diameter of the pipe (namely 0.75-1.20 m or 1.00-1.60 m);
the rectangular or quincunx heat exchange tubes are arranged, so that the temperature in the soil at the position farthest away from the tubes can be kept close to the boiling point of water, and the water in the soil can be vaporized and evaporated quickly and is discharged upwards to the ground surface most effectively;
(3) dry powder for filling reaction exothermic material
Before filling reaction heat release material dry powder, placing a grouting floral tube in the heat exchange tube, then placing the reaction heat release material dry powder in the heat exchange tube, filling the heat exchange tube in layers along the axial direction of a drill hole, wherein the thickness of each layer is 30-50 cm, and vibrating and compacting each layer after filling;
the grouting perforated pipe is a hot-rolled seamless steel pipe with the inner diameter d of 10-20 mm and the wall thickness t of 2-5 mm, and the pipe is made of a material with a certain thicknessPore diameter d of wall poreh＝2～5mm；
The hydrated heat-release material which is economic and efficient and is used for vaporizing water in the soil is quicklime (CaO); using quicklime as main raw material and (anhydrous) gypsum (CaSO)4) As an auxiliary material, a small amount of expansion inhibitor is added, and the reaction heat release material dry powder is prepared; the quicklime is mainly obtained from industrial lime (active calcium oxide should be more than 85%), or partially from blast furnace slag (main components are CaO and SiO)2、Al2O3) And industrial solid waste materials such as a discarded quicklime desiccant (the main component is CaO) and the like; the (anhydrous) gypsum is mainly obtained from waste building gypsum (board) (the main component is CaSO)4)；
In the preparation design of the reaction heat release material, the unique physicochemical properties of each component are fully exerted, the quicklime plays a main role (heat release and temperature rise for vaporizing water in soil), the (anhydrous) gypsum plays an auxiliary role, and the admixture inhibits hydration expansion to relieve the pressure of the pipe wall; in order to quickly vaporize and evaporate liquid water in soil around a pipe, the optimal composition of the reaction heat release material dry powder is researched and developed by taking the heat release and the temperature decay distance (the temperature of the soil contact surface (namely the nearest part to the pipe) of the pipe is more than or equal to 100 ℃, and the temperature of the middle point of the connecting line of two adjacent pipes (namely the farthest part to the pipe) is close to the boiling point of water) as evaluation indexes: 50-60 parts of industrial lime, 10-20 parts of blast furnace slag, 0-10 parts of regenerated gypsum, 0-10 parts of slag cement and 0-5 parts of an additional expansion inhibitor (the parts are all parts by mass); preferably 55-60 parts of industrial lime, 20 parts of blast furnace slag, 10 parts of regenerated gypsum, 5-10 parts of slag cement and 5 parts of an additional expansion inhibitor;
(4) inserted and beaten air-permeable fiber micro-tube
Providing a channel for discharging water vapor, inserting and punching a permeable fiber micro-pipe which is permeable up and down in the sand cushion layer, and requiring to penetrate through the sand cushion layer to be below the top surface of the underground water line (10 cm);
the air-permeable fiber micro-tube can be made of relatively thick wheat straws, reed rods or artificial fiber micro-tubes, and the diameter of the air-permeable fiber micro-tube is 20-40 mm;
on a horizontal plane, two adjacent heat exchange tubes are arranged at equal intervals (the tube diameter is not more than 4-5 times), and relatively dense grids are formed between the heat exchange tubes to form a water vapor discharge channel in soil;
before the quicklime reacts and releases heat, the air-permeable fiber micro-tube is filled with water; after the reaction, the water is vaporized, and the water in the tube is also vaporized, so that the water becomes a water vapor channel;
(5) synchronous water injection for heat exchange tube
Synchronously injecting water into the drilled holes of all the heat exchange tubes, hydrating the quicklime, and introducing dilute hydrochloric acid (with the concentration of 10 wt%) to dissolve Ca (OH)2Is CaCl2Pumping out the solution by a vacuum pump, finally pulling out the heat exchange tube, and filling broken stones to seal holes to finish the treatment of the dredger fill sludge foundation;
when water is synchronously injected, the water pressure is controlled to be 0.2-0.3 MPa, the flow rate is controlled to be 0.5-0.7L/s, water uniformly permeates dry powder around the grouting floral tube, the time difference of exothermic reaction of the dry powder in drill holes of different hole positions is reduced, soil bodies around the tube in the hydraulic filling silt foundation are simultaneously and uniformly heated, soil thermal expansion generates micro cracks, and water is vaporized and moves upwards to be discharged;
generally, the hydration time of the quicklime is about 4-6 h, the temperature around the pipe is quickly attenuated after the reaction is finished, and dilute hydrochloric acid is required to be introduced immediately after the quicklime is completely cured to dissolve Ca (OH)2Is CaCl2And pumping the solution out through a vacuum pump, filling dry powder of a reaction heat release material again after the materials in the pipe are emptied, injecting water for reaction, and repeating the process to discharge water in the blow-filled sludge in a steam form, so that the water content is reduced to a preset standard.
The basic principle of the invention is as follows:
inserting heat exchange tubes into the dredger fill silt foundation, wherein the inner diameter D of each tube is 250-400 mm, and the distance between the tubes is not more than 3-4 times of the inner diameter of each tube. Reaction heat release material dry powder is put into the pipe, and water is synchronously injected to generate hydration heat release reaction, so that the highest temperature of the pipe can reach 200-300 ℃ by the hydration heat release, and the temperature of surrounding soil is close to the boiling point of water. The water in the soil around the pipe can be quickly vaporized and evaporated and is discharged out of the ground surface. Therefore, the soil body around the pipe in the hydraulic fill silt foundation is heated simultaneously and uniformly, and the soil is thermally expanded to generate micro cracks; meanwhile, water in the soil is quickly vaporized and is moved upwards through micro cracks in the soil under the action of steam pressure. When the water vapor in the soil moves to reach the underground water level, the water vapor rises to the ground surface through the air-permeable fiber micro-tubes which are inserted and punched in advance, and then is discharged into the atmosphere. In summary, the basic principle of the invention is based on a method that water in hydrated exothermic soil is vaporized and is moved upwards through soil thermal expansion microcracks to be discharged, thereby achieving the purpose of hydraulic consolidation treatment of the hydraulic filling sludge.
The invention has the beneficial effects that:
1. the method is quick and effective: compared with a vacuum preloading method, the method reasonably arranges the heat exchange tubes in the hydraulic fill silt foundation, can quickly and effectively finish the discharge process of water in the foundation soil, and further achieves the aim of foundation reinforcement in a shorter construction period.
2. Uniformly treating: in the plane and depth direction, the invention has uniform vaporization and discharge effects on water in soil, thereby uniformly treating large-area dredger fill silt foundation; in the prior art, the vacuum preloading method reduces the treatment effect due to pressure attenuation under a certain depth, and the lime pile method reduces the treatment effect due to attenuation caused by increasing the horizontal distance and compacting action.
3. Economic and environment-friendly: the invention strengthens the engineering section required by the dredger fill sludge, and is more economical than the vacuum preloading method; chemical reaction product of the invention (Ca (OH)2) Can be recycled after being treated, and is more environment-friendly compared with a lime pile method.
Drawings
FIG. 1 is a sectional view of a heat exchange tube and an air-permeable fiber microtube of the present invention, wherein (1) -the heat exchange tube, (2) -the ear-shaped pull ring, (3) -the air-permeable fiber microtube, (4) -the sand cushion layer, (5) -the groundwater level, and (6) -the sludge layer.
FIG. 2 is a plan view of the heat exchange tube and the air-permeable fiber microtube of the present invention, wherein (1) -the heat exchange tube, (3) -the air-permeable fiber microtube, and (23) -the construction site.
FIG. 3 is a cross-sectional view of a heat exchange tube of the present invention wherein (2) -ear-shaped pull rings and (32) -tube wall of the heat exchange tube.
Detailed Description
The invention is further described below by means of specific examples, without the scope of protection of the invention being limited thereto.
In the following examples, the swelling inhibitor used was a hydraulic oil of great wall 46.
Example 1 airport foundation sludge layer drainage consolidation treatment
A silt soil layer with the thickness of 6m exists on the airport foundation of a certain coastal city, the underground water level is 1.5m below the ground, and the foundation needs to be subjected to drainage consolidation treatment. In this regard, the operation site was formed by leveling the peripheral region of the sludge, and then a sand mat layer having a thickness of 0.8m was laid on the upper portion of the sludge soil layer.
Because the thickness of the silt layer is relatively thin, only square holes are needed. A thread drilling machine with the opening diameter of 250mm is selected for construction, the depth of a hole is 7m, the hole penetrates through a sludge layer, and the distance between adjacent holes is 1 m. And placing the heat exchange tube in the hole, inserting and beating the heat exchange tube in the order of the middle and the periphery, wherein the verticality of the heat exchange tube is ensured as much as possible in the inserting and beating process.
The heat exchange tube is only required to be filled with the reaction exothermic material dry powder. Filling the drill holes in a layered manner along the axial direction of the drill hole, wherein the thickness of each layer is about 50cm, and each layer is compacted by vibration after filling; before filling dry powder, a grouting flower tube is arranged in the tube, the pipe is a hot-rolled seamless steel tube with the inner diameter d of 10mm and the wall thickness t of 2mm, and the aperture d of a small hole on the grouting tube h2 mm. Because the thickness of the silt soil layer is relatively thin, in order to control the hydration expansion rate of the dry powder, the dry powder comprises the following components in percentage by mass: 55% of industrial lime (the content of calcium oxide is more than 90%), 20% of blast furnace slag, 10% of regenerated gypsum, 10% of slag cement and 5% of an external expansion inhibitor. Wherein the additive is used for inhibiting hydration expansion and relieving the pressure of the pipe wall.
And after filling, sealing the hole by covering the opening with the prefabricated PVC cover.
The comparatively thick reed pole is selected for use to ventilative fiber pipe, and the pipe diameter is 20 mm. And (3) densely inserting and drilling up and down through air-permeable fiber micro-pipes in the sand cushion layer, wherein the air-permeable fiber micro-pipes penetrate through the sand cushion layer to about 10cm below the top surface of the underground water line. On the horizontal plane, two adjacent heat exchange tubes are arranged at equal intervals, and relatively dense grids are formed between the heat exchange tubes to form a water vapor discharge channel in soil.
And synchronously injecting water into all the drill holes, controlling the water pressure to be 0.2MPa and the flow to be 0.5L/s, so that the water can quickly and uniformly permeate into the expansion material dry powder around the injection steel pipe, and reducing the time difference of expansion reaction of the dry powder at different positions in the drill holes.
After the dry powder reaction is finished, dilute hydrochloric acid is introduced immediately to dissolve Ca (OH)2Is CaCl2And pumping the solution out by a vacuum pump, and finally, pulling out the heat exchange tube and filling broken stones into the hole sealing.
And (5) performing drainage consolidation on the silt soil layers in other areas according to the steps.
And after the drainage consolidation of all the silt soil layers is finished, leveling the sand cushion layer to finish the final process of silt foundation treatment.
Example 2 drainage consolidation treatment of wharf foundation sludge layer
The wharf of a certain coastal city needs to be expanded, a sludge soil layer with the thickness of 12m exists, the underground water level is 1m below the ground, and the foundation needs to be subjected to drainage consolidation treatment. In this regard, the operation site was formed by leveling the peripheral region of the sludge, and then a sand cushion layer having a thickness of 1.2m was laid on the upper portion of the sludge soil layer.
Because the thickness of the silt layer is relatively thick, quincunx cloth holes are adopted. A thread drilling machine with the hole diameter of 350mm is selected for construction, the hole depth is 14m and penetrates through a sludge layer, and the distance between adjacent holes is 1 m. And placing the heat exchange tube in the hole, inserting and beating the heat exchange tube in the order of the middle and the periphery, wherein the verticality of the heat exchange tube is ensured as much as possible in the inserting and beating process.
The heat exchange tube is only required to be filled with the reaction exothermic material dry powder. Filling the holes in a layered manner along the axial direction of the drill hole, wherein the thickness of each layer is about 30cm, and each layer is compacted by vibration after filling; before filling dry powder, a grouting flower tube is arranged in the tube, the pipe is a hot-rolled seamless steel tube with the inner diameter d being 20mm and the wall thickness t being 3mm, and the aperture d of a small hole on the grouting tube h3 mm. Because the thickness of the silt soil layer is relatively thick, in order to control the hydration expansion rate of the dry powder and have enough temperature, the dry powder comprises the following components in percentage by mass: 60% of industrial lime (the content of calcium oxide is more than 90%), 20% of blast furnace slag, 10% of regenerated gypsum, 5% of slag cement and 5% of an external expansion inhibitor. Wherein the additive is used for inhibiting hydration expansion and relieving the pressure of the pipe wall.
And after filling, sealing the hole by covering the opening with the prefabricated PVC cover.
The comparatively thick reed pole is selected for use to ventilative fiber pipe, and the pipe diameter is 40 mm. And (3) densely inserting and drilling up and down through air-permeable fiber micro-pipes in the sand cushion layer, wherein the air-permeable fiber micro-pipes penetrate through the sand cushion layer to about 10cm below the top surface of the underground water line. On the horizontal plane, two adjacent heat exchange tubes are arranged at equal intervals, and relatively dense grids are formed between the heat exchange tubes to form a water vapor discharge channel in soil.
And synchronously injecting water into all the drill holes, controlling the water pressure to be 0.3MPa and the flow to be 0.7L/s, so that the water can quickly and uniformly permeate into the expansion material dry powder around the injection steel pipe, and reducing the time difference of expansion reaction of the dry powder at different positions in the drill holes.
After the dry powder reaction is finished, dilute hydrochloric acid is introduced immediately to dissolve Ca (OH)2Is CaCl2And pumping the solution out by a vacuum pump, and finally, pulling out the heat exchange tube and filling broken stones into the hole sealing.
And (5) performing drainage consolidation on the silt soil layers in other areas according to the steps.
And after the drainage consolidation of all the silt soil layers is finished, leveling the sand cushion layer to finish the final process of silt foundation treatment.
Claims (8)
1. A hydraulic filling sludge foundation treatment method for hydration heat release water vaporization is characterized by comprising the following steps:
(1) pretreatment before construction
Leveling the peripheral area of the hydraulic filling sludge to form an operation field, and then paving a sand cushion layer on the upper part of a sludge soil layer;
(2) inserting and beating heat exchange pipe
Measuring lofting cloth holes on the surface of the sand cushion layer, drilling holes by using a drilling machine, inserting and drilling heat exchange tubes, wherein the inserting and drilling sequence is that the middle is performed firstly, then the periphery is performed, and the inserting and drilling depth is below the bottom of the hydraulic filling sludge layer;
(3) dry powder for filling reaction exothermic material
Before filling reaction heat release material dry powder, placing a grouting floral tube in the heat exchange tube, then placing the reaction heat release material dry powder in the heat exchange tube, filling the heat exchange tube in layers along the axial direction of a drill hole, wherein the thickness of each layer is 30-50 cm, and vibrating and compacting each layer after filling;
the composition of the reaction exothermic material dry powder is as follows: 50-60 parts of industrial lime, 10-20 parts of blast furnace slag, 0-10 parts of regenerated gypsum, 0-10 parts of slag cement and 0-5 parts of an additional expansion inhibitor;
(4) inserted and beaten air-permeable fiber micro-tube
A channel is provided for the discharge of water vapor, and an up-and-down through air-permeable fiber micro-pipe is inserted into the sand cushion layer and is required to penetrate through the sand cushion layer to be below the top surface of the underground water line;
(5) synchronous water injection for heat exchange tube
Synchronously injecting water into the drilled holes of all the heat exchange tubes, hydrating the quicklime, introducing dilute hydrochloric acid to dissolve Ca (OH)2Is CaCl2And pumping the solution out through a vacuum pump, finally pulling out the heat exchange tube, and filling broken stones into the hole sealing to finish the treatment of the dredger fill sludge foundation.
2. The method for treating a dredger fill sludge foundation by hydrating heat to release heat and vaporize water according to claim 1, wherein in the step (2), the heat exchange tubes are inserted and punched to a depth of 0.2-1 m below the bottom of the dredger fill sludge layer.
3. The method for treating the foundation of hydraulic filling sludge through hydration, heat release and water vaporization according to claim 1, wherein in the step (2), the heat exchange tubes have the wall thickness d of 2-5 mm and the inner diameter
The hot-rolled seamless steel pipe is made of stainless steel, the bottom of the hot-rolled seamless steel pipe is closed, and 4 ear-shaped pull rings are symmetrically welded at the top of the hot-rolled seamless steel pipe; on a horizontal plane, the distance between the pipes is less than or equal to 3-4 times of the inner diameter of the pipe; the heat exchange tubes are arranged in a rectangular or quincunx shape.
4. The method for treating the foundation filled with the hydraulic filling sludge through hydration, heat release and water vaporization according to claim 1, wherein in the step (3), the inner diameter d of the grouting floral tube is 10-20 ═mm, wall thickness t 2-5 mm hot-rolled seamless steel pipe, pipe wall aperture dh＝2～5mm。
5. The method for treating a dredger-filled sludge foundation by hydrating exothermic water vaporization according to claim 1, wherein in the step (3), the composition of the reaction exothermic material dry powder is as follows: 55-60 parts of industrial lime, 20 parts of blast furnace slag, 10 parts of regenerated gypsum, 5-10 parts of slag cement and 5 parts of an additional expansion inhibitor.
6. The method for treating a dredger fill sludge foundation by hydrating heat-evolution-induced water vaporization according to claim 1, wherein in the step (4), the air-permeable fiber micro-pipes penetrate through the sand bed layer to a position 10cm below the top surface of the groundwater level line.
7. The method for treating the foundation of hydraulic filling sludge through hydration, heat release and water vaporization according to claim 1, wherein in the step (4), the air-permeable fiber micro-tubes are wheat straws, reed rods or artificial fiber micro-tubes, and the tube diameter is 20-40 mm; two adjacent heat exchange tubes are arranged on a horizontal plane at equal intervals with the tube diameter not more than 4-5 times.
8. The method for treating a foundation by hydraulic filling with sludge through hydration, heat release and water vaporization according to claim 1, wherein in the step (5), the water pressure is controlled to be 0.2-0.3 MPa and the flow rate is controlled to be 0.5-0.7L/s during synchronous water injection.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5027648B1 (en) * | 1969-04-18 | 1975-09-09 | ||
| CN101220590A (en) * | 2008-01-04 | 2008-07-16 | 东南大学 | Sullage solidifying method |
| TW201144531A (en) * | 2010-06-03 | 2011-12-16 | Shanghai Harbour Soft Soil Treatmant Engineering Group Co Ltd | Soft foundation treatment method |
| KR101290411B1 (en) * | 2012-04-27 | 2013-07-26 | 주식회사 동아지질 | Method of separating air and water and its apparatus for suction drain method |
-
2021
- 2021-06-24 CN CN202110702003.XA patent/CN113279389B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5027648B1 (en) * | 1969-04-18 | 1975-09-09 | ||
| CN101220590A (en) * | 2008-01-04 | 2008-07-16 | 东南大学 | Sullage solidifying method |
| TW201144531A (en) * | 2010-06-03 | 2011-12-16 | Shanghai Harbour Soft Soil Treatmant Engineering Group Co Ltd | Soft foundation treatment method |
| KR101290411B1 (en) * | 2012-04-27 | 2013-07-26 | 주식회사 동아지질 | Method of separating air and water and its apparatus for suction drain method |
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