Shield muck comprehensive treatment system and method in complex geological environment

Abstract

The invention discloses a comprehensive treatment system and method for shield muck in a complex geological environment. The problem that in the prior art, the shield muck treatment efficiency is low in the complex geological environment is solved. The method mainly comprises the steps that S1, the shield muck is pumped into a mud-water separation system for muck and mud separation; s2, setting the specific gravity separation value of muck-containing particles to be 2.70 KG / m, after the slurry enters a slurry making system, conveying the slurry with the specific gravity of muck-containing particles smaller than 2.70 KG / m to a shield tunneling machine for tunneling circulation, and conveying the slurry with the specific gravity of muck-containing particles larger than 2.70 KG / m to a filter pressing system for filter pressing dehydration or conveying and filling the slurry into a geotextile tube bag for curing dehydration; and S3, sand washing and recycling are conducted on muck generated by the mud-water separation system, the filter pressing system and the geotextile pipe bag. According to the method, the slurry and the muck in the shield muck can be efficiently separated by combining methods of mud-water separation, filter pressing dehydration, geotextile tube bag solidification dehydration and the like, and the separated slurry and the separated muck are respectively recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a system and method for comprehensive treatment of shield slag in a complex geological environment. Background Art

[0002] With the advancement of national science and technology and the vigorous development of urban construction, the demand for tunnel construction is increasing, and the popularity of shield method in tunnel construction is also increasing.

[0003] During the underground construction process, the shield machine needs to cut the soil layer to advance, which will generate a large amount of debris and mud. The cut debris and mud are transported to the ground mud treatment station through the mud conveying pipeline for treatment; but since the ground mud treatment station can only accommodate a limited amount of debris and mud, the mud treatment station needs to have a high mud treatment efficiency. If the mud is not treated in time, it will affect the progress of the shield construction and delay the construction period.

[0004] In strata with more complex geological conditions, such as a complex stratum containing medium-coarse sand, clay, silty clay, gravel-containing silty clay, and limestone, the slag produced by shield tunneling is mainly sand, clay blocks, gravel, crushed stone, and limestone. The composition of the slag is complex, which makes mud treatment more difficult. The existing slag treatment methods have low operating efficiency and are time-consuming when treating slag with such complex composition. Therefore, when faced with strata with complex geology, a more efficient slag treatment method is urgently needed to solve the above problems.

[0005] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0006] In view of at least one of the above technical problems, the present disclosure provides a comprehensive treatment method for shield slag under complex geological environments. By combining methods such as mud-water separation, filter press dehydration, and geotube bag solidification dehydration, the slurry and slag in the shield slag can be efficiently separated, and the separated slurry and slag can be recycled separately, solving the problem of low efficiency of shield slag treatment under complex geological environments in the prior art.

[0007] According to one aspect of the present disclosure, a shield machine slag comprehensive treatment system under complex geological environment is provided, including a mud-water separation system correspondingly connected to the mud-water delivery pipeline of the shield machine, a pulping system connected to the downstream of the mud-water separation system, a filter press system correspondingly connected to the pulping system and a geotube bag; The mud-water separation system comprises a clay block-mud separator, a coarse screen separator, a first slurry storage tank, a first mud pump, a primary cyclone, a primary screening machine, a second slurry storage tank, a second mud pump, a secondary cyclone, and a secondary screening machine connected in sequence; the mud-water separation system also comprises a programmable controller; the programmable controller is correspondingly connected to the first mud pump, the second mud pump, the coarse screen separator, the primary screening machine, and the secondary screening machine, and the programmable controller can automatically open and close the first mud pump, the second mud pump, the coarse screen separator, the primary screening machine, and the secondary screening machine according to the shield slag flow received by the mud-water separation system; The filter press system comprises a feed tank, a feed pump, a filter press, a high-pressure blower, and a filtrate tank; the filter press comprises a filter chamber with a filter plate arranged inside.

[0008] According to another aspect of the present disclosure, a shield slag comprehensive treatment method is provided, which is implemented based on the shield slag comprehensive treatment system under the complex geological environment, and includes the following steps: S1: Pump the shield muck into the mud-water separation system to separate the muck and mud; S2: Set the separation value of the specific gravity of the slag particles to 2.70KG / m³. After the mud separated by the mud-water separation system enters the slurry making system, the mud with a specific gravity of less than 2.70KG / m³ is transported to the shield machine for excavation circulation, and the mud with a specific gravity of more than 2.70KG / m³ is transported to the filter press system for filter pressing and dehydration or transported and filled into the geotube bag for solidification and dehydration. S3: The slag that has passed through the mud-water separation system and the slag produced by the filter press system or geotube bag are washed and recycled.

[0009] In some embodiments of the present disclosure, in step S1, the separation process of the slag and mud includes: S11: pumping shield slag into the clay block-mud separator for slag-mud separation, conveying the separated mud to the coarse screening separator for first-stage slag-mud screening, and conveying the screened mud to the first slurry storage tank; S12: Pumping the mud in the first slurry storage tank into the first-stage cyclone through the first slurry pump, correspondingly transporting the mud containing the slag with a particle size of not less than 0.074 mm to the first-stage screening machine for second-stage slag-mud screening, and transporting the mud containing the slag with a particle size of less than 0.074 mm to the second slurry storage tank; and re-injecting the mud screened by the first-stage screening machine into the first slurry storage tank; S13: The mud in the second slurry storage tank is pumped into the secondary cyclone through the second mud pump, and the mud containing slag with a particle size of not less than 0.02 mm is transported to the secondary screening machine for third-stage slag-mud screening, and the mud containing slag with a particle size less than 0.02 mm is transported to the pulping system; and the mud screened by the secondary screening machine is re-injected into the second slurry storage tank.

[0010] In some embodiments of the present disclosure, in the steps S11, S12, and S13, the slag separated by the clay block-mud separator, the coarse screening separator, the primary screening machine, and the secondary screening machine are transported to the slag yard accordingly.

[0011] In some embodiments of the present disclosure, in step S2, the slurry filter pressing and dehydration includes: S21: injecting mud containing soil particles with a specific gravity greater than 2.70 kg / m³ into the feed tank, pumping the mud in the feed tank into the filter chamber through the feed pump, and continuously pumping mud into the filter chamber to maintain the filtration pressure in the filter chamber, so that the water in the mud flows out of the filter chamber through the filter plate; S22: The high-pressure blower blows the filter plate to squeeze the remaining mud in the filter chamber for dehydration; the water discharged from the filter chamber is injected into the filtrate pool.

[0012] In some embodiments of the present disclosure, in step S2, during the mud solidification and dehydration process, a flocculating agent is added to the mud containing slag particles with a specific gravity greater than 2.70 KG / m³ and stirred, and then the mud is pumped into a geotube bag for solidification and dehydration.

[0013] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages: 1. Combine mud-water separation, filter press dehydration and geotube solidification dehydration methods. Shield slag can be separated from slag and mud through the mud-water separation system. The treated mud with slag particles greater than 2.70KG / m³ can be separated from fine sand and water in time through the filter press system or geotube. The shield slag treatment in complex geological environments is timely and efficient.

[0014] 2. The slag produced in the process of treating shield slag in the mud-water separation system, filter press system and geotube bag can be recycled as building materials after secondary sand washing. The mud and filtered water produced can be used for the shield slurry system, slurry preparation and other construction water. The construction is green and environmentally friendly and conducive to sustainable development.

[0015] 3. The mud-water separation system is equipped with a programmable controller connected to each important device in the mud-water separation system. It can display the equipment operation status in real time and automatically control the switch. It can also summarize the on-site conditions and information to the information center for collection and organization, which is convenient for technical personnel to analyze data and formulate corresponding solutions according to the corresponding situation, thus providing guarantee for the smooth construction of the mud-water shield.

[0016] 4. Geotube bags can be stacked layer by layer and the internal moisture can be filtered out by their own gravity. No large-scale machinery and equipment are required, which can avoid the construction safety problems existing in the production process of large-scale machinery and equipment, and the production cost is low. In addition, since the construction site of geotube bag curing and dehydration is large, the geotube bags are adequately laid and divided into areas, the mud can be continuously filled into the geotube bags for curing and dehydration treatment. After the solidified slag meets the requirements of vehicle transportation, the slag is discharged in time by the slag discharger, so as to achieve uninterrupted production of geotube bags and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a mud-water separation system in one embodiment of the present application.

[0018] Figure 2 Schematic diagram of a filter press system in one embodiment of the present application.

[0019] Figure 3 This is a field construction drawing of geotube solidification and dehydration in one embodiment of the present application.

[0020] In the above figures, 1 is a clay block-mud separator, 2 is a coarse screening separator, 3 is a first slurry storage tank, 4 is a first mud pump, 5 is a primary cyclone, 6 is a primary screening machine, 7 is a second slurry storage tank, 8 is a second mud pump, 9 is a secondary cyclone, 10 is a secondary screening machine, 11 is a pulping system, 12 is a slag yard, 13 is a feed tank, 14 is a feed pump, 15 is a filter press, and 16 is a filtrate tank. DETAILED DESCRIPTION

[0021] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", "horizontal", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second", etc. involved in the present application are used to distinguish the objects described and do not have any order or technical meaning. The terms "connection" and "connection" involved in the present application, unless otherwise specified, include direct and indirect connections (connections).

[0023] Unless otherwise specified, the components, structures, mechanisms, sensors and other devices involved in the following embodiments are conventional commercially available products.

[0024] The embodiments of the present application provide a comprehensive shield slag treatment system and method under complex geological environments, thereby solving the problem of low slag treatment efficiency in the prior art when facing complex geology. Various slag materials can be efficiently treated through mud-water separation, filter press dehydration, geotube solidification dehydration, sand and gravel recovery and other steps to ensure normal shield construction.

[0025] Embodiment 1 This example discloses a shield slag comprehensive treatment system under complex geological conditions. Figures 1 to 3 , including a mud-water separation system connected to the mud-water conveying pipeline of the shield machine, a pulping system connected to the downstream of the mud-water separation system, a filter press system connected to the pulping system and a geotube bag.

[0026] See also Figure 1The shield slag is separated from the water by a mud separation system, and the mud separation system includes a clay block-mud separator 1, a coarse screening separator 2, a first slurry storage tank 3, a first mud pump 4, a primary cyclone 5, a primary screening machine 6, a second slurry storage tank 7, a second mud pump 8, a secondary cyclone 9, and a secondary screening machine 10 connected in sequence; the inlet end of the clay block-mud separator is correspondingly connected to the shield slag conveying pipeline, and its outlet end includes a first slag outlet end and a first mud outlet end, and the first mud outlet end is correspondingly connected to the inlet end of the coarse screening separator; the outlet end of the coarse screening separator includes a second slag outlet end and a second mud outlet end, and the second mud outlet end is correspondingly connected to the first slurry storage tank; the inlet end of the primary cyclone is connected to the outlet end of the first slurry storage tank through the first mud pump, The outlet end of the first-stage cyclone includes a third slag outlet end and a third mud outlet end, and the third slag outlet end is correspondingly connected to the inlet end of the first-stage screening machine. The outlet end of the first-stage screening machine includes a fourth slag outlet end and a fourth mud outlet end, and the fourth mud outlet end is correspondingly connected to the first slurry storage tank; the third mud outlet end is correspondingly connected to the second slurry storage tank, and the inlet end of the second-stage cyclone is correspondingly connected to the outlet end of the second slurry storage tank through the second mud pump. The outlet end of the second-stage cyclone includes a fifth slag outlet end and a fifth mud outlet end, and the fifth slag outlet end is correspondingly connected to the inlet end of the second-stage screening machine. The outlet end of the second-stage screening machine includes a sixth slag outlet end and a sixth mud outlet end, and the sixth mud outlet end is correspondingly connected to the second slurry storage tank; the fifth mud outlet end is correspondingly connected to the slurry making system.

[0027] The mud and water separation system also includes two programmable controllers, each of which can control nine motors, including the motors of the water seal pump, the first mud pump, the second mud pump, the coarse screening separator, the first-level screening machine, and the second-level screening machine. The screening machine includes two motors; the port of the programmable controller is connected to the human-machine interface communication port, and the operating status of each drive motor can be displayed through the human-machine interface and indicator lights; the operating current of each motor is detected through 9 analog inputs and displayed through the human-machine interface in various places; when operating online, the programmable controller can automatically control the opening and closing of the motors in each link according to the slag flow received by the mud and water separation system, thereby realizing efficient mud and water separation.

[0028] The programmable controller is connected with the human-machine interface, which can intelligently display the current, voltage, frequency, flow and other states of the main components of the mud-water separation system, and display the formation conditions and the slag discharge conditions of the corresponding formation equipment. The on-site conditions and information are summarized to the information center for collection and sorting. At the same time, the data of the information center will be promptly reflected to the manufacturer's technical center. The technical center is equipped with experts to conduct data analysis and diagnosis, give corresponding solutions in time, and prompt manual intervention, providing a solid guarantee for the smooth construction of the slurry shield.

[0029] The filter press system comprises a feed tank, a feed pump, a filter press, a high-pressure blower and a filtrate tank which are connected in sequence; the filter press comprises a filter chamber with a filter plate arranged inside.

[0030] Embodiment 2 This example discloses a comprehensive treatment method for shield slag in complex geological environments. Figures 1 to 3 ,include: Step 1: Separation of slag and mud: S1, the clay block-mud separator 1 receives the shield slag from the shield machine and performs slag-mud separation. The separated slag is discharged to the slag yard 12 through the first slag outlet end, the moisture content of the separated slag is ≤30%, and the slag particle size is ≥20mm. The separated mud with a particle size less than 20mm enters the coarse screening separator 2 through the first mud outlet end; after screening by the coarse screening separator 2, the slag with a particle size ≥4mm is discharged to the slag yard 12 through the second slag outlet end, and the moisture content of the slag is ≤30%. The separated mud with a particle size less than 4mm enters the first slurry storage tank 3.

[0031] S2, the first mud pump 4 pumps the mud from the bottom of the first slurry storage tank 3 to the first-level cyclone 5 for cyclone separation, and the mud with a particle size ≥0.074mm enters the first-level screening machine 6 through the third slag outlet end for screening and dehydration. The slag particle size after dehydration is ≥0.074mm and the moisture content is ≤30%, and enters the slag yard 12 through the fourth slag outlet end, while the mud with a particle size less than 0.074mm in the first-level screening machine 6 re-enters the first slurry storage tank 3 through the fourth mud outlet end; the mud with a particle size less than 0.074mm in the first-level cyclone 5 enters the second slurry storage tank 7 through the third mud outlet end.

[0032] S3, the second mud pump 8 pumps the mud from the bottom of the second slurry storage tank 7 to the secondary cyclone 9 for cyclone separation, and the mud with a particle size ≥ 0.02 mm enters the secondary screening machine 10 through the fifth slag outlet port for screening and dehydration. The slag particle size after dehydration is ≥ 0.02 mm and the moisture content is ≤ 30%, and enters the slag yard 12 through the sixth slag outlet port, while the mud with a particle size less than 0.02 mm in the secondary screening machine 10 re-enters the second slurry storage tank 7 through the sixth mud outlet port; the mud with a particle size less than 0.02 mm in the secondary cyclone 9 enters the pulping system 11 through the fifth mud outlet port to complete the mud-water separation.

[0033] The shield slag is processed by the mud-water separation system and pumped into the pulping system. In the pulping system, the fine particles in the mud continue to increase, resulting in a continuous increase in the proportion of slag particles in the mud. When the proportion of slag particles in the mud exceeds 2.70KG / m³, it cannot meet the pulping requirements. At this time, the mud with a proportion of slag particles exceeding 2.70KG / m³ is dehydrated; in complex geological environments, the filter press system cannot fully meet the mud treatment requirements with a proportion of slag particles exceeding 2.70KG / m³, and it needs to be discharged into geotube bags for synchronous treatment.

[0034] Step 2: Mud filter press dehydration: See also Figure 2 The mud in the pulping system with a specific gravity of soil particles exceeding 2.70KG / m³ is transported to the feed pool 13 of the filter press system, and the mud in the feed pool 13 is pumped to the filter press for treatment through the feed pump 14; the filter press is provided with a filter chamber with a filter plate inside, and the feed pump 14 injects the mud into the filter chamber, and after the filter chamber is filled, the mud is continuously pumped into the filter chamber to exert pressure on the mud in the filter chamber, so that the water in the mud passes through the filter plate and flows out of the filter chamber; after a certain amount of mud is injected, the mud pumping is stopped, and the filter plate is actuated by a high-pressure blower to squeeze the remaining mud in the filter chamber for dehydration treatment, and the remaining mud in the filter chamber forms a filter cake, and then high-pressure air is uniformly passed through the cross-section of the filter cake to continue to replace the residual water in the filter cake until the water content of the filter cake is less than 30%, which is suitable for vehicle transportation; the filtrate water discharged from the filter chamber is stored in the filtrate pool 16, which can be used in the internal circulation system of the pulping system to achieve recycling.

[0035] The filter press takes 40 to 50 minutes per cycle to process fine sand layers, and 10 to 20 minutes per cycle to process sand layers. It can process about 11 to 13.5 m³ of mud cake per hour. Considering the integrity rate of on-site equipment and the process connection time, the total amount of mud cake processed per day is 220 to 270 m³.

[0036] Step 3: Curing and dehydration of geotube bags: See also Figure 3 , adjust the concentration and screen the garbage for the mud with the specific gravity of the slag particles exceeding 2.70KG / m³ in the pulping system, transport the mud to the dosing and mixing area through the pumping system, add the prepared flocculant in a certain proportion to the main pipeline for mud transportation through the dosing device, and use the dynamic mixing device to mix and stir the flocculant and the mud; then inject the stirred mud into the geotube bag with high strength and filterability through the pumping system, and the mud will be fully flocculated in the geotube bag to achieve rapid separation of mud and water; utilize the soil retention and drainage properties of the geotube bag, through the gravity of the mud itself, the tension of the geotube bag wall and the pressure inside the geotube bag during the injection process, so that the water in the mud is quickly discharged from the geotube bag, while the solid particles in the mud are retained, so as to achieve mud dehydration and solidification.

[0037] Geotube dewatering technology can reasonably customize the tube bag size and material parameters according to site conditions, mud concentration, soil particle grading characteristics and volume. It is not only convenient to construct, but also can be constructed in large quantities on multiple work surfaces. It has no secondary pollution, is clean and environmentally friendly, and the filtered water and consolidated soil can be utilized as resources.

[0038] The geotube bag curing and dehydration process uses environmentally friendly treatment agents in production. The filtrate from the bag is clear and transparent and can be used for construction water or directly discharged. After the bags are stacked layer by layer, the moisture content can reach less than 50% in a short period of time, meeting the conditions for transporting the soil out. The process does not require large-scale machinery and equipment, and almost no large-scale equipment operation safety issues are involved in production, avoiding safety issues that may arise during the production process. The process consumes less electricity in construction, with a single set of equipment consuming about 120 kilowatts, which reduces a certain amount of pressure on project electricity consumption compared to mechanical filter presses, and has low construction costs. The geotube bag curing and dehydration can be constructed continuously, with uninterrupted production from the mud pool to the bag dehydration. A single set of equipment can produce up to 3,000 m³ of mud per day, with high construction efficiency.

[0039] Step 4: Sand and gravel recycling: The slag produced by the mud-water separation system, filter press system and geotube bag is cleaned twice by the sand washing machine. After testing to meet the standards, it can be recycled as building materials. The spiral sand washing machine or wheel sand washing machine each constitutes a set of equipment. Through multi-stage washing and screening, the loss of fine-grained sand and stone powder is less, the output sand has a better gradation, the modulus is easy to control, and the quality is relatively stable.

[0040] Although some preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0041] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A shield slag comprehensive treatment system under complex geological environment, characterized in that: It includes a mud-water separation system correspondingly connected to the mud-water conveying pipeline of the shield machine, a pulping system connected to the downstream of the mud-water separation system, a filter press system correspondingly connected to the pulping system and a geotube bag; The mud-water separation system comprises a clay block-mud separator, a coarse screen separator, a first slurry storage tank, a first mud pump, a primary cyclone, a primary screening machine, a second slurry storage tank, a second mud pump, a secondary cyclone, and a secondary screening machine connected in sequence; the mud-water separation system also comprises a programmable controller; the programmable controller is correspondingly connected to the first mud pump, the second mud pump, the coarse screen separator, the primary screening machine, and the secondary screening machine, and the programmable controller can automatically open and close the first mud pump, the second mud pump, the coarse screen separator, the primary screening machine, and the secondary screening machine according to the shield slag flow received by the mud-water separation system; The filter press system comprises a feed tank, a feed pump, a filter press, a high-pressure blower, and a filtrate tank; the filter press comprises a filter chamber with a filter plate arranged inside.

2. A comprehensive treatment method for shield slag, characterized in that: The shield slag comprehensive treatment system under complex geological environment described in claim 1 is implemented, including the following steps: S1: Pump the shield muck into the mud-water separation system to separate the muck and mud; S2: Set the separation value of the specific gravity of the slag particles to 2.70KG / m³. After the mud separated by the mud-water separation system enters the slurry making system, the mud with a specific gravity of less than 2.70KG / m³ is transported to the shield machine for excavation circulation, and the mud with a specific gravity of more than 2.70KG / m³ is transported to the filter press system for filter pressing and dehydration or transported and filled into the geotube bag for solidification and dehydration. S3: The slag that has passed through the mud-water separation system and the slag produced by the filter press system or geotube bag are washed and recycled.

3. The shield slag comprehensive treatment method according to claim 2 is characterized in that: In step S1, the separation process of the slag and mud includes: S11: pumping shield slag into the clay block-mud separator for slag-mud separation, conveying the separated mud to the coarse screening separator for first-stage slag-mud screening, and conveying the screened mud to the first slurry storage tank; S12: Pumping the mud in the first slurry storage tank into the first-stage cyclone through the first slurry pump, correspondingly transporting the mud containing the slag with a particle size of not less than 0.074 mm to the first-stage screening machine for second-stage slag-mud screening, and transporting the mud containing the slag with a particle size of less than 0.074 mm to the second slurry storage tank; and re-injecting the mud screened by the first-stage screening machine into the first slurry storage tank; S13: The mud in the second slurry storage tank is pumped into the secondary cyclone through the second mud pump, and the mud containing slag with a particle size of not less than 0.02 mm is transported to the secondary screening machine for third-stage slag-mud screening, and the mud containing slag with a particle size less than 0.02 mm is transported to the pulping system; and the mud screened by the secondary screening machine is re-injected into the second slurry storage tank.

4. The shield slag comprehensive treatment method according to claim 3 is characterized in that: In the steps S11, S12 and S13, the slag separated by the clay block-mud separator, the coarse screening separator, the primary screening machine and the secondary screening machine are transported to the slag yard accordingly.

5. The shield slag comprehensive treatment method according to claim 2 is characterized in that: In step S2, the slurry filter pressing and dehydration comprises: S21: injecting mud containing soil particles with a specific gravity greater than 2.70 kg / m³ into the feed tank, pumping the mud in the feed tank into the filter chamber through the feed pump, and continuously pumping mud into the filter chamber to maintain the filtration pressure in the filter chamber, so that the water in the mud flows out of the filter chamber through the filter plate; S22: The high-pressure blower blows the filter plate to squeeze the remaining mud in the filter chamber for dehydration; the water discharged from the filter chamber is injected into the filtrate pool.

6. The shield slag comprehensive treatment method according to claim 2 is characterized in that: In the step S2, during the mud solidification and dehydration process, a flocculating agent is added to the mud containing the slag particles with a specific gravity greater than 2.70 kg / m³ and stirred, and then the mud is pumped into the geotube bag for solidification and dehydration.

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