Muck utilization system of double-mode shield tunneling machine under compound stratum muddy water and using method of muck utilization system

Abstract

The invention discloses a muck utilization system of a dual-mode shield tunneling machine under compound stratum muddy water and a using method of the muck utilization system, and relates to the technical field of shield construction. The muck utilization system of the dual-mode shield tunneling machine under the compound stratum muddy water comprises a shield tunneling machine 1, a muddy water separation system, a shield slurry mixing system, a filter pressing system, a thick slurry preparation system, a muck cleaning system and a thick slurry injection system. Through cooperation of all the systems, waste muck generated by shield tunneling can be treated and recycled, treated products can be applied to shield tunneling construction, the problem of discarding and transportation of the waste muck is solved, the construction cost is saved, the outsourcing cost of construction raw materials is reduced, the green construction concept is implemented, and the economic benefit is improved. The land occupation of outward transportation of muck is reduced, and good economic benefits and social benefits are achieved.

Description

Technical Field

[0001] This application relates to the field of tunnel boring machine (TBM) construction technology, and in particular to a system for utilizing excavated soil from a dual-mode TBM in composite strata and its application method. Background Technology

[0002] In tunnel and underground engineering construction, shield tunneling machines capable of multi-mode conversion are typically used to address the complex and variable geological conditions of composite strata. During shield tunneling, a large amount of waste soil is generated, and the methods and states of waste soil discharge vary significantly depending on the mode. Currently, the main methods for handling shield tunneling waste soil are direct off-site disposal or landfill.

[0003] To address the challenges of complex geological formations, including soft rock, hard rock, weak and uneven strata, and soft upper layers with hard lower layers, tunnel boring machines (TBMs) are increasingly versatile. Dual-mode TBMs (slurry + TBM) simultaneously operate in slurry mode, TBM mode, pneumatic-assisted tunneling mode within the slurry mode, and pressurized TBM tunneling mode. Within the same section, the TBM will switch modes multiple times based on changing geological conditions. During pneumatic-assisted tunneling, TBM mode tunneling, or pressurized TBM tunneling, a thick grout with self-stabilizing and water-resistant properties is typically injected into the radial injection holes of the TBM shield. This grout forms a stable buffer layer between the shield and the strata, preventing grout from flowing forward and water from flowing backward during construction, thus sealing the soil chamber and providing shock absorption. High-concentration slurry and fine sand particles are among the components of this thick grout. During TBM tunneling, a large amount of waste soil is generated, containing fine sand particles and high-clay silt particles suitable for producing high-concentration slurry. Summary of the Invention

[0004] This application aims to solve one of the aforementioned technical problems in the prior art. To this end, embodiments of this application provide a system for utilizing excavated soil from a dual-mode shield tunneling machine in composite strata with slurry water.

[0005] This application also provides a method for using a dual-mode shield tunneling machine spoil utilization system based on composite strata slurry underwater.

[0006] According to an embodiment of the first aspect of this application, a composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system is provided, including a shield tunneling machine for tunnel shield excavation construction; A slurry-water separation system is used to separate the excavated material from the slurry generated by the tunnel boring machine in slurry mode. The shield tunneling slurry conditioning system is used to condition the slurry separated from the slurry to meet the tunneling needs of the shield machine in slurry mode; A filter press system is used to filter wastewater and excess mud generated during construction to form clean water and mud cake. A thick slurry preparation system is used to produce finished thick slurry from the filter cake produced by the filter press system; The excavated soil washing system is used to wash and select the excavated soil generated by the tunnel boring machine in TBM mode. The thick slurry injection system is used to mix the finished thick mud slurry with water glass and then inject it into the radial injection hole of the shield body of the tunnel boring machine.

[0007] The aforementioned composite stratum slurry underwater dual-mode shield tunneling machine waste soil utilization system has at least the following beneficial effects: The composite stratum slurry underwater dual-mode shield tunneling machine waste soil utilization system of this application can process and recycle the waste soil generated by the shield tunneling machine, and the processed products can be used in shield tunneling construction. It not only solves the problem of disposal and transportation of these waste soils, but also saves construction costs, reduces the cost of purchasing construction raw materials, implements the concept of green construction, reduces the land occupation of transported waste soils, and has good economic and social benefits.

[0008] According to the first aspect of this application, the composite stratum slurry-water dual-mode shield tunneling machine muck utilization system includes a cutterhead system, a shield body system, a screw conveyor, a belt conveyor, a grouting system, and a slurry circulation system. The cutterhead system is used for the shield machine to cut the excavation face soil and rock. The shield body system has multiple radial injection holes in the front shield, middle shield, and tail shield. The screw conveyor is used for muck removal by the shield machine in TBM mode. The belt conveyor is used for muck transportation by the shield machine in TBM mode. The slurry circulation system is used for muck removal and transportation by the shield machine in slurry-water balance mode.

[0009] According to the composite stratum slurry-water dual-mode shield tunneling machine slag utilization system described in the first aspect of this application, the slurry-water separation system includes a pre-screening system and a dewatering screen system. The pre-screening system is used for pre-screening treatment of the slag-carrying slurry of the shield tunneling machine in slurry-water balance mode, and the dewatering screen system is used for dewatering treatment of the slag-carrying slurry.

[0010] According to the first aspect of this application, the composite stratum slurry-water dual-mode shield tunneling machine slag utilization system includes a sedimentation tank, a slurry adjustment tank, a thick slurry tank, and a clear water tank. The sedimentation tank is connected to the slurry outlet of the slurry-water separation system and is used to recover slurry treated by slurry-water separation. The slurry adjustment tank is connected to the sedimentation tank and is used to store the slurry overflowing from the sedimentation tank after sedimentation. The slurry adjustment tank is used to adjust the slurry required for tunneling in slurry-water mode. The thick slurry tank is connected to the sedimentation tank and is used to store the thick slurry after sedimentation in the sedimentation tank. The clear water tank is connected to the filter press system and is used to store the clear water filtered by the filter press system.

[0011] According to the composite stratum slurry underwater dual-mode shield tunneling machine slag utilization system described in the first aspect of this application, the thick slurry preparation system includes a crusher, a mixing tank, a slurry preparation tank, a storage tank, and a mixing station. The crusher is used to crush the mud cake separated by the filter press system. The mixing tank is connected to the slurry preparation tank and is used for mixing and reusing the mud cake. The slurry preparation tank is connected to the mixing tank and the clear water tank and is used to adjust the mud concentration in the mixing tank. The storage tank is connected to the slurry preparation tank and is used to store the mud in the slurry preparation tank that has reached a preset concentration. The mixing station is connected to the storage tank and is used for mixing the finished thick mud slurry.

[0012] According to the composite stratum mud underwater dual-mode shield tunneling machine slag utilization system described in the first aspect of this application, the thick slurry injection system includes a thick slurry tank, a water glass tank, and a thick slurry injection device. The thick slurry tank is connected to the thick slurry injection device. The thick slurry tank is used to store finished thick slurry and can continuously stir the finished thick slurry inside. The water glass tank is connected to the thick slurry injection device and is used to store water glass solution. The thick slurry injection device is connected to the radial injection hole of the shield body.

[0013] According to an embodiment of the second aspect of this application, a method for using the composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system based on the first aspect embodiment is provided, comprising the following steps: When the tunnel boring machine uses the slurry balance mode for tunneling, the treated slurry enters the slurry conditioning system of the tunnel boring machine, is redistributed and then returned to the mine, and the excess slurry enters the filter press system for treatment. When the tunnel boring machine (TBM) is excavating, the coarse particles of the excavated soil are transported off-site for use as roadbed and station fill material; the fine sand particles are subjected to quality testing and stored in storage bins for later use; the mud cakes that have undergone pressure filtration are crushed and stored in the stockpile for later use; the clean water that has undergone pressure filtration is transported to the clean water tank of the TBM slurry conditioning system. After the pH value in the clean water tank is adjusted to meet the preset value, it is used for cleaning or slurry mixing in civilized construction at the construction site, and excess clean water is discharged off-site. When mortar is needed for tunnel boring machine (TBM) construction, fine sand particles after slag treatment are used to prepare finished mortar; when thick slurry is needed for TBM construction, crushed mud cakes and fine sand particles after slag treatment are used to prepare finished high-concentration mud slurry.

[0014] According to the method of using the composite stratum slurry-water dual-mode shield tunneling machine excavation system described in the second aspect of this application, when the shield tunneling machine adopts the slurry-water balance mode for tunneling, the slurry-water separation system processes the waste excavation generated by the shield tunneling through a primary screening and a dewatering screen. After the waste excavation is processed by the primary screening and dewatering screen, coarse particles and fine sand particles are obtained.

[0015] According to the method of using the composite stratum mud-water underwater dual-mode shield tunneling machine slag utilization system described in the second aspect of this application, when grouting construction is required, fine sand particles are transported to the thick grout preparation system to make shield grout, and the clean water in the clear water tank is used as grout mixing water.

[0016] According to the method of using the composite stratum slurry-water dual-mode shield tunneling machine slag utilization system described in the second aspect of this application, when thick grouting construction is required, the crushed mud cake is transported to the thick grout preparation system for initial adjustment of the concentrated mud slurry. The amount of mud cake required per cubic meter of concentrated mud slurry is 0.6t. The clean water recovered by the filter press system can be used as slurry preparation water, soaked for 24 hours and continuously stirred. After the concentrated mud slurry in the mixing tank is dewatered and screened, it enters the thick grout preparation system. The viscosity and specific gravity of the mud slurry in the thick grout preparation system are tested. Low-concentration mud slurry or clean water is added to adjust the mud slurry concentration, and the mud slurry viscosity is adjusted to not less than 60s, and the mud slurry specific gravity is 1.4±0.5g / cm³.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a process flow diagram of the usage method of the composite stratum slurry underwater dual-mode shield tunneling machine slag utilization system according to an embodiment of this application; Figure 2 This is a schematic diagram of the shield tunneling spoil treatment process in the slurry balance mode, as described in the embodiments of this application. Figure 3 This is a schematic diagram of the TBM mode shield tunneling spoil disposal process in the embodiments of this application; Figure 4 This is a schematic diagram illustrating the use of recycled slag to produce shield tunneling grout and shield tunneling sand in the embodiments of this application.

[0019] Reference numerals: 1-Shield machine, 2-Primary screening system, 3-Dewatering screen system, 4-Coarse particles, 5-Fine sand particles, 6-Sedimentation tank, 7-Slurry mixing tank, 8-Thick slurry tank, 9-Storage silo, 10-Filter press, 11-Clear water tank, 12-Mud cake, 13-Crushed mud cake, 14-Sand washing machine, 15-Mixing tank, 16-Slurry mixing tank, 17-Storage tank, 18-Mixing station, 19-Thick slurry tank, 20-Water glass tank, 21-Mortar tank, 22-Radial injection hole of shield body, 23-Low concentration mud, 24-Dewatering screen. Detailed Implementation

[0020] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0021] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0024] Reference Figures 2 to 3 The composite stratum slurry-water dual-mode shield tunneling machine slag utilization system of this application embodiment includes shield tunneling machine 1, slurry-water separation system, shield slurry conditioning system, pressure filtration system, thick slurry preparation system, slag washing system and thick slurry injection system.

[0025] Among them, the shield machine 1 is used for tunnel shield excavation construction. The shield machine 1 includes a cutterhead system, a shield body system, a screw conveyor, a belt conveyor, a grouting system, and a mud circulation system. The cutterhead system is used by the shield machine 1 to cut the excavation face soil and rock. The shield body system has multiple shield body radial injection holes 22 in the front shield, middle shield, and shield tail. The screw conveyor is used for muck removal of the shield machine 1 in TBM mode. The belt conveyor is used for muck transportation of the shield machine 1 in TBM mode. The mud circulation system is used for muck removal and transportation of shield tunneling muck in slurry balance mode.

[0026] The slurry separation system is used to separate the excavated material from the slurry generated by the tunnel boring machine (TBM) 1 during slurry-water operation. Specifically, the slurry separation system is a black cyclone slurry separation system, which includes a pre-screening system and a dewatering screen system 24. The pre-screening system is used for pre-screening the slurry carried by the TBM in slurry-water balance mode, and it can separate large pieces of excavated material and coarse particles 4 from the excavated material. The dewatering screen system 24 is used for dewatering the slurry carried by the TBM, and it separates fine sand particles 5, clay particles, etc., from the excavated material. The separated slurry flows from the slurry outlet into the sedimentation tank 6 of the TBM slurry conditioning system, and after being mixed, it is returned to the mine.

[0027] The shield tunneling slurry conditioning system is used to condition the slurry separated from the slurry to meet the tunneling needs of the shield machine 1 in slurry mode. Specifically, the shield tunneling slurry conditioning system includes a sedimentation tank 6, a slurry conditioning tank 7, a thickening slurry tank 8, and a clear water tank 11. The sedimentation tank 6 is connected to the slurry outlet of the slurry separation system and is used to recover the slurry treated by slurry separation. The slurry conditioning tank 7 is connected to the sedimentation tank 6 and is used to store the slurry overflowing from the sedimentation tank 6 after sedimentation. The slurry conditioning tank 7 is used to condition the slurry required for tunneling in slurry mode. The thickening slurry tank 8 is connected to the sedimentation tank 6 and is used to store the thickened slurry after sedimentation in the sedimentation tank 6. The clear water tank 11 is connected to the filter press system and is used to store the clear water filtered by the filter press system.

[0028] The filter press system is used to filter wastewater and excess mud generated during construction to form clean water and mud cake 12. Specifically, the filter press system includes a filter press 10. The filter press 10 is connected to the thickening tank 8 and is used to filter the thick mud in the thickening tank 8, separating the mud into mud cake 12 and clean water.

[0029] The thick slurry preparation system is used to produce finished thick slurry from the filter cake 12 of the filter press system. Specifically, the thick slurry preparation system includes a crusher, a mixing tank 15, a slurry preparation tank 16, a storage tank 17, and a mixing station 18. The crusher is used to crush the filter cake 12 separated by the filter press system. The mixing tank 15 is connected to the slurry preparation tank 7 and is used to mix and reuse the filter cake 12. The slurry preparation tank 16 is connected to the mixing tank 15 and the clear water tank 11 and is used to adjust the slurry concentration in the mixing tank 15. The storage tank 17 is connected to the slurry preparation tank 16 and is used to store the slurry in the slurry preparation tank 16 that has reached a preset concentration. The mixing station 18 is connected to the storage tank 17 and is used to prepare the finished thick slurry.

[0030] The muck washing system is used to wash and select the muck generated by the tunnel boring machine 1 during TBM operation. Specifically, the muck washing system includes a bucket wheel sand washer 14, which is connected to a belt conveyor and is used to wash and select the muck, rocks, and fine sand particles 5 from the TBM tunnel boring machine.

[0031] The thick slurry injection system is used to mix the finished thick slurry with water glass and then inject it into the radial injection hole 22 of the shield body of the tunnel boring machine 1. Specifically, the thick slurry injection system includes a thick slurry tank 19, a water glass tank 20, and a thick slurry injection device. The thick slurry tank 19 is connected to the thick slurry injection device and is used to store the finished thick slurry. The thick slurry tank 19 can continuously stir the finished thick slurry inside. The water glass tank 20 is connected to the thick slurry injection device and is used to store the water glass solution. The thick slurry injection device is connected to the radial injection hole 22 of the shield body.

[0032] Through the coordination of various systems, the waste soil generated by the tunnel boring machine can be processed and recycled, and the processed products can be used in the tunnel boring construction. This not only solves the problem of disposal and transportation of these waste soils, but also saves construction costs, reduces the cost of purchasing construction raw materials, implements the concept of green construction, and reduces the land occupation of transported waste soils, which has good economic and social benefits.

[0033] This application embodiment also provides a method for using the above-mentioned composite stratum slurry underwater dual-mode shield tunneling machine 1 spoil utilization system, which specifically includes the following steps: When tunnel boring machine 1 is excavating in slurry balance mode, the treated slurry enters the slurry conditioning system, is redistributed, and then returned to the shaft. Excess slurry enters the filter press system for further treatment. When tunnel boring machine 1 is excavating in slurry balance mode, the slurry separation system processes the waste soil generated during tunneling through primary screening and dewatering screen 24. After processing by primary screening and dewatering screen 24, the waste soil yields coarse particles 4 and fine sand particles 5.

[0034] When the tunnel boring machine 1 is excavating in TBM mode, the coarse particles 4 that have been treated with slag are transported off-site for use as roadbed and station fill; the fine sand particles 5 that have been treated are quality tested and stored in storage bin 9 for later use; the mud cake 12 that has been treated with pressure filtration is crushed and stored in the stockpile for later use; the clean water that has been treated with pressure filtration is transported to the clean water tank 11 of the tunnel boring machine slurry conditioning system. After the pH value in the clean water tank 11 is adjusted to meet the preset value, it is used for cleaning or slurry mixing in civilized construction on the construction site. Excess clean water is discharged off-site.

[0035] When mortar is needed for shield tunneling, fine sand particles 5 after slag treatment are used to prepare finished mortar; when thick slurry is needed for shield tunneling, crushed mud cake 1312 after slag treatment and fine sand particles 5 are used to prepare finished high-concentration mud.

[0036] When grouting is required, fine sand particles 5 are transported to the thick grout preparation system to prepare shield grout, and the clear water in the clear water tank 11 is used as grout mixing water.

[0037] When thick grouting is required, the crushed mud cake 12 is transported to the thick grout preparation system for initial thick grouting. The amount of mud cake 12 required per cubic meter of thick grout is 0.6t. The clean water recovered by the filter press system can be used as grouting water. Soak for 24 hours and stir continuously. After the thick grout in the mixing tank 15 is dewatered and screened 24 times, it enters the thick grout preparation system. The viscosity and specific gravity of the grout in the thick grout preparation system are tested. Low-concentration grout 23 or clean water is added to adjust the grout concentration. The grout viscosity is adjusted to not less than 60s and the grout specific gravity is 1.4±0.5g / cm³.

[0038] In a specific embodiment, the finished concentrated mud slurry and water glass mixture are also called thick slurry. During the mixing process, some of the silicate anions in the water glass react chemically with the calcium ions, magnesium ions, and other cations in the finished concentrated mud slurry to generate gels such as calcium silicate and magnesium silicate. The reaction equation for the formation of calcium silicate is Ca2+ + SiO32- = CaSiO3, and the reaction equation for the formation of magnesium silicate is SiO32- + Mg2+ = MgSiO3↓. Silicic acid is a colloidal substance with strong gelling properties. These gels bind fine sand together to form a gel-like substance. Some silicate ions in water glass combine with calcium ions in the finished thick mud to form insoluble calcium salts, thereby delaying the coagulation of the thick mud and keeping it in a gel state for a long time. Under the action of calcium silicate, magnesium silicate and other gels and calcium salts, the thick mud has a certain degree of self-stability and water-proofing. When injected into the shield, it can form a stable buffer layer. During the tunneling process in air-assisted mode or TBM mode, the buffer layer formed by the thick mud can effectively block water from the rear, keeping the soil chamber in a relatively sealed state. At the same time, it reduces the disturbance to the surrounding soil during the tunneling process of the shield machine 1, and reduces the impact of the shield machine 1 on the surrounding soil. This allows the shield machine 1 to tunnel safely and efficiently in complex strata such as water-rich, shallowly buried, and fractured strata or when tunneling under buildings and structures.

[0039] like Figure 1 As shown, the specific usage method is as follows: Step 1: When tunnel boring machine 1 is tunneling in slurry balance mode, the slurry (tunnel excavation debris) carried by the slurry balance mode shield excavation debris treatment method shall be used to treat the slurry (tunnel excavation debris). Step 2: The treated mud enters the shield tunneling slurry conditioning system, is redistributed, and then returned to the mine. Excess mud enters the filter press system for further processing.

[0040] Step 3: When tunnel boring machine 1 is tunneling in TBM mode, the tunnel boring machine excavation and soil treatment method of TBM mode shall be used to treat the tunnel boring machine excavation and soil. Step 4: The coarse particles 4 that have undergone slag treatment are transported off-site for use as fill material in roadbeds and stations; Step 5: Perform quality testing on the treated fine sand particles 5 and store them in the storage silo 9 for later use; Step 6: Crush the filter cake 12 after pressure filtration and store it in the stockpile for later use; Step 7: The filtered water is transported to the clean water tank 11. After the pH value in the clean water tank 11 is adjusted to meet the requirements, it is used for cleaning or grouting in the construction site. Excess clean water is discharged.

[0041] Step 8: When mortar is needed for tunnel boring, use fine sand particles 5 after the slag has been treated to prepare finished mortar. Step 9: When thick slurry is required for shield tunneling, high-concentration slurry is prepared by mixing crushed mud cake 1312 after slag treatment and fine sand particles 5.

[0042] The specific construction method for step one is as follows: Step 1.1: When the tunnel boring machine 1 is tunneling in slurry balance mode, the Black Cyclone slurry separation system processes the waste soil generated during tunneling through the primary screening system 2 and the dewatering screen 24 system 3. Step 1.2: The waste soil is processed by the primary screening system 2 and the dewatering screen 24 system 3 to obtain coarse particles 4 and fine sand particles 5.

[0043] The specific construction method for step two is as follows: Step 2.1: The treated mud is transported to sedimentation tank 6 in the shield tunneling slurry conditioning system for three-stage natural sedimentation; Step 2.2: After sedimentation, the clean upper layer of sludge overflows into the slurry conditioning tank 7 through the upper opening of the sedimentation tank 6, while the thick sludge with more particles in the lower layer is transported to the thickening tank 8. Step 2.3: Adjust the mud in the slurry mixing tank 7 to the concentration required for tunneling, and then transport it to the cutterhead of the tunnel boring machine 1.

[0044] Step 2.4: The thick slurry in the thickening tank 8 is transported to the filter press 10 for pressing the sludge cake 12 and filtering the water.

[0045] The specific construction method for step three is as follows: Step 3.1: When the tunnel boring machine 1 is excavating in TBM mode, the excavated soil is transported to the sand washing machine 14 by belt conveyor for washing and selecting stones and fine sand particles 5.

[0046] Step 3.2: The mud slurry generated during the washing process is transported to the filter press system for pressing the mud cake 12 and filtering the clean water.

[0047] The specific construction method for step eight is as follows: Step 8.1: When grouting construction is required, the fine sand particles 5 are transported to the mixing plant 18 to make shield mortar. According to the mix ratio requirements, 50.75t of fine sand particles are required per cubic meter of finished mortar. The clean water in the clear water tank 11 can be used as grout mixing water.

[0048] Step 8.2: The prepared mortar is transported to mortar tank 2121 via pipeline and horizontal transportation for shield tunneling mortar construction.

[0049] The specific construction method for step nine is as follows: Step 9.1: When thick grouting is required, the broken mud cake 12 is transported to the mixing tank 15 for initial adjustment of the thick grout. The amount of mud cake 12 required per cubic meter of thick grout is 0.6t. The clean water recovered by the filter press 10 can be used as grouting water. Soak for 24 hours and continue stirring.

[0050] Step 9.2: The concentrated mud in the mixing tank 15 is transported to the dewatering screen 24 for screening and then enters the slurry mixing tank 16. The viscosity and specific gravity of the mud are tested. Low-concentration mud 23 or clean water is added to adjust the mud concentration. The mud viscosity is adjusted to not less than 60s and the mud specific gravity is about 1.4g / cm³ to meet the construction requirements.

[0051] Step 9.3: Transfer the concentrated mud that meets the construction requirements in the mixing tank 16 to the storage tank 17 for storage and later use.

[0052] Step 9.4: The stored concentrated mud slurry is transported to the mixing plant 18, and fine sand particles 5 are added to prepare the finished concentrated mud slurry. The amount of fine sand particles 5 required per cubic meter of finished concentrated mud slurry is 0.75t.

[0053] Step 9.5: The finished thick slurry is transported to the thick slurry tank 19 on the No. 2 trolley of the tunnel boring machine 1 via pipeline and horizontal transport. At the same time, the water glass is transported to the water glass tank 20 on the No. 2 trolley. The mixture of finished thick slurry and water glass is injected into the gap between the shield body and the excavated soil through the thick slurry injection equipment.

[0054] In summary, by adopting the above construction plan, the beneficial effects of this application are as follows: 1. The slag from the shield tunneling machine in the slurry balance mode is recycled. The slurry carrying the slag in the slurry balance mode is processed by the pre-screening system and the dewatering screen 24 system 3 to obtain coarse particles 4 and fine sand particles 5. 2. The TBM-mode shield tunneling excavation soil is recycled. The excavation soil in the TBM mode is cleaned into clean stones and fine sand particles through the excavation soil washing system. The mud water generated during the washing process is then treated by pressure filtration. 3. The coarse particles and stones separated from the two modes are transported off-site as roadbed and station filler, reducing the cost of transporting excavated soil and soil and occupying the site. 4. Fine sand particles 5 are stored in storage bin 9 as materials for shield tunneling mortar and shield tunneling thick slurry, reducing the cost of purchasing construction raw materials; 5. In the mud-water model, the recycled mud is mixed and returned to the well for reuse; 6. Excess mud generated by the mud-water mode and mud-water generated by the TBM mode are subjected to pressure filtration to obtain mud cake 12 and clean water; 7. After being crushed, mud cake 12 is stored in the stockpile as a material for making thick mud slurry; 8. The pH value of the clean water is adjusted in the clean water tank 11. Once it meets the requirements, it is used for cleaning and slurry preparation at the construction site. Excess clean water is discharged to reduce water costs at the construction site.

[0055] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A system for utilizing excavated soil from a dual-mode shield tunneling machine in composite strata and underwater mud-water conditions, characterized in that: include Tunnel boring machines (TBMs) are used for tunnel boring operations. A slurry-water separation system is used to separate the excavated material from the slurry generated by the tunnel boring machine in slurry mode. The shield tunneling slurry conditioning system is used to condition the slurry separated from the slurry to meet the tunneling needs of the shield machine in slurry mode; A filter press system is used to filter wastewater and excess mud generated during construction to form clean water and mud cake; A thick slurry preparation system is used to produce finished thick slurry from the filter cake produced by the filter press system; The excavated soil washing system is used to wash and select the excavated soil generated by the tunnel boring machine in TBM mode. The thick slurry injection system is used to mix the finished thick mud slurry with water glass and then inject it into the radial injection hole of the shield body of the tunnel boring machine.

2. The composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 1, characterized in that: The tunnel boring machine (TBM) includes a cutterhead system, a shield system, a screw conveyor, a belt conveyor, a grouting system, and a mud circulation system. The cutterhead system is used by the TBM to cut the excavation face soil and rock. The shield system has multiple radial injection holes in the front shield, middle shield, and tail shield. The screw conveyor is used for muck removal in TBM mode. The belt conveyor is used for muck transportation in TBM mode. The mud circulation system is used for muck removal and transportation in slurry balance mode.

3. The composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 1, characterized in that: The mud-water separation system includes a pre-screening system and a dewatering screen system. The pre-screening system is used for pre-screening the slag-carrying mud of the tunnel boring machine in mud-water balance mode, and the dewatering screen system is used for dewatering the slag-carrying mud.

4. The composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 1, characterized in that: The shield tunneling slurry conditioning system includes a sedimentation tank, a slurry conditioning tank, a thickening slurry tank, and a clear water tank. The sedimentation tank is connected to the slurry outlet of the slurry separation system and is used to recover slurry that has undergone slurry separation treatment. The slurry conditioning tank is connected to the sedimentation tank and is used to store the slurry that overflows from the sedimentation tank after sedimentation. The slurry conditioning tank is used to prepare the slurry required for tunneling in slurry-water mode. The thickening slurry tank is connected to the sedimentation tank and is used to store the thickened slurry after sedimentation in the sedimentation tank. The clear water tank is connected to the filter press system and is used to store the clear water filtered by the filter press system.

5. The composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 4, characterized in that: The thick slurry preparation system includes a crusher, a mixing tank, a slurry preparation tank, a storage tank, and a mixing station. The crusher is used to crush the mud cake separated by the filter press system. The mixing tank is connected to the slurry preparation tank and is used for mixing and reusing the mud cake. The slurry preparation tank is connected to the mixing tank and the clear water tank and is used to adjust the slurry concentration in the mixing tank. The storage tank is connected to the slurry preparation tank and is used to store the slurry in the slurry preparation tank that has reached a preset concentration. The mixing station is connected to the storage tank and is used for mixing the finished thick slurry.

6. The composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 1, characterized in that: The thick slurry injection system includes a thick slurry tank, a water glass tank, and a thick slurry injection device. The thick slurry tank is connected to the thick slurry injection device. The thick slurry tank is used to store the finished thick slurry and can continuously stir the finished thick slurry inside. The water glass tank is connected to the thick slurry injection device and is used to store water glass solution. The thick slurry injection device is connected to the radial injection hole of the shield body.

7. A method for using the composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to any one of claims 1 to 6, characterized in that, Includes the following steps: When the tunnel boring machine uses the slurry balance mode for tunneling, the treated slurry enters the slurry conditioning system of the tunnel boring machine, is redistributed and then returned to the mine, and the excess slurry enters the filter press system for treatment. When the tunnel boring machine (TBM) is excavating, the coarse particles that have undergone slag treatment are transported off-site for use as fill material in roadbeds and stations. The fine sand particles after treatment are tested for quality and stored in the storage silo for later use. The mud cake after pressure filtration is crushed and stored in the stockpile for later use. The clean water after pressure filtration is transported to the clean water pool of the shield tunnel slurry adjustment system. After the pH value in the clean water pool is adjusted to meet the preset value, it is used for cleaning or slurry mixing in civilized construction on the construction site. Excess clean water is discharged. When mortar is needed for tunnel boring machine (TBM) construction, fine sand particles after slag treatment are used to prepare finished mortar; when thick slurry is needed for TBM construction, crushed mud cakes and fine sand particles after slag treatment are used to prepare finished high-concentration mud slurry.

8. The method of using the composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 7, characterized in that: When the tunnel boring machine adopts the slurry balance mode for tunneling, the slurry separation system processes the waste soil generated during tunneling through primary screening and dewatering screening. After primary screening and dewatering screening, the waste soil is processed into coarse particles and fine sand particles.

9. The method of using the composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 7, characterized in that: When grouting is required, fine sand particles are transported to the thick grout preparation system to prepare shield grout, and the clear water in the clear water tank is used as grout mixing water.

10. The method of using the composite stratum slurry underwater dual-mode shield tunneling machine spoil utilization system according to claim 7, characterized in that: When thick grouting is required, the broken mud cake is transported to the thick grout preparation system for initial adjustment of the thick grout. The amount of mud cake required per cubic meter of thick grout is 0.6t. The clean water recovered by the filter press system can be used as grouting water, soaked for 24 hours and continuously stirred. After the thick mud in the mixing tank is dewatered and screened, it enters the thick mud preparation system. The viscosity and specific gravity of the mud in the thick mud preparation system are tested. Low-concentration mud or water is added to adjust the mud concentration, so that the mud viscosity is adjusted to not less than 60s and the mud specific gravity is 1.4±0.5g / cm³.

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