A slurry balance shield tunnel slurry adjusting method

Abstract

A kind of slurry balance shield slurry adjustment method, comprising: S1, according to the current working condition of shield machine excavation, select one from three kinds of slurry adjustment and management mode;S2, measure the initial density, initial volume, initial viscosity of circulating slurry before shield machine excavation;S3, after shield machine excavation a ring ends, determine the medium used in slurry adjustment is water or new slurry bentonite slurry;S4, calculate the volume of discharged slurry, the time of discharged slurry or calculate the density of circulating slurry at any time in flexible management mode FM.Considering the influence of regularity change of circulating slurry volume, density, viscosity value on the safety of shield machine excavation, the amount of slurry adjustment can be quickly calculated, the practical engineering problems can be solved, and the method has the advantages of wide applicability, high safety, strong practicability and high popularization and application value.

Description

Technical Field

[0001] This invention relates to the field of tunnel boring machine slurry treatment technology, specifically to a method for adjusting slurry in tunnel boring machines with slurry-water balance. Background Technology

[0002] The mud adjustment system of the mud treatment system consists of circulating mud storage facilities, mud pumps, pipelines, anti-settling equipment, etc. Its functions include storing the circulating mud required for tunnel boring machine excavation, adjusting the viscosity, specific gravity and other parameters of the circulating mud to meet the requirements of tunnel boring machine excavation and slag carrying, and realizing the recycling of mud.

[0003] The automation of mud adjustment and management in slurry balance shield tunneling systems has been a research hotspot. Current research largely focuses on using advanced sensors to collect real-time data on equipment and mud operating parameters, reacting flexibly to these parameters. For example, if mud density increases, some is discharged and replaced with clean water or freshly prepared low-density bentonite slurry to reduce density. This reactive approach relies on the personal experience and intuition of the operators, failing to establish a logical and procedural operational paradigm. More importantly, because this method inevitably involves mud adjustments during tunneling, it can lead to inaccurate gamma-ray excavation monitoring, making it impossible to determine whether the tunnel boring machine (TBM) is over-excavating or under-excavating, potentially causing major safety accidents such as ground subsidence or structural instability. Furthermore, this reactive approach results in unpredictable changes in mud parameters, making it impossible for TBM operators to predict these changes and their impact on tunneling, thus compromising the safety of shield tunneling construction. Summary of the Invention

[0004] The technical problem this invention aims to solve is to provide a method for adjusting slurry in tunnel boring machines (TBMs) with slurry balance. This method includes a complete set of logically sound and procedural operational paradigms, standardizing the slurry treatment process. It avoids the illogical nature of reactive, experience-based operations and addresses the problem of unpredictable slurry index changes that prevent TBM operators from forecasting their impact on tunnel boring machine progress. This makes slurry index changes more regular and controllable, improving the operator's ability to predict slurry index changes and thus enhancing the safety of TBM construction.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for adjusting mud in slurry-balanced shield tunneling machines, featuring a mud adjustment and management model (SMM), specifically includes three standard mud adjustment and management paradigms: one-loop adjustment mode (OROM), expected management mode (EVM), and flexible management mode (FM); including the following steps: Step 1: Based on the current tunneling conditions of the tunnel boring machine, select one of the three mud adjustment and management modes: One-Ring-One-Adjustment Mode (OROM), Expected Management Mode (EVM), and Flexible Management Mode (FM). Step 2: Measure the initial density, initial volume, and initial viscosity of the circulating mud before the tunnel boring machine begins excavation; Step 3: After the tunnel boring machine has completed one ring of excavation, measure the density, volume, and viscosity of the current circulating mud and compare it with the allowable viscosity value to determine whether the medium used for mud adjustment is clean water or fresh bentonite slurry. Step 4: If the mud adjustment and management mode is selected as the one-loop adjustment mode OROM, and if the mud adjustment medium is selected as clean water, calculate the discharge volume, the clean water replenishment volume, the discharge time, the clean water replenishment time, and the solid phase weight during discharge. Step 5: If the mud adjustment and management mode is selected as the one-loop-one-adjustment mode OROM, and if the mud adjustment medium is selected as the newly prepared bentonite mud, calculate the discharge volume, the replenishment volume of the newly prepared bentonite mud, the discharge time, the replenishment time of the newly prepared bentonite mud, the solid phase weight in the discharge, and the solid phase weight in the replenishment of the newly prepared bentonite mud. Step 6: If the mud adjustment and management mode is the expected management mode EVM, determine whether the current process is an intermediate process or the final process based on whether the current circulating mud density measured after the tunnel boring machine has completed one ring of tunneling reaches or is close to the expected circulating mud density. Step 7: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if the current process is in progress, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 8: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if this is the final process, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 9: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is newly prepared bentonite mud, and if the current process is in the middle, calculate the discharge volume, the volume of newly prepared bentonite mud, the discharge time, the time of newly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the newly prepared bentonite mud replenishment. Step 10: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is freshly prepared bentonite mud, and if this is the final process, calculate the discharge volume, the volume of freshly prepared bentonite mud, the discharge time, the time of freshly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the freshly prepared bentonite mud replenishment. Step 11: If the mud conditioning and management mode is Flexible Management Mode FM, and if the mud conditioning medium is clean water, enter the planned mud discharge time and clean water replenishment time, and calculate the circulating mud density, mud discharge volume, clean water replenishment volume, and solid phase weight during mud discharge at any given time. Step 12: If the mud adjustment and management mode is Flexible Management Mode FM, and if the mud adjustment medium is freshly prepared bentonite mud, input the planned mud discharge time and the time for replenishing freshly prepared bentonite mud, and calculate the circulating mud density at any time.

[0006] In Step 2 above, before the tunnel boring machine begins excavation, the initial density ρ of the circulating mud is measured. init Initial volume V init Initial viscosity μ init ; In Step 3, after the tunnel boring machine completes one ring of excavation, the current circulating mud density ρ is measured. end Volume V end Viscosity value μ end , and the permissible viscosity value μ end By comparison, it was determined that the medium used for mud conditioning was either clean water or fresh bentonite slurry.

[0007] The specific steps in Step 4 and Step 5 above are as follows: Slurry discharge volume V discharge The equation is expressed as: ; The particle solid density is Gs; Add clean water volume V water The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; The pumping capacity of the slurry pump is P. discharge ; Hydration time t water The equation is expressed as: ; The pumping capacity of the clean water pump is P. water ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Among them, V dry-discharge This represents the volume of the solid phase during slurry discharge. In Step 5: Slurry discharge volume Vdischarge The equation is expressed as: ; The density of the newly prepared bentonite slurry is: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; The pumping capacity of the grouting pump is P. add ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: .

[0008] The specific steps in Steps 6-10 above are as follows: In Step 6, the desired circulating mud density is set to ρ. expect The density increase of the circulating mud in each cycle is ρ increase ,like Then the current state is judged as an intermediate process; if or ρ expect ≤ρ end If so, the current state is determined to be the final process; In Step 7, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ; Water replenishment time t water The equation is expressed as: ; Slurry discharge volume V discharge The equation is expressed as: ; Add clean water volume V water The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; In Step 8, the discharge volume V discharge The equation is expressed as: ; Add clean water volume V water The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Hydration time t water The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; In Step 9, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; Slurry discharge volume V discharge The equation is expressed as: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: ; In Step 10, the discharge volume V discharge The equation is expressed as: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: .

[0009] The specific steps in Step 11 and Step 12 above are as follows: In Step 11, let the excavation area of ​​the tunnel boring machine be S, and the ring width be L; let the pure tunneling time for each ring be T, where t is any time from 0 to T; and let the total solid volume separated from each ring be V. total-solid The total liquid volume separated in each loop is V. total-liquid : Density of circulating mud at any given time The equation is expressed as: ; In Step 12, the density of the circulating mud at any given time The equation is expressed as: .

[0010] In Step 9 above, the initial density ρ of the circulating mud before the tunnel boring machine begins excavation. init Represented as: ; Among them, W init V is the initial weight of the circulating mud. init This represents the initial volume of the circulating mud. At any time t during the tunneling process without any adjustments ex With circulating mud density ρ ex The relationship is represented as: ; Where, m ex V refers to the rate at which the mass of excavated material increases due to tunneling in the circulating mud. ex The rate at which the volume of excavated material increases in the circulating mud due to tunneling; at this point, 0 ≤ t ex ≤T, where T is the time required to excavate one ring; At any time t during the tunneling process ex And discharge tdischarge After a certain period of time, the density ρ of the circulating mud ex-dis Represented as: ; Where, m discharge V refers to the rate at which the mass of circulating mud decreases due to discharge. discharge This refers to the rate at which the volume of circulating mud decreases during discharge; at this point, 0 ≤ t. discharge ≤t ex ; At any time t during the tunneling process ex And the grouting time t add Afterwards, the circulating mud density ρ ex-add The relationship is represented as: ; Where, m add V refers to the rate at which mass is increased by replenishing the circulating mud. add This refers to the rate at which the volume of circulating mud increases due to replenishment; at this point, 0 ≤ t add ≤t ex ; At any time t during the tunneling process ex And discharge t discharge Time and grouting time t add Afterwards, the density of the circulating mud ρ ex-dis-add The relationship is represented as: ; At this time, 0≤t discharge ≤t ex And 0≤t add ≤t ex ; Initial density ρ of circulating mud after tunnel boring machine excavation end Represented as: ; Among them, W end V represents the final weight of the circulating mud. end This represents the final volume of the circulating mud. During the interval t interval Within a time and discharge t int-discharge After a certain period of time, the density ρ of the circulating mud int-dis Represented as: ; Where, m int-discharge V refers to the rate at which the mass of slurry is reduced during the slurry discharge interval. int-discharge This refers to the rate at which the volume of slurry decreases during the slurry discharge interval; at this point, 0 ≤ t int-discharge ≤t interval ; During the interval t intervalWithin a time and for replenishing slurry t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; Where, m int-add V refers to the rate at which the mass of slurry increases during the interval between slurry replenishments. int-add This refers to the rate at which the volume of slurry increases during the interval between slurry replenishments; at this point, 0 ≤ t. int-add ≤t interval ; During the interval t interval Within a time and discharge t int-discharge Time and grout replenishment t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; At this time, 0≤t int-discharge ≤t interval And 0≤t int-add ≤t interval .

[0011] This invention provides a slurry adjustment method for tunnel boring machines (TBMs) using slurry balance. By introducing the SMM (Self-Management Model) method for slurry adjustment and management, it categorizes the methods for slurry adjustment and management under different tunneling conditions into three types. Based on a comparison of the circulating slurry viscosity measurement value with the allowable value, the slurry adjustment and management medium is determined. The invention calculates the volume of slurry discharged, the time of slurry discharge, the mass of solid phase in the discharged slurry, the volume of water added during adjustment, the time of water addition, the volume of newly prepared bentonite slurry added, the time of newly prepared bentonite slurry addition, and the mass of bentonite consumed when using water and freshly prepared bentonite slurry as slurry adjustment media under both the One-Ring-One-Adjustment (OROM) mode and the Desired Management (EVM) mode. It also calculates the circulating slurry density at any given time under the Flexible Management (FM) mode. This invention considers the impact of the regular changes in circulating slurry volume, density, and viscosity on the tunneling safety of the TBM, and can quickly calculate the quantities discharged and added during slurry adjustment, solving practical engineering problems. It has the advantages of wide applicability, high safety, strong practicality, and high value for widespread application.

[0012] The present invention has the following beneficial effects: 1. This invention introduces the SMM method for mud conditioning and management; specifically, it includes three standard mud conditioning and management paradigms: One-Ring-One-Management (OROM), Expected Management (EVM), and Flexible Management (FM). 2. This invention introduces the SMM method for mud adjustment and management, which is applied to mud adjustment and management in three shield tunneling conditions: one-ring adjustment mode (OROM) for normal tunneling conditions; expected management mode (EVM) for temporary rapid tunneling conditions; and flexible management mode (FM) for rapid tunneling conditions in emergency situations. 3. This invention can accurately calculate the volume of mud discharged during mud conditioning, the time of mud discharge, and the mass of solid phase in the discharged mud; 4. This invention can accurately calculate the volume of water added during mud adjustment and the time required for water addition; 5. This invention can accurately calculate the volume of freshly prepared bentonite slurry to be added during slurry adjustment, the time for adding freshly prepared bentonite slurry, and the mass of bentonite consumed; 6. This invention has significant advantages such as strong logic, high precision, and ease of operation. It can achieve precise quantitative adjustment and management of circulating mud, so that the density and volume of circulating mud change regularly within the allowable range, solving the problem of difficulty in accurately calculating parameters when adjusting circulating mud in actual engineering. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a flowchart of a method for adjusting and managing circulating mud in a shield tunneling slurry treatment system, as described in an embodiment of the present invention. Figure 1 ; Figure 2 This is a flowchart of a method for adjusting and managing circulating mud in a shield tunneling slurry treatment system, as described in an embodiment of the present invention. Figure 2 ; Figure 3 This is the calculation result of the mud adjustment amount when using the one-loop-one-adjustment mode in the embodiment of the present invention; Figure 4 This is a graph showing the changes in mud volume and mud density during continuous 4-ring tunneling and adjustment in an embodiment of the present invention using the one-ring-one-adjustment mode. Figure 5 This refers to the mud adjustment calculation result when the desired management mode is used in the embodiments of the present invention; Figure 6 This is a graph showing the changes in mud volume and mud density during continuous 4-ring tunneling and adjustment when the desired management mode is used in an embodiment of the present invention. Figure 7 This is a graph showing the changes in the volume and density of circulating mud when a flexible management mode is adopted in an embodiment of the present invention. Detailed Implementation

[0014] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0015] A method for adjusting mud in slurry-balanced shield tunneling machines, featuring a mud adjustment and management model (SMM), specifically includes three standard mud adjustment and management paradigms: one-loop adjustment mode (OROM), expected management mode (EVM), and flexible management mode (FM); including the following steps: Step 1: Based on the current tunneling conditions of the tunnel boring machine, select one of the three mud adjustment and management modes: One-Ring-One-Adjustment Mode (OROM), Expected Management Mode (EVM), and Flexible Management Mode (FM). Step 2: Measure the initial density, initial volume, and initial viscosity of the circulating mud before the tunnel boring machine begins excavation; Step 3: After the tunnel boring machine has completed one ring of excavation, measure the density, volume, and viscosity of the current circulating mud and compare it with the allowable viscosity value to determine whether the medium used for mud adjustment is clean water or fresh bentonite slurry. Step 4: If the mud adjustment and management mode is selected as the one-loop adjustment mode OROM, and if the mud adjustment medium is selected as clean water, calculate the discharge volume, the clean water replenishment volume, the discharge time, the clean water replenishment time, and the solid phase weight during discharge. Step 5: If the mud adjustment and management mode is selected as the one-loop-one-adjustment mode OROM, and if the mud adjustment medium is selected as the newly prepared bentonite mud, calculate the discharge volume, the replenishment volume of the newly prepared bentonite mud, the discharge time, the replenishment time of the newly prepared bentonite mud, the solid phase weight in the discharge, and the solid phase weight in the replenishment of the newly prepared bentonite mud. Step 6: If the mud adjustment and management mode is the expected management mode EVM, determine whether the current process is an intermediate process or the final process based on whether the current circulating mud density measured after the tunnel boring machine has completed one ring of tunneling reaches or is close to the expected circulating mud density. Step 7: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if the current process is in progress, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 8: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if this is the final process, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 9: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is newly prepared bentonite mud, and if the current process is in the middle, calculate the discharge volume, the volume of newly prepared bentonite mud, the discharge time, the time of newly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the newly prepared bentonite mud replenishment. Step 10: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is freshly prepared bentonite mud, and if this is the final process, calculate the discharge volume, the volume of freshly prepared bentonite mud, the discharge time, the time of freshly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the freshly prepared bentonite mud replenishment. Step 11: If the mud conditioning and management mode is Flexible Management Mode FM, and if the mud conditioning medium is clean water, enter the planned mud discharge time and clean water replenishment time, and calculate the circulating mud density, mud discharge volume, clean water replenishment volume, and solid phase weight during mud discharge at any given time. Step 12: If the mud adjustment and management mode is Flexible Management Mode FM, and if the mud adjustment medium is freshly prepared bentonite mud, input the planned mud discharge time and the time for replenishing freshly prepared bentonite mud, and calculate the circulating mud density at any time.

[0016] In Step 2 above, before the tunnel boring machine begins excavation, the initial density ρ of the circulating mud is measured. init Initial volume V init Initial viscosity μ init ; In Step 3, after the tunnel boring machine completes one ring of excavation, the current circulating mud density ρ is measured. end Volume V end Viscosity value μ end , and the permissible viscosity value μ end By comparison, it was determined that the medium used for mud conditioning was either clean water or fresh bentonite slurry.

[0017] The specific steps in Step 4 and Step 5 above are as follows: Slurry discharge volume V discharge The equation is expressed as: ; The particle solid density is Gs; Add clean water volume V water The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; The pumping capacity of the slurry pump is P. discharge ; Hydration time t water The equation is expressed as: ; The pumping capacity of the clean water pump is P. water ; Weight of solid phase W during slurry dischargedry-discharge The equation is expressed as: ; Among them, V dry-discharge This represents the volume of the solid phase during slurry discharge. In Step 5: Slurry discharge volume V discharge The equation is expressed as ; The density of the newly prepared bentonite slurry is: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; The pumping capacity of the grouting pump is P. add ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: .

[0018] The specific steps in Steps 6-10 above are as follows: In Step 6, the desired circulating mud density is set to ρ. expect The density increase of the circulating mud in each cycle is ρ increase ,like Then the current state is judged as an intermediate process; if or ρ expect ≤ρ end If so, the current state is determined to be the final process; In Step 7, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ; Water replenishment time t water The equation is expressed as: ; Slurry discharge volume Vdischarge The equation is expressed as: ; Add clean water volume V water The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; In Step 8, the discharge volume V discharge The equation is expressed as: ; Add clean water volume V water The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Hydration time t water The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; In Step 9, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; Slurry discharge volume V discharge The equation is expressed as: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: ; In Step 10, the discharge volume Vdischarge The equation is expressed as: ; Volume V of newly prepared bentonite slurry add The equation is expressed as: ; Discharge time t discharge The equation is expressed as: ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ; Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ; Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: .

[0019] The specific steps in Step 11 and Step 12 above are as follows: In Step 11, let the excavation area of ​​the tunnel boring machine be S, and the ring width be L; let the pure tunneling time for each ring be T, where t is any time from 0 to T; and let the total solid volume separated from each ring be V. total-solid The total liquid volume separated in each loop is V. total-liquid : Density of circulating mud at any given time The equation is expressed as: ; In Step 12, the density of the circulating mud at any given time The equation is expressed as: .

[0020] In Step 9 above, the initial density ρ of the circulating mud before the tunnel boring machine begins excavation. init Represented as: ; Among them, W init V is the initial weight of the circulating mud. init This represents the initial volume of the circulating mud. At any time t during the tunneling process without any adjustments ex With circulating mud density ρ ex The relationship is represented as: ; Where, m exV refers to the rate at which the mass of excavated material increases due to tunneling in the circulating mud. ex The rate at which the volume of excavated material increases in the circulating mud due to tunneling; at this point, 0 ≤ t ex ≤T, where T is the time required to excavate one ring; At any time t during the tunneling process ex And discharge t discharge After a certain period of time, the density ρ of the circulating mud ex-dis Represented as: ; Where, m discharge V refers to the rate at which the mass of circulating mud decreases due to discharge. discharge This refers to the rate at which the volume of circulating mud decreases during discharge; at this point, 0 ≤ t. discharge ≤t ex ; At any time t during the tunneling process ex And the grouting time t add Afterwards, the circulating mud density ρ ex-add The relationship is represented as: ; Where, m add V refers to the rate at which mass is increased by replenishing the circulating mud. add This refers to the rate at which the volume of circulating mud increases due to replenishment; at this point, 0 ≤ t add ≤t ex ; At any time t during the tunneling process ex And discharge t discharge Time and grouting time t add Afterwards, the density of the circulating mud ρ ex-dis-add The relationship is represented as: ; At this time, 0≤t discharge ≤t ex And 0≤t add ≤t ex ; Initial density ρ of circulating mud after tunnel boring machine excavation end Represented as: ; Among them, W end V represents the final weight of the circulating mud. end This represents the final volume of the circulating mud. During the interval t interval Within a time and discharge t int-discharge After a certain period of time, the density ρ of the circulating mud int-dis Represented as: ; Where, mint-discharge V refers to the rate at which the mass of slurry is reduced during the slurry discharge interval. int-discharge This refers to the rate at which the volume of slurry decreases during the slurry discharge interval; at this point, 0 ≤ t int-discharge ≤t interval ; During the interval t interval Within a time and for replenishing slurry t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; Where, m int-add V refers to the rate at which the mass of slurry increases during the interval between slurry replenishments. int-add This refers to the rate at which the volume of slurry increases during the interval between slurry replenishments; at this point, 0 ≤ t. int-add ≤t interval ; During the interval t interval Within a time and discharge t int-discharge Time and grout replenishment t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; At this time, 0≤t int-discharge ≤t interval And 0≤t int-add ≤t interval .

[0021] Example: A method for adjusting the slurry in a slurry-balanced shield tunneling machine includes the following steps: S1, select the mud adjustment and management mode according to the current tunneling conditions of the tunnel boring machine; S2, Before the tunnel boring machine starts tunneling, measure the volume, density, and viscosity of the circulating mud. S3, after the tunnel boring machine has completed one ring of excavation, measure the volume, density, and viscosity of the circulating mud. S4. Based on the change pattern of viscosity value before the tunnel boring machine starts tunneling and after one tunneling cycle, the medium selected for mud adjustment is freshly prepared bentonite mud or clean water. S5, if the current mud adjustment and management mode is one-loop-one-adjustment mode (OROM), and the mud adjustment medium is freshly prepared bentonite mud, calculate the discharged mud volume, the discharge time, and the mass of solid phase in the discharged mud. The volume of freshly prepared bentonite slurry to be replenished, the time for replenishing freshly prepared bentonite slurry to be replenished, and the mass of bentonite consumed; S6, If the current mud adjustment and management mode is one-loop adjustment mode (OROM), and the mud adjustment medium is clean water, calculate the discharged mud volume, the discharge time, and the mass of solid phase in the discharged mud. The volume of water to be added and the time to add water; S7, If the current mud conditioning and management mode is the desired management mode EVM, and the mud conditioning medium is freshly prepared bentonite mud, calculate the discharged mud volume, the discharge time, and the mass of the solid phase in the discharged mud. The volume of freshly prepared bentonite slurry to be added, the time for adding freshly prepared bentonite slurry, the mass of bentonite consumed, and the density of the adjusted slurry; maintaining a constant volume. S8. If the current mud conditioning and management mode is the desired management mode (EVM), and the mud conditioning medium is clean water, calculate the discharged mud volume, the discharge time, and the mass of solid phase in the discharged mud. The volume of water added, the time for adding water, and the density of the adjusted mud; S9, if the current mud adjustment and management mode is flexible management mode FM, give the preset mud discharge time, water replenishment time, and fresh bentonite mud replenishment time, and calculate the circulating mud density, mud discharge volume, water replenishment volume, and fresh bentonite mud replenishment volume at any time. In S1, the mud in the circulating mud storage facility is set as the research object, that is, the mud after being separated by the separation equipment and before being returned to the shield tunneling shaft. In S1, the one-ring-one-adjustment mode OROM is selected for normal tunneling conditions, the expected management mode EVM is selected for temporary rapid tunneling, and the flexible management mode FM is selected for rapid tunneling in emergency situations. When using the one-ring-one-adjustment (OROM) mode, the density and volume of the circulating mud before the tunnel boring machine (TBM) begins excavation are taken as the initial state. After the TBM completes one ring of excavation, the density and volume of the circulating mud are taken as the final state. The goal of mud adjustment is to bring the final state back to the initial state. Then the TBM proceeds with the next ring of excavation, repeating the cycle to ensure that the density and volume of the circulating mud always exhibit a wave-like variation while remaining within acceptable limits. When using the Expected Management Mode (EVM), the density and volume of the circulating mud before the tunnel boring machine (TBM) begins its temporary rapid excavation are taken as the initial state. After the TBM completes one ring of excavation, the density and volume of the circulating mud are taken as the intermediate state. The goal of mud adjustment is to bring the volume of the circulating mud back to the initial state within a set interval, minimizing the mud density without deliberately aiming to return it to the initial state. Then, the TBM proceeds with the next ring of excavation, repeating the cycle to ensure that the volume of the circulating mud always changes in a wave-like pattern while remaining within acceptable limits, and that the density of the circulating mud always changes in a step-like pattern while remaining within acceptable limits. When the temporary rapid excavation ends, the density and volume of the circulating mud are taken as the final state, and the goal of mud adjustment is to bring the final state back to the initial state.

[0022] When using the flexible management mode (FM), the density of the circulating mud can be adjusted at any time during tunnel boring machine excavation or intervals to keep the volume and density of the circulating mud within the allowable range. In S2, the density and viscosity of the circulating mud before the tunnel boring machine (TBM) begins tunneling are measured using a mud hydrometer and a funnel viscometer, respectively; the depth H of the circulating mud before the TBM begins tunneling is measured using a level gauge. init ; Let the area of ​​the circulating mud storage device be S, and the volume of the circulating mud before the tunnel boring machine starts excavation be V. init =S H init ; In S3, the density and viscosity of the circulating mud after the tunnel boring machine (TBM) has completed one ring of tunneling are measured using a mud hydrometer and a funnel viscometer, respectively; the depth H of the circulating mud before the TBM begins tunneling is measured using a level gauge. end ; Let the area of ​​the circulating mud storage device be S, and the volume of circulating mud before the tunnel boring machine starts excavation be V. end =S H end ; The viscosity index of circulating mud exhibits nonlinear and unquantifiable characteristics. The circulating mud conditioning medium was confirmed based on actual measurements. In S5, calculate the volume of discharged mud, the time of discharged mud, the mass of solid phase in the discharged mud, the volume of freshly prepared bentonite mud, the time of freshly prepared bentonite mud, and the mass of bentonite consumed. In S6, calculate the volume of discharged mud, the time of discharged mud, the mass of solid phase in the discharged mud, the volume of replenished clean water, and the time of replenished clean water; In S7, calculate the volume of discharged mud, the time of discharge, and the mass of solid phase in the discharged mud. The volume of freshly prepared bentonite slurry, the time for replenishing freshly prepared bentonite slurry, the mass of bentonite consumed, and the density of the adjusted slurry. In S8, calculate the volume of discharged mud, the time of discharge, and the mass of solid phase in the discharged mud. The volume of water added, the time for adding water, and the density of the adjusted mud; In S9, the initial density ρ of the circulating mud before the tunnel boring machine excavates is... init Represented as: ; Among them, W init V is the initial weight of the circulating mud. init This represents the initial volume of the circulating mud. At any time t during the tunneling process without any adjustments ex With circulating mud density ρ ex The relationship is represented as: ; Where, m ex V refers to the rate at which the mass of excavated material increases due to tunneling in the circulating mud. ex The rate at which the volume of excavated material increases in the circulating mud due to tunneling; at this point, 0 ≤ t ex ≤T, where T is the time required to excavate one ring; At any time t during the tunneling process ex And discharge t discharge After a certain period of time, the density ρ of the circulating mud ex-dis Represented as: ; Where, m discharge V refers to the rate at which the mass of circulating mud decreases due to discharge. discharge This refers to the rate at which the volume of circulating mud decreases during discharge; at this point, 0 ≤ t. discharge ≤t ex ; At any time t during the tunneling process ex And the grouting time t add Afterwards, the density of the circulating mud ρ ex-add The relationship is represented as: ; Where, m add V refers to the rate at which mass is increased by replenishing the circulating mud. add This refers to the rate at which the volume of circulating mud increases due to replenishment; at this point, 0 ≤ t add ≤t ex ; At any time t during the tunneling process ex And discharge t discharge Time and grouting time tadd Afterwards, the density of the circulating mud ρ ex-dis-add The relationship is represented as: ; At this time, 0≤t discharge ≤t ex And 0≤t add ≤t ex ; Initial density ρ of circulating mud after tunnel boring machine excavation end Represented as: ; Among them, W end V represents the final weight of the circulating mud. end This represents the final volume of the circulating mud. During the interval t interval Within a time and discharge t int-discharge After a certain period of time, the density ρ of the circulating mud int-dis Represented as: ; Where, m int-discharge V refers to the rate at which the mass of slurry is reduced during the slurry discharge interval. int-discharge This refers to the rate at which the volume of slurry decreases during the slurry discharge interval; at this point, 0 ≤ t int-discharge ≤t interval ; During the interval t interval Within a time and for replenishing slurry t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; Where, m int-add V refers to the rate at which the mass of slurry increases during the interval between slurry replenishments. int-add This refers to the rate at which the volume of slurry increases during the interval between slurry replenishments; at this point, 0 ≤ t. int-add ≤t interval ; During the interval t interval Within a time and discharge t int-discharge Time and grout replenishment t int-add After a certain period of time, the density ρ of the circulating mud int-add Represented as: ; At this time, 0≤t int-discharge ≤t interval And 0≤t int-add ≤t interval .

[0023] Specifically, such as Figure 1As shown, this paper presents an analysis and calculation method for the adjustment and management of circulating mud in a shield tunneling slurry treatment system. This method is used for calculating the adjustment of circulating mud in a shield tunneling slurry treatment system. Specifically, it includes the following steps: S1: Assume the current tunnel boring machine is in normal tunneling mode, and select the one-ring-one-adjustment mode OROM; S2: Figure 3 The initial density of the circulating mud before tunneling was measured to be 1.1000 g / ml, and the initial circulation volume was 237 m³. 3 ; S3: Figure 3 The final density of the circulating mud after one loop of tunneling was measured to be 1.1818 g / ml, and the final circulation volume was 262 m³. 3 ; S4: Figure 3 Freshly prepared bentonite slurry was selected as the slurry preparation medium. S5: Figure 3 Calculate the volume of discharged mud, the time of discharged mud, the mass of solid phase in the discharged mud, the volume of freshly prepared bentonite mud to be added, the time of freshly prepared bentonite mud to be added, and the mass of bentonite consumed. Figure 4 Repeat steps S1 to S5 four times in total to obtain the density and volume change curves of the circulating mud. S1: Assume the current tunnel boring machine's advance status is temporary rapid tunneling, and select the desired management mode EVM; S2: Figure 4 The initial density of the circulating mud before tunneling was measured to be 1.1000 g / ml, and the initial circulation volume was 473 m³. 3 ; S3: Figure 4 The final density of the circulating mud after one loop of tunneling was measured to be 1.1927 g / ml, and the final circulation volume was 507 m³. 3 ; S4: Figure 4 Freshly prepared bentonite slurry was selected as the slurry preparation medium. S5: Figure 4 Calculate the volume of discharged mud, the time of discharged mud, the mass of solid phase in the discharged mud, the volume of freshly prepared bentonite mud to be added, the time of freshly prepared bentonite mud to be added, and the mass of bentonite consumed. Figure 6 Repeat steps S1 to S5 four times in total to obtain the density and volume change curves of the circulating mud. S1: Assume the current tunnel boring machine's advance status is temporary rapid tunneling, and select the flexible management mode (FM); S2: Figure 4 The initial density of the circulating mud before tunneling was measured to be 1.1000 g / ml, and the initial circulation volume was 473 m³. 3 ; S3: During the tunneling process, 100m3 of circulating mud is discharged at the 10th minute, and 90m3 of freshly prepared bentonite mud is added at the 15th minute; 100m3 of circulating mud is discharged at the 20th minute, and 90m3 of freshly prepared bentonite mud is added at the 25th minute. Figure 7 The density and volume change curves of the circulating mud were obtained.

[0024] This example provides a method for analyzing and calculating the adjustment and management of circulating mud in a shield tunneling slurry treatment system. The method includes: introducing the SMM (Self-Management Model) method for mud adjustment and management, classifying the mud adjustment and management methods for different tunneling conditions of the shield machine into three categories; determining the medium for mud adjustment and management based on a comparison of the measured and permissible values ​​of the circulating mud viscosity; calculating the volume of mud discharged, the time of mud discharge, the mass of solid phase in the discharged mud, the volume of water replenished during adjustment, the time of water replenishment, the volume of newly prepared bentonite mud replenishment, the time of newly prepared bentonite mud replenishment, and the mass of bentonite consumed when using clean water and freshly prepared bentonite mud as mud adjustment media under the One-Ring-One-Adjustment (OROM) mode and the Expected Management (EVM) mode; and calculating the circulating mud density at any given time under the Flexible Management (FM) mode. This invention considers the impact of the regular changes in the volume, density, and viscosity of the circulating mud on the tunneling safety of the shield machine, and can quickly calculate the quantities discharged and replenished during mud adjustment, solving practical engineering problems. It has the advantages of wide applicability, high safety, strong practicality, and high value for widespread application.

Claims

1. A method for adjusting the slurry in a slurry-balanced shield tunneling machine, characterized in that, The SMM (Self-Managed Mud) model includes three standard mud conditioning and management paradigms: One-Ring-One-Management (OROM), Expected Management (EVM), and Flexible Management (FM); and includes the following steps: Step 1: Based on the current tunneling conditions of the tunnel boring machine, select one of the three mud adjustment and management modes: One-Ring-One-Adjustment Mode (OROM), Expected Management Mode (EVM), and Flexible Management Mode (FM). Step 2: Measure the initial density, initial volume, and initial viscosity of the circulating mud before the tunnel boring machine begins excavation; Step 3: After the tunnel boring machine has completed one ring of excavation, measure the density, volume, and viscosity of the current circulating mud and compare it with the allowable viscosity value to determine whether the medium used for mud adjustment is clean water or fresh bentonite slurry. Step 4: If the mud adjustment and management mode is selected as the one-loop adjustment mode OROM, and if the mud adjustment medium is selected as clean water, calculate the discharge volume, the clean water replenishment volume, the discharge time, the clean water replenishment time, and the solid phase weight during discharge. Step 5: If the mud adjustment and management mode is selected as the one-loop-one-adjustment mode OROM, and if the mud adjustment medium is selected as the newly prepared bentonite mud, calculate the discharge volume, the replenishment volume of the newly prepared bentonite mud, the discharge time, the replenishment time of the newly prepared bentonite mud, the solid phase weight in the discharge, and the solid phase weight in the replenishment of the newly prepared bentonite mud. Step 6: If the mud adjustment and management mode is the expected management mode EVM, determine whether the current process is an intermediate process or the final process based on whether the current circulating mud density measured after the tunnel boring machine has completed one ring of tunneling reaches or is close to the expected circulating mud density. Step 7: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if the current process is in progress, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 8: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is clean water, and if this is the final process, calculate the discharge volume, water replenishment volume, discharge time, water replenishment time, and solid phase weight during discharge. Step 9: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is newly prepared bentonite mud, and if the current process is in the middle, calculate the discharge volume, the volume of newly prepared bentonite mud, the discharge time, the time of newly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the newly prepared bentonite mud replenishment. Step 10: If the mud conditioning and management mode is the desired management mode EVM, and if the mud conditioning medium is freshly prepared bentonite mud, and if this is the final process, calculate the discharge volume, the volume of freshly prepared bentonite mud, the discharge time, the time of freshly prepared bentonite mud replenishment, the solid phase weight in the discharge, and the solid phase weight in the freshly prepared bentonite mud replenishment. Step 11: If the mud conditioning and management mode is Flexible Management Mode FM, and if the mud conditioning medium is clean water, enter the planned mud discharge time and clean water replenishment time, and calculate the circulating mud density, mud discharge volume, clean water replenishment volume, and solid phase weight during mud discharge at any given time. Step 12: If the mud adjustment and management mode is Flexible Management Mode FM, and if the mud adjustment medium is freshly prepared bentonite mud, input the planned mud discharge time and the time for replenishing freshly prepared bentonite mud, and calculate the circulating mud density at any time.

2. The method for adjusting slurry in a slurry-balanced shield tunneling machine according to claim 1, characterized in that, In Step 2, before the tunnel boring machine begins excavation, the initial density ρ of the circulating mud is measured. init Initial volume V init Initial viscosity μ init ; In Step 3, after the tunnel boring machine completes one ring of excavation, the current circulating mud density ρ is measured. end Volume V end Viscosity value μ end , and the permissible viscosity value μ end By comparison, it was determined that the medium used for mud conditioning was either clean water or fresh bentonite slurry.

3. The method for adjusting slurry in a slurry-balanced shield tunneling machine according to claim 2, characterized in that, The specific steps of Steps 6-10 are as follows: In Step 6, the desired circulating mud density is set to ρ. expect The density increase of the circulating mud in each cycle is ρ increase ,like Then the current state is judged as an intermediate process; if or ρ expect ≤ρ end If so, the current state is determined to be the final process; In Step 7, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ； Water replenishment time t water The equation is expressed as: ； Slurry discharge volume V discharge The equation is expressed as: ； Add clean water volume V water The equation is expressed as: ； Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ； In Step 8, the discharge volume V discharge The equation is expressed as: ； Add clean water volume V water The equation is expressed as: ； Discharge time t discharge The equation is expressed as: ； Hydration time t water The equation is expressed as: ； Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ； In Step 9, let the intermediate interval be t. interval ; Discharge time t discharge The equation is expressed as: ； The pumping capacity of the grouting pump is P add ; Time for preparing new bentonite slurry (t) add The equation is expressed as: ； Slurry discharge volume V discharge The equation is expressed as: ； Volume V of newly prepared bentonite slurry add The equation is expressed as: ； Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ； Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: ； In Step 10, the discharge volume V discharge The equation is expressed as: ； Volume V of newly prepared bentonite slurry add The equation is expressed as: ； Discharge time t discharge The equation is expressed as: ； Time for preparing new bentonite slurry (t) add The equation is expressed as: ； Weight of solid phase W during slurry discharge dry-discharge The equation is expressed as: ； Add the weight of solid phase W in the newly prepared bentonite slurry dry-add The equation is expressed as: 。 4. The method for adjusting slurry in a slurry-balanced shield tunneling machine according to claim 2, characterized in that, The specific steps of Step 11 and Step 12 are as follows: In Step 11, let the excavation area of ​​the tunnel boring machine be S, and the ring width be L; let the pure tunneling time for each ring be T, where t is any time from 0 to T; and let the total solid volume separated from each ring be V. total-solid The total liquid volume separated in each loop is V. total-liquid : Density of circulating mud at any given time The equation is expressed as: ； In Step 12, the density of the circulating mud at any given time The equation is expressed as: 。

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