CN-122021469-A - Method, system and storage medium for matching rotating speeds of ultra-large-diameter slurry shield short screw conveyor

CN122021469ACN 122021469 ACN122021469 ACN 122021469ACN-122021469-A

Abstract

The application provides a rotating speed matching method, a rotating speed matching system and a storage medium for an ultra-large diameter slurry shield short screw conveyor, and belongs to the technical field of shield construction slag discharge. Aiming at the problems that short spiral rotating speed depends on experience setting and lacks systematic matching logic in the prior art, the application simulates the deslagging process under different short spiral rotating speeds by constructing a CFD-DEM coupling simulation model of slurry fluid and rock slag particles based on the rotating speed and the propelling speed of a cutter head, defines slag accumulation quantity and conveying efficiency indexes, respectively builds a response model and constructs a comprehensive evaluation model, and under a given working condition, solves the matching rotating speed which enables the comprehensive performance to be optimal in an allowable interval by taking the short spiral rotating speed as an optimization variable. The method can realize effective balance of slag discharging efficiency and equipment abrasion, and improves tunneling stability and construction efficiency of the ultra-large-diameter slurry shield under complex geological conditions.

Inventors

WANG JUNPING
CHEN JIANFU
SHU JICHENG
YANG ZHANYONG
LU YUNYUN
LOU RUI
GUO SHOUZHI
Xiao Hongwan
XIA YIMIN
CHEN ZONGKAI
FANG XINSHENG
LI ZONGJIE
ZHAO ZHENNING
Geng Fangsheng
WANG TIANSHENG
JIA LEI
WANG YUHAO

Assignees

中铁十四局集团有限公司
中铁十四局集团大盾构工程有限公司
中南大学

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (8)

1. The rotating speed matching method of the ultra-large diameter slurry shield short screw conveyor is characterized by comprising the following steps of: step one, a three-dimensional solid model of a cutter head, an excavation bin, a slurry inlet pipeline and a short spiral conveyor is established based on a DEM, and a calculation domain of slurry fluid and rock residue particles is extracted from the three-dimensional solid model based on CFD; Step two, constructing a coupling motion simulation model of slurry fluid and rock slag particles in a calculation domain, wherein the coupling motion simulation model comprises the following concrete steps: based on CFD, outputting the slurry fluid as a continuous phase from the instantaneous velocity field and the pressure field of each grid; based on the DEM, outputting the position, the speed and the stress state of each particle by taking the rock slag particles as discrete particle groups, and counting the weight of the rock slag particles discharged from a slag discharge port of the short screw conveyor; performing grid-particle space mapping and time step synchronization, and interpolating an instantaneous speed field and a pressure field in a CFD calculation domain to the current position of each rock slag particle under the synchronous time step; Step three, using the rotating speed of a cutter disc, the propelling speed and the short spiral rotating speed as design variables, generating a plurality of groups of design variables to combine and run the coupling motion simulation model group by group, and obtaining a flow field result and a particle migration result of a conveying stage of the short spiral conveyor; Defining a slag accumulation amount index to represent the storage amount of rock slag particles in an excavation bin, and defining a conveying efficiency index to represent the slag discharging capacity of the short screw conveyor; based on the calculation results of the slag accumulation amount and the conveying efficiency, fitting respectively to obtain a slag accumulation amount response model and a conveying efficiency response model, and constructing a comprehensive evaluation model after standardized processing; and fifthly, under the condition of given cutter head rotating speed and propelling speed, taking the short spiral rotating speed as an optimization variable, and calculating the optimal short spiral rotating speed as the matching rotating speed of the short spiral conveyor in an allowable interval of the short spiral rotating speed based on the comprehensive evaluation model.
2. The method for matching the rotating speed of the ultra-large diameter slurry shield short screw conveyor according to claim 1, wherein, In the solid model, the cutter head and the short screw conveyor are arranged as rotating bodies, the short screw conveyor is provided with a short screw boundary, the pulp inlet pipeline is arranged as a speed inlet or a mass inlet, the slag discharge port of the short screw conveyor is arranged as a pressure outlet, and the excavation bin and the equipment wall are provided with non-slip boundaries.
3. The method for matching the rotating speed of the ultra-large diameter slurry shield short screw conveyor according to claim 2, wherein, In CFD, solving the slurry fluid as a continuous phase based on the mass conservation equation and the momentum conservation equation; In the DEM, the position, the speed and the stress state of each particle are solved based on a translational and rotational control equation of the rock slag particles.
4. The method for matching the rotating speed of the ultra-large diameter slurry shield short screw conveyor according to claim 3, In the third step, the design variables further include mud density, rheological parameters, and particle size distribution of the rock slag particles.
5. The method for matching the rotating speed of the ultra-large diameter slurry shield short screw conveyor according to claim 4, wherein, In the fourth step, the slag accumulation index is defined as a time average value of the quality of the rock slag in the excavation bin in a stable stage, wherein the stable stage is defined based on simulation time; the conveying efficiency index is defined as the ratio of the actual slag discharge mass flow to the theoretical maximum conveying capacity.
6. The method for matching the rotating speed of the ultra-large diameter slurry shield short screw conveyor according to claim 4, wherein, In step four, defining a wear index as a short screw conveyor operating time constraint; The wear index is defined as the time average of the erosion energy, work of contact or wear rate of the blade surfaces of the short screw conveyor.
7. A rotating speed matching system of a super-large diameter slurry shield short screw conveyor comprises a processor and a memory storing program instructions, and is characterized in that, The processor is configured to perform the ultra-large diameter slurry shield short screw conveyor speed matching method of any one of claims 1-6 when executing the program instructions.
8. A computer-readable storage medium comprising, A computer program stored thereon, which when executed by a processor, implements the method of any of the preceding claims 1-6.

Description

Method, system and storage medium for matching rotating speeds of ultra-large-diameter slurry shield short screw conveyor Technical Field The application relates to the technical field of shield construction deslagging, in particular to a rotating speed matching method, a rotating speed matching system and a storage medium of a super-large-diameter slurry shield short screw conveyor. Background The ultra-large diameter slurry shield is widely applied to cross-sea and river-crossing tunnels and urban underground engineering, and has strong adaptability to high water pressure and high complex geological conditions and high tunneling stability. In the slurry shield tunneling process, rock slag generated by cutting of a cutter head is continuously discharged through a slag discharging system after being wrapped by circulating slurry. Along with the increase of the diameter of the shield and the increase of the complexity of working conditions, the traditional deslagging mode carried by slurry is easy to cause the retention and accumulation and local blockage of rocks at the bottom of an excavation bin, so that the faults of cutter torque rise, pressure fluctuation, cutter secondary abrasion and the like are caused. Aiming at the problems, the short screw conveyor can be arranged at the bottom of the excavation bin, and the high-efficiency slag discharge is carried out by matching the stirring slurry slag with the mechanical conveying mode. However, short screw operating parameters, in particular short screw speeds, in short screw conveyors are currently set empirically, without forming an interpretable logic decision rule. In addition, the revolving speed and the propelling speed (both are set parameters) of the cutterhead are constrained by geology and construction organization, if the short spiral revolving speed is quickly and quantitatively matched under the set parameters so as to achieve both slag discharging efficiency and low equipment abrasion, the short spiral revolving speed should not be an empirical value. In other words, the existing principle of matching between the short spiral speed and the predetermined parameter lacks systematic decision logic. Disclosure of Invention The application provides a rotating speed matching method of an ultra-large diameter slurry shield short screw conveyor, which can give out systematic short screw rotating speed according to the rotating speed and the propelling speed of a cutter head so as to cooperate with slag discharging efficiency and equipment wear rate. The technical scheme of the application is as follows: The rotating speed matching method of the ultra-large diameter slurry shield short screw conveyor comprises the following steps: step one, a three-dimensional solid model of a cutter head, an excavation bin, a slurry inlet pipeline and a short spiral conveyor is established based on a DEM, and a calculation domain of slurry fluid and rock residue particles is extracted from the three-dimensional solid model based on CFD; Step two, constructing a coupling motion simulation model of slurry fluid and rock slag particles in a calculation domain, wherein the coupling motion simulation model comprises the following concrete steps: based on CFD, outputting the slurry fluid as a continuous phase from the instantaneous velocity field and the pressure field of each grid; based on the DEM, outputting the position, the speed and the stress state of each particle by taking the rock slag particles as discrete particle groups, and counting the weight of the rock slag particles discharged from a slag discharge port of the short screw conveyor; performing grid-particle space mapping and time step synchronization, and interpolating an instantaneous speed field and a pressure field in a CFD calculation domain to the current position of each rock slag particle under the synchronous time step; Step three, using the rotating speed of a cutter disc, the propelling speed and the short spiral rotating speed as design variables, generating a plurality of groups of design variables to combine and run the coupling motion simulation model group by group, and obtaining a flow field result and a particle migration result of a conveying stage of the short spiral conveyor; Defining a slag accumulation amount index to represent the storage amount of rock slag particles in an excavation bin, and defining a conveying efficiency index to represent the slag discharging capacity of the short screw conveyor; based on the calculation results of the slag accumulation amount and the conveying efficiency, fitting respectively to obtain a slag accumulation amount response model and a conveying efficiency response model, and constructing a comprehensive evaluation model after standardized processing; and fifthly, under the condition of given cutter head rotating speed and propelling speed, taking the short spiral rotating speed as an optimization variable, and calculating the optimal short spiral