CN-122017158-A - Lining grouting repair simulation device and method for dynamic water environment

CN122017158ACN 122017158 ACN122017158 ACN 122017158ACN-122017158-A

Abstract

The invention relates to the technical field of material physical property measurement, in particular to a lining grouting repair simulation device and a simulation method for a water-running environment, wherein the device comprises a main body model unit, a grouting system, a variable-frequency pulsation loading assembly and a slurry loss dynamic monitoring assembly, the method comprises reference environment construction and calibration, initial water-running characteristic extraction, four-dimensional monitoring in the grouting process, loss quantity inversion calculation and double-index comprehensive evaluation, and the technology of 'high-fidelity simulation of water-running conditions, digital inversion in the loss process and double-dimensional evaluation of repair efficiency' is constructed, so that the problem of industry pain points with poor water-running grouting simulation distortion and evaluation means is solved.

Inventors

LIN YUFENG
LI HAILIN
HE GUODONG
LIU ZHIQIANG
ZHENG BO
PEI TAOTAO
CHEN PENG

Assignees

中铁西南科学研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20260415

Claims (10)

1. The utility model provides a move water environment lining slip casting restoration analogue means which characterized in that includes: The main body model unit is internally provided with a test chamber, the test chamber is provided with a water inlet end, a water outlet end and a grouting port, a lining test piece (4) to be tested is arranged in the test chamber, a simulated fracture channel is arranged in the lining test piece (4) to be tested, and a simulated lining gap is arranged between the lining test piece (4) to be tested and the test chamber; A grouting system in communication with the simulated lining clearance or the simulated fracture channel; the variable-frequency pulsating loading assembly (5) is connected to the water inlet end of the test chamber, and the variable-frequency pulsating loading assembly (5) is used for applying periodic pulsating water pressure into the test chamber to form a non-constant flow field; the slurry loss dynamic monitoring assembly (6) is connected to the water outlet end of the test chamber, and the slurry loss dynamic monitoring assembly (6) is used for collecting turbidity data and flow data of fluid flowing out of the water outlet end in real time.
2. The dynamic water environment lining grouting repair simulation device according to claim 1, wherein the main body model unit comprises a pressure-bearing barrel body (1), an upper pressing plate (2) and a lower pressing plate (3), and the upper pressing plate (2) and the lower pressing plate (3) are connected to two ends of the pressure-bearing barrel body (1) in a sealing manner; The pressure-bearing barrel body (1) is internally provided with a water permeable plate and a lining test piece (4) to be tested in sequence along the water flow direction, the water permeable plate is used for simulating surrounding rock seepage, and the simulated lining clearance is a reserved clearance between the water permeable plate and the lining test piece (4) to be tested.
3. The hydrodynamic environment lining grouting repair simulation device according to claim 2, wherein the lining test piece (4) to be tested comprises two concrete test pieces (41) and a crack simulation gasket (42), the two concrete test pieces (41) are spliced and fixed through a fastener, and the crack simulation gasket (42) is located on the contact surface of the two concrete test pieces (41) and serves as a model penetration channel.
4. The dynamic water environment lining grouting repairing simulation device according to claim 1, wherein the slurry loss dynamic monitoring assembly (6) comprises a turbidity detection unit and an instantaneous flow monitoring unit which are connected in series on a water outlet pipeline.
5. A method for simulating grouting restoration of a moving water environment lining, which is based on a simulation device as defined in any one of claims 1-4 and comprises the following steps: S1, constructing a reference fluid environment in the test chamber, measuring concentration characteristic physical parameters under different slurry concentrations by utilizing the slurry loss dynamic monitoring assembly (6), and constructing a correlation mapping model between the concentration characteristic physical parameters and the slurry concentration; Step S2, starting the variable-frequency pulsation loading assembly (5), and applying a preset time-varying hydraulic boundary condition to the test chamber; step S3, starting the grouting system to perform grouting repair, and maintaining the time-varying hydraulic boundary condition in the whole grouting operation process; synchronously collecting the characteristic physical parameters of the instantaneous flow and the instantaneous concentration of the water outlet end on a grouting time shaft by using the slurry loss dynamic monitoring component (6), and constructing a four-dimensional monitoring data set of the grouting process including a time dimension; s4, calling the four-dimensional monitoring data set, and converting the characteristic physical parameter of the instantaneous concentration on the time sequence into the instantaneous loss concentration by utilizing the correlation mapping model; s5, after the slurry is solidified, the time-varying hydraulic boundary condition is applied again, and the final state fluid dynamics transmission characteristic index after repair is measured; And constructing a double-index evaluation system comprising a substance retention dimension and a plugging efficiency dimension by combining the accumulated slurry loss quality and the total grouting quality, and comprehensively evaluating the grouting repair effect.
6. The method for simulating grouting restoration of a moving water environment lining according to claim 5, wherein the concentration characteristic physical parameter is one or more selected from a fluid turbidity value, a fluid conductivity value, a fluid optical density value and an ultrasonic attenuation coefficient; the correlation mapping model is a nonlinear function based on polynomial fitting or neural network regression.
7. The method for simulating grouting restoration of a hydrodynamic environment lining according to claim 5, wherein the method for obtaining the initial hydrodynamic transmission characteristic index of the simulated fracture channel comprises the steps of: step S21, starting the variable-frequency pulsation loading component (5) to generate a basic hydrostatic pressure And a synthetic time-varying hydraulic boundary condition consisting of multiple frequency sinusoidal pulsating components : , wherein, Is the first The pressure amplitude of the individual frequency components, In order to be of an angular frequency, For the initial phase position, Is the total number of frequency components; step S22, at the sampling frequency Synchronous acquisition of effluent flow response And input pressure Obtaining a discrete time series dataset Wherein , The number of the sampling points is calculated; Step S23, constructing an unsteady flow differential equation describing the dynamic characteristics of the simulated fracture channel based on the fluid dynamics principle: , wherein, Is the water power resistance coefficient, As a function of the inertia coefficient of the fluid, Is a residual term; step S24, utilizing the discrete time sequence data set, adopting a recursive least square method to carry out parameter solving on the unsteady flow differential equation so as to lead the objective function to be Minimization: calculating the initial hydraulic resistivity of the lining test piece (4) to be tested ; Step S25, initial hydraulic resistivity Defined as an initial hydrodynamic transmission characteristic index.
8. The method for simulating grouting restoration of a moving water environment lining according to claim 5, wherein the method for obtaining the accumulated slurry loss quality in the grouting process comprises the following steps: Step S41, time alignment is carried out on the four-dimensional monitoring data set, and a moving average filtering algorithm is adopted for the instantaneous flow sequence And transient concentration characteristic physical parameter sequence Smoothing to obtain a pretreated discrete sequence And Wherein Sampling point sequence number; Step S42, utilizing the correlation mapping model The characteristic physical parameter sequence after pretreatment Conversion to a net fluid loss concentration sequence : , wherein, A background fluid concentration reference value before grouting; Calculating instantaneous slurry loss mass flux at each sampling instant : ; Step S43, calculating and obtaining the accumulated slurry loss quality based on a numerical integral trapezoidal rule : , wherein, For the total number of sampling points in the grouting process, For a unit interval of time of a data sample, In order to achieve the initial moment of grouting, The grouting end time is the grouting end time.
9. The method for simulating grouting restoration of a moving water environment lining according to claim 7, wherein the method for constructing a double-index evaluation system comprises the following steps: According to accumulated slurry loss quality And a known total grouting quality Calculating the retention index of the grouting repaired substances : ; After the slurry is solidified, executing the step S2 again, and calculating the repaired final state hydraulic resistivity by using a recursive least square method Calculating the plugging efficiency index of grouting repair : 。
10. The method for simulating grouting repair of a moving water environment lining according to claim 9, wherein the step of comprehensively evaluating the grouting repair effect comprises the steps of: Calculating comprehensive evaluation score of dynamic water grouting repair effect : , wherein, And Is the corresponding weight coefficient; Setting a plugging efficacy threshold Threshold for comprehensive evaluation If (if) And is also provided with And judging that grouting repair is qualified.

Description

Lining grouting repair simulation device and method for dynamic water environment Technical Field The invention relates to the technical field of material physical property measurement, in particular to a dynamic water environment lining grouting repair simulation device and a simulation method, and especially relates to a two-dimensional quantitative evaluation on grouting plugging efficiency based on multi-physical field feature mapping and a fluid dynamics system identification algorithm. Background With the rapid development of underground transportation infrastructure, tunnels and underground works are often faced with lining cracking and water leakage damage during operation. The grouting method is the most main and effective means for treating the diseases at present, and is characterized in that slurry is injected into cracks and a void area behind a lining, and the dual purposes of water shutoff and reinforcement are realized through setting and hardening of the slurry. However, in the actual engineering environment, the underground water flow field is often in a dynamic water environment, and although the prior art has made a certain progress in the aspects of grouting material research and development and basic simulation test, the grouting repair simulation in the dynamic water environment still has limitations: most of the existing grouting simulation test devices are designed based on hydrostatic pressure or constant flow rate, pulsating water flow cannot be reproduced, and under the actual flowing water condition, slurry is easy to disperse and run away, so that the effective retention rate is low. The current test evaluation system focuses on the detection of the grouting result (such as excavation observation and final impervious pressure test), and lacks of real-time dynamic monitoring of the grouting process. In the prior art, only a single evaluation index is generally adopted for the evaluation of the grouting effect, and the quality of the grouting process is difficult to carry out fine classification. Disclosure of Invention The invention aims to solve the technical problems, and provides a dynamic water environment lining grouting repair simulation device and a simulation method, which can simulate complex time-varying hydraulic boundaries and comprehensively evaluate repair efficiency. The invention is realized by the following technical scheme: a hydrodynamic environment lining grouting repair simulation device, comprising: The main body model unit is internally provided with a test chamber, the test chamber is provided with a water inlet end, a water outlet end and a grouting port, a lining test piece to be tested is arranged in the test chamber, a simulated fracture channel is arranged in the lining test piece to be tested, and a simulated lining gap is arranged between the lining test piece to be tested and the test chamber; A grouting system in communication with the simulated lining clearance or the simulated fracture channel; the variable-frequency pulsation loading assembly is connected to the water inlet end of the test chamber and is used for applying periodic pulsation water pressure into the test chamber to form a non-constant flow field; The slurry loss dynamic monitoring assembly is connected to the water outlet end of the test chamber and is used for collecting turbidity data and flow data of fluid flowing out of the water outlet end in real time. Optionally, the main body model unit comprises a pressure-bearing barrel body, an upper pressing plate and a lower pressing plate, wherein the upper pressing plate and the lower pressing plate are connected to two ends of the pressure-bearing barrel body in a sealing way; the pressure-bearing barrel body is internally provided with a water permeable plate and a lining test piece to be tested in sequence along the water flow direction, the water permeable plate is used for simulating surrounding rock seepage, and the simulated lining clearance is a reserved clearance between the water permeable plate and the lining test piece to be tested. Optionally, the lining test piece to be tested comprises two concrete test pieces and a crack simulation gasket, the two concrete test pieces are spliced and fixed through a fastener, and the crack simulation gasket is positioned on the contact surface of the two concrete test pieces and used as a model permeation channel. Optionally, the slurry loss dynamic monitoring assembly comprises a turbidity detection unit and an instantaneous flow monitoring unit which are connected in series on the water outlet pipeline. A method for simulating grouting restoration of a lining in a hydrodynamic environment, which is based on the simulation device, and comprises the following steps: S1, constructing a reference fluid environment in the test chamber, measuring concentration characteristic physical parameters under different slurry concentrations by utilizing the slurry loss dynamic monitoring compon