CN-122017156-A - Early warning method and system for determining high-pressure trigger instability threshold through supergravity test

CN122017156ACN 122017156 ACN122017156 ACN 122017156ACN-122017156-A

Abstract

The application relates to the technical field of landfill safety monitoring, and particularly discloses a pre-warning method and a pre-warning system for determining a high-pressure trigger instability threshold value by a supergravity test. And then, the destabilization is induced by bottom gas injection under the hypergravity environment, the whole process pressure and displacement data are synchronously acquired at high frequency to establish a critical pressure ratio threshold value, and finally, the critical pressure ratio threshold value is compared with the pressure ratio obtained by on-site real-time monitoring for judging, so that the accurate early warning of the destabilization risk is realized.

Inventors

HU JIE
KE HAN
ZHANG CHENCHENG
LI JINGHANG
ZHAN LIANGTONG
CHEN YUNMIN

Assignees

浙江大学

Dates

Publication Date: 20260512
Application Date: 20260410

Claims (10)

1. The utility model provides a method for early warning of high-pressure trigger instability threshold value determined by a hypergravity test, which is characterized by comprising the following steps: S1, carrying out statistical analysis and physical model scaling estimation on an obtained field investigation original data stream to obtain a model configuration parameter set containing a centrifugal scaling proportion, an artificial material proportion and a simulation liquid formula; s2, constructing a physical model in a centrifugal machine based on a model configuration parameter set and executing centrifugal acceleration loading to construct a supergravity test environment system; S3, in a supergravity test environment system, carrying out overall process monitoring on an air pressure experimental value of a pore in the model, an upper earth covering pressure experimental value and slope displacement data through bottom air injection and synchronous high-frequency acquisition to obtain a destabilizing process data set; s4, determining a critical air pressure ratio threshold based on the destabilizing process data set; S5, determining a site real-time air pressure ratio reflecting the actual working condition of the current landfill based on a site air pressure value and a site soil pressure value in a site monitoring data stream acquired from the target landfill; And S6, performing risk comparison and judgment on the on-site real-time air pressure ratio and the critical air pressure ratio threshold value to determine whether to generate an early warning signal of high air pressure triggering instability.
2. The method for early warning of the high-pressure triggering instability threshold determined by the hypergravity test according to claim 1, wherein the method is characterized in that the original data stream is surveyed on site, the original data stream comprises macroscopic geometrical dimension data, solid-phase geotechnical characteristic data and liquid-phase physicochemical rheological data, the macroscopic geometrical dimension data comprise the total height of a prototype pile, the characteristic depth of a target instability area and the slope gradient of a site, the solid-phase geotechnical characteristic data comprise a prototype trash auger Kong Keli grading curve, prototype trash soil dry density and organic matter content percentage, and the liquid-phase physicochemical rheological data comprise the bubbling volume index of site leachate and the bubble half-life of the site leachate.
3. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 2, wherein step S1 comprises: Calculating and extracting the centrifugal simulation scale proportion based on macroscopic geometric dimension data in the on-site investigation original data stream and combining with the load capacity of a centrifugal machine to obtain a sub-data stream of the centrifugal scale proportion and physical and chemical characteristics; Fitting the mass fractions of the basic components of turf, quartz sand and kaolin based on the dry density and the organic matter content percentage of prototype garbage soil in the physical and chemical characteristic sub-data stream to obtain an artificial material proportion and liquid characteristic data packet; establishing a concentration mapping relation based on the on-site percolate foaming volume index and the on-site percolate foam half-life in the liquid characteristic data packet, and reversely calculating the mass concentration of the surfactant to determine a simulated liquid formula; And carrying out structural verification and encapsulation on the centrifugal scale proportion, the artificial material proportion and the simulated liquid formula to obtain a model configuration parameter set.
4. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 1, wherein step S2 comprises: constructing a pre-buried sensor model box based on the artificial material proportion, the centrifugal scale proportion and the simulated liquid formula extracted from the model configuration parameter set; Installing a microporous aeration pipe network and a liquid injection pipeline at a reserved interface of a pre-buried sensor model box and connecting external control equipment to construct an assembly completion model system; Calculating a target angular speed according to the centrifugal scale proportion, driving the assembled model system to be loaded to the target rotating speed in a grading manner, and injecting simulated percolate to obtain a supergravity field with stable liquid level; And carrying out system state verification and ready packaging on the supergravity field with stable liquid level to obtain a supergravity test environment system.
5. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 1, wherein step S3 comprises: performing micro-flow gas injection and foam evolution induction on the supergravity test environment system to obtain a dynamic loading system; synchronously reading a sensor value and a camera image in a dynamic loading system by using a data acquisition system at a fixed sampling frequency, and calculating an air pressure change rate and detecting displacement to acquire an original time sequence data packet; A full field displacement vector is determined based on the raw timing data, and the destabilizing moment is locked based on the instantaneous speed threshold and valid time window data is truncated to obtain a destabilizing process dataset.
6. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 1, wherein step S4 comprises: Analyzing the destabilizing process data set to locate the destabilizing moment, backtracking limit balance state data of a previous sampling point, and extracting pore air pressure experimental values and upper earth covering pressure experimental values of all measuring points at the moment to obtain a transient pressure data matrix; traversing the transient pressure data matrix, and executing dimensionless ratio calculation of pore air pressure and total overlying stress on each measuring point to obtain a discrete critical ratio set; A critical barometric pressure ratio threshold is determined based on the discrete critical ratio set.
7. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 1, wherein step S5 comprises: Drilling and installing operations are carried out on the target landfill site based on the field engineering implementation instruction and the monitoring point position planning so as to construct a deployed monitoring network; Activating a deployed monitoring network to perform multi-physical-quantity flow collection and performing filtering denoising treatment to obtain a field physical-quantity data flow containing a field air pressure value and a field soil pressure value; and reading time frame data of the field physical quantity data stream, and performing dimensionless operation by utilizing the air pressure and soil pressure data at the same moment to obtain the field real-time air pressure ratio.
8. The method for early warning of determining a high air pressure trigger instability threshold according to the hypergravity test of claim 1, wherein step S6 comprises: reading a field real-time air pressure ratio and a critical air pressure ratio threshold value, and executing risk index comparison calculation by combining a preset safety redundancy coefficient to obtain a dynamic risk index reflecting the destabilization critical approximation degree; inputting the dynamic risk index into a multi-level classifier to perform logic discrimination, and dividing a safety zone, a warning zone and a high risk instability zone from low to high according to a numerical interval to obtain risk assessment metadata; Analyzing the risk assessment metadata, and combining the geographic information to synthesize and distribute alarm information when the risk level reaches the warning standard so as to output an early warning signal.
9. The method of claim 6, wherein determining the threshold of critical air pressure ratio based on a set of discrete critical ratios comprises: Calculating the normalized critical distance index of the absolute coordinates of each measuring point to obtain a space feature enhancement data set containing a binary group of the normalized critical distance index and the discrete critical ratio set; Determining an adaptive threshold function parameter set based on the spatial feature enhancement data set; And performing global discretization mapping on the field monitoring grid coordinate set based on the self-adaptive threshold function parameter set to obtain a space self-adaptive threshold field as the critical air pressure ratio threshold.
10. An early warning system for determining a high-pressure trigger instability threshold value through a hypergravity test, which is characterized by comprising the following components: The model parameter configuration module is used for carrying out statistical analysis and physical model scaling estimation on the acquired on-site investigation original data stream to obtain a model configuration parameter set comprising centrifugal scaling proportion, artificial material proportion and simulated liquid formula; The hypergravity physical modeling module is used for constructing a physical model in the centrifugal machine based on the model configuration parameter set and executing centrifugal acceleration loading to construct a hypergravity test environment system; the unsteady process monitoring module is used for carrying out overall process monitoring on the pore air pressure experimental value, the upper earth covering pressure experimental value and the slope displacement data in the model through bottom air injection and synchronous high-frequency acquisition in the supergravity test environment system so as to obtain an unsteady process data set; The critical air pressure ratio identification module is used for determining a critical air pressure ratio threshold value based on the destabilizing process data set; The field working condition sensing module is used for determining a field real-time air pressure ratio reflecting the actual working condition of the current landfill based on a field air pressure value and a field soil pressure value in a field monitoring data stream acquired from the target landfill; And the instability risk early warning judging module is used for carrying out risk comparison judgment on the on-site real-time air pressure ratio and the critical air pressure ratio threshold value so as to determine whether to generate an early warning signal for triggering instability by high air pressure.

Description

Early warning method and system for determining high-pressure trigger instability threshold through supergravity test Technical Field The application relates to the technical field of landfill safety monitoring, in particular to an early warning method and system for determining a high-pressure trigger instability threshold value through a supergravity test. Background Urban domestic refuse landfills are becoming increasingly interesting for long-term safe operation as a long-term and still important disposal means for urban solid waste. In some high-water-level or wet landfill sites, because the leachate contains higher concentration of organic matters and surfactants, the landfill gas is extremely easy to combine with liquid to form foam flow in the migration process, and the air resistance effect generated by the foam flow can cause the deep pore air pressure to be remarkably accumulated and exceed the pore hydraulic pressure, so that the effective stress of a pile body is greatly reduced. Conventional landfill stability monitoring means usually focus on ground displacement observation or ground water level monitoring, however, ground displacement signals often have significant hysteresis, when obvious displacement is detected, a penetrating sliding surface is often formed in a pile body, and early warning is difficult to realize. Meanwhile, the existing early warning indexes mainly include critical water level, so that the dominant role of high air pressure in inducing landslide disasters is ignored, and a quantitative threshold judgment standard for high air pressure triggering instability is lacked. In the aspect of laboratory research, the conventional heavy environmental test model is limited by geometric dimensions, so that the effective stress at the bottom of the model is far smaller than the high-stress working condition at the deep part of an actual landfill, and the simulated gas-liquid migration characteristics and the simulated damage rule have obvious deviation from the actual engineering site. In addition, because the internal environment of the landfill has high complexity and heterogeneity, a single pressure monitoring value is difficult to adapt to the early warning requirements of different depths and different positions, so that the existing early warning mechanism has the technical bottleneck of missing report or frequent false report. Therefore, how to truly reduce the prototype stress field and accurately determine the quantification threshold value of high-pressure triggering instability through the supergravity technology has become a key problem to be solved in urgent need of improving the disaster prevention and reduction level of landfill sites. Disclosure of Invention The present application has been made to solve the above-mentioned technical problems. The application provides a pre-warning method and a pre-warning system for determining a high-pressure trigger instability threshold value through a hypergravity test. The technical scheme of the application is as follows: according to one aspect of the application, there is provided an early warning method for determining a high air pressure trigger instability threshold by a hypergravity test, comprising: S1, carrying out statistical analysis and physical model scaling estimation on an obtained field investigation original data stream to obtain a model configuration parameter set containing a centrifugal scaling proportion, an artificial material proportion and a simulation liquid formula; s2, constructing a physical model in a centrifugal machine based on a model configuration parameter set and executing centrifugal acceleration loading to construct a supergravity test environment system; S3, in a supergravity test environment system, carrying out overall process monitoring on an air pressure experimental value of a pore in the model, an upper earth covering pressure experimental value and slope displacement data through bottom air injection and synchronous high-frequency acquisition to obtain a destabilizing process data set; s4, determining a critical air pressure ratio threshold based on the destabilizing process data set; S5, determining a site real-time air pressure ratio reflecting the actual working condition of the current landfill based on a site air pressure value and a site soil pressure value in a site monitoring data stream acquired from the target landfill; And S6, performing risk comparison and judgment on the on-site real-time air pressure ratio and the critical air pressure ratio threshold value to determine whether to generate an early warning signal of high air pressure triggering instability. According to another aspect of the present application, there is provided an early warning system for determining a high air pressure trigger instability threshold by a hypergravity test, comprising: The model parameter configuration module is used for carrying out statistical analysis and physical model scaling est