DE202022107159U1 - Apparatus for detecting combined parameter controlled initiation conditions of a mud flow caused by heavy rainfall - Google Patents

Abstract

Apparatus for detecting combined parameter-controlled initiation conditions of a mud flow caused by heavy rainfall, characterized in that the apparatus comprises a fluid model module, a mud flow material simulation module, a simulation experiment module, and a parameter combination identification module,
wherein the fluid model module is used to abstract and generalize the mathematical Bingham fluid model domain according to the physical mud flow model domain;
wherein the mudstream material simulation module is used to perform combinatorial design of mudstream material properties by simulating a gradation ratio of artificial particles;
wherein the simulation experiment module is used to perform an experiment for mud flow initiation through the Bingham fluid mathematical model domain and obtain the parameter combination that causes mud flow initiation; wherein a test for mechanical properties is performed on the mudstream material under the set water content, wherein the quantitative relationship between the mudstream water content and the parameters of the parameter combination is established; wherein the values of the parameters of the parameter combination are changed by controlling the water content of the mud flow material, wherein the combined parameter controlled initiation conditions of a mud flow caused by heavy rainfall are obtained by comparing the stress distribution difference of the mud flow sliding;
wherein the parameter combination identification module is used to identify whether the mud flow is triggered based on the combined parameter controlled triggering conditions of a heavy rainfall mud flow through the fluid model module according to the precipitation intensity and the properties of the mud flow material.

Description

TECHNICAL AREA

The utility model relates to the field of prevention and mitigation of natural disasters, in particular to an apparatus for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters.

STATE OF THE ART

Mudslide is a common geological disaster. Due to the limitations of mountainous terrain, city settlement is difficult, and some cities must be located in areas where mudslides are active, while some new cities are located in areas prone to mudslides because of the awareness of the dangers of mudslides is missing.

Heavy rainfall is the main trigger for the mud flow and previous research in this area has focused on probabilistic warnings, so little is known about the trigger conditions, slippage and steady state of the mud flow and effective detection methods are lacking.

Because the mud flow is a non-Newtonian fluid, and its intrinsic relationships and kinetic properties are very complex, and the test is difficult and expensive, most of the studies at home and abroad are based on testing and empirical analysis, the procedures and algorithms have significant limitations and are unable to study the dynamic mechanism of fluid movement of mudslides for landslides at depth, which must be simulated using effective mathematical models.

The mud flow has natural characteristics such as strong erosion and transport abilities and are capable of damaging various city facilities in their path through impact, siltation and clogging. During the movement of the mudflow, debris such as boulders and logs carried by the mudslide clog bridges and culverts, resulting in spillage beyond the outflow dam and increasing the extent of damage. When the mud flow stalls, the large amounts of sediment, rocks and other solid materials it carries are deposited, posing a silting hazard to various urban facilities within the deposition zone.

The mudflow monitoring facility currently in place uses precipitation amount thresholds as control conditions, but cannot make accurate detection and can only make probabilistic predictions. The success rates are unsatisfactory and too low. Most of the numerous geological mudflow disasters that have actually occurred have not been effectively identified. Since mud flow occurrences are mostly sudden and can be completed within a few minutes, conventional monitors are not capable of detecting mud flow initiation, so prediction requires an effective pre-identification monitor.

CONTENT OF PRESENT UTILITY MODEL

• eine Vorrichtung zum Erkennen der durch kombinierte Parameter gesteuerten Auslösungsbedingungen eines durch starke Regenfälle bewirkten Schlammstroms, wobei die Vorrichtung umfasst:
  • Bei der bevorzugten technischen Lösung,

The utility model can be achieved through the following technical solutions:

• an apparatus for detecting combined parameter controlled initiation conditions of a mud flow caused by heavy rainfall, the apparatus comprising:
  • With the preferred technical solution,

• Das Gebrauchsmuster stellt eine Vorrichtung zum Erkennen der durch kombinierte Parameter gesteuerten Auslösungsbedingungen eines durch starke Regenfälle bewirkten Schlammstroms bereit, wobei durch das Fluidmodellmodul das mathematische Bingham-Fluidmodellgebiet gemäß dem physikalischen Schlammstrommodellgebiet erstellt wird, wobei durch das Simulationsexperimentmodul die durch kombinierte Parameter gesteuerten Auslösungsbedingungen eines durch starke Regenfälle bewirkten Schlammstroms erhalten wird, sodass das Problem unklarer Steuerparameter und ungenauer Steuerbedingungen der aktuellen plötzlichen Schlammstromkatastrophen durch starke Regenfälle gelöst werden kann, um effektiv zu identifizieren, ob plötzliche starke Regenfälle das Auslösen des Schlammstroms bewirken, wobei plötzliche Schlammstromkatastrophen im Voraus erkannt und vorhergesagt werden können.

Compared to the state of the art, the utility model has the following advantages and beneficial effects:

• The utility model provides an apparatus for recognizing the combined parameter-controlled triggering conditions of a mud flow caused by heavy rainfall, wherein the fluid model module creates the mathematical Bingham fluid model area according to the physical mud flow model area, wherein the simulation experiment module detects the combined parameter-controlled triggering conditions of a heavy rain Mud flow caused by rainfall is obtained, so that the problem of unclear control parameters and inaccurate control conditions of the current heavy rain sudden mud flow disasters can be solved, to effectively identify whether heavy sudden rains cause the mud flow to be triggered, whereby mud flow sudden disasters can be detected and predicted in advance .

character list

• 1 ist ein strukturelles Diagramm einer Vorrichtung zum Erkennen der durch kombinierte Parameter gesteuerten Auslösungsbedingungen eines durch starke Regenfälle bewirkten Schlammstroms in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 2 ist ein schematisches Diagramm des Bingham-Fluidmodells für das Auslösen des Schlammstroms in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 3 ist eine schematische Darstellung des Erkennungsprinzips der Vorrichtung zum Erkennen der Auslösungsbedingungen eines durch starke Regenfälle bewirkten Schlammstroms in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters;
• 4 ist ein Isoplethe-Graph des Schlammstrom-Strömungsdrucks (Pa) in einem Ausführungsbeispiel des vorliegenden Gebrauchsmusters.

In order to explain more clearly the technical solutions of the embodiments of the present utility model or the prior art, the drawings necessary for the descriptions in the embodiments or the prior art are briefly described below. Apparently, the attached drawings in the following description are only some exemplary embodiments of the present utility model, and according to the structures shown in these drawings, other drawings can also be obtained without creative effort for those of ordinary skill in the art.

• 1 Fig. 14 is a structural diagram of an apparatus for recognizing the combined parameter-controlled initiation conditions of a mud flow caused by heavy rainfall in an embodiment of the present utility model;
• 2 Figure 13 is a schematic diagram of the Bingham fluid model for initiating mud flow in an embodiment of the present invention;
• 3 Fig. 12 is a schematic representation of the detection principle of the apparatus for detecting the initiation conditions of a mud flow caused by heavy rainfall in an embodiment of the present utility model;
• 4 Fig. 14 is an isopleth graph of mud stream flow pressure (Pa) in an embodiment of the present utility model.

DETAILED DESCRIPTION

The technical scheme of the utility model is described in detail below in connection with the accompanying drawings and working examples. Obviously, the described embodiments are part of the embodiments of the present utility model, but not all of the embodiments, and the embodiments of the present utility model are not limited thereto. All other embodiments obtained by those skilled in the art based on the embodiments in the present utility model without creative work belong to the scope of protection of the present utility model.

exemplary embodiments

The utility model is a fluid model module that includes a three-dimensional Bingham mudflow flow field model, which creates a disaster body in advance, through the simulation experiment module, the landslide mudslide fluid under the driving of a certain rainfall intensity simulates the distribution of the Bingham fluid velocity field and pressure field in advance and a precipitation field is adjusted to simulate the corresponding changes in mud flow displacement, determining if a trigger is present and what the operating condition of the trigger is, to provide the combined parameter controlled trigger conditions of a heavy rain induced mud flow wherein the parameter combination identification module identifies whether the mud flow is triggered according to the precipitation intensity and the properties of the mud flow material.

• das Fluidmodellmodul verwendet wird, um das mathematische Bingham-Fluidmodellgebiet gemäß dem physikalischen Schlammstrommodellgebiet zu abstrahieren und zu verallgemeinern.

As in the 1-4 shown, an apparatus for detecting the combined parameter controlled initiation conditions of a heavy rainfall mud flow of the present utility model comprises: a fluid model module, a mud flow material simulation module, a simulation experiment module, and a parameter combination identification module, wherein:

• the fluid model module is used to abstract and generalize the mathematical Bingham fluid model domain according to the physical mud flow model domain.

wobei τ die Scherspannung ist und $\frac{\text{du}}{\text{dy}}$

die Scherrate ist.The Bingham fluid is a kind of non-Newtonian fluid, and the rheological properties of the non-Newtonian fluid are mainly reflected in the viscosity. The viscosity of Newtonian fluid can be characterized by a single viscosity coefficient, while for non-Newtonian fluid the viscosity varies with shear stress and shear stress. The rheological properties of the mud stream refer to the relationship between shear stress and shear rate when subjected to shear deformation as defined by the viscosity of a Newtonian fluid. The function of the viscosity µ of a non-Newtonian fluid: $$\mathrm{\mu }=\text{f}\left[\mathrm{\tau },\frac{\text{you}}{\text{dy}}\right]$$

where τ is the shear stress and $\frac{\text{you}}{\text{dy}}$

is the shear rate.

variiert, wird als Bingham-Fluid bezeichnet. Zahlreiche Versuche haben gezeigt, dass die rheologischen Verhältnisse der Sedimentsuspensionen höherer Konzentrationen den Bingham-Fluideigenschaften unterworfen sind. Deshalb steht ein viskoses Schlammlawinen-Fluid, bei dem die Feststoffe durch den Boden dominiert werden, daher im Einklang mit dem Bingham-Fluid-Modell, und die Beziehung zwischen der Scherspannung und der Scherrate ausgedrückt werden als: $$\mathrm{\tau =}{\mathrm{\tau }}_{\text{y}}+\mathrm{\mu }\left(\frac{\text{du}}{\text{dy}}\right)$$

When the shear stress τ exceeds a certain critical value, shear strain occurs first, and the fluid whose shear stress increases linearly with the rate of shear strain $\frac{\text{you}}{\text{dy}}$

varies, is called Bingham fluid. Numerous experiments have shown that the rheological conditions of the sediment suspensions of higher concentrations are subject to the Bingham fluid properties. Therefore, a viscous mudslide fluid, where the solids are dominated by the soil, is therefore consistent with the Bingham fluid model, and the relationship between shear stress and shear rate can be expressed as: $$\mathrm{\tau =}{\mathrm{\tau }}_{\text{y}}+\mathrm{\mu }\left(\frac{\text{you}}{\text{dy}}\right)$$

In the formula, τ is the shear stress, τ _y is the yield stress or ultimate shear stress, and µ is the viscosity of the Bingham fluid. Flow occurs when the fluid is subjected to a shear stress greater than Bingham's ultimate shear stress.

From the formula (2), it can be seen that the Bingham fluid is viscoplastic and the Bingham fluid model consists of a damper and a viscous Newton pot connected in parallel. As in 2 shown a model for initiating the mud flow.

The mudstream material simulation module is used to perform the combinatorial design of mudstream material properties by simulating a gradation ratio of artificial particles. The mudstream material can be simulated using a grading ratio of artificial particles, including physical properties such as weight and viscosity, with both mudstream layer thickness and topographical slope available as parameters.

The simulation experiment module is used to perform an experiment for mud flow initiation through the Bingham fluid mathematical model domain and obtain the parameter combination that causes the mud flow initiation; wherein a test for mechanical properties is performed on the mudstream material under the set water content, wherein the quantitative relationship between the mudstream water content and the parameters of the parameter combination is established; wherein the values of the parameters of the parameter combination are changed by controlling the water content of the mud flow material, wherein the combined parameter controlled initiation conditions of a mud flow caused by heavy rainfall are obtained by comparing the stress distribution difference of the mud flow sliding.

Bingham fluid is used to simulate the flow of the mud flow, the initiation of the mud flow being derived by coupling the physical field of the solid and the physical field of the fluid in both directions, obtaining the combination of parameters that causes the initiation of the mud flow , includes: the density, the plastic viscosity, the yield stress and the model parameters of the mud flow. By controlling the water content of the mud flow material and changing the value of the parameters in the parameter combination, it is possible to visually simulate whether the mud flow is triggered and to simulate the dynamic flow after the trigger and the termination process.

The test for mechanical properties on the mud flow material under the set water content involves experimentally simulating various natural precipitations with different precipitation intensities such as heavy rainfall or the like, and establishing the quantitative relationship between the water content of the mud flow and the parameters of the parameter combination.

The simulation experiment module changes the density, plastic viscosity, yield stress and model parameters of the mud flow by the water content of the mud flow, and compares the difference in the stress distribution of the mud flow sliding, and obtains the triggering conditions of the mud flow in heavy rainfall controlled by combined parameters, and visualizes the triggering process.

Through the simulation experiment module, it is shown in the experiment process that the Bingham fluid controls the initiation and displacement of the mud flow through the density, plastic viscosity, yield stress and model parameters of the mud flow, and not through the soil moisture content threshold in the usual sense , and the parameter combinations are in a non-linear relationship.

The parameter combination identification module is used to identify heavy rainfall mud flow through the fluid model module according to rainfall intensity and properties based on the combined parameter controlled trigger conditions of the mud flow material to identify whether the mud flow is triggered.

The quantitative relationship between the water content and 4 parameters in the parameter combination can be given by a special instrument (rheometer) through tests at a given precipitation intensity and soil material, thereby opening the channel between the precipitation intensity and the Bingham Fluid Model early warning and parameter processing for the model budget is provided. The detection and early warning process of the device for detecting the combined parameter-controlled triggering conditions of a mudflow caused by heavy rainfall is as follows: the actual gestation body of the disaster is expressed by the model, the rainfall intensity is indicated by the weather forecast, and the mechanical values of the 4th Parameters (density, model parameters, yield stress and plastic viscosity) in the combination of parameters corresponding to the precipitation intensities are adjusted, and through the fluid model module according to different precipitation intensities, a visual process can be simulated to determine whether the mud flow occurs or not.

The above-mentioned embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the above-mentioned embodiments, and all other changes, modifications, substitutions, combinations and simplifications that do not depart from the spirit and principle of the present utility model, are all equivalent substitute modes and are included within the scope of this utility model.

Claims (6)

Apparatus for detecting the combined parameter controlled initiation conditions of a heavy rainfall mud flow, characterized in that the apparatus comprises a fluid model module, a mud flow material simulation module, a simulation experiment module and a parameter combination identification module, the fluid model module being used to identify the mathematical Bingham fluid model domain according to to abstract and generalize the physical mudflow model domain; wherein the mudstream material simulation module is used to perform combinatorial design of mudstream material properties by simulating a gradation ratio of artificial particles; wherein the simulation experiment module is used to perform an experiment for mud flow initiation through the Bingham fluid mathematical model domain and obtain the parameter combination that causes mud flow initiation; wherein a test for mechanical properties is performed on the mudstream material under the set water content, wherein the quantitative relationship between the mudstream water content and the parameters of the parameter combination is established; wherein the values of the parameters of the parameter combination are changed by controlling the water content of the mud flow material, wherein the combined parameter controlled initiation conditions of a mud flow caused by heavy rainfall are obtained by comparing the stress distribution difference of the mud flow sliding; wherein the parameter combination identification module is used to identify whether the mud flow is triggered based on the combined parameter controlled triggering conditions of a heavy rainfall mud flow through the fluid model module according to the precipitation intensity and the properties of the mud flow material. Device for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters according to claim 1 characterized in that the mudstream material is simulated using a grading ratio of artificial particles including weight, viscosity, mudstream layer thickness and topographical slope. Device for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters according to claim 1 , characterized in that the simulation experiment module is used to perform an experiment for initiating the mud flow through the mathematical Bingham fluid model domain, comprising using Bingham fluid to simulate the flow of the mud flow, wherein the initiation of the mud flow is performed by coupling the physical field of the solid body and the physical field of the fluid is derived in both directions. Device for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters according to claim 3 , characterized in that the combination of parameters causing the initiation of the mud flow includes: the density, the plastic viscosity ity, the yield stress and the model parameters of the mud flow. Device for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters according to claim 4 , characterized in that the model parameters include fluid shear stress, fluid ultimate shear stress and fluid viscosity. Device for detecting the triggering conditions of a mud flow caused by heavy rainfall controlled by combined parameters according to claim 3 , characterized in that the test for mechanical properties on the mud flow material under the adjusted water content comprises the experimental simulation of various natural precipitations with different precipitation intensities and establishing the quantitative relationship between the water content of the mud flow and the parameters of the parameter combination.

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