CN-121997532-A - Method and device for predicting critical instability time of unloading rock mass based on zhai rattan method

CN121997532ACN 121997532 ACN121997532 ACN 121997532ACN-121997532-A

Abstract

The application belongs to the technical field of data processing, and discloses a method and a device for predicting critical instability time of an unloading rock mass based on a rattan method, wherein the method comprises the steps of obtaining a rock mass creep deformation monitoring range and obtaining accelerated creep stage data; the method comprises the steps of obtaining rock mass creep instability damage time, a first difference value and a second difference value under excavation unloading conditions according to data processing in an accelerated creep stage, obtaining a numerical table according to the first difference value, the second difference value and the rock mass creep instability damage time, obtaining field monitoring data, and obtaining field instability damage time according to the field monitoring data and the numerical table. The method can effectively predict the creep deformation damage of the unloading rock mass of underground engineering, side slope and the like, indirectly reduces the consequences caused by the instability damage of the unloading rock mass, and ensures the smooth construction of the whole underground engineering and the excavation side slope engineering.

Inventors

Huang Houzan
LIU ZHIFANG
LIANG ZHU
HUANG JIAMING
XU GUANGPING
ZHANG PENG

Assignees

广州市城市规划勘测设计研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20251210

Claims (10)

1. An unloading rock mass critical instability time prediction method based on a zhai rattan method, which is characterized by comprising the following steps: Acquiring a rock mass creep deformation monitoring range, and obtaining data of an acceleration creep stage; Obtaining rock mass creep instability failure time, a first difference value and a second difference value under excavation unloading conditions according to the data processing of the accelerated creep stage; Processing according to the first difference value, the second difference value and the rock mass creep instability damage time to obtain a numerical table; And acquiring field monitoring data, and obtaining the field instability destruction time according to the field monitoring data and the numerical table.
2. The method for predicting critical destabilizing time of unloading rock mass based on rattan according to claim 1, characterized in that the rock mass creep deformation monitoring range includes potential sliding belt, main sliding section, trailing edge pull crack, top of slope platform and toe.
3. The method for predicting critical destabilizing time of unloading rock mass based on rattan according to claim 2, characterized in that the accelerated creep stage data includes an initial time point, a first time point, a second time point, a change time and an instantaneous deformation rate.
4. The method for predicting critical destabilizing time of unloading rock mass based on zhai rattan according to claim 3, characterized in that the method further comprises: Obtaining a displacement-time curve according to the on-site monitoring data; and determining an initial moment point for entering an acceleration stage according to the displacement-time curve.
5. The method for predicting critical destabilization time of unloading rock mass based on zhai rattan according to claim 4, further comprising: obtaining displacement variation and total number of monitoring points of each monitoring point in the stable deformation stage in the variation time according to the on-site monitoring data; and calculating according to the displacement variation of each monitoring point in the stable deformation stage in the variation time and the total number of the monitoring points to obtain the instantaneous deformation rate.
6. The method for predicting critical destabilization time of unloading rock mass based on zhai rattan according to claim 5, further comprising: Carrying out derivative calculation on the rattan formula twice to obtain creep deformation acceleration under the non-unloading stress condition; Multiplying the creep deformation acceleration under the unloading stress condition according to a preset constant and the creep deformation acceleration under the non-unloading stress condition to obtain the creep deformation acceleration under the unloading stress condition; And integrating the creep deformation acceleration under the unloading stress condition to obtain a relational expression of the creep deformation rate and the destruction time of the rock mass under the unloading condition.
7. The method for predicting critical destabilization time of unloading rock mass based on zhai rattan according to claim 6, further comprising: And calculating according to the relation between the creep deformation rate and the destruction time of the rock mass under the conditions of the first moment, the second moment and the unloading, so as to obtain the deformation amount in the time from the time when the change time passes after the initial moment of the accelerated creep deformation stage reaches the first moment, the deformation amount in the time when the change time passes after the first moment reaches the second moment, and the creep instability destruction time of the rock mass from the initial moment of the accelerated creep deformation stage to the unloading.
8. An unloading rock mass critical destabilization time prediction device based on a zhai rattan method, characterized in that the device comprises: the acquisition module is used for acquiring a rock mass creep deformation monitoring range and obtaining data of an acceleration creep stage; The calculation module is used for obtaining the rock mass creep instability destruction time, the first difference value and the second difference value under the excavation unloading condition according to the data processing of the accelerated creep stage; the processing module is used for processing the first difference value, the second difference value and the rock mass creep instability destruction time to obtain a numerical table; the prediction module is used for acquiring field monitoring data and obtaining the field instability destruction time according to the field monitoring data and the numerical table.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for predicting critical destabilizing time of unloading rock mass based on the zhai rattan method according to any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method for predicting critical destabilizing time of an unloading rock mass based on the zhai rattan method according to any one of claims 1 to 7.

Description

Method and device for predicting critical instability time of unloading rock mass based on zhai rattan method Technical Field The application relates to the technical field of data processing, in particular to a method and a device for predicting critical instability time of an unloading rock mass based on a zhai rattan method. Background After excavation and unloading of underground engineering, side slopes and the like, the rock mass cannot be immediately instable and damaged, creep deformation is shown, and is one of important mechanical properties of the unloading rock mass, so that all excavation and unloading engineering is closely related to the creep properties of the unloading rock mass. The existing underground engineering and artificial excavation slope such as rail transit, highway tunnel and deep sea tunnel is huge in quantity, rock mass is not immediately unstable and damaged after excavation and unloading, creep deformation instability and damage or collapse can possibly occur along with the time, surrounding rocks have obvious characteristics of slow deformation along with the time, particularly a cavity buried underground is extremely obvious in creep deformation, and the deformation quantity is much larger than the instantaneous deformation quantity. The stability of unloading rock mass such as underground engineering and excavation slope is very important to the stability of the whole engineering, so that the prediction of the creep instability damage time point of the rock mass under the unloading condition is also very important. At present, a lot of research is carried out on non-unloading rock mass landslide prediction and forecasting techniques, mainly including a rattan method, a gray prediction model, a Fukuzono model, a Verhulst model, a BP neural network model, a fuzzy analysis method, a collaborative prediction model and the like, and various types of landslide can be accurately predicted by the theory, but the method is not suitable for the rock mass creep instability damage prediction under the unloading condition. The deformation mechanism of the unloading rock mass is researched in many ways at home and abroad, but the creep prediction technical means of the unloading rock mass are less, so that a simple technology is needed to predict the creep instability damage condition of the unloading rock mass in underground engineering, side slopes and the like. Disclosure of Invention The application provides a method and a device for predicting critical instability time of an unloading rock mass based on a rattan method, which can obtain the creep instability damage time, a first difference value and a second difference value of the rock mass under the condition of excavation unloading according to the monitoring range of creep deformation of the rock mass and data of an accelerated creep stage, and further obtain a numerical table, so that the field instability damage time can be obtained by comparing the current field monitoring data with the obtained numerical table, the creep deformation damage of the unloading rock mass such as underground engineering, side slope and the like can be effectively predicted, the consequences caused by the creep deformation damage of the unloading rock mass are indirectly reduced, and the smooth construction of the whole underground engineering and the excavation side slope engineering is ensured. In a first aspect, an embodiment of the present application provides a method for predicting critical instability time of an unloading rock mass based on a zhai rattan method, where the method includes: Acquiring a rock mass creep deformation monitoring range, and obtaining data of an acceleration creep stage; obtaining rock mass creep instability failure time, a first difference value and a second difference value under excavation unloading conditions according to data processing of an accelerated creep stage; processing according to the first difference value, the second difference value and the rock mass creep instability destruction time to obtain a numerical table; And acquiring field monitoring data, and obtaining the field instability destruction time according to the field monitoring data and the numerical table. Further, the monitoring range of the creep deformation of the rock mass comprises a potential sliding belt, a main sliding section, a rear edge pull crack, a slope top platform and a slope toe. Further, the accelerated creep phase data includes an initial time point, a first time point, a second time point, a change time, and an instantaneous deformation rate. Further, the method further comprises: Obtaining a displacement-time curve according to the on-site monitoring data; The initial point of time for entering the acceleration phase is determined from the displacement-time curve. Further, the method further comprises: obtaining displacement variation and total number of monitoring points of each monitoring point in the stable deformat