CN110333336B - Early warning system and method for monitoring soil slope instability under rainfall condition - Google Patents
Early warning system and method for monitoring soil slope instability under rainfall condition Download PDFInfo
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Abstract
The invention provides an early warning system and method for monitoring soil slope instability under a rainfall condition, and relates to the technical field of construction engineering simulation informatization. The system comprises strain and stress sensors, a soil pressure cell and a computer with a built-in simulation program. The strain and stress sensors and the soil pressure boxes are uniformly distributed in an area which is easy to destabilize and damage and is determined by computer simulation software in advance, and the soil pressure values are monitored and collected in real time when the rainfall duration reaches the dangerous duration. In the monitoring process, a computer is matched with an earth slope instability model established according to field detection results under rainfall conditions, and after the system judges that the dangerous rainfall duration is reached, the stress strain value of an earth slope dangerous area is started to be monitored. The system is composed of two parts which are supplemented by a computer simulation program for analyzing the safety coefficient of the side slope and a system for monitoring the stress strain value of the soil body of the side slope, and is used for predicting the unstable sliding surface of the side slope under the rainfall condition, thereby playing the side slope early warning effect. The landslide hazard early warning system plays a role in early warning landslide disasters under rainfall conditions, and guarantees of life and property safety are provided for people.
Description
Technical Field
The invention relates to the technical field of construction engineering simulation informatization, in particular to an early warning system and method for monitoring soil slope instability under a rainfall condition.
Background
Rainfall has always been an important factor in the destabilization and damage of soil slopes, and slope landslide damage caused by rainfall action accounts for the vast majority of the destabilization disasters of soil slopes. Under the rainfall condition, the landslide is monitored in real time, the landslide time and the landslide position are predicted, people can be helped to predict the arrival of disasters at the first time, and corresponding prevention and control measures can be taken, so that the life and property safety of people is guaranteed.
In the field of geotechnical engineering, the monitoring of soil stability strength is a long-lasting topic for predicting side slope disasters. The shear strength index of the soil body is an important index for researching the stability of the soil body. The shear strength of the soil body refers to the ultimate shear strength exerted by the soil body under an external load. Often, soil instability is caused by the fact that the ultimate shear strength of the soil can no longer balance the shear stress generated by the external force, thereby causing the reduction and even destruction of the soil strength.
In the process of slope stability detection, after the limit shear strength of a slope soil body is calculated based on a Mohr-Coulomb strength theory and a strength reduction method, a Swedish arc method is used for dividing the slope into a limited number of continuous strips, but the Swedish arc method has the big defect that the interaction of the acting forces between the strips is not considered, and the Bishop rule is simplified, so that the problem is effectively avoided.
In practical engineering, researchers often use a direct shear test in a laboratory as a main method for determining the shear strength of a soil body, and the method has many limitations, such as limitation of a soil body damage area and the like.
Disclosure of Invention
The invention aims to solve the technical problem of providing an early warning system and method for monitoring soil slope instability under rainfall conditions, which are used for monitoring soil stress strain values of soil slopes under rainfall conditions in real time and carrying out early warning on the slopes by matching with remote simulation of computer software, so that the life and property safety of people is ensured.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: on one hand, the invention provides an early warning system for monitoring soil slope instability under rainfall conditions, which comprises a strain sensor, a stress sensor, a soil pressure box and a remote computer with a built-in simulation program, wherein the strain sensor and the stress sensor are arranged in a soil body of a side slope; the strain and stress sensors are arranged in an area which is easy to destabilize and damage the soil slope and is judged by a computer simulation program in advance, and the soil pressure value of the soil slope is monitored and collected in real time when the rainfall reaches the dangerous duration; the stress strain sensor and the soil pressure cell are both wirelessly connected with a computer; a simulation program arranged in the computer establishes a soil slope instability model and calculates the safety coefficient of a soil slope sliding surface, so as to determine a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year; meanwhile, landslide danger in dangerous rainfall duration is alarmed through the received stress and strain data and soil pressure data measured by the soil pressure cell.
On the other hand, the invention also provides an early warning method for monitoring soil slope instability under rainfall conditions, which comprises the following steps:
step 1, inputting mechanical parameter indexes of a foundation soil body obtained by engineering geological field investigation and theoretical values required by field collection of soil samples calculated through laboratory detection into geotechnical simulation software through a built-in simulation program by a computer, establishing an earth slope instability model, calculating the safety coefficient of an earth slope sliding surface, and determining a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year;
the mechanical parameter indexes of the foundation soil body comprise the soil body weight of each layer of the side slope, the saturated soil body weight, the cohesive force and the internal friction angle;
the theoretical values required by the field collection of the soil sample comprise permeability coefficient, saturated volume water content, internal friction angle, cohesive force, residual water content and soil body weight;
step 2, simultaneously placing a strain sensor, a stress sensor and a soil pressure cell in the soil body of the determined dangerous landslide area;
step 3, when the rainfall reaches the dangerous duration, the computer starts the strain sensor, the stress sensor and the soil pressure cell, and receives the soil slope dangerous area stress strain value and soil pressure value data detected by the strain sensor, the stress sensor and the soil pressure cell in real time;
and 4, judging whether the stress strain value and the soil pressure value of the soil slope dangerous area exceed a landslide threshold value, if so, sending out an alarm early warning, marking the corresponding position in the established soil slope instability model by using colors, adding a retaining wall at the position of the slope toe of the side slope in time for protection, otherwise, continuously monitoring, judging the received stress strain value and the received soil pressure value, and removing the instability alarm until the stress strain value and the soil pressure value monitored by the side slope are restored to be within a safety value range.
In the invention, the change of the slope volatile and stable dangerous position area and time are jointly pre-judged by a simulation program arranged in a computer and the change of the stress strain value monitored by the soil pressure cell. The simulation program arranged in the computer mainly predicts a slope dangerous area and rainfall duration under the rainfall condition, shortens a working interval for the process of detecting a stress strain numerical value by the soil pressure cell, starts to collect data in real time by the soil pressure cell and the stress strain sensor arranged in the soil slope landslide-prone area after the rainfall process of a slope body enters the dangerous rainfall duration, and judges the unstable landslide condition according to the magnitude of the stress strain value at a corresponding position in a model established by the computer.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the early warning system and the early warning method for monitoring the instability of the soil slope under the rainfall condition, aiming at the characteristic that the slope is easy to slide and is easy to be damaged, a computer built-in simulation program is used for calculating the safety coefficient of the slope and matching with the real-time stress strain acquisition data on site, the dangerous rainfall duration of the soil slope instability dangerous area and the dangerous rainfall duration are jointly pre-judged, double survey and accurate early warning can be carried out more accurately, the slope disaster caused by rainfall can be early warned, the time for pre-prevention and control is won for people, and resources and manpower are saved to a certain extent.
Drawings
Fig. 1 is a block diagram of a system for monitoring soil slope instability early warning under rainfall conditions according to an embodiment of the present invention;
fig. 2 is a flowchart of an early warning method for monitoring soil slope instability under rainfall conditions according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
An early warning system for monitoring soil slope instability under rainfall conditions is shown in figure 1 and comprises a strain sensor, a stress sensor, a soil pressure cell and a remote computer with a built-in simulation program, wherein the strain sensor and the stress sensor are installed in a soil body of a side slope; the strain and stress sensors are arranged in an area which is easy to destabilize and damage the soil slope and is judged by a computer simulation program in advance, and the soil pressure value of the soil slope is monitored and collected in real time when the rainfall reaches the dangerous duration; the stress strain sensor and the soil pressure cell are both wirelessly connected with a computer; a simulation program arranged in the computer establishes a soil slope instability model and calculates the safety coefficient of a soil slope sliding surface, so as to determine a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year; meanwhile, landslide danger in dangerous rainfall duration is alarmed through the received stress and strain data and soil pressure data measured by the soil pressure cell.
An early warning method for monitoring soil slope instability under rainfall conditions is shown in fig. 2 and comprises the following steps:
step 1, inputting mechanical parameter indexes of a foundation soil body obtained by engineering geological field investigation and theoretical values required by field collection of soil samples calculated through laboratory detection into Geo-studio geotechnical simulation software through a built-in simulation program by a computer, establishing a soil slope instability model, calculating the safety coefficient of a soil slope landslide surface, and determining a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year; early warning of disaster occurrence is achieved.
The mechanical parameter indexes of the foundation soil body comprise the soil body weight of each layer of the side slope, the saturated soil body weight, the cohesive force and the internal friction angle;
the theoretical values required by the field collection of the soil sample comprise permeability coefficient, saturated volume water content, internal friction angle, cohesive force, residual water content and soil body weight;
step 2, simultaneously placing a strain sensor, a stress sensor and a soil pressure cell in the soil body of the determined dangerous landslide area;
step 3, when the rainfall reaches the dangerous duration, the computer starts the strain sensor, the stress sensor and the soil pressure cell, and receives the soil slope dangerous area stress strain value and soil pressure value data detected by the strain sensor, the stress sensor and the soil pressure cell in real time;
and 4, judging whether the stress strain value and the soil pressure value of the soil slope dangerous area exceed a landslide threshold value, if so, sending out an alarm early warning, marking the corresponding position in the established soil slope instability model by using colors, adding a retaining wall at the position of the slope toe of the side slope in time for protection, otherwise, continuously monitoring, judging the received stress strain value and the received soil pressure value, and removing the instability alarm until the stress strain value and the soil pressure value monitored by the side slope are restored to be within a safety value range.
In this embodiment, when the stress strain value and the soil pressure value of the dangerous soil slope region exceed the landslide threshold, the corresponding position is marked with yellow in the established unstable soil slope model, and the larger the detected stress strain value of the dangerous slope landslide region soil body is, the darker the color of the corresponding position in the model established by the computer is, the more obvious the color is.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (1)
1. A method for monitoring soil slope instability early warning under rainfall condition is carried out by adopting an early warning system for monitoring soil slope instability under rainfall condition, wherein the system comprises a strain sensor, a stress sensor, a soil pressure box and a remote computer with a built-in simulation program, wherein the strain sensor and the stress sensor are installed in a soil body of a side slope; the strain and stress sensors are arranged in an area which is easy to destabilize and damage the soil slope and is judged by a computer simulation program in advance, and the soil pressure value of the soil slope is monitored and collected in real time when the rainfall reaches the dangerous duration; the stress strain sensor and the soil pressure cell are both wirelessly connected with a computer; a simulation program arranged in the computer establishes a soil slope instability model and calculates the safety coefficient of a soil slope sliding surface, so as to determine a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year; meanwhile, landslide danger in dangerous rainfall duration is alarmed through the received stress and strain data and soil pressure data measured by a soil pressure cell;
the method is characterized in that: the method comprises the following steps:
step 1, inputting mechanical parameter indexes of a foundation soil body obtained by engineering geological field investigation and theoretical values required by field collection of soil samples calculated through laboratory detection into geotechnical simulation software through a built-in simulation program by a computer, establishing an earth slope instability model, calculating the safety coefficient of an earth slope sliding surface, and determining a dangerous landslide area; determining the dangerous rainfall duration according to rainfall intensity data of the slope region in the past year;
step 2, simultaneously placing a strain sensor, a stress sensor and a soil pressure cell in the soil body of the determined dangerous landslide area;
step 3, when the rainfall reaches the dangerous duration, the computer starts the strain sensor, the stress sensor and the soil pressure cell, and receives the soil slope dangerous area stress strain value and soil pressure value data detected by the strain sensor, the stress sensor and the soil pressure cell in real time;
step 4, judging whether the stress strain value and the soil pressure value of the soil slope dangerous area exceed a landslide threshold value, if so, sending out an alarm early warning, marking the corresponding position in the established soil slope instability model by using colors, adding a retaining wall at the position of the slope toe of the side slope in time for protection, otherwise, continuously monitoring, judging the received stress strain value and the received soil pressure value until the stress strain value monitored by the side slope is restored to the safety value range, and removing the instability alarm;
the mechanical parameter indexes of the foundation soil body comprise the soil body weight of each layer of the side slope, the saturated soil body weight, the cohesive force and the internal friction angle;
the theoretical values required by the field collection of the soil sample comprise permeability coefficient, saturated volume water content, internal friction angle, cohesive force, residual water content and soil body gravity.
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| CN110749723A (en) * | 2019-11-05 | 2020-02-04 | 国家电网有限公司 | Physical model test method for high-voltage transmission tower foundation landslide under rainfall effect |
| CN111932832A (en) * | 2020-08-07 | 2020-11-13 | 西南交通大学 | Construction engineering environment disaster accident monitoring and early warning method |
| CN112540165A (en) * | 2020-12-04 | 2021-03-23 | 广东电网有限责任公司 | Water and soil loss early warning system and method |
| CN113096360B (en) * | 2021-04-21 | 2022-09-23 | 贵州大学 | Novel analysis monitoring method for slope fixing monitoring |
| CN113640113B (en) * | 2021-08-03 | 2024-01-12 | 国网福建省电力有限公司电力科学研究院 | Slope stability real-time assessment method |
| CN115063949B (en) * | 2022-06-25 | 2024-03-22 | 深圳市自然资源和不动产评估发展研究中心(深圳市地质环境监测中心) | Karst collapse monitoring and early warning method, system and storage medium based on rainfall data |
| CN116913044A (en) * | 2023-07-17 | 2023-10-20 | 四川农业大学 | Multifunctional slope monitoring and early warning equipment considering matrix suction force |
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| CN104899437B (en) * | 2015-05-29 | 2019-04-02 | 杭州辰青和业科技有限公司 | Heavy rainfall type landslide disaster method for early warning |
| CN105139585B (en) * | 2015-07-29 | 2017-11-07 | 同济大学 | A kind of soil-slope dangerous situation intelligent early-warning forecasting procedure |
| CN105260625B (en) * | 2015-11-19 | 2018-02-23 | 成都理工大学 | A kind of Landslide Hazards early warning method for pushing |
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Application publication date: 20191015 Assignee: Jilin Sanwei Geotechnical Engineering Co.,Ltd. Assignor: Northeastern University Contract record no.: X2023210000300 Denomination of invention: A monitoring and early warning system and method for soil slope instability under rainfall conditions Granted publication date: 20211008 License type: Common License Record date: 20231213 |
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