CN105652035A - Landslide monitoring method utilizing piezoelectricity acceleration sensor - Google Patents
Landslide monitoring method utilizing piezoelectricity acceleration sensor Download PDFInfo
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- CN105652035A CN105652035A CN201610152780.0A CN201610152780A CN105652035A CN 105652035 A CN105652035 A CN 105652035A CN 201610152780 A CN201610152780 A CN 201610152780A CN 105652035 A CN105652035 A CN 105652035A
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- 230000001133 acceleration Effects 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 230000006698 induction Effects 0.000 claims description 14
- 239000011435 rock Substances 0.000 claims description 4
- 239000008267 milk Substances 0.000 claims description 3
- 210000004080 milk Anatomy 0.000 claims description 3
- 235000013336 milk Nutrition 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/10—Alarms for ensuring the safety of persons responsive to calamitous events, e.g. tornados or earthquakes
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Emergency Alarm Devices (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a landslide monitoring method utilizing a piezoelectricity acceleration sensor. The method comprises the following steps that 1, the piezoelectricity acceleration sensor is arranged; 2, a slope sliding acceleration a is obtained through the formula Q=d<33>Ma according to a measured electric charge Q of the piezoelectricity acceleration sensor; 3, the stage which slope sliding belongs to is judged according to four accelerating stages of slope deformation, and when the acceleration a is suddenly increased and reaches a preset value, alarm is started. The landslide monitoring method utilizing the piezoelectricity acceleration sensor has the advantages that directly relevant acceleration data capable of being quantitatively detected is provided for landslide prediction, and accurate alarm is achieved.
Description
Technical field
The invention belongs to geologic hazard Control Technology field, it is specifically related to a kind of landslide monitoring method.
Background technology
Man of Shi Yigeduo mountain country of China, mountain region disaster frequently occurs, and to the development of the national economy, particularly mountain area economy development causes serious impact. It is estimated that every year because of the direct economic loss about 20,000,000,000 yuans that the disasters such as avalanche, landslide, rubble flow cause, indirect loss is difficult to estimate especially. Landslide disaster has become the second largest geologic hazard being only second to earthquake. Strangle landslide, mountain from famous spilling on March 7 nineteen eighty-three and seize the life of 227 people, come down based on reaching the monitoring more than 9 years and successful predicting to Yangtze River Gorges Xin Tanzhen in 1985, it is ensured that the life security of 1371 people on town. Thus both illustrated that the harm of landslide disaster was serious, shown again the important, feasible of Prediction and Forecast of Landslide.
Although starting late in domestic aspect, but the experience accumulation through more than 10 years also achieves some achievements. The domestic means for landslide monitoring mainly contain macroscopic view matter monitoring method, the earth precision measurement etc. simply at present. Macroscopic view simply matter monitoring method namely to crack, ground, spring dynamically, crack, house etc. carry out periodic observation, understand the residing state in landslide. Although the information that the method obtains is directly perceived, method simple, but there is the shortcomings such as precision is lower, manpower and materials input is excessive. Namely the earth precision measurement adopts high precision measuring instrument, such as spirit-leveling instrument, tiltmeter, total powerstation etc., the observation landslide distortion of each point, misalignment, the precision height of the method, but shortcoming be subject to the restriction of topographical condition and meteorological conditions, workload is big, the cycle is long.
At present, domestic landslide monitoring parameter mainly comes down the displacement of movement, direction and speed. Big quantity research shows, landslide enters accelerates the prerequisite that deformation stage is generation landslide disaster, and the stability come down and its deformation stage have and directly contact, the deformation evolution stage accurately holding landslide is the basis carrying out Landslide Stability evaluation and Prediction and Forecast of Landslide. Landslide can be divided into three phases by the change according to acceleration: the initial deformation stage, constant speed deformation stage, accelerate deformation stage, and landslide failure occur in accelerate deformation stage face sliding period. If can accurate measurements to the acceleration change of Landslide Deformation, forecast landslide disaster is had great significance.
Chinese patent literature CN102509420B discloses a kind of slide prediction method based on facing skating area deformation information on January 1st, 2014, the method is according to the creep rule of field monitoring data and landslide disaster and mechanism, propose and close on landslide but non-landing position (facing skating area) side slope creep curve and distortion development four-stage, derive and faced skating area slope deforming, speed, accelerating curve equation and based on the slide prediction time model facing skating area deformation information, and establish based on the parameter of the Verhulst grey model facing skating area deformation information to determine in this slide prediction time model. there is following problem in the method: 1, the method is surveyed data is surface displacement, it does not have test landslide depth data, 2, the index parameter of the method slide prediction is obtained by Equation for Calculating, there is certain error with actual parameter.
Summary of the invention
For existing landslide catastrophe monitoring method Problems existing, the technical problem to be solved in the present invention is just to provide a kind of landslide monitoring method utilizing piezoelectric acceleration sensor, its parameter using the acceleration that slides as landslide monitoring, can provide quantitative data for slide prediction, it is achieved accurately report to the police.
Technical problem to be solved by this invention is realized by such technical scheme, and it includes following step:
Step 1, be perpendicular on side slope main sliding direction at each monitoring point place boring, piezoelectric acceleration sensor is inserted in hole, and be fixed on landslide basement rock on, output line is drawn and is in the milk and boring is sealed;
The charge Q of the piezoelectric acceleration sensor that step 2, foundation record, by Q=d33Ma obtains slope sliding acceleration a, wherein, and d33For piezoelectric constant, M is the quality of piezoelectric acceleration sensor;
Step 3, acceleration four-stage according to slope deforming:
First stage is the initial deformation stage, and acceleration is less than again 0 after being greater than 0 before this;
Subordinate phase is constant speed deformation stage, and acceleration equals 0 or fluctuate about 0 substantially;
Phase III, acceleration started to be greater than 0 in order to accelerate deformation stage;
Fourth stage is for facing the sliding stage, and acceleration increases suddenly;
Judge the stage residing for slope sliding, when acceleration a occurs suddenly increasing and reaches preset value, start early warning.
The present invention obtains slope sliding acceleration a by piezoelectric acceleration sensor, the state residing for slope sliding is determined according to slip acceleration a, and report to the police, for slide prediction provides acceleration information directly related, energy detection by quantitative, overcome and prior art uses and the landslide false judgment that directly parameter does not cause, it is achieved that accurately report to the police.
So, the present invention has following advantage: provide acceleration information directly related, energy detection by quantitative to slide prediction, it is achieved that accurately report to the police.
Accompanying drawing explanation
The accompanying drawing of the present invention is described as follows:
Fig. 1 is the piezoelectric acceleration sensor construction schematic diagram of the present invention;
Fig. 2 is the change state figure of slip acceleration.
In figure: 1. susceptor plate; 2. piezoelectric acceleration induction element; 3. through slot; 4. output line.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described:
As shown in Figure 1, piezoelectric acceleration sensor comprises susceptor plate 1 and piezoelectric acceleration induction element 2, multiple piezoelectric acceleration induction element 2 is fixed on susceptor plate 1, and longitudinal side of susceptor plate 1 has through slot 3, and the output line 4 of piezoelectric acceleration induction element 2 is drawn from through slot 3.
The present invention comprises the following steps:
Step 1, be perpendicular on side slope main sliding direction at each monitoring point place boring, piezoelectric acceleration sensor is inserted in hole, and be fixed on landslide basement rock on, output line is drawn and is in the milk and boring is sealed;
Step 2, detection slope sliding acceleration a
Assuming that the susceptor plate quality of piezoelectric acceleration sensor is M, the quality of piezoelectric acceleration induction element is m, then according to Newton's second law, and can trying to achieve by following formula by power F of piezoelectric acceleration sensor:
F=(M+m) a
Wherein a is the acceleration of detection side slope.
According to upper formula, it can be appreciated that the power on piezoelectric acceleration induction component thickness direction (Z-direction) arbitrary cross section is
F=Ma+ma (1-z/d)
Wherein z is the thickness in arbitrary cross section, and d is the thickness of piezoelectric acceleration induction element. So mean force is
Because the direction of polarization of piezoelectric acceleration induction element is in thickness direction (Z-direction), reactive force along the Z direction, so the mean value of applied stress of now piezoelectric acceleration induction element is
Wherein A is piezoelectric acceleration induction element electrode face area.
According to piezoelectricity matrix, it can be appreciated that charge Q is
In formula, d33It it is piezoelectric constant.
And piezoelectric acceleration induction element is generally a very thin wafer, susceptor plate generally adopts the metal that quality is big to make, so M is much larger than m, so m can ignore, namely
Q=d33Ma
Relation between the charge Q produced by the known piezoelectric acceleration sensor of upper formula and acceleration a is directly proportional, and just can obtain slope sliding acceleration a according to measurement electric charge.
Step 3, basis " there is the acceleration change feature on creep feature landslide and face the research of sliding warning index ", Xu Qiang, Chinese Journal of Rock Mechanics and Engineering, 28th volume the 6th phase, 1099th��1106 pages, describe the landslide with creep feature in June, 2009 to start to whole slide from distortion and destroy this process and generally to be experienced initial deformation, constant speed distortion and accelerate 3 stages of distortion, and the deformation characteristics that different steps has them different, thus it is subdivided into different sub-phase.
As shown in Figure 2, the acceleration of slope deforming divides four-stage
First stage is the initial deformation stage, and acceleration is less than again 0 after being greater than 0 before this;
Subordinate phase is constant speed deformation stage, and acceleration equals 0 or fluctuate about 0 substantially;
Phase III, acceleration started to be greater than 0 in order to accelerate deformation stage;
Fourth stage is for facing the sliding stage, and acceleration increases suddenly;
Judge the stage residing for slope sliding, when acceleration a occurs suddenly increasing and reaches preset value, start early warning.
The output line of piezoelectric acceleration sensor can be connected to data collecting system by the present invention, by the data gathering that piezoelectric acceleration sensor produces, and by GPRS wireless network transmissions to data monitor center after transmodulator. Surveillance center is connected to Internet again; After computer terminal software obtains data from Internet, data being processed, the acceleration information storehouse of foundation and renewal monitoring, converts monitoring index to, and judges Landslide Stability, when acceleration angle value reaches early warning value, shows landslide appearance danger and reports to the police.
Claims (2)
1. utilize a landslide monitoring method for piezoelectric acceleration sensor, it is characterized in that, comprise the following steps:
Step 1, be perpendicular on side slope main sliding direction at each monitoring point place boring, piezoelectric acceleration sensor is inserted in hole, and be fixed on landslide basement rock on, output line is drawn and is in the milk and boring is sealed;
The charge Q of the piezoelectric acceleration sensor that step 2, foundation record, by Q=d33Ma obtains slope sliding acceleration a, wherein, and d33For piezoelectric constant, M is the quality of piezoelectric acceleration sensor;
Step 3, acceleration four-stage according to slope deforming:
First stage is the initial deformation stage, and acceleration is less than again 0 after being greater than 0 before this;
Subordinate phase is constant speed deformation stage, and acceleration equals 0 or fluctuate about 0 substantially;
Phase III, acceleration started to be greater than 0 in order to accelerate deformation stage;
Fourth stage is for facing the sliding stage, and acceleration increases suddenly;
Judge the stage residing for slope sliding, when acceleration a occurs suddenly increasing and reaches preset value, start early warning.
2. landslide monitoring method according to claim 1, it is characterized in that: described piezoelectric acceleration sensor comprises susceptor plate (1) and piezoelectric acceleration induction element (2), multiple piezoelectric acceleration induction element (2) is fixed on susceptor plate (1), longitudinal side of susceptor plate (1) has through slot (3), and the output line (4) of piezoelectric acceleration induction element (2) is drawn from through slot (3).
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| CN201610152780.0A CN105652035A (en) | 2016-03-17 | 2016-03-17 | Landslide monitoring method utilizing piezoelectricity acceleration sensor |
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| CN201610152780.0A CN105652035A (en) | 2016-03-17 | 2016-03-17 | Landslide monitoring method utilizing piezoelectricity acceleration sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109543341A (en) * | 2018-12-11 | 2019-03-29 | 重庆大学 | A kind of prediction side slope faces the power function speed counting backward technique of sliding time |
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| CN101718876A (en) * | 2009-11-13 | 2010-06-02 | 北京科技大学 | Method for monitoring stability and predicting destabilization of side slope based on change of state of strain of soil-rock mass |
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2016
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| CN109543341A (en) * | 2018-12-11 | 2019-03-29 | 重庆大学 | A kind of prediction side slope faces the power function speed counting backward technique of sliding time |
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