阅读说明：本技术 一种监测滑坡滑动速度和滑动位移的方法 (Method for monitoring sliding speed and sliding displacement of landslide ) 是由 贾艳昌 方东敏 姜彤 宋红克 于 2019-09-04 设计创作，主要内容包括：一种监测滑坡滑动速度和滑动位移的方法,包括以下步骤：在滑坡体上埋设绝缘导线,绝缘导线平直且垂直于滑坡体滑动方向,将滑坡体底部的绝缘导线通过柔性电缆连接至滑坡体顶部并接入电流表后与绝缘导线形成闭合线路,数据采集设备通过数据线连接至电流表,数据采集设备高频采集电流表电流信号；测量滑坡体上磁场强度B,磁感线与滑坡坡面法线水平向夹角<Image he="15" wi="10" file="DEST_PATH_IMAGE002.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>和垂直向夹角β,绝缘导线长度L,测量闭合线路的电阻R,设置数据采集设备采集频率f；当滑坡体滑动时,绝缘导线切割地球磁感线,绝缘导线产生电流,数据采集设备记录电流表<Image he="17" wi="13" file="DEST_PATH_IMAGE004.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>时刻监测电流为<Image he="18" wi="9" file="DEST_PATH_IMAGE006.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>,根据电流<Image he="18" wi="9" file="328152DEST_PATH_IMAGE006.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>随时间<Image he="17" wi="12" file="44960DEST_PATH_IMAGE004.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>变化值积分计算滑坡体滑动速度与滑动位移。(A method of monitoring landslide slip speed and slip displacement comprising the steps of: embedding an insulated wire on a landslide body, wherein the insulated wire is straight and vertical to the sliding direction of the landslide body, the insulated wire at the bottom of the landslide body is connected to the top of the landslide body through a flexible cable and is connected into an ammeter to form a closed circuit with the insulated wire, a data acquisition device is connected to the ammeter through a data wire, and the data acquisition device acquires an ammeter current signal in a high frequency; measuring the magnetic field intensity B on the landslide body, and the horizontal included angle between the magnetic induction line and the normal of the landslide slope surface Angle beta from vertical direction, length of insulated wireMeasuring the resistance R of the closed circuit, and setting the acquisition frequency f of the data acquisition equipment; when the sliding body slides, the earth magnetic induction wire is cut by the insulated wire, the insulated wire generates current, and the data acquisition equipment records the ammeter Constantly monitoring the current as According to the current Over time And calculating the sliding speed and the sliding displacement of the sliding mass by integrating the variation values.)

1. A method of monitoring the sliding speed and displacement of a landslide, comprising: the method comprises the following steps:

a. installing a monitoring device: an insulated wire is buried in a landslide body, the insulated wire is straight and perpendicular to the sliding direction of the landslide body, the insulated wire at the bottom of the landslide body is connected to the top of the landslide body through a flexible cable and is connected into an nA ammeter to form a closed circuit with the insulated wire, a data acquisition device is connected to the nA ammeter through a data line, and the data acquisition device acquires an ammeter current signal in a high frequency;

b. measuring the magnetic field intensity B on the landslide body, the horizontal included angle theta and the vertical included angle beta between the magnetic induction line and the normal line of the landslide slope surface, the length L of the insulated wire, measuring the resistance R of the closed line, and setting the acquisition frequency f of data acquisition equipment;

c. when the landslide body slides, the earth magnetic induction line is cut by the insulated conducting wire, the insulated conducting wire generates current, and the data acquisition equipment records the ammeter t_iConstantly monitoring the current as I_iAccording to the current I_iOver time t_iAnd calculating the sliding speed and the sliding displacement of the sliding mass by integrating the variation values.

2. The method of monitoring landslide slip speed and slip displacement of claim 1, wherein: and a data acquisition device in the step a is a survey station type data acquisition instrument terminal.

3. The method of monitoring landslide slip speed and slip displacement of claim 1, wherein: and (b) in the step a, the measuring range of the nA ammeter is 0-20 nA, and the error is less than 2%.

4. The magnetic induction line of claim 1, wherein the angle θ between the magnetic induction line and the normal of the landslide slope is horizontal and the angle β between the magnetic induction line and the normal of the landslide slope is vertical, and the angle β is characterized in that: and c, in the step b, the horizontal included angle theta and the vertical included angle beta of the magnetic induction line and the normal of the landslide slope surface are both larger than 0 degree and smaller than 90 degrees.

5. The method of monitoring landslide slip speed and slip displacement of claim 1, wherein: and c, calculating the sliding speed and the sliding displacement of the sliding mass as follows:

according to Faraday's law of electromagnetic induction, at t_iTime of day current I in the conductor_i＝BLV_icos θ cos β/R at t_iSliding speed V of landslide along slope surface direction at moment_vi＝I_iR/BLcosθcosβ(i＝1,2,3…n)

The accumulated sliding displacement of the landslide along the slope surface direction is as follows:

b-magnetic field strength, ampere/meter;

burying the length of the lead in the L-landslide body by meters;

r-resistance of closed circuit, ohm;

the vertical included angle between the beta-magnetic induction line and the normal of the landslide slope surface is measured;

f-data acquisition equipment acquires frequency and Hertz;

f-data acquisition equipment acquires frequency and Hertz;

V_viat t_iThe sliding speed of the landslide in the vertical direction at the moment is meter/day;

S_Sat t_iAt the moment, the landslide is accumulated with sliding displacement along the slope surface direction, namely, rice.

Technical Field

The invention belongs to the field of landslide hazard monitoring, and particularly relates to a method for monitoring landslide sliding speed and sliding displacement, in particular to a method for calculating the landslide sliding speed and the sliding displacement according to current generated by a lead pre-embedded in a landslide body when the landslide slides.

Background

At present, various landslide sliding speed and sliding displacement monitoring and early warning methods exist at home and abroad, but a method for calculating the landslide sliding speed and the sliding displacement based on the current generated by a wire pre-embedded in a landslide body when the landslide slides has not been reported.

China is a mountainous area, and in addition to the development of highways, railways and hydroelectric engineering in recent decades, natural or artificial high and steep slopes are more and more, and under the influence of natural or artificial factors such as rainfall, earthquakes and the like, landslide frequently occurs to cause life and property loss events, thereby seriously threatening the life and property safety of people.

The landslide deformation displacement and deformation speed monitoring method mainly comprises a GNSS monitoring method, a radar interference monitoring method, a drilling inclinometer monitoring method, a three-dimensional laser scanning monitoring method, a group measurement group defense method and the like.

Disclosure of Invention

The speed of landslide and the displacement of landslide are key indexes for judging the stability of landslide, so the conventional landslide monitoring method mostly monitors the speed of landslide and the displacement of landslide. However, the existing GNSS monitoring method, radar interference monitoring method, borehole inclinometer monitoring method and three-dimensional laser scanning monitoring method are all monitoring methods with extremely high cost, and are difficult to popularize in a large range. The group testing and group defense method depends on the judgment of personnel experience and lacks reliability.

The invention aims to provide a method for monitoring the sliding speed and the sliding displacement of a landslide, which is a method for calculating the sliding speed and the sliding displacement of the landslide based on the current generated when a lead pre-embedded in a landslide body slides. The invention has the characteristics of high signal acquisition precision, low cost, simple and convenient installation and strong applicability.

The object of the invention is achieved in the following way:

a method of monitoring landslide slip speed and slip displacement comprising the steps of:

a. installing a monitoring device: an insulated wire is buried in a landslide body, the insulated wire is straight and perpendicular to the sliding direction of the landslide body, the insulated wire at the bottom of the landslide body is connected to the top of the landslide body through a flexible cable and is connected into an nA ammeter to form a closed circuit with the insulated wire, a data acquisition device is connected to the nA ammeter through a data line, and the data acquisition device acquires an ammeter current signal in a high frequency;

b. measuring the magnetic field intensity B on the landslide body, the horizontal included angle theta and the vertical included angle beta between the magnetic induction line and the normal line of the landslide slope surface, the length L of the insulated wire, measuring the resistance R of the closed line, and setting the acquisition frequency f of data acquisition equipment;

c. when the landslide body slides, the earth magnetic induction line is cut by the insulated conducting wire, the insulated conducting wire generates current, and the data acquisition equipment records the ammeter t_iConstantly monitoring the current as I_iAccording to the current I_iOver time t_iAnd calculating the sliding speed and the sliding displacement of the sliding mass by integrating the variation values.

In the method for monitoring the sliding speed and the sliding displacement of the landslide, the data acquisition equipment in the step a is a survey station type data acquisition instrument terminal. The sensor can collect RS-232 data interface, the collection frequency can reach 800 Hz at most, and the ultimate working temperature is-30-80 ℃.

According to the method for monitoring the sliding speed and the sliding displacement of the landslide, the measuring range of the nA ammeter in the step a is 0-20 nA, and the error is less than 2%.

And c, forming a horizontal included angle theta and a vertical included angle beta between the magnetic induction line and the normal of the landslide slope surface, wherein the horizontal included angle theta and the vertical included angle beta between the magnetic induction line and the normal of the landslide slope surface in the step b are both larger than 0 degree and smaller than 90 degrees.

In the method for monitoring the sliding speed and the sliding displacement of the landslide, the sliding speed and the sliding displacement of the landslide body are calculated in the step c as follows:

according to Faraday's law of electromagnetic induction, at t_iTime of day current I in the conductor_i＝BLV_i cosθcosβ/R

At t_iSliding speed V of landslide along slope surface direction at moment_vi＝I_iR/BLcosθcosβ(i＝1,2,3…n)

The accumulated sliding displacement of the landslide along the slope surface direction is as follows:

b-magnetic field strength, ampere/meter;

burying the length of the lead in the L-landslide body by meters;

r-resistance of closed circuit, ohm;

the vertical included angle between the beta-magnetic induction line and the normal of the landslide slope surface is measured;

f-data acquisition equipment acquires frequency and Hertz;

f-data acquisition equipment acquires frequency and Hertz;

V_viat t_iThe sliding speed of the landslide in the vertical direction at the moment is meter/day;

S_Sat t_iAt the moment, the landslide is accumulated with sliding displacement along the slope surface direction, namely, rice.

Compared with the prior art, the method has the following advantages:

the method calculates the sliding speed and the sliding displacement of the landslide based on the current generated by the pre-buried wires in the landslide body when the landslide slides, and has the characteristics of high signal acquisition precision, low cost, simple and convenient installation and strong applicability.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

Detailed Description

The nA ammeter of the invention adopts a 285 nanoampere ammeter manufactured by MONROE company in America, the measurement range is 0-20 nA, and the resolution ratio is as follows: the precision of 0.01nA is better than that of: plus or minus 2 percent; the resistance meter for measuring the resistance selects a common multimeter to measure the system resistance; the magnetic meter of the magnetic field intensity adopts the model of Beijing HengOde instruments and meters company Limited: h17565 earth magnetic field survey meter, the precision is superior to: 0.5% F.S, sensitivity 1 nT; the data acquisition equipment adopts a station-measuring type data acquisition instrument terminal of ADT-M100S model of Beijing Ke' an Di science and technology development Limited company to acquire the current data of the ammeter.