JPH0762640A - Landslide measurement method and device thereof - Google Patents
Landslide measurement method and device thereofInfo
- Publication number
- JPH0762640A JPH0762640A JP20733893A JP20733893A JPH0762640A JP H0762640 A JPH0762640 A JP H0762640A JP 20733893 A JP20733893 A JP 20733893A JP 20733893 A JP20733893 A JP 20733893A JP H0762640 A JPH0762640 A JP H0762640A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- landslide
- cable
- movement
- sensitive cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、地すべり地帯におい
て使用される地すべり観測方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landslide observation method used in a landslide area.
【０００２】[0002]
【従来の技術】従来、地すべり対策工事を行う場合、地
すべり地帯におけるすべり面の深さ及び移動量を測定す
ることにより、工事の施工箇所やその規模が決定されて
いる。そのために（１）地すべり面の深さを測定する方
法としては、(ａ)パイプ歪計を使用する方法、(ｂ)すべ
り面検知ケーブルを使用する方法、(ｃ)特開平4-95716
号公報に開示されている地すべり面検出方法があり、ま
た（２）すべり面の移動量を測定する方法としては、
(ｄ)伸縮計を活用した方法が使用されている。2. Description of the Related Art Conventionally, when landslide countermeasure work is performed, the construction site and its scale are determined by measuring the depth and movement amount of the slip surface in the landslide area. Therefore, (1) methods for measuring the depth of the landslide surface include (a) a method using a pipe strain gauge, (b) a method using a slip surface detecting cable, and (c) JP-A-4-95716.
There is a landslide surface detection method disclosed in the publication, and (2) as a method for measuring the amount of movement of the slip surface,
(d) A method utilizing an extensometer is used.
【０００３】そして(ａ)パイプ歪計を使用する方法は、
塩化ビニールパイプに歪ゲージを張り付けたものを地中
に垂直に固定し、地すべり発生によって塩化ビニールパ
イプに生じる圧力の変化を検出し、該当する歪ゲージの
張り付け位置からすべり面の深さを求めるようにしたも
のである。また(ｂ)すべり面検知ケーブルを使用する方
法は、すべり面検知ケーブルを地中に垂直に固定し、地
すべりの発生によってすべり面で同軸ケーブルが切断さ
れることを利用し、地上からすべり面までの同軸ケーブ
ルの長さを電気パルスを用いて測定するものである。ま
た(ｃ)特開平4-95716号公報に開示されている地すべり
面検出方法は、感圧ケーブルを地中に垂直に固定し、地
すべりの発生によってすべり面でケーブルの圧縮による
特性インピーダンスの変化位置を電気パルスを用いて測
定するものである。さらに(ｄ)伸縮計を活用した方法
は、塩化ビニールパイプ内を通したインバー線を地中に
垂直に固定し、地すべりの発生によってすべり面で塩化
ビニールパイプが切断されパイプ内を通るインバー線
が、地中に引き込まれた量を記録する伸縮計により測定
するものである。And (a) the method using the pipe strain gauge is as follows:
A strain gauge attached to a vinyl chloride pipe is fixed vertically in the ground, the change in pressure generated in the vinyl chloride pipe due to the occurrence of a landslide is detected, and the depth of the slip surface is determined from the position where the strain gauge is attached. It is the one. In addition, (b) The method of using the slip surface detection cable is to fix the slip surface detection cable vertically in the ground and use the fact that the coaxial cable is cut at the slip surface due to the occurrence of a landslide. The length of the coaxial cable is measured by using an electric pulse. Further, (c) the method of detecting a landslide surface disclosed in Japanese Patent Laid-Open No. 4-95716 discloses a method in which a pressure-sensitive cable is fixed vertically in the ground, and the position where the characteristic impedance changes due to compression of the cable on the slip surface due to the occurrence of a landslide. Is measured using an electric pulse. In addition, (d) The method utilizing an extensometer is that the Invar wire that passes through the vinyl chloride pipe is fixed vertically in the ground, and the vinyl chloride pipe is cut at the slip surface due to the occurrence of a landslide and the Invar wire that passes through the pipe is It is measured by an extensometer that records the amount of material drawn into the ground.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、(ａ)の
方法では、測定分解能を上げるのに多量の歪ゲージ及び
リード線を必要とし、測定に時間がかかるという問題が
あり、(ｂ)の方法では、地すべり発生の初期段階におい
て地すべりの移動量が少ない場合には、検知ケーブルの
切断が発生しないため検出できず、また検知ケーブルを
地中に固定するため水位観測用の観測井を別に必要と
し、また移動量の測定ができないという問題があり、
(ｃ)の方法では、移動量の測定範囲が微少量であり、ま
た移動量の測定ができないという問題があり、(ｄ)の方
法では、すべり面の深さの測定ができないという問題が
あった。However, the method (a) has a problem that a large amount of strain gauges and lead wires are required to increase the measurement resolution, and it takes a long time to perform the measurement. If the amount of landslide movement is small in the initial stage of landslide occurrence, it cannot be detected because the detection cable does not break, and a separate observation well for water level observation is required to fix the detection cable in the ground. Also, there is a problem that the amount of movement cannot be measured,
The method (c) has a problem that the measuring range of the moving amount is very small and the moving amount cannot be measured, and the method (d) has a problem that the depth of the slip surface cannot be measured. It was
【０００５】そこでこの発明の目的は、前記の地すべり
観測方法(ａ)(ｂ)(ｃ)(ｄ)のもつ問題を解消し、測定分
解能を上げるのに多量の歪ゲージ及びリード線を必要と
することがなく、また測定に時間がかかることがなく、
地すべり発生の初期段階において地すべりの移動量が少
ない場合でもこれを検出することができ、また検知ケー
ブルを地中に固定するため水位観測用の観測井を別に必
要とすることがなく、さらに移動量の測定もでき、移動
量の測定範囲が広く、すべり面の深さの測定ができ、こ
のようにして地すべり発生の深度と移動量を同時に、短
時間で測定することができる地すべり観測方法を提供す
るにある。Therefore, an object of the present invention is to solve the problems of the landslide observation methods (a), (b), (c) and (d) described above and to use a large amount of strain gauges and lead wires in order to improve the measurement resolution. And does not take a long time to measure,
Even if the amount of landslide movement is small in the initial stage of landslide occurrence, it can be detected, and since the detection cable is fixed in the ground, there is no need for a separate observation well for water level observation. It also provides a landslide observation method that can measure the amount of movement, has a wide range of movement, and can measure the depth of the landslide surface. In this way, the depth of landslide occurrence and the amount of movement can be measured simultaneously in a short time. There is.
【０００６】[0006]
【課題を解決するための手段】この発明は、前記のよう
な目的を達成するために、請求項１の発明は、地表から
掘削した観測孔に感圧ケーブルを設置し、該感圧ケーブ
ルの抵抗値を測定して該抵抗値が低下したところで、前
記感圧ケーブルに一定の時間間隔でパルスを入射し、こ
の入射パルスと異なる極性の反射パルスを観測すること
により、地すべり面の深さを測定する地すべり観測方法
において、前記感圧ケーブルの芯線の下端をすべり面よ
り下の地盤に固定し、上端を地表面に設置された移動計
に取付け、芯線の感圧ケーブル内における移動量を移動
計によって測定することにより、地すべりの移動量を同
時に測定することを特徴とするものである。請求項２の
発明は、地表から掘削した観測孔に建て込まれるパイプ
と、該パイプの側面に沿って固定される感圧ケーブル
と、該感圧ケーブルの抵抗値を測定する抵抗測定回路
と、前記感圧ケーブルに一定の時間間隔でパルスを入射
するパルス発生手段と、感圧ケーブルにおける入射パル
スに対する反射パルスを観測するオシロスコープとを具
えた地すべり観測装置において、地表面に設置されて感
圧ケーブル内における、感圧ケーブルの芯線の上端の移
動量を測定する移動量測定器を具えていることを特徴と
するものである。In order to achieve the above-mentioned object, the invention of claim 1 is to install a pressure-sensitive cable in an observation hole excavated from the surface of the earth, When the resistance value is measured and the resistance value is lowered, a pulse is incident on the pressure-sensitive cable at a constant time interval, and a reflected pulse having a polarity different from that of the incident pulse is observed to determine the depth of the landslide surface. In the landslide observation method to be measured, the lower end of the core wire of the pressure-sensitive cable is fixed to the ground below the slip surface, the upper end is attached to the mobile meter installed on the ground surface, and the movement amount of the core wire in the pressure-sensitive cable is moved. The feature is that the amount of landslide movement is measured at the same time by measuring with a meter. According to the invention of claim 2, a pipe built in an observation hole excavated from the surface of the earth, a pressure sensitive cable fixed along a side surface of the pipe, and a resistance measuring circuit for measuring a resistance value of the pressure sensitive cable, In a landslide observation device comprising pulse generation means for injecting pulses into the pressure-sensitive cable at regular time intervals and an oscilloscope for observing reflected pulses with respect to incident pulses in the pressure-sensitive cable, a pressure-sensitive cable installed on the ground surface It is characterized by comprising a movement amount measuring device for measuring the movement amount of the upper end of the core wire of the pressure-sensitive cable.
【０００７】[0007]
【作用】前記のようなものにおいて地すべりを検知する
に際しては、地表からの観測孔に感圧ケーブルを設置
し、感圧ケーブルを抵抗測定回路に接続して抵抗測定を
行い、地すべりが発生して感圧ケーブルにせん断と圧縮
が生じて抵抗値が減少すると、地すべりが発生したこと
を抵抗測定回路によって地上において検出し、そこで感
圧ケーブルをパルス発生手段とオシロスコープとに接続
し、パルス発生手段から一定間隔でパルスを出力し、感
圧ケーブルに入射したパルスの入射波と異なる極性の反
射パルスがすべり面に生じ、それがオシロスコープの画
面上に現れることを利用して、その反射パルスの発生深
度すなわちすべり面の深度を測定すると同時に、すべり
面に沿って上方の地盤が移動するに伴って、パイプの下
部が感圧ケーブルと共に移動し、感圧ケーブルの芯線の
下端はすべり面の下側の地盤に沿って移動して芯線の上
端も同様に移動し、この芯線の移動量が移動計によって
測定され、このようにしてすべり面を境にした地盤の移
動量を測定し、またパイプを利用した地下水位の観測も
可能となる。[Function] When detecting a landslide in the above-mentioned type, a pressure-sensitive cable is installed in the observation hole from the surface of the earth, and the pressure-sensitive cable is connected to the resistance measuring circuit to perform resistance measurement. When the resistance value decreases due to shearing and compression of the pressure-sensitive cable, the occurrence of landslide is detected on the ground by the resistance measurement circuit, and the pressure-sensitive cable is connected to the pulse generation means and the oscilloscope there. By outputting pulses at regular intervals, a reflected pulse with a polarity different from the incident wave of the pulse incident on the pressure-sensitive cable is generated on the slip surface, and it appears on the oscilloscope screen. That is, the depth of the slip surface is measured, and at the same time, the lower part of the pipe becomes a pressure-sensitive cable as the upper ground moves along the slip surface. , The lower end of the core wire of the pressure-sensitive cable moves along the ground below the slip surface, and the upper end of the core wire also moves, and the movement amount of this core wire is measured by a mobile meter. It is also possible to measure the amount of ground movement across the slip surface and observe the groundwater level using a pipe.
【０００８】[0008]
【実施例】図面に示すこの発明の実施例において、１は
地すべり地３にボーリングによって掘削した観測孔４中
に建て込まれた塩化ビニールパイプを示し、このパイプ
１に沿って感圧ケーブル２が設置され、これらの両部材
１，２は観測孔４中において、砂からなる間詰部材５に
よってほぼ垂直に保持される。なおパイプ１は他の材料
製でもよい。感圧ケーブル２は図２に示すように、中心
から外側にかけて順次、金属導体製芯線７、導電性ゴム
層８、絶縁編組線層９、導電性ゴム層10、金属編組線層
11、ケーブルシース12によって構成され、圧縮を受ける
と導電性ゴム層８，10が絶縁編組線層９に入り込んで、
内外の金属導体７，11が導電性ゴム層８，10で電気的に
短絡するようになっており、これは一般的にフェンス等
に取付けられて防犯検知器として用いられるものと同様
である。そしてこのような感圧ケーブル２にスイッチ14
を介して、抵抗測定回路15、パルス発生手段16及びオシ
ロスコープ17が接続されている。このような感圧ケーブ
ル２の芯線７の下端は、図示しないアンカーを用いてす
べり面より下の地盤に固定され、上端は移動計21の２個
の滑車22，23に懸架されて、その先端に重錘24が取付け
られ、芯線７の移動量は目盛板26によって測定され、記
録器27に記録されるようになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in the drawings, reference numeral 1 denotes a vinyl chloride pipe built in an observation hole 4 excavated by boring in a landslide land 3, along which a pressure-sensitive cable 2 is attached. The two members 1 and 2 are installed and held in the observation hole 4 almost vertically by the interlocking member 5 made of sand. The pipe 1 may be made of another material. As shown in FIG. 2, the pressure-sensitive cable 2 has a metal conductor core wire 7, a conductive rubber layer 8, an insulating braided wire layer 9, a conductive rubber layer 10, and a metal braided wire layer in order from the center to the outside.
11, the cable sheath 12, the conductive rubber layers 8 and 10 enter the insulating braided wire layer 9 when compressed,
The inner and outer metal conductors 7 and 11 are electrically short-circuited by the conductive rubber layers 8 and 10. This is similar to the one generally attached to a fence or the like and used as a crime prevention detector. And switch 14 to such pressure sensitive cable 2
The resistance measuring circuit 15, the pulse generating means 16 and the oscilloscope 17 are connected via the. The lower end of the core wire 7 of the pressure-sensitive cable 2 is fixed to the ground below the slip surface using an anchor (not shown), and the upper end is suspended by the two pulleys 22 and 23 of the mobile gauge 21 and its tip end is suspended. A weight 24 is attached to the weight, and the moving amount of the core wire 7 is measured by a scale plate 26 and recorded in a recorder 27.
【０００８】前記のようなものにおいて地すべりを検知
するに際しては、地表からの観測孔４に建て込んだパイ
プ１の側面に沿って感圧ケーブル２を設置し、スイッチ
14の操作によって感圧ケーブル２を抵抗測定回路15に接
続して抵抗測定を行い、地すべりが発生していないとき
は抵抗値が無限大に近い値を示すが、地すべりが発生す
ると感圧ケーブル２にせん断と圧縮が生じて抵抗値は著
しく減少した値となることから、地すべりの発生が抵抗
測定回路15によって地上において検出される。そこでス
イッチ14を切り替えて感圧ケーブル２をパルス発生手段
16とオシロスコープ17とに接続する。パルス発生手段16
からは一定間隔でパルスが出力されており、感圧ケーブ
ル２に入射したパルスはすべり面28における感圧ケーブ
ル２の特性インピーダンス変化点と、感圧ケーブル２の
終端とに反射波を生ずる。ところですべり面28では感圧
ケーブル２がせん断と圧縮とを受けるため、図３に示す
ようにインピーダンスが低下して入射波ａとは異なる極
性の反射パルスｂを生じ、また感圧ケーブル２の終端で
は入射波ａと同じ極性の反射波ｃを生じ、これがオシロ
スコープ17の画面上に現れることとなり、反射パルスｂ
によって地すべり面28の深さを測定することとなる。ま
たパイプ１を利用した地下水位の観測も可能となる。When detecting a landslide in the above-mentioned device, the pressure-sensitive cable 2 is installed along the side surface of the pipe 1 built in the observation hole 4 from the surface of the earth, and the switch is installed.
When the pressure sensing cable 2 is connected to the resistance measuring circuit 15 by the operation of 14, resistance measurement is performed. When the landslide does not occur, the resistance value shows a value close to infinity, but when the landslide occurs, the pressure sensing cable 2 Since shearing and compression occur in the ground and the resistance value becomes a significantly reduced value, the occurrence of a landslide is detected by the resistance measuring circuit 15 on the ground. Therefore, the switch 14 is switched to make the pressure-sensitive cable 2 a pulse generating means.
16 and oscilloscope 17. Pulse generator 16
, Pulses are output at regular intervals, and the pulses incident on the pressure-sensitive cable 2 generate reflected waves at the characteristic impedance change point of the pressure-sensitive cable 2 on the sliding surface 28 and at the end of the pressure-sensitive cable 2. However, since the pressure-sensitive cable 2 is subjected to shearing and compression on the sliding surface 28, the impedance is lowered as shown in FIG. 3 to generate a reflected pulse b having a polarity different from that of the incident wave a, and the pressure-sensitive cable 2 is terminated. Causes a reflected wave c having the same polarity as the incident wave a, which appears on the screen of the oscilloscope 17, and the reflected pulse b
Therefore, the depth of the landslide surface 28 will be measured. Also, it becomes possible to observe the groundwater level using the pipe 1.
【０００９】図４は地すべりの発生により、すべり面28
に沿って上方の地盤が移動するに伴って、パイプ１の下
部が感圧ケーブル２と共に移動した状態を示し、この移
動によって感圧ケーブル２の芯線７の下端はすべり面28
の下方の地盤に沿って移動するため、芯線７の上端も同
様に移動し、このすべり面28を境にした芯線７の移動量
が目盛板26によって測定されて記録器27に記録され、こ
のようにしてすべり面を境にした地盤の移動量が測定さ
れる。FIG. 4 shows a slip surface 28 caused by the occurrence of a landslide.
The lower part of the pipe 1 is moved together with the pressure-sensitive cable 2 as the upper ground is moved along it, and the lower end of the core wire 7 of the pressure-sensitive cable 2 is slipped by the sliding surface 28.
Since it moves along the ground below, the upper end of the core wire 7 also moves, and the moving amount of the core wire 7 with the slip surface 28 as a boundary is measured by the scale plate 26 and recorded in the recorder 27. In this way, the amount of ground movement across the slip surface is measured.
【００１０】[0010]
【発明の効果】この発明は前記のようであって、請求項
１の発明は、地表から掘削した観測孔に感圧ケーブルを
設置し、該感圧ケーブルの抵抗値を測定して該抵抗値が
低下したところで、前記感圧ケーブルに一定の時間間隔
でパルスを入射し、この入射パルスと異なる極性の反射
パルスを観測するオシロスコープで観測することによ
り、すべり面の深さを測定し、同時に感圧ケーブルの芯
線の下端をすべり面より下の地盤に固定し、上端を地表
面に設置された移動計に取付け、芯線の感圧ケーブル内
における移動量を移動計によって測定することにより、
地すべりの移動量を測定するようになっているので、測
定分解能を上げるのに多量の歪ゲージ及びリード線を必
要とすることがなく、地すべり発生の初期段階において
地すべりの移動量が少ない場合でもこれを検出すること
ができ、また検知ケーブルを地中に固定するため水位観
測用の観測井を必要とすることがなく、さらに移動量を
広範囲に測定できると共にすべり面の深さの測定がで
き、地すべり発生の深度と移動量を同時に、短時間で測
定することができるという効果がある。請求項２の発明
は、地表から掘削した観測孔に建て込まれるパイプと、
該パイプの側面に沿って固定される感圧ケーブルと、該
感圧ケーブルの抵抗値を測定する抵抗測定回路と、感圧
ケーブルに一定の時間間隔でパルスを入射するパルス発
生手段と、感圧ケーブルにおける入射パルスに対する反
射パルスを観測するオシロスコープと、地表面に設置さ
れて感圧ケーブルの芯線の上端の移動量を測定する移動
量測定器とを具えているので、感圧ケーブルがパイプに
よって正確にその位置に保持されるのに加えて、地下水
位を観測することもでき、また感圧ケーブルの抵抗測定
から地すべりの発生を初期の段階から検出し、パルス発
生手段の信号を感圧ケーブルに入射した際の反射波をオ
シロスコープで観測することから、地すべり面の深さを
自動的にかつ容易に測定することができ、また感圧ケー
ブルの芯線を用いてその下端を地すべり面の下方に固定
し、上端を移動量測定器に接続することにより、地すべ
り面下の地盤の移動量を自動的かつ容易に測定すること
ができ、しかもそれらの測定が短時間で行われて観測費
用を安価なものとすることができるという効果がある。The present invention is as described above. According to the invention of claim 1, a pressure sensitive cable is installed in an observation hole excavated from the surface of the earth, the resistance value of the pressure sensitive cable is measured, and the resistance value is measured. , The pulse is incident on the pressure-sensitive cable at a constant time interval, and the depth of the slip surface is measured by observing the reflected pulse of a polarity different from this incident pulse with an oscilloscope. By fixing the lower end of the core wire of the pressure cable to the ground below the slip surface, attaching the upper end to the mobile meter installed on the ground surface, and measuring the amount of movement of the core wire in the pressure-sensitive cable by the mobile meter,
Since it measures the amount of landslide movement, it does not require a large amount of strain gauges and lead wires to improve the measurement resolution, and even if the amount of landslide movement is small at the initial stage of landslide occurrence, this Can be detected, and because the detection cable is fixed in the ground, there is no need for an observation well for water level observation, and the amount of movement can be measured over a wide range and the depth of the slip surface can be measured. There is an effect that the depth of landslide occurrence and the amount of movement can be simultaneously measured in a short time. The invention of claim 2 is a pipe built in an observation hole excavated from the surface of the earth,
A pressure-sensitive cable fixed along the side surface of the pipe, a resistance measuring circuit for measuring a resistance value of the pressure-sensitive cable, a pulse generating means for injecting a pulse into the pressure-sensitive cable at a constant time interval, and a pressure-sensitive cable. It has an oscilloscope that observes the reflected pulse with respect to the incident pulse in the cable, and a movement amount measuring device that is installed on the ground surface and measures the movement amount of the upper end of the core wire of the pressure sensitive cable. In addition to being held at that position, the groundwater level can also be observed, and the occurrence of a landslide can be detected from the initial stage by measuring the resistance of the pressure-sensitive cable, and the signal of the pulse generation means can be sent to the pressure-sensitive cable. Since the reflected wave when incident is observed with an oscilloscope, the depth of the landslide surface can be automatically and easily measured, and the core wire of the pressure sensitive cable is used. By fixing the lower end to the bottom of the landslide surface and connecting the upper end to the movement amount measuring device, the movement amount of the ground below the landslide surface can be automatically and easily measured, and those measurements can be performed in a short time. There is an effect that the observation cost can be made cheap by being carried out in.
【図１】この発明の実施例の構成を示す図面である。FIG. 1 is a drawing showing a configuration of an embodiment of the present invention.
【図２】同上の感圧ケーブルの断面図である。FIG. 2 is a sectional view of the above pressure-sensitive cable.
【図３】この発明のパルス測定を行った場合にオシロス
コープの画面に現れる信号波形を示す図面である。FIG. 3 is a drawing showing a signal waveform that appears on the screen of an oscilloscope when the pulse measurement of the present invention is performed.
【図４】この発明の地すべりの発生により感圧ケーブル
の芯線が移動している状況を示す図面である。FIG. 4 is a view showing a situation where the core wire of the pressure-sensitive cable is moving due to occurrence of landslide of the present invention.
１ パイプ ２ 感圧ケーブル ３ 地すべり地 ４ 観測孔 ７ 金属導体製芯線 ８ 導電性ゴム層 ９ 絶縁編組線層 10 導電性ゴム層 11 金属編組線層 12 ケーブルシース 14 スイッチ 15 抵抗測定回路 16 パルス発生手段 17 オシロスコープ 21 移動計21 22 滑車 23 滑車 24 重錘 26 目盛板 27 記録器 28 すべり面 1 Pipe 2 Pressure Sensitive Cable 3 Landslide 4 Observation Hole 7 Metal Conductor Core Wire 8 Conductive Rubber Layer 9 Insulating Braided Wire Layer 10 Conductive Rubber Layer 11 Metal Braided Wire Layer 12 Cable Sheath 14 Switch 15 Resistance Measuring Circuit 16 Pulse Generation Means 17 Oscilloscope 21 Mobile gauge 21 22 Pulley 23 Pulley 24 Weight 26 Scale plate 27 Recorder 28 Sliding surface
Claims (2)
を設置し、該感圧ケーブルの抵抗値を測定して該抵抗値
が低下したところで、前記感圧ケーブルに一定の時間間
隔でパルスを入射し、この入射パルスと異なる極性の反
射パルスを観測することにより、地すべり面の深さを測
定する地すべり観測方法において、前記感圧ケーブルの
芯線の下端をすべり面より下の地盤に固定し、上端を地
表面に設置された移動計に取付け、芯線の感圧ケーブル
内における移動量を移動計によって測定することによ
り、地すべりの移動量を同時に測定することを特徴とす
る地すべり観測方法。1. A pressure-sensitive cable is installed in an observation hole excavated from the surface of the earth, a resistance value of the pressure-sensitive cable is measured, and when the resistance value decreases, pulses are applied to the pressure-sensitive cable at regular time intervals. Incident, by observing the reflected pulse of a different polarity from this incident pulse, in the landslide observation method to measure the depth of the landslide surface, the lower end of the core wire of the pressure-sensitive cable is fixed to the ground below the slip surface, A landslide observation method characterized by simultaneously measuring the amount of landslide movement by attaching the top end to a movement meter installed on the ground surface and measuring the amount of movement of the core wire within the pressure-sensitive cable with the movement meter.
パイプと、該パイプの側面に沿って固定される感圧ケー
ブルと、該感圧ケーブルの抵抗値を測定する抵抗測定回
路と、前記感圧ケーブルに一定の時間間隔でパルスを入
射するパルス発生手段と、感圧ケーブルにおける入射パ
ルスに対する反射パルスを観測するオシロスコープとを
具えた地すべり観測装置において、地表面に設置されて
感圧ケーブル内における、感圧ケーブルの芯線の上端の
移動量を測定する移動量測定器を具えていることを特徴
とする地すべり観測装置。2. A pipe built in an observation hole excavated from the surface of the earth, a pressure-sensitive cable fixed along a side surface of the pipe, a resistance measuring circuit for measuring a resistance value of the pressure-sensitive cable, and the sensor. In a landslide observation device equipped with pulse generation means for injecting pulses into the pressure cable at regular time intervals and an oscilloscope for observing reflected pulses with respect to incident pulses in the pressure sensitive cable, the landslide observation device installed on the ground surface , A landslide observation device comprising a movement amount measuring device for measuring the movement amount of the upper end of the core wire of the pressure-sensitive cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20733893A JPH0796770B2 (en) | 1993-08-23 | 1993-08-23 | Landslide observation method and its equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20733893A JPH0796770B2 (en) | 1993-08-23 | 1993-08-23 | Landslide observation method and its equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0762640A true JPH0762640A (en) | 1995-03-07 |
| JPH0796770B2 JPH0796770B2 (en) | 1995-10-18 |
Family
ID=16538096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20733893A Expired - Lifetime JPH0796770B2 (en) | 1993-08-23 | 1993-08-23 | Landslide observation method and its equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796770B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312362C (en) * | 2004-05-28 | 2007-04-25 | 中国科学院力学研究所 | Analogic testing device for water induced landslide and method for monitoring shift of land top surface |
| CN104819685A (en) * | 2015-04-29 | 2015-08-05 | 长安大学 | Landslide monitoring device based on TDR technology and landslide monitoring method thereof |
| CN105091840A (en) * | 2015-05-04 | 2015-11-25 | 中国地质科学院探矿工艺研究所 | Guide-wheel-free inclinometer for measuring deep displacement of landslide and installation method thereof |
| GB2617135A (en) * | 2022-03-30 | 2023-10-04 | Viper Innovations Ltd | Cable motion monitoring |
-
1993
- 1993-08-23 JP JP20733893A patent/JPH0796770B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1312362C (en) * | 2004-05-28 | 2007-04-25 | 中国科学院力学研究所 | Analogic testing device for water induced landslide and method for monitoring shift of land top surface |
| CN104819685A (en) * | 2015-04-29 | 2015-08-05 | 长安大学 | Landslide monitoring device based on TDR technology and landslide monitoring method thereof |
| CN105091840A (en) * | 2015-05-04 | 2015-11-25 | 中国地质科学院探矿工艺研究所 | Guide-wheel-free inclinometer for measuring deep displacement of landslide and installation method thereof |
| GB2617135A (en) * | 2022-03-30 | 2023-10-04 | Viper Innovations Ltd | Cable motion monitoring |
| GB2617135B (en) * | 2022-03-30 | 2024-05-01 | Viper Innovations Ltd | Cable motion monitoring |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0796770B2 (en) | 1995-10-18 |
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