JPH02287215A - Measurement of loosening range for subsoil - Google Patents
Measurement of loosening range for subsoilInfo
- Publication number
- JPH02287215A JPH02287215A JP1110975A JP11097589A JPH02287215A JP H02287215 A JPH02287215 A JP H02287215A JP 1110975 A JP1110975 A JP 1110975A JP 11097589 A JP11097589 A JP 11097589A JP H02287215 A JPH02287215 A JP H02287215A
- Authority
- JP
- Japan
- Prior art keywords
- subsoil
- steel material
- strain gauges
- ground
- measuring
- 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
- 238000005259 measurement Methods 0.000 title claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 6
- 239000000057 synthetic resin Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- 238000005187 foaming Methods 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
この発明は、主としてトンネル掘削におけるその周辺地
盤等、地盤の緩み範囲を測定する方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for measuring the looseness range of ground, such as surrounding ground, mainly during tunnel excavation.
「従来の技術、発明が解決せんとする問題点」従来の地
盤の緩み範囲測定方法として、地中に複数の変位計を取
付けた計測ロットな貫入しその計測口“ラドの長手方向
（トンネルの径方向）の変位や応力と深さの関係をグラ
フに表してその曲線の変曲点から緩みの深さを測定する
地中変位計測法、或いは坑内から地盤に振動波を発信し
て、その伝搬速度の低下した部分を緩みとして検出する
弾性波試験法板どが知られているが、前者では地盤が硬
岩である場合に、不連続面（割れ目）の開きによって変
曲点が明確に検知できる可能性はあるが、地盤が軟岩の
場合には変曲点が明確に表れないためほとんど検知でき
ない欠点があり、また後者では精度が低く、特に軟岩の
場合に地盤の良否による速度差が小さいため、＊み範囲
を明確に検出できない欠点があった。``Prior art and problems to be solved by the invention'' As a conventional method for measuring the looseness range of the ground, a measurement lot is penetrated into the ground with multiple displacement meters installed, and the measurement port ``in the longitudinal direction of the tunnel'' is used. An underground displacement measurement method that graphs the relationship between displacement (radial direction) or stress and depth and measures the depth of slack from the inflection point of the curve, or transmits vibration waves from inside the mine to the ground. An elastic wave test method is known that detects areas where the propagation speed has decreased as slack, but in the former case, when the ground is hard rock, the inflection point is clearly identified by the opening of discontinuities (cracks). Although there is a possibility of detection, if the ground is soft rock, there is a drawback that it is almost impossible to detect because the inflection point is not clearly visible, and in the latter case, the accuracy is low, especially in the case of soft rock, there is a speed difference depending on the quality of the ground. Because it was small, it had the disadvantage that it was not possible to clearly detect the visible area.
「問題点を解決するための手段」
この発明は前記従来の課題を解決するために鋼材の表面
にその長子方向に沿って所要数の歪ゲージを張設し、そ
の上に発泡剛性樹脂を被覆してなる測定計器を、測定地
盤に設けた削孔内に挿入し、その周囲間隙に硬化材を充
填して地盤と一体化し、各歪ゲージにおける鋼材と直角
方向（トンネルの円周方向）の応力計測値を検出して測
定位置に対応した応力分布グラフの変曲点から緩みを知
ることにより、各測定位置に多数の歪ゲージを綿密に配
して鋼材と直角方向の応力を確実に検出し、応力分布グ
ラフ上明確に表れる変曲点から硬岩及び軟岩に拘らず確
実に緩みを知ることを可能とした地盤の緩み範囲測定方
法を提案するものである。"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention provides a required number of strain gauges that are stretched along the longitudinal direction on the surface of a steel material, and covered with foamed rigid resin. The measuring instrument made of the above-mentioned strain gauge is inserted into a borehole made in the measurement ground, and the surrounding gap is filled with hardening material to integrate it with the ground, and the steel material in each strain gauge is inserted in the perpendicular direction (the circumferential direction of the tunnel). By detecting stress measurement values and knowing the slack from the inflection point of the stress distribution graph corresponding to the measurement position, we can reliably detect the stress in the direction perpendicular to the steel material by carefully arranging many strain gauges at each measurement position. This paper proposes a method for measuring the range of loosening of the ground, which makes it possible to reliably determine the loosening of the ground, regardless of whether it is hard or soft rock, from the inflection point that clearly appears on the stress distribution graph.
「実施例」
以下この発明を図面に示すトンネル周辺地盤の緩みを測
定する実施例について説明すると、トンネル坑内ｌから
或いは地とから計測地盤に向って削孔し、その削孔２内
に測定計器３を挿入し１周囲の間隙にベントナイト混入
モルタルなどの地盤とほぼ同程度に柔らかい硬化材４を
充填して地盤と固結一体化する。``Example'' Below, an example of this invention for measuring the looseness of the ground around a tunnel as shown in the drawings will be described. A hole is drilled from the tunnel shaft 1 or from the ground toward the measuring ground, and a measuring instrument is installed in the drilled hole 2. 3 is inserted, and a hardening material 4, such as mortar mixed with bentonite, which is approximately as soft as the ground, is filled into the gap around the hardening material 4 to solidify and integrate with the ground.
測定計器３は、主としてＨ型鋼又は■型鋼等の鋼材５の
ウェブにその長手方向に沿って僅小間隔で所要数の板片
状の歪ゲージ６が軸線と直角に張設され、その上に弾性
及び止水性を有するコーテイング材７及び発泡合成樹脂
層８が被覆されており、歪ゲージ６はコーテイング材７
及び発泡合成樹脂層８の弾性材を介して鋼材５と直角方
向（′トンネルの円周方向）の地盤の歪（これから応力
を算出する）を測定するようになっている。The measuring instrument 3 consists of a web of steel material 5, such as H-shaped steel or ■-shaped steel, on which a required number of plate-like strain gauges 6 are stretched at very small intervals along its longitudinal direction at right angles to the axis; The strain gauge 6 is coated with a coating material 7 and a foamed synthetic resin layer 8 having elasticity and waterproof properties.
The strain in the ground (from which stress is calculated) in the direction perpendicular to the steel material 5 (circumferential direction of the tunnel) is measured through the elastic material of the foamed synthetic resin layer 8.
掘削中のトンネル周辺地盤の緩みの測定に際しては、測
定計器３をできるたけ切羽に近い部分、即ち応力開放が
なされておらず、ライニングもされていない部分に埋設
し、また第３図に示すように地表や併設トンネル坑内か
ら掘削トンネル周辺Ｊ１！Ｉｇ１の緩みを測定する場合
には、切羽か到達する以前に予め計測てきるように埋設
する。When measuring the loosening of the ground around a tunnel during excavation, the measuring instrument 3 is buried as close to the face as possible, that is, in a part where stress relief has not been performed and where there is no lining. J1 around the excavated tunnel from the ground surface and inside the attached tunnel! When measuring the slackness of Ig1, bury it so that it can be measured before it reaches the face.
第４図は上記測定計器３により実際ｆＳ：測定して、坑
内１からの各深さ位置にある歪ゲージ６の検出結果を、
ゲージ深さ位置とトンネルの円周方向の応力〜の分布関
係のグラフに表しだもので９本発明のグラフによれば、
従来の地中変位計測法のようにトンネル径方向の応力σ
ｉや変位Ｕ、の関係を示すグラフに比較して緩み領域と
弾性領域の境界としての変曲点が極めて明確となること
が分り、緩みの範囲を正確かつ確実に把握することが可
能となる。FIG. 4 shows the actual fS measured by the measuring instrument 3 and the detection results of the strain gauges 6 at each depth position from the underground mine 1.
According to the graph of the present invention, it is expressed in the graph of the distribution relationship between the gauge depth position and the stress in the circumferential direction of the tunnel.
As with the conventional underground displacement measurement method, the stress σ in the tunnel radial direction
Compared to the graph showing the relationship between i and displacement U, it can be seen that the inflection point as the boundary between the loose region and the elastic region is extremely clear, making it possible to accurately and reliably grasp the range of loosening. .
「発明の効果」
以上の通りこの発明によれば、鋼材の表面にその長手方
向に沿って所要数の歪ゲージを張設し、その上に発泡合
成樹脂を被覆してなる測定計器を、測定地盤に設けた削
孔内に挿入し、その周囲間隙に硬化材を充填して地盤と
一体化し各歪ゲージにおける鋼材と直角方向の歪の計測
値を検出して測定位置に対応した応力分布グラフの変曲
点から緩みを知るので、緩みの範囲を正確かつ確実に把
握することが可能となり、また歪ゲージを鋼材にその軸
方向と直角に貼るので測定点を密にして綿密に測定する
ことが可能となる。``Effects of the Invention'' As described above, according to the present invention, a measuring instrument comprising a required number of strain gauges stretched along the longitudinal direction on the surface of a steel material and covered with foamed synthetic resin can be used to measure A stress distribution graph corresponding to the measurement position is created by inserting the strain gauge into a drilled hole in the ground, filling the gap around it with a hardening material, and integrating it with the ground.The strain gauge measures the strain in the direction perpendicular to the steel material. Since the slackness can be determined from the inflection point of the steel, it is possible to accurately and reliably grasp the range of slackness.Also, since the strain gauge is attached to the steel material perpendicular to its axial direction, it is possible to measure it closely by placing the measurement points close together. becomes possible.
第１図はこの発明の実施例を示す縦断正面図第２図はこ
の発明に係る測定計器の横断面図第３図は同側面図、第
４図はこの発明と従来の計測法により得られたゲージ深
さ位置と径方向応力及び周方向応力又は変位の分布関係
の一例を示す線図である。
１・・トンネル坑内、２・・削孔。
３・・測定計器、４・・硬化材、５・・鋼材、６・・歪
ゲージ、７・・コーテイング材、８・・発泡合成樹脂。
第
図
第
図
第
図FIG. 1 is a vertical cross-sectional front view showing an embodiment of the present invention. FIG. 2 is a cross-sectional view of a measuring instrument according to the present invention. FIG. 3 is a side view of the measuring instrument according to the present invention. FIG. 3 is a diagram showing an example of the relationship between the gauge depth position and the distribution of radial stress, circumferential stress, or displacement. 1. Inside the tunnel, 2. Drilling. 3. Measuring instrument, 4. Hardened material, 5. Steel material, 6. Strain gauge, 7. Coating material, 8. Foamed synthetic resin. Figure Figure Figure
Claims (1)
ジを張設し、その上に発泡合成樹脂を被覆してなる測定
計器を、測定地盤に設けた削孔内に挿入し、その周囲間
隙に硬化材を充填して地盤と一体化し、前記各歪ゲージ
における前記鋼材と直角方向の応力の計測値を検出して
測定位置に対応した応力分布グラフの変曲点から緩みを
知ることを特徴とする地盤の緩み範囲測定方法。1) A measuring instrument consisting of a required number of strain gauges stretched along the longitudinal direction on the surface of the steel material and covered with foamed synthetic resin is inserted into a hole made in the measurement ground. Filling the surrounding gap with hardening material and integrating it with the ground, detecting the measured value of stress in the direction perpendicular to the steel material in each of the strain gauges, and knowing the loosening from the inflection point of the stress distribution graph corresponding to the measurement position. A method for measuring the looseness range of the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110975A JP2754035B2 (en) | 1989-04-28 | 1989-04-28 | Ground looseness measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1110975A JP2754035B2 (en) | 1989-04-28 | 1989-04-28 | Ground looseness measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02287215A true JPH02287215A (en) | 1990-11-27 |
| JP2754035B2 JP2754035B2 (en) | 1998-05-20 |
Family
ID=14549235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1110975A Expired - Fee Related JP2754035B2 (en) | 1989-04-28 | 1989-04-28 | Ground looseness measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2754035B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539024A (en) * | 2012-02-14 | 2012-07-04 | 浙江鼎丰实业有限公司 | System for automatically monitoring stress of interpolation H-shaped steel by soil mixing wall (SMW) construction method |
| CN104359604A (en) * | 2014-11-07 | 2015-02-18 | 大连理工大学 | Machine tool assembly combing face stress distribution measuring thin film, system and method |
-
1989
- 1989-04-28 JP JP1110975A patent/JP2754035B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539024A (en) * | 2012-02-14 | 2012-07-04 | 浙江鼎丰实业有限公司 | System for automatically monitoring stress of interpolation H-shaped steel by soil mixing wall (SMW) construction method |
| CN104359604A (en) * | 2014-11-07 | 2015-02-18 | 大连理工大学 | Machine tool assembly combing face stress distribution measuring thin film, system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2754035B2 (en) | 1998-05-20 |
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