JPH0220953B2 - - Google Patents
Info
- Publication number
- JPH0220953B2 JPH0220953B2 JP59016108A JP1610884A JPH0220953B2 JP H0220953 B2 JPH0220953 B2 JP H0220953B2 JP 59016108 A JP59016108 A JP 59016108A JP 1610884 A JP1610884 A JP 1610884A JP H0220953 B2 JPH0220953 B2 JP H0220953B2
- Authority
- JP
- Japan
- Prior art keywords
- cylindrical body
- hollow cylindrical
- rubber tube
- impact
- outside
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 12
- 239000002360 explosive Substances 0.000 claims description 11
- 239000011435 rock Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 description 4
- 238000011835 investigation Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003721 gunpowder Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
- G01V1/104—Generating seismic energy using explosive charges
Description
【発明の詳細な説明】
本発明は地盤調査に用いる新規な衝撃せん断力
（Ｓ波）発生装置及びこの装置を用いる新規なPS
検層法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel impact shear force (S wave) generator used for ground investigation and a novel PS using this device.
It is related to well logging method.
PS検層法とは、地盤に第１図に示すボーリン
グ孔３を掘削し、このボーリング孔に地震計５を
所定深さ位置に固定したのち、孔口近傍の地表部
において板Ｂ（長さ1.5ｍ、幅0.5ｍ、厚さ0.1ｍ）
を平らに設置し、この板の両木口を掛矢で打撃
し、この打撃により板Ｂと地盤の面に生じたせん
断力（Ｓ波）の波動の伝播（矢印８）を地震計５
で測定し、その到達時間により地盤の動的性質を
求める地盤調査方法である。このような調査にお
いては、より深部までの測定が必要であるにも拘
らず現行の方法では打撃力が弱く、かつ地表部の
軟弱な土すなわち表土１でのせん断力の減衰が大
きいため、深部まで波動が到達しないという不具
合がある。 The PS logging method involves drilling a borehole 3 in the ground as shown in Figure 1, fixing a seismometer 5 in the borehole at a predetermined depth position, and then placing a plate B (length 1.5m, width 0.5m, thickness 0.1m)
was placed flat, and both ends of this board were hit with a hanging arrow, and the wave propagation (arrow 8) of the shear force (S wave) generated on the surface of board B and the ground due to this hitting was measured using a seismometer 5.
This is a ground investigation method that determines the dynamic properties of the ground based on the arrival time. In such surveys, it is necessary to measure deeper, but the current method has a weak impact force, and the shear force attenuation is large in the soft soil at the surface, that is, the topsoil 1. There is a problem that the waves do not reach up to the point.
本発明は、この現行のPS検層法の欠点を改善
するに用いる新規な衝撃せん断力発生装置を提供
すること、およびこの装置を用いる改良したPS
検層法を提供することを目的とするものである。 The present invention provides a new impact shear force generating device used to improve the shortcomings of the current PS logging method, and an improved PS logging method using this device.
The purpose is to provide a well logging method.
すなわち、まず本発明は、内部薬室に爆薬を装
填した中空円筒体と、この中空円筒体の任意の一
方の端部を閉じる起振方向操作栓と、前記中空円
筒体の外側にかぶせられ内部に水を導入して膨満
せしめ得るゴムチユーブと、このゴムチユーブの
外側から片側に取付けた背当て金具とを包含して
成る、せん断方向を上下に変換可能な衝撃せん断
力発生装置にある。 That is, first of all, the present invention provides a hollow cylindrical body whose internal chamber is loaded with explosives, an oscillation direction control stopper that closes any one end of the hollow cylindrical body, and an oscillation direction control plug that is placed over the outside of the hollow cylindrical body and that is placed inside the hollow cylindrical body. This impact shearing force generating device includes a rubber tube that can be inflated by introducing water into the rubber tube, and a backrest fitting attached to one side from the outside of the rubber tube, and can convert the shearing direction up and down.
本発明装置を用いれば、火薬の爆発力を利用す
るため充分に大きなせん断力を生ぜしめることが
できる。また本発明装置は簡単な地表からの操作
でこれをボーリング孔の孔壁岩盤に容易にしかも
充分に圧着固定することができる。さらに衝撃せ
ん断力の方向を自由に上下に選定することが可能
である。 By using the device of the present invention, a sufficiently large shearing force can be generated by utilizing the explosive power of gunpowder. Further, the device of the present invention can be easily and sufficiently crimped and fixed to the rock mass of the borehole wall by simple operation from the ground surface. Furthermore, the direction of the impact shearing force can be freely selected up or down.
また本発明は、上述のような衝撃せん断力発生
装置を使用するPS検層法において、地震計を孔
内に設置した測定用ボーリング孔に隣接して岩盤
までボーリングを行ない、この第２のボーリング
孔の孔底付近の孔壁岩盤に、前記衝撃せん断力発
生装置を前記ゴムチユーブ内に注水してこれを膨
満せしめることにより圧着せしめ、前記内部薬室
内の爆薬を起爆することにより前記起振方向操作
栓で封鎖されてない自由面方向に衝撃せん断力を
岩盤深さにおいて作用せしめることを特徴とす
る。 Furthermore, in the PS logging method using the above-mentioned impact shear force generator, the present invention involves boring to bedrock adjacent to a measurement borehole in which a seismometer is installed, and this second boring The impact shearing force generating device is pressed against the hole wall rock near the bottom of the hole by injecting water into the rubber tube to inflate it, and the excitation direction is controlled by detonating the explosive in the internal chamber. It is characterized by applying an impact shearing force at the depth of the rock in the direction of the free surface that is not blocked by the plug.
本発明方法によれば、強い衝撃せん断力を堅固
な岩盤に直接作用せしめるので、せん断力の減衰
も小さく、波動は相当の深部までも到達するので
ある。 According to the method of the present invention, strong impact shearing force is applied directly to the solid rock, so the attenuation of the shearing force is small and the waves can reach considerable depths.
以下本発明を添付図面に例示したその好適な実
施例について詳述する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to preferred embodiments illustrated in the accompanying drawings.
第１図において、軟弱な表土１および堅固な岩
盤２から成る地盤に測定用ボーリング孔３を掘削
し、その孔底付近に地震計５を設置するまでは前
述の従来例と同じである。なお符号６は測定装置
を示す。 In FIG. 1, the process is the same as the conventional example described above until a measuring borehole 3 is excavated in the ground consisting of soft topsoil 1 and hard rock 2 and a seismometer 5 is installed near the bottom of the borehole. Note that the reference numeral 6 indicates a measuring device.
本発明によればこの第１のボーリング孔３に隣
接し、岩盤２の深さまでボーリングを行ない、こ
のようにして形成した第２のボーリング孔４の孔
底より１メートル程度上方の深さ位置に衝撃せん
断力発生装置Ａを設置する。 According to the present invention, adjacent to this first boring hole 3, boring is performed to the depth of the rock mass 2, and a hole is bored at a depth of about 1 meter above the bottom of the second boring hole 4 thus formed. Install impact shear force generator A.
この衝撃せん断力発生装置Ａの構造を第２図
（および第３図）に例示する。この第２図から明
かなように衝撃せん断力発生装置Ａは、鋼製の中
空円筒体９を本体とする。この中空円筒体９はそ
の軸線方向に貫通する内部薬室１０内に爆薬（た
とえば少量のダイナマイトと電気雷管）を装填し
ているが、図示の状態は起爆時であるので爆薬は
示されていない。この中空円筒体９の両端内部に
はねじ１７，１７′が切られており、任意の一端
（第２図では下端）を起振方向操作栓１１をねじ
込んで封鎖してある。 The structure of this impact shearing force generating device A is illustrated in FIG. 2 (and FIG. 3). As is clear from FIG. 2, the impact shearing force generator A has a hollow cylindrical body 9 made of steel as its main body. This hollow cylindrical body 9 is loaded with explosives (for example, a small amount of dynamite and an electric detonator) in an internal chamber 10 that penetrates in the axial direction, but the explosives are not shown because the illustrated state is at the time of detonation. . Threads 17, 17' are cut inside both ends of the hollow cylindrical body 9, and an arbitrary end (lower end in FIG. 2) is closed by screwing an oscillation direction operating plug 11 into the end.
この中空円筒体９の外側には圧着用ゴムチユー
ブ１２をかぶせて、その両端部を中空円筒体９に
密封的に固着せしめてある。このゴムチユーブ１
２と中空円筒体９との間には、中空円筒体９に穿
設した導孔１３およびこれに連結した送水パイプ
１４を介して地表部から注水することができる。 A rubber tube 12 for compression is placed over the outside of the hollow cylindrical body 9, and both ends of the tube are tightly fixed to the hollow cylindrical body 9. This rubber tube 1
2 and the hollow cylindrical body 9, water can be injected from the ground surface through a conduit 13 bored in the hollow cylindrical body 9 and a water pipe 14 connected to the conduit 13.
ゴムチユーブ１２の外側から中空円筒体の片側
には背当て金具１５が取付けてある。この背当て
金具１５の外面には複数個のすべり止めスパイク
１６が突設してあり、これらすべり止めスパイク
１６が孔壁岩盤にしつかりと係合することができ
るようにしてある。 A back support fitting 15 is attached to one side of the hollow cylindrical body from the outside of the rubber tube 12. A plurality of anti-slip spikes 16 are protruded from the outer surface of the back metal fitting 15 so that these anti-slip spikes 16 can firmly engage with the bedrock of the hole wall.
さて、このような装置Ａを第２のボーリング孔
４（第１図）内に吊り下して孔底より１メートル
程度の所定深さ位置に達せしめた後、地上より送
水パイプ１４を介して中空円筒体９とゴムチユー
ブ１２との間に注水すると、背当て金具１５で拘
束されてない側のゴムチユーブが次第に膨満して
第２図に示すようにこのゴムチユーブ１２が孔壁
に一杯に接しその反力で背当て金具１５が反対側
の孔壁に圧着され、そのすべり止めスパイク１６
でしつかりと係合するに至る。この状態で薬室１
０内の爆薬を発破器７により起爆すれば、爆力は
起振方向操作栓１１で封鎖されていない自由面方
向すなわち第２図では上方、に働き、その結果装
置Ａ全体と孔壁岩盤面に下方のせん断力が生ず
る。この衝撃せん断力（SV波）は爆力に由来す
るものであるので充分に大きく、しかも岩盤２に
直接作用するので減衰が少なく、矢印８′（第１
図）に示す伝播は有効、確実に地震計５に到達す
る。 Now, after suspending such a device A into the second borehole 4 (Fig. 1) and reaching a predetermined depth of about 1 meter from the bottom of the hole, When water is injected between the hollow cylindrical body 9 and the rubber tube 12, the rubber tube on the side not restrained by the back metal fitting 15 gradually expands, and as shown in FIG. The backrest metal fitting 15 is crimped to the hole wall on the opposite side by force, and its anti-slip spike 16
This leads to firm engagement. In this state, chamber 1
When the explosive in A is detonated by the blaster 7, the explosive force acts in the direction of the free surface not blocked by the oscillation direction control plug 11, that is, upward in FIG. 2, and as a result, the entire device A and the rock surface of the hole wall A downward shear force is generated. Since this impact shear force (SV wave) is derived from the explosive force, it is sufficiently large, and since it acts directly on the rock mass 2, there is little attenuation.
The propagation shown in Figure) is effective and reaches the seismograph 5 reliably.
従来法では測定可能距離（せん断力によつて生
ずるせん断波の到達距離）は測定地盤の構成にも
よるが、深度100〜200メートルが限度であるが、
本発明によれば1000メートル程度までも可能とな
つた。 With conventional methods, the measurable distance (reaching distance of shear waves caused by shear force) is limited to a depth of 100 to 200 meters, depending on the configuration of the measurement ground.
According to the present invention, it has become possible to reach up to about 1000 meters.
さらに、第３図に示すごとく起振方向操作栓１
１で上端部を封鎖することにより、逆方向のせん
断力が得られる。これは波動の位相逆転を生じ、
せん断波であることの確認を可能とするのであ
る。 Furthermore, as shown in FIG.
By sealing the upper end with 1, a shearing force in the opposite direction is obtained. This causes a phase reversal of the waves,
This makes it possible to confirm that it is a shear wave.
第１図は従来のPS検層法と本発明PS検層法と
を説明する模式的配置断面図、第２図は本発明衝
撃せん断力発生装置の縦断面図、第３図は起振方
向操作栓の取付位置を異にする同様な図である。
１…表土、２…岩盤、３，４…ボーリング孔、
５…地震計、６…測定装置、７…発破器、９…中
空円筒体、１０…薬室、１１…起振方向操作栓、
１２…ゴムチユーブ、１３…導孔、１４…送水パ
イプ、１５…背当て金具、１６…すべり止めスパ
イク、１７，１７′…ねじ。
Figure 1 is a schematic layout cross-sectional view explaining the conventional PS logging method and the PS logging method of the present invention, Figure 2 is a longitudinal cross-sectional view of the impact shear force generator of the present invention, and Figure 3 is the direction of vibration. FIG. 6 is a similar diagram with a different mounting position of the operation plug. 1...Top soil, 2...Bedrock, 3, 4...Borehole,
5... Seismometer, 6... Measuring device, 7... Blaster, 9... Hollow cylindrical body, 10... Gun chamber, 11... Oscillation direction control plug,
12...Rubber tube, 13...Guiding hole, 14...Water pipe, 15...Back support metal fitting, 16...Slip prevention spike, 17, 17'...Screw.
Claims (1)
と、この中空円筒体の任意の一方の端部を閉じる
起振方向操作栓１１と、前記中空円筒体の外側に
かぶせられ内部に水を導入して膨満せしめ得るゴ
ムチユーブ１２と、このゴムチユーブの外側から
片側に取付けた背当て金具４とを包含して成る、
せん断方向を上下に変換可能な衝撃せん断力発生
装置。 ２ 内部薬室１０に爆薬を装填した中空円筒体９
と、この中空円筒体の任意の一方の端部を閉じる
起振方向操作栓１１と、前記中空円筒体の外側に
かぶせられ内部に水を導入して膨満せしめ得るゴ
ムチユーブ１２と、このゴムチユーブの外側から
片側に取付けた背当て金具４とを包含して成る、
せん断方向を上下に変換可能な衝撃せん断力発生
装置Ａを使用するPS検層法において、地震計を
孔内に設置した測定用ボーリング孔３に隣接して
岩盤までボーリングを行ない、この第２のボーリ
ング孔４の孔底付近の孔壁岩盤に、前記衝撃せん
断力発生装置を前記ゴムチユーブ内に注水してこ
れを膨満せしめることにより圧着せしめ、前記内
部薬室内の爆薬を起爆することにより前記起振方
向操作栓で封鎖されてない自由面方向に衝撃せん
断力を岩盤深さにおいて作用せしめることを特徴
とするPS検層法。[Claims] 1. A hollow cylindrical body 9 in which an explosive is loaded into an internal chamber 10
, an oscillation direction control plug 11 that closes any one end of the hollow cylindrical body, a rubber tube 12 that is placed over the outside of the hollow cylindrical body and can be inflated by introducing water into the inside, and an outside of the rubber tube. and a backrest fitting 4 attached to one side.
An impact shear force generator that can convert the shear direction up and down. 2 Hollow cylindrical body 9 with explosives loaded in the internal chamber 10
, an oscillation direction control plug 11 that closes any one end of the hollow cylindrical body, a rubber tube 12 that is placed over the outside of the hollow cylindrical body and can be inflated by introducing water into the inside, and an outside of the rubber tube. and a backrest fitting 4 attached to one side.
In the PS logging method that uses an impact shear force generator A that can convert the shear direction up and down, boring is performed to the bedrock adjacent to the measurement borehole 3 in which a seismometer is installed, and this second The impact shearing force generating device is pressed against the hole wall rock near the bottom of the borehole 4 by injecting water into the rubber tube to inflate it, and the explosive in the internal chamber is detonated to generate the vibration. A PS logging method characterized by applying impact shear force at the depth of the rock in the direction of the free surface that is not blocked by a directional control plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59016108A JPS60161582A (en) | 1984-02-02 | 1984-02-02 | Shock-shearing force generator and ps well logging method using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59016108A JPS60161582A (en) | 1984-02-02 | 1984-02-02 | Shock-shearing force generator and ps well logging method using it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60161582A JPS60161582A (en) | 1985-08-23 |
| JPH0220953B2 true JPH0220953B2 (en) | 1990-05-11 |
Family
ID=11907317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59016108A Granted JPS60161582A (en) | 1984-02-02 | 1984-02-02 | Shock-shearing force generator and ps well logging method using it |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60161582A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH065299B2 (en) * | 1986-06-30 | 1994-01-19 | 大成建設株式会社 | Artificial seismic wave generator |
| JPS63165790A (en) * | 1986-12-26 | 1988-07-09 | Hazama Gumi Ltd | Sonic wave generating apparatus |
| JPH02256473A (en) * | 1989-03-29 | 1990-10-17 | Shoichi Saito | Tire chain fitting device |
| CN103644814A (en) * | 2013-12-13 | 2014-03-19 | 中国神华能源股份有限公司 | Excitation shot hole detection method |
| CN108088716B (en) * | 2017-12-06 | 2020-05-12 | 东北石油大学 | Preparation method of tight rock hydraulic fracturing experimental sample |
-
1984
- 1984-02-02 JP JP59016108A patent/JPS60161582A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60161582A (en) | 1985-08-23 |
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