JP4139007B2 - Rock bed crack exploration system - Google Patents

Rock bed crack exploration system Download PDF

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Publication number
JP4139007B2
JP4139007B2 JP20935399A JP20935399A JP4139007B2 JP 4139007 B2 JP4139007 B2 JP 4139007B2 JP 20935399 A JP20935399 A JP 20935399A JP 20935399 A JP20935399 A JP 20935399A JP 4139007 B2 JP4139007 B2 JP 4139007B2
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Prior art keywords
water
pressure
hole
rock
pore
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JP2001032251A (en
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村 勝 美 亀
村 佳 司 上
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Taisei Corp
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Taisei Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、岩盤の亀裂探査装置に関するものである。
【０００２】
【従来の技術】
従来、岩盤ボーリング現場などにおいて、ボーリング孔内の亀裂や破砕帯の存在を事前に調査するために、開口部をシールしたボーリング孔の開口部から注水し、その時の圧力と注水量を測定する装置があった。
【０００３】
【本発明が解決しようとする課題】
従来の、ボーリング孔内への注水圧力と注水量の測定による亀裂や破砕帯の探査装置は、ボーリング孔内全体の透水性の評価は可能だが、亀裂や破砕帯の位置の特定はできないという問題があった。
【０００４】
【本発明の目的】
本発明は、前記従来構成の問題を解決し、ボーリング孔内の亀裂や、破砕帯の位置の測定を可能とした岩盤の亀裂探査装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、上記の課題を解決する為の手段として、岩盤の孔に配置する有孔管と、有孔管の中に該管の長手方向に沿って等間隔に設置した複数の間隙水圧計と、孔入口のみをシールした岩盤の孔内の全域に加圧注水する注水加圧装置とを備え、前記注水加圧装置で以って孔内の全域に加圧注水した水圧を、有孔管内の複数の間隙水圧計で計測して得た孔内の水圧分布から岩盤の亀裂を探査する、岩盤の亀裂探査装置を提供する。
【０００６】
【発明の実施の形態】
＜イ＞有孔管
本発明に使用する有孔管１は、中空の筒体であり、ボーリング孔の深さ以上の長さを有する。 その外径はボーリング孔の内径より小さく、その内径は後述する間隙水圧計６の外径より大きい。 また、管の内部に連通した等間隔の孔２を有する。
【０００７】
＜ロ＞セントライザー
有孔管の先端部にはソリ形状のセントライザー５を設置する。 ボーリング孔内に有孔管を挿入する際に、不陸、穴曲がりによる摩擦抵抗を軽減し、滑らかな装入作業を可能にする。
【０００８】
＜ハ＞間隙水圧計
有孔管内には、等間隔に間隙水圧計６を設置する。 管に設けた孔より管内に浸入した水の圧力を設置場所ごとに測定することができる。 各々の間隙水圧計６は、ケーブル７で繋ぎ、測定水圧は電気信号によりケーブル７を介して孔の外へ引き出す。
【０００９】
＜ニ＞注水口
注水口１０は、ボーリング孔の開口部に位置する。 孔内に水を注入するための占用の開口部である。 注水口１０を除く開口部は、注水の前に完全にシールする。
【００１０】
＜ホ＞注水加圧装置
注水加圧装置１４は、ポンプで水を加圧する装置である。 当該装置１４は送水管
を介して注水口１０に固定する。 当該装置１４はパソコン９に接続する。 パソコン９を操作することによりポンプの回転を制御し、任意の注入圧力を得ることができる。
【００１１】
＜ヘ＞データロガーおよびパソコン
間隙水圧計からの信号は、孔の外に設置したデータロガー８を介して、パソコン９に連結する。
【００１２】
＜ト＞測定作業（定常状態）
ボーリング孔の開口部に注水口１０を設置する。 注水口１０を除いて開口部を完全にシール１１する。 その後、公知の方法により注水口１０より孔内に一定の圧力で注水１２する。 水圧、流量が定常状態となったことを確認後、間隙水圧計６による測定結果をデータロガー８を介してパソコン９に入力する。 パソコン９上で測定結果を分布図に示し、間隙水圧計６の設置場所ごとの水圧測定結果から透水性を把握する。 分布図上で、間隙水圧が低くなっている区間に、亀裂１３や破砕帯の位置を特定することができる。
【００１３】
＜チ＞測定作業（非定常状態）
上記同様に注水口１０より注水加圧装置１４を用いて注水する。 孔内の水圧を任意の水圧に昇圧した後、注水を停止する。 間隙水圧計から送られる数値の経時変化を記録する。 加圧を開始後、各間隙水圧計が反応するまでの時間、圧力上昇の勾配を記録上で確認することにより、亀裂や破砕帯の位置を特定することができる。
【００１４】
＜リ＞測定例
図２に測定した例を示す。 右側の２５ｍ以深では水圧低下が見られない。 このことから２５ｍ付近に亀裂が存在していることが推測される。
【００１５】
【発明の効果】
本発明は、次のような効果を得ることができる。
＜イ＞間隙水圧計の設置場所ごとの水圧から透水性を測定し、測定結果を分布図に示すことにより、孔内の測定値の低い領域に亀裂や、破砕帯が存在することを確認できる。
＜ロ＞間隙水圧の場所ごとの測定値を知ることができるため、これを健全部における透水性との比率で表すことにより、ボーリング孔内の各区間の透水係数を知ることができる。 そのため、孔内に複数の亀裂や破砕帯が存在する場合においても、その位置を確認することができる。
【図面の簡単な説明】
【図１】 本発明の岩盤の亀裂探査装置を示す説明図。
【図２】 測定結果を示す図。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for exploring cracks in rock.
[0002]
[Prior art]
Conventionally, in order to investigate the presence of cracks and crushing zones in a drilling hole at a rock drilling site in advance, water is injected from the opening of the drilling hole with the opening sealed, and the pressure and amount of water injected at that time are measured. was there.
[0003]
[Problems to be solved by the present invention]
The conventional device for exploring cracks and crushing zones by measuring the pressure and amount of water injected into the borehole can evaluate the water permeability of the entire borehole, but it cannot identify the position of the crack or crush zone. was there.
[0004]
[Object of the present invention]
An object of the present invention is to provide a rock rock exploration device that solves the problems of the conventional configuration and that enables measurement of cracks in a borehole and the position of a fracture zone.
[0005]
[Means for Solving the Problems]
The present invention provides, as means for solving the above problems, the perforated tube in which to place the holes in the rock, a plurality of pore pressure were placed at equal intervals along the longitudinal direction of the tube in a perforated pipe meter and, a water injection pressure device for pressing injection the entire bore of rock sealing the only hole entry, the water pressure was pressure injection water throughout the water injection pressure hole I than in pressure equipment, Yes Provided is a rock mass exploration device for exploring rock mass cracks from the water pressure distribution in the borehole obtained by measuring with a plurality of pore hydrometers in the borehole.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
<A> Perforated tube The perforated tube 1 used in the present invention is a hollow cylinder and has a length equal to or greater than the depth of the borehole. The outer diameter is smaller than the inner diameter of the borehole, and the inner diameter is larger than the outer diameter of the pore water pressure gauge 6 described later. Moreover, it has the equally spaced holes 2 communicating with the inside of the tube.
[0007]
<B> A warp-shaped centrizer 5 is installed at the tip of the perforated tube. When inserting a perforated pipe into the borehole, it reduces frictional resistance caused by unevenness and bending of the hole, enabling smooth loading work.
[0008]
<C> Pore water pressure gauges The pore water pressure gauges 6 are installed at equal intervals in the perforated pipe. The pressure of water that has entered the pipe from the hole provided in the pipe can be measured for each installation location. Each pore water pressure gauge 6 is connected by a cable 7, and the measured water pressure is drawn out of the hole through the cable 7 by an electric signal.
[0009]
<D> Water inlet The water inlet 10 is located at the opening of the borehole. This is a dedicated opening for injecting water into the hole. The opening except the water inlet 10 is completely sealed before water injection.
[0010]
<E> Water injection pressure device The water injection pressure device 14 is a device that pressurizes water with a pump. The device 14 is fixed to the water inlet 10 through a water pipe. The device 14 is connected to the personal computer 9. By operating the personal computer 9, the rotation of the pump can be controlled to obtain an arbitrary injection pressure.
[0011]
<F> Signals from the data logger and the personal computer pore water pressure gauge are connected to the personal computer 9 via the data logger 8 installed outside the hole.
[0012]
<G> Measurement work (steady state)
A water injection port 10 is installed at the opening of the borehole. The opening is completely sealed 11 except for the water inlet 10. Thereafter, water 12 is poured from the water inlet 10 into the hole at a constant pressure by a known method. After confirming that the water pressure and flow rate are in a steady state, the measurement result by the pore water pressure gauge 6 is input to the personal computer 9 through the data logger 8. A measurement result is shown in a distribution chart on the personal computer 9, and water permeability is grasped from a water pressure measurement result for each installation location of the pore water pressure gauge 6. On the distribution map, the position of the crack 13 or the crushing zone can be specified in the section where the pore water pressure is low.
[0013]
<H> Measurement work (unsteady state)
In the same manner as described above, water is injected from the water injection port 10 using the water injection and pressure device 14. After increasing the water pressure in the hole to an arbitrary water pressure, water injection is stopped. Record the change over time of the numerical value sent from the pore water pressure gauge. By confirming on the record the time until each pore water pressure gauge reacts after starting pressurization and the gradient of the pressure rise, the position of the crack or crush zone can be identified.
[0014]
<Re> Measurement Example FIG. 2 shows a measurement example. There is no decrease in water pressure at a depth of 25 m or more on the right side. From this, it is presumed that a crack exists in the vicinity of 25 m.
[0015]
【The invention's effect】
The present invention can obtain the following effects.
<I> By measuring the water permeability from the water pressure at each installation location of the pore water pressure gauge and showing the measurement results in a distribution map, it can be confirmed that cracks or crushing zones exist in the low measured area in the hole. .
<B> Since the measured value for each location of the pore water pressure can be known, the permeability coefficient of each section in the borehole can be known by expressing this with the ratio of the permeability to the sound part. Therefore, even when there are a plurality of cracks or crush zones in the hole, the position can be confirmed.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory diagram showing a rock exploration device according to the present invention.
FIG. 2 is a diagram showing measurement results.

Claims (1)

岩盤の孔に配置する有孔管と、
有孔管の中に該管の長手方向に沿って等間隔に設置した複数の間隙水圧計と、
孔入口のみをシールした岩盤の孔内の全域に加圧注水する注水加圧装置とを備え、
前記注水加圧装置で以って孔内の全域に加圧注水した水圧を、有孔管内の複数の間隙水圧計で計測して得た孔内の水圧分布から岩盤の亀裂を探査する、
岩盤の亀裂探査装置。 A perforated tube in which to place the holes in the rock,
A plurality of pore pressure meter installed at regular intervals along the longitudinal direction of the tube in a perforated pipe,
And a water injection pressure device for pressurizing the water injection the hole entry only the entire area within the pores of the sealed rock,
Exploring cracks in the bedrock from the water pressure distribution in the hole obtained by measuring the water pressure pressurized and injected over the entire area in the hole with the water injection pressure device, measured by a plurality of pore water pressure gauges in the perforated pipe ,
Rock bed crack exploration equipment.
JP20935399A 1999-07-23 1999-07-23 Rock bed crack exploration system Expired - Fee Related JP4139007B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20935399A JP4139007B2 (en) 1999-07-23 1999-07-23 Rock bed crack exploration system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20935399A JP4139007B2 (en) 1999-07-23 1999-07-23 Rock bed crack exploration system

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JP2001032251A JP2001032251A (en) 2001-02-06
JP4139007B2 true JP4139007B2 (en) 2008-08-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5191009B2 (en) * 2010-01-27 2013-04-24 応用地質株式会社 Method of investigating cracks on the dike surface
CN106149771B (en) * 2016-07-01 2020-04-24 中国电力科学研究院 Method and device for constructing foundation crack diagram of weathered rock foundation
CN113219141B (en) * 2021-06-01 2023-03-14 盾构及掘进技术国家重点实验室 Grooved pipe device for micro-fracture development characteristics in tunnel surrounding rock and monitoring method

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