JPH01182734A - Apparatus for testing water permeability - Google Patents

Apparatus for testing water permeability

Info

Publication number
JPH01182734A
JPH01182734A JP646288A JP646288A JPH01182734A JP H01182734 A JPH01182734 A JP H01182734A JP 646288 A JP646288 A JP 646288A JP 646288 A JP646288 A JP 646288A JP H01182734 A JPH01182734 A JP H01182734A
Authority
JP
Japan
Prior art keywords
test
water
test section
ground
pressure
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
Application number
JP646288A
Other languages
Japanese (ja)
Other versions
JPH0657933B2 (en
Inventor
Yasutaka Terado
寺戸 康隆
Tetsumi Fujii
藤井 徹美
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eneos Corp
Original Assignee
Nippon Petrochemicals Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Petrochemicals Co Ltd filed Critical Nippon Petrochemicals Co Ltd
Priority to JP646288A priority Critical patent/JPH0657933B2/en
Publication of JPH01182734A publication Critical patent/JPH01182734A/en
Publication of JPH0657933B2 publication Critical patent/JPH0657933B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

PURPOSE:To obtain a lugeon value inherent to the ground regardless of ground water even if the limit pressure of the ground to be tested is small, by adjusting the flow rate of fluid into an injecting pipe so that a liquid level for a test water head becomes a preset level determined with a level sensor. CONSTITUTION:An air packer 10 forms a permeability testing section (a) in a test hole 2, which is formed by boring the ground. An injecting pipe 12 is inserted into the test hole 2 so that the pipe 12 is communicated to the test section through the packer 10. Liquid is supplied into the test section. A level sensor 19 is arranged along the injecting pipe 12 so that the sensor 19 can be moved up and down. The liquid level for a test water head (b), which acts in the test section, is detected. A water injecting hose 14 is inserted into the injecting pipe 12. Water in a storage tank 17 is injected into the test section through a flowmeter 15 and a flow rate regulating valve 16. The flow rate of the fluid into the injecting pipe 12 is controlled through the valve 16 so that the preset liquid level becomes constant. The test water head in the test section is made constant. The injecting pressure is detected with a pressure sensor 22 and displayed on a measuring device 21 together with the flow rate.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ダム等の地質調査、基礎グラウチング効果判
定などに適用される静水圧式の透水試験装置に関し、特
にボアホールを利用し、その中に静水圧をかけて地盤の
透水性を調べる透水試験装置に関する。
[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hydrostatic permeability test device that is applied to geological surveys of dams, etc., basic grouting effect evaluation, etc. This relates to a permeability test device that applies hydrostatic pressure to examine the permeability of the ground.

〔従来の技術〕[Conventional technology]

透水試験(ルジオンテスト)の目的は、ダムの基礎地盤
の透水性を評価するために行なうものである。    
              −ダムの基礎地盤牟ヤの
漏水は貯水効率を低下させるだけでなく、基礎及び麦作
の安全にかかわる重要な問題である。従ってダム建設に
際しては、基礎地盤の透水性を把握する必要があり、重
要な試験項目となっている。また、ルジオンテストによ
り評価された透水性等は、ダムの建設位置の選定、掘削
線の決定、グラウチングの計画及びグラウチングの結果
の判定等にも利用されている。
The purpose of the permeability test (Lugeon test) is to evaluate the permeability of the foundation ground of a dam.
-Water leakage from dam foundations not only reduces water storage efficiency, but is also an important problem that affects the safety of foundations and wheat cultivation. Therefore, when constructing a dam, it is necessary to understand the permeability of the foundation ground, which is an important test item. In addition, the permeability and other properties evaluated by the Lugeon test are used to select the location for dam construction, determine excavation lines, plan grouting, and judge the results of grouting.

従来、上述のような目的に適用される透水試験装置とし
ては、第2図に示す方式のものが知られている。
BACKGROUND ART Conventionally, a system shown in FIG. 2 has been known as a water permeability test device applied to the above-mentioned purpose.

図において、地盤1.に清水掘により必要深さの試験孔
(孔径は原則午して6.6ms+)2を垂直に掘削し、
この試験孔2内には、その孔口から試験区間(5m程度
)に達する注入管3を挿入し、二の注入管3の下端部外
周を試験孔2の内壁間にエアパツカー4を介在すること
で試験区間の止水を行なう。
In the figure, ground 1. 2 test holes of the required depth (hole diameter is 6.6 ms + in principle) are vertically excavated using Shimizu drilling.
An injection pipe 3 is inserted into the test hole 2 from the hole opening to the test section (approximately 5 m), and an air packer 4 is interposed between the outer periphery of the lower end of the second injection pipe 3 and the inner wall of the test hole 2. Water in the test section will be shut off.

また、試験孔2から地上に突出する注入管3の上端には
、自記記録可能な流量計5及びバルブ6を介してポンプ
7が接続されていると共に、注入圧力を自記記録できる
圧力計8が接続されている。
In addition, a pump 7 is connected to the upper end of the injection pipe 3 that protrudes above the ground from the test hole 2 via a flowmeter 5 and a valve 6 that can record the injection pressure, as well as a pressure gauge 8 that can record the injection pressure. It is connected.

上記樽成の透水試験装置において、その透水試験(ルジ
オンテスト)に際しては、ポンプ7を駆動し、パルプ6
を開いて水を注入管3から試験孔2の試験区間内に注入
して圧力水、即ち注入圧力を試験区間にかけ、定水圧状
態にして試験区間の透水試験を行なう。
In the water permeability testing device mentioned above, during the water permeability test (Lugeon test), the pump 7 is driven and the pulp 6
After opening, water is injected from the injection pipe 3 into the test section of the test hole 2, pressure water, that is, injection pressure is applied to the test section, and a water permeability test is conducted in the test section under a constant water pressure state.

この際、試験区間に作用する有効注入圧力Pは次式によ
って表される。
At this time, the effective injection pressure P acting on the test section is expressed by the following equation.

P=Pa+rw(hI−hz−hs) (kgf/d)
但し、Po :注入管の口元圧力 hI :圧力計から試験区間の中央までの標高差(m) h3 :地下水位りから試験区間の中央までの水頭(m
) h3 :注入管内抵抗による損失水頭(m)T−:水の
単位体積重量 このようにポンプ7を駆動することにより試験区間に対
し注入圧力を地上からかけ、かつその圧力を低圧から高
圧へと段階的に移行し、その都度定水位状態にして、試
験区間の透水試験を行ない、その試験結果から第3図に
示すような試験区間の注入圧カー注入量曲線を作成し、
この注入圧カー注入量曲線からルジオン値Luを求める
。このルジオン値は、注入圧力が10kgf/c1*”
の場合の注入量をいう。また、上記曲線は、ルジオン値
を求めるだけでなく、限界圧力を求めたり、地盤の透水
特性や試験の信顛性を知るうえで重要な資料となる。
P=Pa+rw(hI-hz-hs) (kgf/d)
However, Po: Pressure at the mouth of the injection pipe hI: Difference in altitude from the pressure gauge to the center of the test section (m) h3: Water head from the groundwater level to the center of the test section (m)
) h3: Head loss due to resistance inside the injection pipe (m) T-: Unit volume weight of water By driving the pump 7 in this way, injection pressure is applied to the test section from the ground, and the pressure is changed from low pressure to high pressure. The transition was carried out step by step, and a water permeability test was carried out in the test section each time with a constant water level condition. From the test results, an injection pressure car injection amount curve for the test section as shown in Figure 3 was created.
The Lugeon value Lu is determined from this injection pressure Kerr injection amount curve. This Lugeon value indicates that the injection pressure is 10 kgf/c1*”
This refers to the injection amount in the case of In addition, the above curve is an important document not only for determining the Lugeon value but also for determining the critical pressure and knowing the permeability characteristics of the ground and the reliability of the test.

限界圧力は、注入圧カー注入量曲線において、注入量が
急増する点の注入力を言い、これは圧力水によって地盤
の割れ目を充填している細粒分が流れたり、地盤の割れ
目が拡大したりする時に生じる現象であり、地盤の透水
特性を知り、グラウチングの注入圧力を決定するうえで
重要な指標となる。
Critical pressure refers to the injection force at the point on the injection pressure Kerr injection rate curve where the injection rate suddenly increases. This is a phenomenon that occurs when the grouting occurs, and is an important indicator for understanding the permeability characteristics of the ground and determining the injection pressure for grouting.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の透水試験装置では、ポンプ7を使用して
地上から圧力を段階的にかけて試験を行なうものである
ため、地下水位が低い場合には、試験区間にかかる全水
圧の中に地表面から地下水位りまでの静水頭が含まれて
おり、こめため、ポンプによる水圧がOであっても上記
静水頭がブリプレッシャとして試験区間に作用してしま
い、この静水頭より低い段階から透水試験を行なうこと
ができない。
In the conventional water permeability test equipment described above, the pump 7 is used to apply pressure from the ground in stages to perform the test. Therefore, when the groundwater level is low, some water from the ground surface is included in the total water pressure applied to the test section. The hydrostatic head up to the groundwater level is included, and even if the water pressure from the reservoir or pump is O, the above hydrostatic head will act on the test section as burr pressure, and the permeability test should be performed from a stage lower than this hydrostatic head. I can't do it.

また、一般に、透水試験は地盤の限界圧力(耐水圧性)
以下での地盤のルジオン値あるいは透水係数を求めるこ
とを目的としているものであるから、対象となる地盤(
地質)の限界圧力が前記地表面から地下水位りまでの静
水頭より小さい場合は、ブリプレッシャ段階で試験圧力
が地盤の限界圧力を上回って地盤を降伏させ、地盤固有
の正し゛いルジオン値あるいは透水係数を求めることが
できない問題があった。
Additionally, in general, water permeability tests are conducted to determine the limit pressure (water pressure resistance) of the ground.
Since the purpose is to obtain the Lugeon value or permeability coefficient of the ground in the following, the target ground (
If the critical pressure of the ground (geological) is smaller than the hydrostatic head from the ground surface to the groundwater level, the test pressure exceeds the critical pressure of the ground in the buri pressure stage, causing the ground to yield, and the correct lugeon value or permeability inherent to the ground is determined. There was a problem that the coefficients could not be calculated.

本発明は上記問題を解決したもので、試験対象地盤の限
界圧力が小さい場合でも地下水位に関係な(地盤固有の
ルジオン値を正確に求めることができる透水試験装置を
提供することを目的とする。
The present invention has solved the above problems, and aims to provide a permeability testing device that can accurately determine the Lugeon value (specific to the ground) related to the groundwater level even when the critical pressure of the ground to be tested is small. .

〔課題を解決するための手段〕[Means to solve the problem]

本発明の透水試験装置は、地盤にボーリングした試験孔
内に透水試験区間を形成するためのパッカーと、前記試
験孔内に前記パッカーを通して試験区間と連゛通ずるよ
う挿入され試験区間に液体を供給する注入管と、この注
入管内に沿って上下動可能に配置され試験区間に作用す
る試験水頭用の液体レベルを検出するレベルセンサと、
このレベルセンサにより設定された液体レベルが一定と
なるよう注入管への流体流量を制御して試験区間への試
験水頭を一定にする液体流量調整弁手段とを備えてなる
ものである。
The permeability test device of the present invention includes a packer for forming a permeability test section in a test hole bored in the ground, and a packer inserted into the test hole so as to communicate with the test section through the packer to supply liquid to the test section. a level sensor arranged vertically movably along the injection pipe to detect a liquid level for a test water head acting on a test section;
The apparatus is equipped with a liquid flow rate regulating valve means for controlling the fluid flow rate to the injection pipe so that the liquid level set by the level sensor is constant, thereby making the test water head to the test section constant.

〔作 用〕[For production]

本発明においては、試験区間に作用する注入圧力を得る
ための液体レベルをレベルセンサで検出し、この液体レ
ベルがレベルセンサによる設定レベルになるよう流量調
整弁手段を調整するから、孔内で得られる静水頭により
試験区間の透水試験が可能となり、かつ試験地盤の限界
圧力が小さい場合でも地下水位に関係なく地盤固有のル
ジオン値を正確に求め得る。
In the present invention, the liquid level for obtaining the injection pressure acting on the test section is detected by a level sensor, and the flow rate regulating valve means is adjusted so that this liquid level reaches the level set by the level sensor. The hydrostatic head generated by the method enables permeability testing in the test section, and even when the critical pressure of the test ground is small, the Lugeon value specific to the ground can be accurately determined regardless of the groundwater level.

〔実施例〕〔Example〕

以下、本発明の実施例を図面について説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第1図は本発明方式を適用した透水試験装置の一例を示
す概略構成図である。
FIG. 1 is a schematic diagram showing an example of a water permeability test apparatus to which the method of the present invention is applied.

図において、対象地盤lには、清水掘等により必要深さ
の試験孔(孔径は66mm)2が垂直にボーリングされ
ている。試験孔2内の下端部には試験区間(5m程度)
が設定され、この試験区間の上端に位置する試験孔2内
には、上方への止水を行なうエアパツカー10が設置さ
れている。エアパツカーlOには、パッカー用エアチュ
ーブ11の一端が接続され、他端側は地上に設置される
コンプレッサ等のエア源(図示せず)に接続され、この
エア源からエアパツカー10にエアを供給して膨張させ
ることにより試験区間を非試験区域と隔絶するようにな
っている。
In the figure, a test hole 2 of the required depth (hole diameter: 66 mm) is vertically bored in the target ground l by clear water drilling or the like. There is a test section (approximately 5m) at the lower end of test hole 2.
is set, and an air packer 10 is installed in the test hole 2 located at the upper end of this test section to shut off water upward. One end of the packer air tube 11 is connected to the air packer IO, and the other end is connected to an air source (not shown) such as a compressor installed on the ground, and air is supplied to the air packer 10 from this air source. The test area is separated from the non-test area by inflating the test area.

前記試験孔2内には、地上から前記エアパツカー10に
達する注入管(外径44.5m、内径34.9ma+)
12が挿入設置され、その下端に連結したレジューサ1
3がエアパツカー10を貫通して試験区間に連通されて
いると共に、注入管12内には、シンフレックス注入ホ
ース14が挿入され、その−端はレジューサ13に近接
する位置まで達しており、そして地上への突出端は、流
量計15及び手動式の流量調整バルブ16を介して貯留
タンク17に接続され、貯留タンク17にはバルブ18
を介して図示しない水源から水が供給されるようになっ
ている。また、注入管12内には、注水ホース14を通
して供給される静水圧用の水のレベルを検出するレベル
センサ19が配置され、このレベルセンサ19は、これ
に接続した信号ケーブル20によって注入管12の上方
から吊下状態に支持され、ケーブル20の地上端側は計
測器21に接続されている。
Inside the test hole 2, there is an injection pipe (outer diameter 44.5 m, inner diameter 34.9 m+) that reaches the air packer 10 from the ground.
12 is inserted and installed, and the reducer 1 is connected to its lower end.
3 passes through the air packer 10 and communicates with the test section, and a Synflex injection hose 14 is inserted into the injection pipe 12, the lower end of which reaches a position close to the reducer 13, and is connected to the ground. The protruding end is connected to a storage tank 17 via a flow meter 15 and a manual flow rate adjustment valve 16, and a valve 18 is connected to the storage tank 17.
Water is supplied from a water source (not shown) through the system. Further, a level sensor 19 is disposed within the injection pipe 12 to detect the level of water for hydrostatic pressure supplied through the water injection hose 14, and this level sensor 19 is connected to the injection pipe 12 by a signal cable 20 connected thereto. The cable 20 is suspended from above, and the ground end side of the cable 20 is connected to a measuring instrument 21 .

前記試験区間内には、その中間位置の有効注入圧力を検
出する圧力センサ22が配置され、この圧力センサ22
は、これに接続した信号ケーブル23によって注入管1
2の上方から吊下状態に支持され、そしてケーブル23
の地上端側は計測器21に接続されている。24は前記
レベルセンサ19及び圧力センサ22の検出値を記録す
る記録計である。なお、本実施例の場合の地下水位WL
は試験孔2の下方にあるとする。
A pressure sensor 22 for detecting the effective injection pressure at an intermediate position is disposed within the test section, and this pressure sensor 22
is connected to the injection pipe 1 by the signal cable 23 connected to it.
The cable 23 is supported in a suspended state from above the cable 23.
The ground end side of is connected to a measuring instrument 21. A recorder 24 records the detected values of the level sensor 19 and pressure sensor 22. In addition, the groundwater level WL in the case of this example
is located below test hole 2.

次に、上述のように構成された本実施例の透水試験装置
による試験動作について説明する。
Next, a test operation using the water permeability test apparatus of this embodiment configured as described above will be explained.

透水試験に際しては、エアパツカー10.注入管12及
び注水ホース14を第1図に示す状態に設置する。
For the water permeability test, use Air Packer 10. The injection pipe 12 and water injection hose 14 are installed in the state shown in FIG.

次に試験区間を透水試験水頭が0となるレベルから試験
する場合は、レベルセンサ19を仮想線に示す如く圧力
センサ22と一致する試験区間の中央部分まで下降させ
、さらに圧力センサ22を試験区間の中央部分に吊下げ
保持する。
Next, when testing the test section from the level at which the water permeability test water head is 0, lower the level sensor 19 to the center of the test section where it coincides with the pressure sensor 22, as shown by the imaginary line, and then move the pressure sensor 22 to the test section. Suspend and hold from the center of the

かかる状態で、水源バルブ18を開いて貯留タンク17
内に注水すると共に、流量調整バルブ16を開き、貯留
タンク17内の水を注入ホース14を通して試験区間内
に注入する。この時、試験区間内に注入された水位がレ
ベルセンサ19に達し、該レベルセンサ19が水位を検
出すると、その水位信号はケーブル20を通して計測器
21に供給され、現在の水位を計測器21の水位表示計
21aに表示する。従って作業者は、試験区間から漏れ
る水量をカバーして試験区間内の水位がレベルセンサ1
9により設定された試験水頭(=0)のところで一定と
なるよう流量調整バルブ16を調節する。そして、水位
が一定になったことを水位表示計21aを見ながら確認
し、その時の注入圧力と流量を記録計24により記録す
る。なお、注入圧力は圧力センサ22により検出される
と共に、その検出信号をケーブル23を通して計測器2
1に加えることにより圧力表示計21bに表示される。
In this state, open the water source valve 18 and open the storage tank 17.
At the same time, the flow rate adjustment valve 16 is opened, and the water in the storage tank 17 is injected into the test section through the injection hose 14. At this time, when the water level injected into the test section reaches the level sensor 19 and the level sensor 19 detects the water level, the water level signal is supplied to the measuring device 21 through the cable 20, and the current water level is detected by the measuring device 21. It is displayed on the water level indicator 21a. Therefore, the operator must check the level sensor 1 to ensure that the water level in the test section covers the amount of water leaking from the test section.
The flow rate adjustment valve 16 is adjusted so that the flow rate becomes constant at the test head (=0) set by 9. Then, confirm that the water level has become constant while looking at the water level indicator 21a, and record the injection pressure and flow rate at that time using the recorder 24. Note that the injection pressure is detected by the pressure sensor 22, and the detection signal is sent to the measuring device 2 through the cable 23.
1 is displayed on the pressure indicator 21b.

試験水頭=0での透水試験が終了したならば、レベルセ
ンサ19を、例えば水頭が1.3,5゜7.10mと言
うように段階的に上昇させ、その都度、上述する定水位
状態にして、その時の圧力及び流量を測定、記録する。
When the water permeability test with the test water head = 0 is completed, the level sensor 19 is raised stepwise, for example, to a water head of 1.3.5° to 7.10 m, each time returning to the constant water level state described above. Measure and record the pressure and flow rate at that time.

試験区間に対する各水頭レベルでの試験が全て終了した
ならば、注入圧カー単位注入流量曲線(第3図に示すも
のと同様な曲線)を作成し、このグラフから従来と同様
にして限界圧力とルジオン値を求める。
Once all tests have been completed at each head level for the test section, create an injection pressure car unit injection flow rate curve (a curve similar to the one shown in Figure 3), and use this graph to determine the limit pressure and pressure in the same way as before. Find the Lugeon value.

上述のような本実施例にあっては、孔内のみで、試験区
間に対する静水頭を発生させる試験方式であるため、地
下水位に関係なくOの水頭からでも試験区間の透水試験
を行なうことができ、これに伴い対象となる地盤(地質
)の限界圧力が地表面から地下水位までの静水頭より小
さい場合でも地盤固有の正しいルジオン値及び限界圧力
を求めることができる。
In this example as described above, the test method is to generate a hydrostatic head for the test section only inside the hole, so it is possible to conduct a permeability test for the test section even from a water head of O regardless of the groundwater level. Accordingly, even if the critical pressure of the target ground (geology) is smaller than the hydrostatic head from the ground surface to the groundwater level, the correct Lugeon value and critical pressure specific to the ground can be determined.

また、圧力センサ22を挿入することにより、試験区間
の実圧を測定できると共に、有効注入圧力も求めること
ができ、さらにレベルセンサ19を地下水位の測定手段
とすることができる(地下水位が試験区間以浅にある場
合は、圧力センサ22とレベルセンサ19の両者の値に
よって有効注入圧力を求めることができる。)。
In addition, by inserting the pressure sensor 22, the actual pressure in the test section can be measured, and the effective injection pressure can also be determined.Furthermore, the level sensor 19 can be used as a means for measuring the groundwater level (the groundwater level is If it is shallower than the section, the effective injection pressure can be determined from the values of both the pressure sensor 22 and the level sensor 19.)

なお、上記実施例では、試験区間の注入圧力発生に水を
利用した場合について述べたが、水以外の泥水、その他
の粘性の高い液体を用いれば、試験に際しての液体使用
量が少なくて済み、水の便の悪い場所での地盤調査に好
適となる。
In addition, in the above example, a case was described in which water was used to generate injection pressure in the test section, but if muddy water or other highly viscous liquid other than water is used, the amount of liquid used during the test can be reduced. Suitable for ground investigation in places with poor access to water.

また、上記実施例では、流!調整バルブを手動で操作す
る場合について述べたが、電動式流量調整弁などを用い
ることにより定水位を自動制御できるようにしても良い
。また、流量調整バルブは注水ホース12の下端に設け
るようにしても良い。
Moreover, in the above embodiment, flow! Although the case where the adjustment valve is manually operated has been described, it is also possible to automatically control the constant water level by using an electric flow rate adjustment valve or the like. Further, the flow rate adjustment valve may be provided at the lower end of the water injection hose 12.

〔発明の効果〕〔Effect of the invention〕

以上のように、本発明によれば、所定深さ番こボーリン
グした試験孔内の試験区間の上端にバッカー及び注入管
を挿入、設置し、そして試験区間に作用する試験水頭用
の液体レベルを検出するレベルセンサを注入管内に沿っ
て上下動可能に配置すると共に試験区間の注入圧力を検
出する圧力センサを設け、さらにレベルセンサにより設
定された液体レベルが一定になるよう注入管への液体流
量を制御して試験区間への試験水頭を一定にする液体流
量調整弁手段を液体供給路に設けてなるものであるから
、地下水位に関係なく、0の水頭からでも試験区間の透
水試験が可能になり、これに伴い試験対象となる地盤の
限界圧力が小さい場合でも地盤固有のルジオン値を正確
に求めることができる効果がある。
As described above, according to the present invention, a backer and an injection pipe are inserted and installed at the upper end of a test section in a test hole drilled to a predetermined depth, and the liquid level for the test water head acting on the test section is adjusted. A level sensor for detection is arranged so as to be movable up and down along the injection pipe, and a pressure sensor is provided to detect the injection pressure in the test section.Furthermore, the liquid flow rate to the injection pipe is adjusted so that the liquid level set by the level sensor is constant. Since the liquid supply path is equipped with a liquid flow rate regulating valve means to control the test water head to a constant level in the test section, it is possible to perform a water permeability test in the test section even from a water head of 0, regardless of the groundwater level. Therefore, even if the critical pressure of the ground to be tested is small, it is possible to accurately determine the Lugeon value specific to the ground.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の透水試験装置の一例を示す概略構成図
、第2図は従来の透水試験装置の概略構成図、第3図は
注入圧力と注入量の関係を示すグラフである。 l・・・・・・地盤 2・・・・・・試験孔 10・・・・・・エアパッカj 12・・・・・・注入管 14・・・・・・注入ホース 15・・・・・・流量計 16・・・・・・流量調整バルブ 17・・・・・・貯留タンク 19・・・・・・レベルセンサ 21・・・・・・計測器 22・・・・・・圧力センサ 24・・・・・・記録計。
FIG. 1 is a schematic configuration diagram showing an example of a water permeability testing device of the present invention, FIG. 2 is a schematic diagram of a conventional water permeability testing device, and FIG. 3 is a graph showing the relationship between injection pressure and injection amount. l...Ground 2...Test hole 10...Air packer j 12...Injection pipe 14...Injection hose 15...・Flow meter 16...Flow rate adjustment valve 17...Storage tank 19...Level sensor 21...Measuring instrument 22...Pressure sensor 24 ...Recorder.

Claims (1)

【特許請求の範囲】[Claims] (1)地盤にボーリングした試験孔内に透水試験区間を
形成するためのパッカーと、前記試験孔内に前記パッカ
ーを通して試験区間と連通するよう挿入され試験区間に
液体を供給する注入管と、この注入管内に沿って上下動
可能に配置され試験区間に作用する試験水頭用の液体レ
ベルを検出するレベルセンサと、このレベルセンサによ
り設定された液体レベルが一定となるよう注入管への流
体流量を制御して試験区間への試験水頭を一定にする液
体流量調整弁手段とを備えてなる透水試験装置。
(1) A packer for forming a permeability test section in a test hole bored in the ground, an injection pipe inserted into the test hole so as to communicate with the test section through the packer, and supplying liquid to the test section; A level sensor is arranged to be movable up and down along the injection pipe and detects the liquid level for the test water head acting on the test section, and the fluid flow rate to the injection pipe is controlled so that the liquid level set by this level sensor is constant. A water permeability test device comprising a liquid flow rate regulating valve means to control and maintain a constant test water head to a test section.
JP646288A 1988-01-14 1988-01-14 Water permeability test equipment Expired - Lifetime JPH0657933B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP646288A JPH0657933B2 (en) 1988-01-14 1988-01-14 Water permeability test equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP646288A JPH0657933B2 (en) 1988-01-14 1988-01-14 Water permeability test equipment

Publications (2)

Publication Number Publication Date
JPH01182734A true JPH01182734A (en) 1989-07-20
JPH0657933B2 JPH0657933B2 (en) 1994-08-03

Family

ID=11639109

Family Applications (1)

Application Number Title Priority Date Filing Date
JP646288A Expired - Lifetime JPH0657933B2 (en) 1988-01-14 1988-01-14 Water permeability test equipment

Country Status (1)

Country Link
JP (1) JPH0657933B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680279A (en) * 2017-01-20 2017-05-17 延安市禾草沟煤业有限公司 Method and device for detecting fissure zone produced after directional blasting
CN110907610A (en) * 2019-12-24 2020-03-24 湖南理工学院 Detection equipment and detection method for compactness of rolled laminated structure
CN111453792A (en) * 2020-05-09 2020-07-28 深圳市清研环境科技有限公司 Reflux bucket

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106680279A (en) * 2017-01-20 2017-05-17 延安市禾草沟煤业有限公司 Method and device for detecting fissure zone produced after directional blasting
CN110907610A (en) * 2019-12-24 2020-03-24 湖南理工学院 Detection equipment and detection method for compactness of rolled laminated structure
CN111453792A (en) * 2020-05-09 2020-07-28 深圳市清研环境科技有限公司 Reflux bucket

Also Published As

Publication number Publication date
JPH0657933B2 (en) 1994-08-03

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