JPH0657934B2 - Water permeability test equipment - Google Patents
Water permeability test equipmentInfo
- Publication number
- JPH0657934B2 JPH0657934B2 JP646388A JP646388A JPH0657934B2 JP H0657934 B2 JPH0657934 B2 JP H0657934B2 JP 646388 A JP646388 A JP 646388A JP 646388 A JP646388 A JP 646388A JP H0657934 B2 JPH0657934 B2 JP H0657934B2
- Authority
- JP
- Japan
- Prior art keywords
- test
- water
- pressure
- ground
- injection
- 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 - Fee Related
Links
- 238000011041 water permeability test Methods 0.000 title description 12
- 238000002347 injection Methods 0.000 claims description 55
- 239000007924 injection Substances 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000007788 liquid Substances 0.000 claims description 16
- 230000035699 permeability Effects 0.000 description 15
- 239000003673 groundwater Substances 0.000 description 10
- 230000002706 hydrostatic effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- -1 that is Substances 0.000 description 1
- 239000008215 water for injection Substances 0.000 description 1
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
に試験孔（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 field of application] The present invention relates to a hydrostatic pressure type water permeability test apparatus applied to geological surveys of dams and the like, and determination of basic grouting effect, and in particular uses a test hole (bore hole). The present invention relates to a water permeability test apparatus for examining the water permeability of the ground by applying hydrostatic pressure therein.
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。The purpose of the permeability test (Lugeon test) is to evaluate the permeability of the foundation ground of the dam.
ダムの基礎地盤からの漏水は貯水効率を低下させるだけ
でなく、基礎及び堤体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。Leakage from the dam's foundation ground not only reduces water storage efficiency, but is also an important issue regarding the safety of foundations and dams. Therefore, when constructing a dam, it is necessary to grasp the permeability of the foundation ground, which is an important test item. Further, the water permeability evaluated by the Lugeon test is also used for selecting the construction position of the dam, determining the excavation line, planning the grouting, and judging the result of the 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。2. Description of the Related Art Conventionally, as the water permeability test apparatus applied to the above purpose, the system shown in FIG. 2 is known.
第２図において、地盤１に清水掘により必要深さの試験
孔（孔径は原則として６６mm）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、この注入管３の下端部外周と
試験孔２の内壁間にエアパッカーを介在することで試験
区間の止水を行なう。In Fig. 2, a test hole (hole diameter is 66 mm in principle) 2 with a required depth is vertically excavated in the ground 1 by clear water digging, and in this test hole 2, a test section (about 5 m) is formed from the hole opening. The water is stopped in the test section by inserting the reaching injection pipe 3 and interposing an air packer between the outer periphery of the lower end of the injection pipe 3 and the inner wall of the test hole 2.
また、試験孔２から地上に突出する注入管３の上端に
は、注入水量を表示する流量計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（口元圧
力）を表示する圧力計８が接続されている。A pump 7 is connected to the upper end of the injection pipe 3 protruding from the test hole 2 to the ground via a flow meter 5 for displaying the amount of injected water and a valve 6, and the injection pressure (oral pressure) is displayed. The pressure gauge 8 is connected.
上記構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、バルブ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 permeation test apparatus having the above-described structure, the water permeation test (Lugeon test) is performed by driving the pump 7 and the valve 6
Is opened to inject water from the injection pipe 3 into the test section of the test hole 2, and pressurized water, that is, injection pressure is applied to the test section to make a constant water pressure state, and a water permeability test of the test section is performed.
この時、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＝Ｐ＝P0＋γｗ（h1−h2−h3）（kgf／cm2） 但し、P0：注入管の口元圧力 h1：圧力計から試験区間の中央までの標高差（ｍ） h2：地下水位Ｌ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） γｗ：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
ように試験区間の注入圧力−注入量曲線を作成し、この
注入圧力−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／cm2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
頼性を知るうえで重要な資料となる。P = P = P 0 + γw (h 1 −h 2 −h 3 ) (kgf / cm 2 ) where P 0 : pressure at the mouth of the injection pipe h 1 : elevation difference from the pressure gauge to the center of the test section (m) h 2 : Head of water from the groundwater level L to the center of the test section (m) h 3 : Head of loss due to resistance in the injection pipe (m) γw: Unit volume weight of water Injection into the test section by driving the pump 7 in this way Pressure is applied from the ground, and the pressure is gradually changed from low pressure to high pressure, and a constant water level is maintained at each time, and a permeability test is conducted in the test section. From the test results, the test section is shown in Fig. 3. injection pressure - created injection volume curve, the injection pressure - Request Lugeon value L u from injection volume curve. This Lugeon value refers to the injection amount when the injection pressure is 10 kgf / cm 2 . Further, the above-mentioned curve is an important material not only for obtaining the Lugeon value but also for obtaining the limit pressure, and for knowing the water permeability characteristics of the ground and the reliability of the test.
限界圧力は、注入圧力−注入量曲線において、注入量が
急増する点の注入圧力を言い、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。The limit pressure is the injection pressure at the point where the injection amount suddenly increases in the injection pressure-injection amount curve.This is because the fine particles filling the cracks in the ground flow or the cracks in the ground expand due to the pressure water. It is a phenomenon that occurs when the grouting is performed, and it is an important index for knowing the water permeability characteristics of the ground and determining the grouting injection pressure.
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Ｌまでの静水頭が含まれて
おり、このため、ポンプによる水圧が０であっても上記
静水頭がプ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 above-described conventional water permeability test apparatus, the pump 7 is used to perform a stepwise test of pressure from the ground, so when the groundwater level is low, the total water pressure applied to the test section will be reduced from the ground surface. The hydrostatic head up to the groundwater level L is included. Therefore, even if the water pressure by the pump is 0, the hydrostatic head acts on the test section as pre-pressure, and the permeability test is started 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Ｌまでの
静水頭より小さい場合は、プ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。In general, the permeability test is the limit pressure of the ground (water pressure resistance).
Since the purpose is to obtain the Lugeon value or permeability of the ground below, if the critical pressure of the target ground (geology) is smaller than the hydrostatic head from the ground surface to the groundwater level L, In the pressure stage, the test pressure exceeded the critical pressure of the ground and yielded the ground, and there was a problem that the correct Lugeon value or hydraulic conductivity peculiar to the ground could not be obtained.
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く地盤固有の
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 solves the above problem, and an object of the present invention is to provide a water permeability test apparatus that can accurately determine the Lugeon value peculiar to the ground regardless of the groundwater level even when the critical pressure of the test ground is small.
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するよう
に挿入され試験区間に液体を供給する注入管と、注入液
体を貯留する密閉タンクと、この密閉タンクの底部と前
記注入管内間を連通する液体供給管と、一端が前記密閉
タンクの上部と連通され他端部が前記注入管内に上下動
可能に挿入されると共に試験区間への試験水頭が一定に
なるよう注入管内の液体レベルを一定に制御する液体レ
ベル設定用給気ホースとを備えてなるものである。The water permeation test apparatus of the present invention is a packer for forming a water permeation test section in a test hole bored in the ground, and is inserted into the test hole so as to communicate with the test section through the packer and supplies a liquid to the test section. An injection pipe, a closed tank for storing the injection liquid, a liquid supply pipe that communicates between the bottom of the closed tank and the inside of the injection pipe, one end communicates with the upper part of the closed tank, and the other end is inside the injection pipe. A liquid level setting air supply hose that is vertically movably inserted and that controls the liquid level in the injection pipe to a constant level so that the test head to the test section is constant.
本発明においては、試験区間に作用する注入圧力を得る
ための液体レベルが、地上の密閉タンクと、これに接続
され注入管内に挿入された供給管と給気ホースとにより
一定になるよう制御され、一定の水頭を維持しながら透
水量とバランスした流量を供給できるようになるから、
孔内で得られる静水頭で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 controlled to be constant by the above-ground closed tank and the supply pipe and the air supply hose connected to the tank and inserted into the injection pipe. , Because it becomes possible to supply a flow rate that is balanced with the water permeability while maintaining a constant head of water.
With the hydrostatic head obtained in the hole, the permeability test of the test section becomes possible, and even if the critical pressure of the test ground is small, the Lugeon value peculiar to the ground can be accurately obtained regardless of the groundwater level.
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 configuration 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１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ッカー１０が設置され
ている。エアパッカー１０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
ア源からエアパッカー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 (hole diameter is 66 mm) 2 having a required depth is vertically bored in the target ground 1 by a fresh water excavation or the like. A test section (about 5 m) is set at the lower end of the test hole 2, and an air packer 10 for stopping water upward is installed in the test hole 2 located at the upper end of the test section. One end of a packer air tube 11 is connected to the air packer 10, and the other end side thereof is connected to an air source (not shown) such as a compressor installed on the ground. Air is supplied from this air source to the air packer 10. The test section is isolated from the non-test section by supplying and expanding it.
前記試験孔２内には、地上から前記エアパッカー１０に
達する注入管（外径44.5mm、内径34.9mm）１２が挿入設
置され、その下端に連結したレジューサ１３がエアパッ
カー１０を貫通して試験区間に連通されている。An injection pipe (outer diameter 44.5 mm, inner diameter 34.9 mm) 12 reaching from the ground to the air packer 10 is inserted and installed in the test hole 2, and a reducer 13 connected to a lower end of the injection pipe 12 penetrates the air packer 10 to perform a test. It is connected to the section.
地上の試験孔口近傍には、注入用の水を貯留する密閉タ
ンク１４が設置され、この密閉タンク１４内には開閉バ
ルブ１５を介して水源から水が供給できるようになって
いると共に、底部には開閉バルブ１６及び流量計１７を
介して水供給管１８の一端が接続され、この供給管１８
の他端側は前記注入管１２内のレジューサ１３に近接す
る位置まで延長配置されている。また、密閉タンク１４
の上端には開閉バルブ１９を介して水位設定用の給気ホ
ース２０の一端が接続され、その他端は上下動可能に注
入管１２内に挿入されている。A closed tank 14 for storing water for injection is installed near the mouth of the test hole on the ground, and water can be supplied from a water source into the closed tank 14 through an opening / closing valve 15 and the bottom portion is provided. Is connected to one end of a water supply pipe 18 via an opening / closing valve 16 and a flow meter 17.
The other end side is extended to a position near the reducer 13 in the injection pipe 12. Also, the closed tank 14
One end of an air supply hose 20 for setting the water level is connected to the upper end of the inlet via an opening / closing valve 19, and the other end is inserted into the injection pipe 12 so as to be vertically movable.
２１は注入管１２内に配置された水位検出用のレベルセ
ンサで、このレベルセンサ２１は、これに接続した信号
ケーブル２２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２２の地上側端は計測器２３に接続
されている。また、２４は試験孔２内の試験区間の中央
部に位置して配置された注入圧力検出用の圧力センサ
で、この圧力センサ２４は、これに接続した信号ケーブ
ル２５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２５の地上側端は計測器２３に接続されて
いる。２６は前記レベルセンサ２１及び圧力センサ２４
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。Reference numeral 21 is a level sensor for detecting the water level arranged in the injection pipe 12, and the level sensor 21 is supported in a suspended state from above the injection pipe 12 by a signal cable 22 connected to the level sensor 21. The end is connected to the measuring instrument 23. Further, 24 is a pressure sensor for injecting pressure detection, which is arranged at the center of the test section in the test hole 2, and this pressure sensor 24 is connected to the pressure sensor 25 from above the injecting tube 12 by a signal cable 25. The cable 25 is supported in a suspended state, and the ground side end of the cable 25 is connected to the measuring instrument 23. 26 is the level sensor 21 and the pressure sensor 24
It is a recorder for recording the detected value of. The groundwater level WL in this example is below the 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 by the water permeation test apparatus of the present embodiment configured as described above will be described.
透水試験に際しては、エアパッカー１０，注入管１２及
び供給管１８を第１図に示す状態に設置する。In the water permeability test, the air packer 10, the injection pipe 12 and the supply pipe 18 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２１及び給気ホース２０の下
端を仮想線に示す如く圧力センサ２４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２４を試
験区間の中央部分に吊下げ保持する。Next, when the test section is tested from the level at which the water permeability test head is 0, the lower ends of the level sensor 21 and the air supply hose 20 are lowered to the central portion of the test section which coincides with the pressure sensor 24 as shown by the phantom line, Further, the pressure sensor 24 is suspended and held in the central portion of the test section.
かかる状態で、バルブ１９を開いて密閉タンク１４内の
上端を給気ホース２０を通して大気（試験孔２内）に開
放すると共に、バルブ１６を開くことにより密閉タンク
１４内の水を供給管１８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給気ホース
２０の開口を塞ぐレベルに達すると、密閉タンク１４内
の上部空間が真気圧となり、これにより試験区間への注
水はストップする。In this state, the valve 19 is opened to open the upper end of the closed tank 14 to the atmosphere (in the test hole 2) through the air supply hose 20, and the valve 16 is opened to allow the water in the closed tank 14 to pass through the supply pipe 18. Inject into test zone. At this time, when the water level injected into the test section reaches a level that closes the opening of the air supply hose 20, the upper space in the closed tank 14 becomes a true atmospheric pressure, whereby the water injection into the test section is stopped.
一方、試験区間の内面壁は透水性があるため、注入され
た水は滲透し、これに伴い水位レベルが下降して給気ホ
ース２０の下端が開口されると、再び供給管１８を通し
て注水される。これにより試験区間内の水位を給気ホー
ス２０で設定された試験水頭（＝０）のところで一定と
なるように制御することになる。この時の水位は、レベ
ルセンサ２１で検出され、その検出信号を計測器２３に
加えることにより水位表示計２３ａに表示されるから、
水位が一定になったことを水位表示計２３ａを見ながら
確認し、その時の注入圧力と流量計１７により検出され
た流量を記録計２６により記録する。また、注入圧力は
圧力センサ２４により検出されると共に、その検出信号
をケーブル２５を通して計測器２３に加えることにより
圧力表示計２３ｂに表示される。On the other hand, since the inner wall of the test section is water permeable, the injected water permeates, the water level lowers accordingly and the lower end of the air supply hose 20 is opened, and water is injected again through the supply pipe 18. It Thereby, the water level in the test section is controlled to be constant at the test head (= 0) set by the air supply hose 20. The water level at this time is detected by the level sensor 21, and the detection signal is added to the measuring instrument 23 to be displayed on the water level indicator 23a.
It is confirmed that the water level has become constant while looking at the water level indicator 23a, and the recording pressure is recorded by the recorder 26 at the injection pressure and the flow rate detected by the flow meter 17 at that time. Further, the injection pressure is detected by the pressure sensor 24, and the detection signal is applied to the measuring instrument 23 through the cable 25 and displayed on the pressure indicator 23b.
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２１及び給気ホース２０の下端開口を、例えば水頭
が１，３，５，７，１０ｍとい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 permeation test with the test head = 0 is completed, the lower end openings of the level sensor 21 and the air supply hose 20 are raised stepwise, for example, the head is 1, 3, 5, 7, 10 m, and each time. The above-mentioned constant water level state is set, and the pressure and flow rate at that time are measured and recorded.
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、注入圧力−単位注入量曲線（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。When all the tests at each head level for the test section have been completed, an injection pressure-unit injection volume curve (a curve similar to that shown in FIG. 3) is created, and from this graph, the limit pressure and Calculate 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０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 the present embodiment as described above, since the test method is to generate the hydrostatic head for the test section only within the hole, it is possible to perform the permeability test of the test section even from the head of 0 regardless of the groundwater level. , The target ground (geology)
Even if the critical pressure of is smaller than the hydrostatic head from the ground surface to the groundwater level, the correct Lugeon value and critical pressure peculiar to the ground can be obtained.
また、圧力センサ２４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、有効注水圧力も求めること
ができ、さらにレベルセンサ２１を地下水位の測定手段
とすることができる。さらにまた、密閉タンク１４を用
いた真空作用による自然現象を利用して定水位を得るよ
うにしているため、注入設備をシンプルにできる効果が
ある。In addition, by inserting the pressure sensor 24, the actual pressure in the test section can be measured, the effective water injection pressure can be obtained, and the level sensor 21 can be used as the groundwater level measuring means. Furthermore, since the constant water level is obtained by utilizing the natural phenomenon due to the vacuum action using the closed tank 14, there is an effect that the injection equipment can be simplified.
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 the above examples, the case where water was used to generate the injection pressure in the test section was described, but if muddy water other than water or other highly viscous liquid is used, the amount of liquid used in the test can be small, It is suitable for ground surveys in places with poor water access.
以上のように、本発明によれば、所定深さにボーリング
した試験孔内の試験区間の上端にパッカー及び注入管を
挿入，設置し、そして、孔口側には設置した液体貯留用
密閉タンクの底部に連通される液体供給管を注入管内に
挿入すると共に、密閉タンクの上部に連通する液体レベ
ル設定用給気ホースを注入管内に上下動可能に挿入し、
密閉タンク内に生じる真空圧作用によって試験区間に作
用する試験水頭を一定に維持しながら透水量とバランス
した流量をタイムリーに供給できるようにしたものであ
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。また、密閉タンクを用い
て、その真空作用による自然流動で定レベル制御を行な
うため、注入機構が簡単になる効果がある。As described above, according to the present invention, the packer and the injection pipe are inserted and installed at the upper end of the test section in the test hole bored to a predetermined depth, and the liquid storage closed tank is installed at the hole mouth side. Insert the liquid supply pipe that communicates with the bottom of the into the injection pipe, and insert the liquid level setting air supply hose that communicates with the top of the closed tank into the injection pipe so that it can move up and down.
It is designed to be able to supply the flow rate balanced with the permeation rate in a timely manner while maintaining the test head that acts on the test section constant due to the vacuum pressure generated in the closed tank. Permeability test of the test section is possible even from the water head, and accordingly, the Lugeon value peculiar to the ground can be accurately obtained even when the critical pressure of the ground to be tested is small. Further, since the closed tank is used to perform the constant level control by the natural flow due to the vacuum action, there is an effect that the injection mechanism is simplified.
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
は注入圧力と注入流量の関係を示すグラフである。 １……地盤 ２……試験孔 １０……エアパッカー １２……注入管 １４……密閉タンク １８……供給管 ２０……給気ホース ２１……レベルセンサ ２３……計測器 ２４……圧力センサ ２６……記録計。FIG. 1 is a schematic configuration diagram showing an example of a water permeability test apparatus of the present invention, FIG. 2 is a schematic configuration diagram of a conventional water permeability test apparatus, and FIG. 3 is a graph showing a relationship between injection pressure and injection flow rate. 1 ... Ground 2 ... Test hole 10 ... Air packer 12 ... Injection pipe 14 ... Closed tank 18 ... Supply pipe 20 ... Air supply hose 21 ... Level sensor 23 ... Measuring instrument 24 ... Pressure sensor 26 ... Recorder.
Claims (1)
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、注入液体を貯留する密
閉タンクと、この密閉タンクの底部と前記注入管内間を
連通する液体供給管と、一端が前記密閉タンクの上部と
連通され他端部が前記注入管内に上下動可能に挿入され
ると共に試験区間への試験水頭が一定になるよう注入管
内の液体レベルを一定に制御する液体レベル設定用給気
ホースとを備えてなる透水試験装置。1. A packer for forming a water permeation test section in a test hole bored in the ground, and an injection pipe inserted into the test hole so as to communicate with the test section through the packer and supplying a liquid to the test section. A closed tank for storing the injection liquid, a liquid supply pipe communicating between the bottom of the closed tank and the inside of the injection pipe, one end communicated with the upper part of the closed tank, and the other end vertically movable in the injection pipe. A water permeation test device comprising a liquid level setting air supply hose that is inserted and controls the liquid level in the injection pipe to be constant so that the test head to the test section is constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP646388A JPH0657934B2 (en) | 1988-01-14 | 1988-01-14 | Water permeability test equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP646388A JPH0657934B2 (en) | 1988-01-14 | 1988-01-14 | Water permeability test equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01182735A JPH01182735A (en) | 1989-07-20 |
| JPH0657934B2 true JPH0657934B2 (en) | 1994-08-03 |
Family
ID=11639139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP646388A Expired - Fee Related JPH0657934B2 (en) | 1988-01-14 | 1988-01-14 | Water permeability test equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0657934B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4765616B2 (en) * | 2005-12-27 | 2011-09-07 | コベルコクレーン株式会社 | Geologic exploration method and apparatus |
| JP5007378B2 (en) * | 2007-02-20 | 2012-08-22 | 鹿島建設株式会社 | Pressure control method and apparatus for underground injection |
| CN104697772B (en) * | 2015-02-13 | 2017-11-07 | 中国科学院地质与地球物理研究所 | Head experimental provision is determined in the composable water saving of one kind |
| CN105973761A (en) * | 2016-07-13 | 2016-09-28 | 游译博 | Semiautomatic diaper slippage and leakage detection device and detection method thereof |
| CN113984627B (en) * | 2021-10-30 | 2024-03-26 | 河北地质大学 | Rock stratum permeability testing device |
-
1988
- 1988-01-14 JP JP646388A patent/JPH0657934B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01182735A (en) | 1989-07-20 |
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