JPS5850215A - Permeability test at site - Google Patents
Permeability test at siteInfo
- Publication number
- JPS5850215A JPS5850215A JP14926281A JP14926281A JPS5850215A JP S5850215 A JPS5850215 A JP S5850215A JP 14926281 A JP14926281 A JP 14926281A JP 14926281 A JP14926281 A JP 14926281A JP S5850215 A JPS5850215 A JP S5850215A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- water
- ground
- water level
- groundwater
- 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
- 230000035699 permeability Effects 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003673 groundwater Substances 0.000 claims abstract description 23
- 238000005086 pumping Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000011041 water permeability test Methods 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 2
- 239000000725 suspension Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 241000272525 Anas platyrhynchos Species 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/008—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by injection test; by analysing pressure variations in an injection or production test, e.g. for estimating the skin factor
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は土木建設工事に関連して行う地盤調査における
現場透水試験に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-site water permeability test in ground investigation performed in connection with civil engineering construction work.
也温Ａ＊ｆｌｉ＆方堪と１、ては、１本の井戸を掘り、
その井戸に対して揚水または注水して周辺の地下水位に
変化を４え、その１響を観測して透水係数を計算する単
孔式と、前記井戸の池に観測井戸を設ける多孔式とがあ
るが、本発明は単孔式に関するものである。Yaon A*fli & Hotan 1, Te dug a well,
There are two types: the single-hole method, in which water is pumped or injected into the well to cause changes in the groundwater level in the surrounding area, and the permeability coefficient is calculated by observing the effects, and the multi-hole method, in which an observation well is installed in the pond of the well. However, the present invention relates to a single hole type.
また従来の揚水式現場透水試験方法としては、一定装置
の揚水により地下水位が低下する状態をｌ１ＩＩｌｌシ
て整理する揚水法と、ある時間経過後揚水を中止して地
下水位が回復する状況を観測して整理する回復法とがあ
るが、従来の揚水にはいずれもポンプを使用していたた
め、地盤によっては、すなわち湧水量の特に大きい地盤
では、ポンプの性能上の制約から所望量の揚水ができな
いため透水試験が不可能になったり、またたとえ実施し
ても試験結果が非常に不正確になるという問題点がある
。In addition, conventional pumping-type in-situ water permeability test methods include the pumping method, in which the groundwater level drops due to pumping with a fixed device, and the other, in which the pumping is stopped after a certain period of time and the groundwater level recovers. However, because pumps have been used for conventional water pumping, depending on the ground, in particular ground where the amount of spring water is particularly large, it may be difficult to pump the desired amount of water due to pump performance constraints. This poses a problem in that water permeability tests are impossible, and even if they are carried out, the test results are extremely inaccurate.
本発明は上述の間朧点を解決するためなされたもので、
湧水量の大きい地ＩＩｋに対しても実施可能である上に
、従来のものと比較してより正確な試験結果が得られる
現場透水試験方法を提供することを目的とするものであ
る。The present invention was made to solve the above-mentioned problems, and
It is an object of the present invention to provide an on-site water permeability test method that can be carried out even in areas IIk with a large amount of spring water, and which can provide more accurate test results than conventional methods.
以下図面について本発明を説明する。図中／は逃水試験
を実施する地盤である。The invention will be explained below with reference to the drawings. / in the figure is the ground where the water escape test will be conducted.
本発明においては、地盤ｌ中に第１図に示すように、例
えば直径／ｍのケーシング内を所定の深度まで打ち込む
と共に、そのケーシング−の内部を掘削し、ついで第２
図に示すように、このケーシング２内の底部に揚水管３
の吸込口３ａを設置すると共に、ケーシング内の上端開
口部を蓋ｌにより密閉し、この密閉したケーシングλ内
に圧縮空気を送り込めるようにする。すなわちｊは蓋ダ
を貫通して設けた圧縮空気送給管で、ニアコンプレッサ
ー（図示せず）に接続しである。また６は揚、水管Ｊの
下端部に設けた水中ポンプで、これは揚水にポンプを併
用する場合に設ければよい。７はケーシングコ内の地下
水で、ｌはこの地下水７の水面を検知する電気式水位検
知器であり、その吊索ｒａに付した目盛り（図示せず）
により水位を測定する鴨のである。なおこの水位を検知
するには、第を図に示すような浮子式水位検知器を使用
して１よい。すなわち図中９は浮子、？ａはその吊り索
である。In the present invention, as shown in FIG. 1, a casing with a diameter of /m, for example, is driven into the ground to a predetermined depth, the inside of the casing is excavated, and then a second
As shown in the figure, a pumping pipe 3 is installed at the bottom of this casing 2.
A suction port 3a is installed, and the upper end opening in the casing is sealed with a lid l, so that compressed air can be sent into the sealed casing λ. That is, j is a compressed air supply pipe provided through the lid and connected to a near compressor (not shown). Reference numeral 6 denotes a submersible pump provided at the lower end of the water pipe J, which may be provided when a pump is also used for pumping water. 7 is groundwater inside the casing, l is an electric water level detector that detects the water level of this groundwater 7, and a scale (not shown) is attached to the suspension rope RA.
It is a duck that measures the water level. In order to detect this water level, it is sufficient to use a float type water level detector as shown in the figure. In other words, 9 in the figure is a float, ? a is the sling.
つぎに本発明は第３図に示すように、ニアコンプレッサ
ーを運転して、圧縮空気を送給管ｊより密閉したケーシ
ングコ内に送り込む。そしてケーシング−内の気圧が上
昇すれば、それに伴ってケーシングコ内の地下水が揚水
管Ｊを介して外部へ排出されるため、地下水７の水面は
次第に低下する。なおこの場合、水中ポンプ≦を併用し
て揚水してもよい。Next, in the present invention, as shown in FIG. 3, the near compressor is operated to send compressed air into the sealed casing via the feed pipe j. As the air pressure inside the casing increases, the groundwater inside the casing is discharged to the outside via the pumping pipe J, so that the water level of the groundwater 7 gradually decreases. In this case, a submersible pump≦ may also be used to pump water.
このようにして第参図に示すように、ケーシングコ内の
地下水をすべて揚水し、それを水位検知器ｌにより検知
したならば、第５図に示すように４１を取り外してケー
シングλ内の密閉を解除する。この場合、蓋ダを分割式
にしておけば・取り外すのが容易である。またケーシン
グ−内の密閉を解除する池の方法としては、ＩＩｉりを
取り外すことなく、あらかじめ開閉弁を有する大気連通
孔（図示せず）を設けておき、この開閉弁（図示せず）
を開くことによりケーシングコ内の圧力空気を絞出して
もよい。In this way, as shown in Figure 5, once all the groundwater inside the casing has been pumped up and detected by the water level detector l, remove 41 and seal the inside of the casing λ, as shown in Figure 5. Release. In this case, if the lid is split, it can be easily removed. In addition, as a method for releasing the seal inside the casing, an atmosphere communication hole (not shown) having an on-off valve is provided in advance without removing the IIi, and this on-off valve (not shown) is installed in advance.
The pressurized air inside the casing can be squeezed out by opening it.
このようにケーシングコ内の密閉を解除すれば、ケーシ
ング−内の気圧が大気圧まで低下するから、それに伴っ
て第５図の矢印で示すようにケーシング２内に地下水７
が侵入する。したがってその地下水７が平衡状態にもど
るまでの時間と水位の変化を水位検知器ｔを介して測定
することにより、その地盤の所定の深度における透水係
数を求めることができる。When the seal inside the casing 2 is released in this way, the pressure inside the casing drops to atmospheric pressure, and as a result, groundwater 7 flows into the casing 2 as shown by the arrow in Figure 5.
invades. Therefore, by measuring the time taken for the groundwater 7 to return to an equilibrium state and the change in water level using the water level detector t, the permeability coefficient of the ground at a predetermined depth can be determined.
本発明方法は上述のように、ケーシング内の揚水を密閉
したケーシング内に圧縮空気を圧入することにより行う
ようにしたから、従来揚水不可能であった地盤に対して
も揚水可能となり、しかもケーシングの最下部まで確実
に空にすることができる。したがってケーシング内の密
閉を解除した後の地下水のケーシング内への流入量も多
くなり、それだけ大きな水位の変化を測定することかで
きる。このため本発明方法によれば、従来のものよりは
るかに信籾性の高い試験結果が得られる。As mentioned above, in the method of the present invention, water is pumped inside the casing by injecting compressed air into the sealed casing. Therefore, it is possible to pump water even to the ground where it was previously impossible to pump water. can be reliably emptied to the bottom. Therefore, the amount of groundwater flowing into the casing after the seal inside the casing is released increases, and a correspondingly larger change in water level can be measured. Therefore, according to the method of the present invention, test results with far higher reliability than those of the conventional method can be obtained.
上述の通りであるから本発明は、現場透水試験の適用範
囲を着しく拡張すると共に、その試験結果の信頼性を向
上できるというすぐれた効果があるＯAs described above, the present invention has the excellent effect of significantly expanding the scope of application of on-site water permeability testing and improving the reliability of the test results.
第１図〜第！図は本発明試験方法の説明用縦断面図、第
４図は地下水位検知器の池の例を示す縦断面図である。
！・・パ地盤、コ・・・ケーシング、３・・・揚水管、
３ａ・・・吸込口、ダ・・・蓋、！・・・圧縮空気送給
管、乙・・・水中ポンプ、７・・・地下水、ｒ・・・電
気式水位検知・器、ｒａ・・・吊り索、９・・・浮子式
水位検知器の浮子、９ａ・・・吊り索。
第３図 第４図
第５図
第６図Figures 1 to 1! The figure is a longitudinal sectional view for explaining the test method of the present invention, and FIG. 4 is a longitudinal sectional view showing an example of a pond in a groundwater level detector. !・・・Pa ground, Co...Casing, 3...Histor pipe,
3a... Suction port, Da... Lid! ...compressed air supply pipe, B...submersible pump, 7...groundwater, r...electric water level detector/device, ra...suspension rope, 9...roat type water level detector Float, 9a...suspension rope. Figure 3 Figure 4 Figure 5 Figure 6
Claims (1)
込むと共に、そのケージジグ内部を掘削し、このケーシ
ング内の底部に揚水管の吸込口を設置すると共に、ケー
シングの上端開口部を密閉し、この密閉したケーシング
内に圧縮空気を送り込んでケーシング内の地下水を揚水
した後、ケーシング内の密閉を解除してケーシング内に
地下水を導入し、その地下水が平衡状態にもどるまでの
時間と水位の変化を測定して透水係数を求めることを特
徴とする現場透水試験方法。 ２ ケーシング内の揚水にポンプを併用する特許請求の
範囲第１項記載の現場透水試験方法っ[Claims] A casing is driven into L jtl1g to a predetermined depth, the inside of the cage jig is excavated, a suction port for a pumping pipe is installed at the bottom of this casing, and the upper end opening of the casing is sealed. After pumping the groundwater inside the casing by pumping compressed air into the sealed casing, the seal inside the casing is released and the groundwater is introduced into the casing, and the time and water level until the groundwater returns to an equilibrium state are determined. An on-site permeability test method that is characterized by determining the permeability coefficient by measuring changes. 2. The on-site water permeability test method according to claim 1, which uses a pump to pump water inside the casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14926281A JPS5850215A (en) | 1981-09-21 | 1981-09-21 | Permeability test at site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14926281A JPS5850215A (en) | 1981-09-21 | 1981-09-21 | Permeability test at site |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5850215A true JPS5850215A (en) | 1983-03-24 |
| JPS6149450B2 JPS6149450B2 (en) | 1986-10-29 |
Family
ID=15471395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14926281A Granted JPS5850215A (en) | 1981-09-21 | 1981-09-21 | Permeability test at site |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5850215A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61191712A (en) * | 1985-02-18 | 1986-08-26 | Taniguchi Chishitsu Chiyousa Jimusho:Kk | Method and device of performing in-place test for permeation of water |
| KR100382359B1 (en) * | 2000-12-27 | 2003-05-09 | 주식회사 이엔쓰리 | measuaring system for hydraulic conductivity |
| JP2009002951A (en) * | 2007-06-25 | 2009-01-08 | Korea Atomic Energy Research Inst | Water level recovery observation device |
| JP2016084586A (en) * | 2014-10-23 | 2016-05-19 | 前田建設工業株式会社 | Method for determining appropriate air feeding pressure to caisson work room in pneumatic caisson method |
-
1981
- 1981-09-21 JP JP14926281A patent/JPS5850215A/en active Granted
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61191712A (en) * | 1985-02-18 | 1986-08-26 | Taniguchi Chishitsu Chiyousa Jimusho:Kk | Method and device of performing in-place test for permeation of water |
| JPH0514043B2 (en) * | 1985-02-18 | 1993-02-24 | Taniguchi Chishitsu Chosa Kk | |
| KR100382359B1 (en) * | 2000-12-27 | 2003-05-09 | 주식회사 이엔쓰리 | measuaring system for hydraulic conductivity |
| JP2009002951A (en) * | 2007-06-25 | 2009-01-08 | Korea Atomic Energy Research Inst | Water level recovery observation device |
| JP4689702B2 (en) * | 2007-06-25 | 2011-05-25 | コリア アトミック エナジー リサーチ インスティチュート | Water level recovery observation device |
| JP2016084586A (en) * | 2014-10-23 | 2016-05-19 | 前田建設工業株式会社 | Method for determining appropriate air feeding pressure to caisson work room in pneumatic caisson method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6149450B2 (en) | 1986-10-29 |
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