JP6267883B2 - Water shielding method for measuring pore water pressure acting on slip surface - Google Patents
Water shielding method for measuring pore water pressure acting on slip surface Download PDFInfo
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- JP6267883B2 JP6267883B2 JP2013143113A JP2013143113A JP6267883B2 JP 6267883 B2 JP6267883 B2 JP 6267883B2 JP 2013143113 A JP2013143113 A JP 2013143113A JP 2013143113 A JP2013143113 A JP 2013143113A JP 6267883 B2 JP6267883 B2 JP 6267883B2
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 32
- 238000000034 method Methods 0.000 title claims description 18
- 239000011148 porous material Substances 0.000 title claims description 14
- 239000004568 cement Substances 0.000 claims description 11
- 229920003002 synthetic resin Polymers 0.000 claims description 8
- 239000000057 synthetic resin Substances 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 6
- 239000008267 milk Substances 0.000 claims description 4
- 210000004080 milk Anatomy 0.000 claims description 4
- 235000013336 milk Nutrition 0.000 claims description 4
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 239000003673 groundwater Substances 0.000 description 8
- 238000009412 basement excavation Methods 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 4
- 101150036892 VP40 gene Proteins 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Images
Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
本発明は、地すべり現場でのすべり面に作用する間隙水圧を測定するための遮水方法に関する。 The present invention relates to a water shielding method for measuring pore water pressure acting on a slip surface at a landslide site.
従来、地すべり現場での重要な調査の一つにすべり面付近における間隙水圧測定用の水位観測孔の設置である。すべり面に作用する間隙水圧を測定するためには遮水ゾーンの形成が最も重要である。一般的には測定深度の上部をベントナイトや粘土など非透水性の充填物で埋め戻し、測定するべき地下水と他の地下水との遮断を行っているが、確実な遮水ゾーンの形成は狭いボーリング孔内が対象であること、且つ形成過程において充填の良否の確認も出来ないため容易な作業とはいえない。
そこで、地下水位観測孔の設置方法として、（１）水位を観測しようとする深度の直前までケーシングでボーリングを行い、（２）作業完了後、掘削孔内全体にセメントミルクを充填し、（３）セメントを３日間程度養生し、完全に固結する前にそのセメント柱をボーリングでくり抜いて目標深度まで掘進し、観測孔を形成し、（４）孔内に最深部をストレーナ区間としてＶＰ４０を挿入する、ことが行われている（非特許文献１を参照）。
Conventionally, one of the important investigations at the landslide site is the installation of a water level observation hole for pore water pressure measurement near the slip surface. In order to measure the pore water pressure acting on the slip surface, the formation of the impermeable zone is the most important. In general, the upper part of the measurement depth is backfilled with non-permeable fillers such as bentonite and clay, and the groundwater to be measured is shut off from other groundwaters. Since the inside of the hole is an object and the quality of filling cannot be confirmed in the formation process, it cannot be said that it is an easy operation.
Therefore, as a method for installing the groundwater level observation hole, (1) boring with the casing until just before the depth at which the water level is to be observed, (2) after completion of the work, filling the entire borehole with cement milk, (3 ) Cement is cured for about 3 days, and before it is completely consolidated, the cement pillar is bored by boring and drilled to the target depth to form an observation hole. Insertion is performed (see Non-Patent Document 1).
前述の地下水位観測孔の設置方法は、ボーリング延長が短く、垂直性を保つことが可能であったためセメント柱を作って遮水したが、ボーリング深度が大きくなると、掘削地層にもよるが孔曲がりを起こし、セメント柱の外壁をボーリング先端が突き破ることが考えられた。
本発明は、ボーリング深度の大きい掘削孔に適用できる、すべり面も含めて目的とする区間に作用する間隙水圧を測定するための遮水方法である。
The above-mentioned groundwater level observation hole was installed with a cement pillar because of its short boring extension and the ability to maintain verticality. However, when the drilling depth increases, the hole bends depending on the drilling formation. It was thought that the boring tip broke through the outer wall of the cement pillar.
The present invention is a water shielding method for measuring pore water pressure acting on a target section including a slip surface, which can be applied to an excavation hole having a large bore depth.
本発明は、地すべり現場でのすべり面に作用する間隙水圧を測定するための遮水方法を提供することを目的とする。 An object of the present invention is to provide a water shielding method for measuring pore water pressure acting on a slip surface at a landslide site.
本発明のすべり面に作用する間隙水圧を測定するための遮水方法は、次の（ａ）〜（ｅ）の手順に従って行われる。
（ａ）掘削機によりケーシングで保孔しながらすべり面深度より１〜２ｍ浅く掘削する。
（ｂ）掘削孔内にセメントミルクを充填し、孔底より所定の厚さで掘削孔底部にセメンテーション部を形成する。
（ｃ）セメントを養生し、完全に固結する前又は固結した後に掘削機でセメンテーション部及びすべり面深度より１〜２ｍ深く掘削する。
（ｄ）すべり面より下の区間のみストレーナ加工した合成樹脂パイプを地上からセメンテーション部を通して挿入する。
（ｅ）孔口止めを実施し、合成樹脂パイプ内にロープ、ワイヤー、チェーン等の索条を介して水位計をすべり面付近に設置する。
The water shielding method for measuring the pore water pressure acting on the sliding surface of the present invention is performed according to the following procedures (a) to (e).
(A) Excavate 1 to 2 m shallower than the sliding surface depth while keeping holes in the casing with an excavator.
(B) filling the cement milk drilling hole, to form a cementation unit in the borehole bottom at a predetermined thickness from the bottom of the hole.
(C) Cement is cured and excavated by 1 to 2 m deeper than the cementation part and the sliding surface depth with an excavator before or after solidification.
(D) A synthetic resin pipe strained only in the section below the slip surface is inserted from the ground through the cementation section .
(E) The hole mouth stopper is implemented, and a water level gauge is installed in the vicinity of the slip surface in the synthetic resin pipe via a rope, a wire, a chain or the like.
本発明のすべり面に作用する間隙水圧を測定するための遮水方法は、掘削孔のケーシングで周囲からの地下水の浸入を防止し、掘削孔底部のセメンテーションにより地下水の浸入を完全に防止し、すべり面付近に水位計を設置してすべり面の水位を測定できるため、すべり面に作用する間隙水圧を確実に測定することができる効果がある。 The water shielding method for measuring the pore water pressure acting on the sliding surface of the present invention prevents the intrusion of groundwater from the surroundings by the casing of the drilling hole, and completely prevents the intrusion of groundwater by cementation at the bottom of the drilling hole. Since a water level meter is installed in the vicinity of the slip surface and the water level on the slip surface can be measured, the pore water pressure acting on the slip surface can be reliably measured.
本発明のすべり面に作用する間隙水圧を測定するための遮水方法の一実施例を添付図面に基づいて、以下に説明する。
図１（ａ）〜（ｅ）の説明図に示すように、本発明のすべり面に作用する間隙水圧を測定するための遮水方法は、次の（ａ）〜（ｅ）の手順に従って行われる。
（ａ）ダウンザホールハンマ工法でφ３００ｍｍ程度の掘削機によりケーシング１で保孔しながらすべり面深度より１〜２ｍ浅く掘削する。
ダウンザホールハンマ工法は、エアコンプレッサーから供給される圧搾空気によりハンマ先端のビットを作動させて地層を打撃掘削すると同時に、ビットの先端部から排出する空気で掘削土を地上へ排除する工法である。掘削とケーシングの挿入を同時に行うことができ、前記ケーシング１は地上で溶接して継ぎ足す。
前記ケーシング１は、φ３００ｍｍ程度のガス管である。
One embodiment of a water shielding method for measuring pore water pressure acting on a sliding surface of the present invention will be described below with reference to the accompanying drawings.
As shown in the explanatory diagrams of FIGS. 1A to 1E, the water shielding method for measuring the pore water pressure acting on the sliding surface of the present invention is performed according to the following procedures (a) to (e). Is called.
(A) Excavate 1 to 2 m shallower than the sliding surface depth while retaining holes in the
The down-the-hole hammer method is a method in which a bit at the tip of a hammer is operated by compressed air supplied from an air compressor to strike and excavate the formation, and at the same time, excavated soil is removed to the ground with air discharged from the tip of the bit. The excavation and the insertion of the casing can be performed at the same time, and the
The
（ｂ）掘削孔内にセメントミルクを充填し、孔底より適宜の厚さ、例えば５ｍの厚さで掘削孔底部にセメンテーション部２を形成する。その際、前記ケーシング１はそのままの状態か又は数ｍ、例えば４ｍ引き上げる。
(B) Cement milk is filled in the excavation hole, and the cementation portion 2 is formed at the bottom of the excavation hole with an appropriate thickness from the hole bottom, for example, 5 m. At that time, the
（ｃ）セメントを養生し、完全に固結する前又は固結した後にφ６６ｍｍの掘削機でセメンテーション部２及びすべり面深度より１〜２ｍ深く掘削する。 (C) Cement is cured and excavated by 1 to 2 m deeper than the cementation part 2 and the sliding surface depth by a 66 mm excavator before or after solidifying completely.
（ｄ）すべり面より下の区間のみストレーナ加工した合成樹脂パイプ３を地上からセメンテーション部２を通して挿入する。前記合成樹脂パイプ３は、ＶＰ４０（塩化ビニールパイプ、ＶＰ４０ミリ（肉厚管）、長さ１〜４ｍ）である。
(D) The
（ｅ）地上の掘削開口に孔口止め４を実施し、前記合成樹脂パイプ３内にロープ、ワイヤー、チェーン等の索条を介して水位計５をすべり面付近に設置する。
(E) A hole stopper 4 is implemented in the excavation opening on the ground, and a water level gauge 5 is installed in the
このようにして、掘削孔の前記ケーシング１で周囲からの地下水の浸入を防止し、掘削孔底部のセメンテーション部２により地下水の浸入を完全に防止し、すべり面付近に水位計を設置してすべり面に作用する間隙水圧を確実に測定することができる。
In this way, the
１ ケーシング
２ セメンテーション部
３ 合成樹脂パイプ
４ 孔口止め
５ 水位計
DESCRIPTION OF
Claims (1)
（ａ）掘削機によりケーシングで保孔しながらすべり面深度より１〜２ｍ浅く掘削する。
（ｂ）掘削孔内にセメントミルクを充填し、孔底より所定の厚さで掘削孔底部にセメンテーション部を形成する。
（ｃ）セメントを養生し、完全に固結する前又は固結した後に掘削機でセメンテーション部及びすべり面深度より１〜２ｍ深く掘削する。
（ｄ）すべり面より下の区間のみストレーナ加工した合成樹脂パイプを地上からセメンテーション部を通して挿入する。
（ｅ）孔口止めを実施し、合成樹脂パイプ内にワイヤーを介して水位計をすべり面より下の区間に設置する。 A water shielding method for measuring pore water pressure acting on a target section including a slip surface, which is performed according to the following procedures (a) to (e).
(A) Excavate 1 to 2 m shallower than the sliding surface depth while keeping holes in the casing with an excavator.
(B) filling the cement milk drilling hole, to form a cementation unit in the borehole bottom at a predetermined thickness from the bottom of the hole.
(C) Cement is cured and excavated by 1 to 2 m deeper than the cementation part and the sliding surface depth with an excavator before or after solidification.
(D) A synthetic resin pipe strained only in the section below the slip surface is inserted from the ground through the cementation section .
(E) A hole stopper is implemented, and a water level gauge is installed in a section below the slip surface through a wire in the synthetic resin pipe.
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| JP2013143113A JP6267883B2 (en) | 2013-07-08 | 2013-07-08 | Water shielding method for measuring pore water pressure acting on slip surface |
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| JP2013143113A JP6267883B2 (en) | 2013-07-08 | 2013-07-08 | Water shielding method for measuring pore water pressure acting on slip surface |
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| JP6267883B2 true JP6267883B2 (en) | 2018-01-24 |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5976626U (en) * | 1982-11-15 | 1984-05-24 | 株式会社日さく | Groundwater pore water pressure/water level synchronization system observation device |
| JPH0610335A (en) * | 1992-06-23 | 1994-01-18 | Tokyo Gas Co Ltd | Method and device for detecting liquefaction of ground |
| JP3160186B2 (en) * | 1995-07-10 | 2001-04-23 | 核燃料サイクル開発機構 | Hydraulic test equipment with simultaneous front and side monitoring borehole television |
| JP3550026B2 (en) * | 1998-08-21 | 2004-08-04 | 信男 中山 | Water blocking device for boring hole and water blocking method using the same |
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