JP2679235B2 - Soft ground reclamation method - Google Patents
Soft ground reclamation methodInfo
- Publication number
- JP2679235B2 JP2679235B2 JP8947089A JP8947089A JP2679235B2 JP 2679235 B2 JP2679235 B2 JP 2679235B2 JP 8947089 A JP8947089 A JP 8947089A JP 8947089 A JP8947089 A JP 8947089A JP 2679235 B2 JP2679235 B2 JP 2679235B2
- Authority
- JP
- Japan
- Prior art keywords
- embankment
- soft ground
- resistor
- geotextile
- soil
- 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
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、軟弱地盤埋立工法に関し、特にジオテキス
タイルのポストテンション工法に関する。TECHNICAL FIELD The present invention relates to a soft ground reclamation method, and more particularly to a geotextile post-tension method.
（従来の技術） 従来、軟弱地盤対策としては土を置き替える置換工
法、軟弱土を硬化させる地盤改良工法、地盤の支持力を
上げ、かつ排水を狙ったサンドパイル工法、古くはソダ
沈床を配置するなどの工法が知られている。いずれにし
ても軟弱地盤は水の中に土の粒子が浮いているような状
態でこの上に盛土をした場合盛土の形態が安定せず、軟
弱地盤の土の粒子が互に接触し余分な水を排除しながら
落ちつくまでに相当な時間がかかり最終沈下までに10年
から80年はかかると言われている。このため上記のよう
な軟弱地盤対策がとられたり最近はシート状のジオテキ
スタイルを敷設しシートの引張力で土層を分離し、また
上の盛土のすべり破壊を防止し早く盛土の形態を安定さ
せる方法がとられている。(Prior art) Conventionally, as a countermeasure against soft ground, a replacement method that replaces soil, a ground improvement method that hardens soft soil, a sand pile method that raises the bearing capacity of the ground and aims for drainage, old soda floor The construction method such as doing is known. In any case, when soft soil is filled with soil particles in the water and the embankment is placed on top of this, the shape of the embankment is not stable and soil particles on the soft soil contact each other to cause excess soil. It takes a considerable amount of time to settle down while eliminating water, and it is said that it will take 10 to 80 years until the final settlement. For this reason, the above soft ground countermeasures have been taken, and recently, sheet-like geotextiles have been laid and the soil layer is separated by the tensile force of the sheet, and the slippage of the upper embankment is prevented and the shape of the embankment is stabilized quickly. The method is taken.
（発明が解決しようとする課題） 上記のようなシート状ジオテキスタイルを敷設した場
合、盛土と軟弱地盤の分離、また盛土のすべり破壊が防
止されるが盛土によりジオテキスタイル上にかかった荷
重で、軟弱地盤は圧密沈下し全体に盛土が沈下しつづ
け、いつまでたっても形状が決まらないという問題があ
った。(Problems to be solved by the invention) When a sheet-like geotextile as described above is laid, separation of the embankment and soft ground and slip failure of the embankment are prevented, but the soft ground is affected by the load applied on the geotextile by the embankment. Had a problem that the shape of the soil could not be determined forever as the soil subsided and the embankment continued to subside.
本発明は、軟弱地盤対策でジオテキスタイルを敷設す
るに際し軟弱地盤の圧密沈下を防止しまたは遅らせ早く
盛土の利用ができるジオテキスタイルの敷設方法を提供
せんとするものである。The present invention is to provide a method for laying a geotextile which can prevent or delay consolidation settlement of the soft ground when laying the geotextile as a countermeasure against the soft ground and can use the embankment quickly.
（課題を解決するための手段） 即ち、本発明は、ジオテキスタイル敷設の工法で、盛
土自身の受働土圧に変換し支持することを特徴とする軟
弱地盤埋立工法である。ここでいうジオテキスタイルと
は繊維糸、繊維テープ、スリットフイルムから作られる
織物、編物、組物はもちろんスパンボンド法、ニードル
パンチ法、樹脂加工法、メルトブロー法なによる不織布
のほかこれらを樹脂加工したジオネット類または樹脂を
成型したプラスチックグリッド、またはフイルムまたは
樹脂をコーティングしたジオメンブレンなど土木に使わ
れるシート状物はいずれであってもよい。これらは前述
のように軟弱地盤対策として軟弱地盤の上に敷設し、シ
ートの引張力で上層を分離または盛土の滑り破壊の防止
の目的で使われているものである。(Means for Solving the Problem) That is, the present invention is a method for laying a geotextile, which is a soft ground reclamation method characterized by converting and supporting the passive earth pressure of the embankment itself. The geotextile here is not only woven fabrics, knitted fabrics and braids made from fiber yarns, fiber tapes and slit films, but also non-woven fabrics such as spunbond method, needle punching method, resin processing method and melt blow method, as well as geo-processed resin. Any of nets or plastic grids molded with resin, or sheet-like materials used for civil engineering such as films or resin-coated geomembranes may be used. As described above, these are laid on the soft ground as a measure against the soft ground, and are used for the purpose of separating the upper layer by the tensile force of the sheet or preventing slip failure of the embankment.
抵抗体とは、望ましくはコンクリート板であり、プラ
スチック板、金属板であってもよく形状も板状でなく内
側にわん曲したものであってもよいが、盛土荷重を盛土
自身の受働土圧を変換し支持できる形状と強度が必要で
大きさ、強度は計算された盛土の鉛直荷重の大きさに対
し必要な受働土圧の受けられるもので安全率としては２
倍あればよい。The resistor is preferably a concrete plate, and may be a plastic plate or a metal plate, and the shape may not be plate-like but curved inward, but the embankment load is the passive earth pressure of the embankment itself. The size and strength that can convert and support the required strength and strength are those that can receive the required passive earth pressure against the calculated vertical load of the embankment, and the safety factor is 2
It should be doubled.
ジオテキスタイルとの固定方法は抵抗体にロープで結
びつけても、ボルトで締めつけてもよいが、望ましくは
シートを抵抗体に巻きつけてしまうのが施工上簡単であ
る。抵抗体の定着方法は例えば第１図で盛土５の鉛直荷
重がかかる両側に抵抗体２を配し抵抗体２にジオテキス
タイル３を巻きつけて抵抗体２を軟弱地盤中に沈めジオ
テキスタイル３を軟弱地盤表面に敷設、仮定着する。抵
抗体２の仮定着後抵抗体２を固定し後工程の盛土で抵抗
体が移動しないよう抵抗体２の内側にプレ盛土４を行な
い抵抗体を定着後、盛土５を行なう。The method of fixing to the geotextile may be tied to the resistor with a rope or may be tightened with a bolt, but it is desirable to wind the sheet around the resistor for the purpose of construction. The method of fixing the resistor is, for example, in FIG. 1, placing the resistor 2 on both sides of the embankment 5 to which a vertical load is applied, winding the geotextile 3 around the resistor 2, submerging the resistor 2 in the soft ground, and softening the geotextile 3 in the soft ground. Lay it on the surface and put it on. After assuming that the resistor 2 has been attached, the resistor 2 is fixed, and the pre-embankment 4 is performed inside the resistor 2 so that the resistor does not move in the embankment in the subsequent step.
（作用） 本発明の構成によれば、盛土５の荷重がジオテキスタ
イル３にかかったとき、この鉛直荷重はジオテキスタイ
ル３に固定された抵抗体２で盛土５自身の受働土圧に変
換され盛土自身の荷重は軟弱地盤に直接かからず広く緩
和される。(Operation) According to the configuration of the present invention, when the load of the embankment 5 is applied to the geotextile 3, the vertical load is converted into the passive earth pressure of the embankment 5 itself by the resistor 2 fixed to the geotextile 3, and The load is not directly applied to the soft ground and is widely relaxed.
（実施例） 実施例 １ 人が立って沈む程度の軟弱地盤の地盤支持力はＮ値が
２であった。この上に4mの高さ盛土し上底6m、下底22m
の台形断面で6m幅の道路を施工することになった。(Example) Example 1 N value was 2 for the ground bearing capacity of the soft ground to the extent that one person stands and sinks. A 4m high embankment on top of this, 6m on the top and 22m on the bottom
It was decided to construct a 6m wide road with a trapezoidal cross section.
他方、高さ2m、長さ8m、厚み20cmのコンクリート板を
抵抗体として準備した。施工現場では、道路予定地を中
心線に沿って18m幅の両側へ抵抗体を埋めるため深さ1m
の堀さくを行ないジオテキスタイルを巻きつけた抵抗体
を1m立て込んでジオテキスタイルを敷設、抵抗体を仮定
着した。On the other hand, a concrete plate having a height of 2 m, a length of 8 m and a thickness of 20 cm was prepared as a resistor. At the construction site, a depth of 1m to fill the resistor with 18m width on both sides of the planned road along the center line.
I made a moat and built a geotextile with a resistor wrapped with geotextile for 1 m, and put on a hypothetical resistor.
この後抵抗体の内側へ抵抗体の上方50cmの高さまで上
底幅2m、傾斜1:2でプレ盛土を行なった。After this, pre-filling was performed inside the resistor up to a height of 50 cm above the resistor with an upper base width of 2 m and a slope of 1: 2.
これにより抵抗体を定着後高さ4mの盛土を行ない幅6m
勾配1:2の道路を施工した。As a result, after fixing the resistor, embankment with a height of 4m is performed and a width of 6m.
A road with a slope of 1: 2 was constructed.
施工後道路の沈下量を経時的に測量したが、通常ジオ
テキスタイルを敷設した同クラスの盛土では初年度の１
年で10mm程度の沈下がみられるが、本発明の工法では初
年度の１年で3mm程度でおさまった。After the construction, the subsidence of the road was measured over time, but in the embankment of the same class where normal geotextile was laid, it was 1 in the first year.
Although a subsidence of about 10 mm is seen annually, the construction method of the present invention subsided at about 3 mm in the first year of the first year.
（発明の効果） 軟弱地盤に盛土載荷したとき、ジオテキスタイル本来
の上層分離、すべり破壊防止の効果はもとより軟弱地盤
の圧密沈下を防止し早く盛土を安定させ上部の利用を早
くすることができた。(Effect of the invention) When embankment was loaded on soft ground, not only the original upper layer separation of geotextile and the prevention of slip fracture, but also consolidation settlement of soft ground was prevented, the embankment was stabilized quickly, and utilization of the upper part could be accelerated.
第１図は軟弱地盤埋立部の断面図である。 １……軟弱地盤、２……抵抗体 ３……ジオテキスタイル。 FIG. 1 is a sectional view of a soft ground reclamation part. 1 ... Soft ground, 2 ... Resistor 3 ... Geotextile.
Claims (1)
をあらかじめジオテキスタイルで固定した抵抗体で盛土
自身の受働土圧に変換し支持することを特徴とする軟弱
地盤埋立工法。1. A method of laying geotextiles, which comprises converting a load of embankment into a passive earth pressure of the embankment itself by a resistor fixed in advance by geotextiles and supporting the soft ground reclamation method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8947089A JP2679235B2 (en) | 1989-04-07 | 1989-04-07 | Soft ground reclamation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8947089A JP2679235B2 (en) | 1989-04-07 | 1989-04-07 | Soft ground reclamation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02269216A JPH02269216A (en) | 1990-11-02 |
| JP2679235B2 true JP2679235B2 (en) | 1997-11-19 |
Family
ID=13971605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8947089A Expired - Fee Related JP2679235B2 (en) | 1989-04-07 | 1989-04-07 | Soft ground reclamation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2679235B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19848846A1 (en) * | 1998-10-22 | 2000-04-27 | Huesker Synthetic Gmbh & Co | Foundation structure for constructions on soft ground has pillars at regular intervals through into the lower hard ground layer with pillar head caps covered by a geo-plastics reinforcement to take the loose ballast |
| JP4002428B2 (en) * | 2001-12-03 | 2007-10-31 | 新日石プラスト株式会社 | Geotextile used for block paving |
| DE102009011119B4 (en) * | 2009-03-03 | 2013-12-19 | Huesker Synthetic Gmbh | Method for stabilizing a dam or dump on a soft ground and embankment or heap prepared by this method |
-
1989
- 1989-04-07 JP JP8947089A patent/JP2679235B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02269216A (en) | 1990-11-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080801 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |