KR20020014619A - The construction method of landfill in soft soil using the horeizontal expansion pile - Google Patents
The construction method of landfill in soft soil using the horeizontal expansion pile Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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Abstract
Description
현재 국내외 해안, 늪지같은 연약지반에 조성되는 폐기물매립장은 하부지반의 저투수능을 인하여 침출수의 누출 및 확산의 저감효과등 여러장점을 가지고 있어 선호되고 있다. 그리고, 차수층으로 점토라이너, 벤토나이트 라이너, 지오멤브레인등을 사용하며, 이에 관한 기술 개발이 주를 이루어왔다.Currently, landfills in soft ground such as coastal and swamps at home and abroad have many advantages, such as leachate leakage and diffusion, due to the low permeability of the lower ground. In addition, clay liner, bentonite liner, geomembrane, etc. are used as the order layer, and the technical development has been focused on this.
연약지반에 조성되는 폐기물매립장은 폐기물매립시 발생하는 하중에대한 연약층의 지내력(침하, 강도) 부족으로 차수층의 균열 및 파괴, 침출수처리시스템의기능저하 및 파괴, 제방의 균열 및 파괴등이 발생한다. 따라서, 하부연약지반에 대한 대책이 이루어지지 않는다면 어떠한 차수층이라도 무용지물이 될 것이다. 본 발명에서는 하부지반의 지내력을 향상시키고 부가적으로 하부지반의 증가된 저투수능을 이용하여 차수층으로서 효과를 발휘하도록 하는 시스템을 주과제로 하였다.Waste landfills in the soft ground cause cracking and destruction of the order layer, deterioration and destruction of the leachate treatment system, and cracking and destruction of the embankment due to the lack of bearing capacity (settlement and strength) of the soft layer against the loads generated during the reclamation. . Therefore, if no countermeasure is taken against the lower soft ground, any order layer will be useless. In the present invention, a system for improving the bearing capacity of the lower ground and additionally using the increased low water permeability of the lower ground as an order layer has been the main subject.
도 1은 일반적인 기존의 연약지반에서의 폐기물 매립장 표준도1 is a standard view of a landfill site in a conventional conventional soft ground
도 2는 수평팽창압밀말뚝이 적용된 페기물 매립장 표준도2 is a standard drawing of the landfill site to which the horizontal expansion compaction pile is applied
도 3은 국내 기존 폐기물 매립장 단면도3 is domestic existing Waste landfill section
도 4는 본 발명을 이용한 폐기물 매립장 단면도Figure 4 is a cross-sectional view of the waste landfill site using the present invention
연약지반에 형성된 말뚝이 흙입자사이의 물과 반응하여 팽창하고 이팽창력이 지반을 수평압밀하여 지반을 개량함으로 연약지반에 발생하는 응력을 충분히 지지할 수 있는 지내력(침하 및 강도)을 가질수 있도록 하며, 부가적으로 차수능이 뛰어난 층을 형성하는 시스템.The pile formed on the soft ground reacts with the water between the soil particles and expands, and this expansion force improves the ground by horizontally consolidating the ground so that it can have a bearing capacity (settlement and strength) that can sufficiently support the stress generated in the soft ground. In addition, a system that forms a high-order layer.
일반적인 연약지반에 폐기물매립장을 조성할 경우 연약지반의 지내력(침하, 강도) 부족으로 발생할 수 있는 여러 문제점들과 본발명이 해결하고자 하는 과제들을 살펴보기위해 우리나라 서해안과 남해안에 산재한 해성점토층 지역에 매립장을 조성하는 것을 예로하여 보았다.In the case of constructing a waste landfill in general soft ground, the landfill site is located in the marine clay layer areas scattered on the west coast and south coast of Korea in order to examine the problems that can occur due to the lack of durability (subsidence and strength) of the soft ground and the problems to be solved by the present invention. It was taken as an example of the composition.
[도1]의 단면도는 국내 기존 매립장의 단면도로 하부지반에 형성된 사질 및 암반선은 일반적으로 지질조사시 얻어지는 경우를 가정하였으며, 적용된 지반관련 특성치는 남해안 지역의 점토를 KS시험규정에 의거해서 시험한 결과들이다.1 is a cross-sectional view of domestic existing Sand and rock formations formed in the lower ground as a cross-sectional view of the landfill are assumed to be generally obtained during geological survey. These are the results of testing local clay in accordance with KS test regulations.
*압밀침하량의 계산* Calculation of consolidation settlement
연약지반에 재하로 인하여 일어날 수 있는 침하는 즉시침하와 압밀침하이며 압밀침하는 1차압밀침하와 2차압밀침하로 나누어진다.Sedimentation that can occur due to loading on the soft ground is divided into immediate settlement and consolidation settlement, and consolidation settlement is divided into primary consolidation and secondary consolidation settlement.
전체침하량 = 즉시침하+압밀침하(1차압밀침하+2차압밀침하)Total Settlement = Immediate Settlement + Consolidation Settlement (First Consolidation Settlement + Secondary Consolidation Settlement)
·A 지점의 1차압밀침하량Primary consolidation settlement at point A
·B 지점의 1차압밀침하량Primary consolidation settlement at point B
∴ A지점과 B지점 침하량 차이 = 1.708m-1.197m = 0.511m차이 Difference between settlements of point A and B = 1.708m-1.197m = 0.511m
·C 지점의 침하량Settlement amount at point C
연약점성토지반에서 응력증가시 발생하는 침하에서 하중재하 즉시 발생하는 즉시침하는 압밀침하에 비하여 무시할 수 있을 정도로 작으므로 전침하량 계산에서는 제외하고, 정규압밀점토의 경우 2차압밀침하량은 무시할 수 없으므로 상기 1차침하량 산정결과에 합산한다면 A지점과 B지점사이의 전체침하량의 차이(부등침하량)는 50cm이상일 것이며, C지점의 전체침하량은 약 190cm이상일 것이다.In settlements that occur during stress increase in soft viscous soils, the immediate settlement that occurs immediately after loading is negligible compared to the consolidation settlement, so the second consolidation settlement cannot be neglected in the case of normal consolidation clays. The sum of the primary settlement estimates would be greater than 50 cm and the total settlement between site A and B would be greater than about 190 cm.
따라서, 산정된 부등 및 과침하량으로 인하여 차수층 및 침출수 배수시스템에 발생가능한 문제점을 살펴보면 다음과 같다.Therefore, the problems that may occur in the ordered layer and the leachate drainage system due to the calculated inequality and oversedimentation amount are as follows.
① A지점과 B지점사이 : 과부등침하 발생 →차수층의 파괴, 침출수 배수관로의 파괴, 침출수의 누출, 과잉간극수압의 분출 →침출수 배수시스템 기능 무용화, 주변지반 및 지하수 오염, 제방의 붕괴등① Between Points A and B: Overload subsidence occurs → Destroys the sediment layer, breaks the leachate drainage pipe, leaks the leachate, and releases the excess pore water pressure → Disables the leachate drainage system function, pollutes the surrounding ground and groundwater, collapses the dike, etc.
② C지점 : 과부등침하 발생 →차수층의 균열 및 파괴, 침출수 배수관로의기능저하 및 파괴, 침출수의 누출, 과잉간극수압의 분출 →침출수 배수시스템 기능 무용화, 주변지반 및 지하수 오염, 제방의 붕괴등② Point C: Overset subsidence → Cracking and destruction of the sediment layer, deterioration and destruction of the leachate drainage pipes, leakage of leachate, effusion of excess pore water pressure → Disable leachate drainage system function, pollution of surrounding ground and groundwater, collapse of dike Etc
③ 하부지반 전지점 : 부등침하발생 →차수층의 균열, 역구배형성에 의한 침출수 배수관로의 기능저하 →침출수 배수시스템 기능 무용화③ Bottom ground point: Inequality settlement → Deterioration of leachate drainage pipe due to crack of order layer and formation of reverse gradient → Function of leachate drainage system
본 발명 즉 [도2]와 같이 수평팽창압밀말뚝에 의해 조성된 폐기물매립장은The waste landfill site formed by the horizontal expansion compaction pile as shown in FIG.
[도2][Figure 2]
① 선행압밀효과 : 수평팽창압밀말뚝에서 발생하는 수평압(약 5t/m2)은 폐기물매립고 약 5m의 매립시의 하중효과를 가져와 선행압밀시키다. 그리고, 말뚝 주재료의 수화발열반응(약300℃)은 주변지반의 간극수를 감소시킴으로 지하수위가 하강되고, 지하수위 하강은 응력증가효과를 나타냄으로 하부지반을 선행압밀 시킨다.① preconsolidation effect: a horizontal pressure generated in the horizontal expansion consolidation pile (about 5t / m 2) gets the loading effect at the time of waste disposal and reclamation of about 5m train compaction prior. In addition, the hydration heating reaction (about 300 ℃) of the pile main material reduces the groundwater level by reducing the pore water of the surrounding ground, and the groundwater level lowering pre-consolidates the lower ground due to the stress increase effect.
② 과잉간극수 감소 : 선행압밀효과에 의해 폐기물매립 약 5m까지 과잉간극수압 및 침하는 발생하지 않고, 폐기물을 5m이상 매립시에도 수화발열반응에서 감소된 간극수의 효과에 의해 과잉간극수가 저감된다.② Reduction of excess pore water: The excess pore water pressure and settlement does not occur up to about 5m of waste landfill by the prior consolidation effect, and the excess pore water is reduced by the effect of reduced pore water in the hydration exothermic reaction even when the waste is buried more than 5m.
③ 지내력증가 효과 : 지반에 형성된 말뚝은 상부하중을 지반보다 큰 부담으로 지지하여(arching 효과) 하중경감 효과를 가져오고, 선행압밀된 지반에 의한 강도 증가, 말뚝재료의 이온전환효과에 의한 강도증가는 하부지반의 지내력을 향상시킨다.③ Increased bearing capacity: The pile formed on the ground supports the upper load with a greater burden than the ground (arching effect), resulting in a load reducing effect, increasing the strength by the preconsolidated ground, and increasing the strength by the ion conversion effect of the pile material. Improves the bearing capacity of the lower ground.
④부등침하량의 감소 : 선행압밀에 의해 침하량을 감소시킴으로 부등침하량을 감소시키고, 연약층의 심도에 비례하여 파일길이를 길게 시공하면 선행압밀량은 파일길이에 비례하여 크지므로 부등침하량이 감소된다. 그리고, 지내력 증가 효과는 전침하량을 감소시킴으로 부등침하량이 감소한다.④ Decrease inequality: The amount of inequality is reduced by reducing the amount of settlement by the advance consolidation. If the pile length is increased in proportion to the depth of the soft layer, the amount of inequality is reduced in proportion to the pile length. In addition, the increase in bearing capacity decreases the amount of precipitation, thereby reducing the amount of inequality.
⑤ 경제적인 폐기물 매립장 : 과잉간극수압의 감소, 지내력의 증가, 전침하량·부등침하량의 감소로 구조적으로 안정된 폐기물매립장을 연약지반에 조성할 수 있으며, [도3]과 같은 국내 폐기물매립장 단면을 본 발명의 단면인 [도4]로 변경할 경우, 고화층, 부직포, 과잉간극수 배수층을 수평팽창압밀말뚝만으로 대체하는 효과가 발생하여 공기 및 공사비면에 크게 유리하다.⑤ Economic waste landfill: A structurally stable waste landfill can be built on the soft ground by reducing the excess pore water pressure, increasing the bearing capacity, and reducing the amount of presedimentation and inequality. When changing the landfill cross section to [4], which is a cross section of the present invention, the effect of replacing the solidified layer, the nonwoven fabric, and the excess pore drainage layer with only the horizontal expansion compaction pile is greatly advantageous in terms of air and construction cost.
[도3] [도4][Figure 3] [Figure 4]
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022255988A1 (en) * | 2021-06-01 | 2022-12-08 | Halliburton Energy Services, Inc. | Expanding metal used in forming support structures |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59173414A (en) * | 1983-03-18 | 1984-10-01 | Onoda Cement Co Ltd | Improvement work of soft ground |
| JPS6121220A (en) * | 1984-07-10 | 1986-01-29 | Nishimatsu Kensetsu Kk | Improving method of ground |
| JPS6145020A (en) * | 1984-08-06 | 1986-03-04 | Nippon Steel Corp | Construction of steel water stop wall |
| JPH02252811A (en) * | 1989-03-27 | 1990-10-11 | Central Res Inst Of Electric Power Ind | Weak ground improvement method |
| JPH0726547A (en) * | 1993-07-15 | 1995-01-27 | Nakatomi Kurimoto | Improvement work for weak ground |
| JPH10102790A (en) * | 1996-10-02 | 1998-04-21 | Nippon Sogo Bosui Kk | Repairing method of periphery of concrete structure |
| KR20000002592U (en) * | 1998-07-09 | 2000-02-07 | 이용빈 | Water-expandable watertight rubber index material |
-
2000
- 2000-08-18 KR KR1020000048002A patent/KR20020014619A/en not_active Application Discontinuation
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59173414A (en) * | 1983-03-18 | 1984-10-01 | Onoda Cement Co Ltd | Improvement work of soft ground |
| JPS6121220A (en) * | 1984-07-10 | 1986-01-29 | Nishimatsu Kensetsu Kk | Improving method of ground |
| JPS6145020A (en) * | 1984-08-06 | 1986-03-04 | Nippon Steel Corp | Construction of steel water stop wall |
| JPH02252811A (en) * | 1989-03-27 | 1990-10-11 | Central Res Inst Of Electric Power Ind | Weak ground improvement method |
| JPH0726547A (en) * | 1993-07-15 | 1995-01-27 | Nakatomi Kurimoto | Improvement work for weak ground |
| JPH10102790A (en) * | 1996-10-02 | 1998-04-21 | Nippon Sogo Bosui Kk | Repairing method of periphery of concrete structure |
| KR20000002592U (en) * | 1998-07-09 | 2000-02-07 | 이용빈 | Water-expandable watertight rubber index material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022255988A1 (en) * | 2021-06-01 | 2022-12-08 | Halliburton Energy Services, Inc. | Expanding metal used in forming support structures |
| US11697915B2 (en) | 2021-06-01 | 2023-07-11 | Halliburton Energy Services, Inc. | Expanding metal used in forming support structures |
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